this was made by 2 homos
Many of the plants seen in Canada are introduced, either intentionally or accidentally. N indicated native and X indicated exotic. Those plants whose status is unknown are marked with a ?.

A | B | C | D | E | F | G | H | I J K | L | M | N | O | P Q | R | S | T | U V W | X Y Z

Ab

• Abies
  Fir
  Firs are a genus of 48–55 species of evergreen conifers in the family Pinaceae. They are found through much of North and Central America, Europe, Asia, and North Africa, occurring in mountains over most of the range...
  
  
  • N Abies amabilis
    Pacific Silver Fir
    Abies amabilis, commonly known as the Pacific silver fir, is a fir native to the Pacific Northwest of North America, occurring in the Pacific Coast Ranges and the Cascade Range from the extreme southeast of Alaska, through western British Columbia, Washington and Oregon, to the extreme northwest of...
    
     — Pacific silver fir, amabilis fir
  • N Abies balsamea
    Balsam Fir
    The balsam fir is a North American fir, native to most of eastern and central Canada and the northeastern United States .-Growth:It is a small to medium-size evergreen tree typically tall, rarely to tall, with a narrow conic crown...
    
     — balsam fir
  • N Abies grandis
    Grand Fir
    Abies grandis is a fir native to the Pacific Northwest and Northern California of North America, occurring at altitudes of sea level to 1,800 m...
    
     — grand fir
  • N Abies lasiocarpa
    Subalpine Fir
    The Subalpine Fir or Rocky Mountain Fir is a western North American fir, native to the mountains of Yukon, British Columbia and western Alberta in Canada; southeastern Alaska, Washington, Oregon, Idaho, western Montana, Wyoming, Utah, Colorado, New Mexico, Arizona, northeastern Nevada, and the...
    
     — subalpine fir

• Abutilon
  Abutilon
  Abutilon is a large genus of approximately 150 species of broadleaf evergreens in the mallow family, Malvaceae. The genus includes annuals, perennials, shrubs, and small trees from 1–10 m tall, and is found in the tropical and subtropical regions of all continents. The leaves are alternate,...
  
  
  • X Abutilon theophrasti
    Abutilon theophrasti
    Abutilon theophrasti is an annual plant in the family Malvaceae, native to southern Asia. It grows to 1 m tall, and has velvet-like heart-shaped leaves 15–25 cm broad...
    
     — velvetleaf, butterprint, Indian mallow

Ac

• Acalypha
  Acalypha
  Acalypha is a plant genus of the family Euphorbiaceae. It is the sole genus of the subtribe Acalyphinae. With 450 to 500 species of herbs and shrubs, the genus is only behind Euphorbia, Croton and Phyllanthus in term of Malpighiales diversity...
  
  
  • N Acalypha virginica — Virginia copperleaf, Virginia threeseed mercury

• Acanthospermum
  Acanthospermum
  Acanthospermum is a genus of plants in the family Asteraceae, also known as Starburrs or Starburs....
  
  
  • X Acanthospermum hispidum
    Acanthospermum hispidum
    Acanthospermum hispidum is an annual plant in the family Asteraceae, which is native to Central and South America. This plant is cited as a weed in cotton culture in Brazil, and it is also used as a medicinal plant.-External links:** photos...
    
     — hispid greenstripe

• Acer
  Maple
  Acer is a genus of trees or shrubs commonly known as maple.Maples are variously classified in a family of their own, the Aceraceae, or together with the Hippocastanaceae included in the family Sapindaceae. Modern classifications, including the Angiosperm Phylogeny Group system, favour inclusion in...
  
  
  • X Acer campestre — hedge maple, field maple
  • X Acer ginnala — Amur maple, ginnala maple
  • N Acer negundo — Manitoba maple, box-elder, ashleaf maple
  • N Acer nigrum
    Black Maple
    Acer nigrum is a species of maple closely related to A. saccharum , and treated as a subspecies of it by some authors, as Acer saccharum subsp. nigrum....
    
     — black maple, black sugar maple, rock maple
  • N Acer pensylvanicum
    Striped Maple
    Acer pensylvanicum is a species of maple native to northern and montane forests in eastern North America from southern Ontario east to Nova Scotia and south to Wisconsin, Ohio, and New Jersey, and also at higher elevations in the Appalachian Mountains south to northern Georgia.It is a small...
    
     — striped maple, moose maple, goosefoot maple
  • X Acer platanoides — Norway maple, Schwedler maple, crimson king maple
  • X Acer pseudoplatanus — sycamore maple, Scottish maple, great maple
  • N Acer rubrum
    Red Maple
    Acer rubrum , is one of the most common and widespread deciduous trees of eastern North America. It ranges from the Lake of the Woods on the border between Ontario and Minnesota, east to Newfoundland, south to near Miami, Florida, and southwest to east Texas...
    
     — red maple, swamp maple, scarlet maple
  • N Acer saccharinum
    Silver Maple
    The silver maple —also called creek maple, river maple, silverleaf maple, soft maple, water maple, or white maple—is a species of maple native to eastern North America in the eastern United States and Canada...
    
     — silver maple, soft maple, white maple, silverleaf maple, river maple
  • N Acer saccharum
    Sugar Maple
    Acer saccharum is a species of maple native to the hardwood forests of northeastern North America, from Nova Scotia west to southern Ontario, and south to Georgia and Texas...
    
     — sugar maple, hard maple
  • N Acer spicatum
    Mountain Maple
    Acer spicatum is a species of maple native to northeastern North America from Saskatchewan to Newfoundland, and south to Pennsylvania. It also grows at high elevations in the southern Appalachian Mountains to northern Georgia....
    
     — mountain maple
  • N Acer × freemanii (A. rubrum × A. saccharinum) — Freeman's maple

• Achillea
  Achillea
  Achillea is a genus of about 85 flowering plants, in the family Asteraceae, commonly referred to as yarrow. They occur in Europe and temperate areas of Asia. A few grow in North America. These plants typically have frilly, hairy, aromatic leaves....
  
  
  • X Achillea filipendulina
    Achillea filipendulina
    Achillea filipendulina is an ornamental plant in the Asteraceae family.This plant grows high, and the foliage, though fern-like, has an untidy appearance, from the irregular way in which it is disposed. It is herbaceous, and comes from the Caucasus...
    
     — fernleaf yarrow
  • N Achillea millefolium subsp. borealis — northern yarrow
  • N Achillea millefolium subsp. lanulosa — woolly yarrow
  • X Achillea millefolium subsp. millefolium — common yarrow, milfoil
  • X Achillea ptarmica — false sneezewort, white tansy, sneezewort yarrow, pearl yarrow
  • N Achillea sibirica
    Achillea sibirica
    Achillea sibirica is a plant in the daisy family, Asteraceae.-Description:Achillea sibirica is an herbaceous plant with alternate, pinnately compound leaves, on green stems. The flowers are white or pink, borne in summer. The plants are hardy in Zones 3-10 in full sun and are often about 2 feet...
    
     — Siberian yarrow, many-flowered yarrow

• Acinos
  Acinos
  Acinos is a genus of ten species of annual and short-lived evergreen perennial woody plants native to southern Europe and western Asia. Its name comes from the Greek word akinos, the name of a small aromatic plant. They are small, tufted, bushy or spreading plants growing to 10-45 cm tall...
  
  
  • X Acinos arvensis
    Acinos arvensis
    Acinos arvensis, also known as the Basil thyme, is a species of plant of the genus Acinos.It is a perennial that usually grows about 8 inches high and spreads 12 inches. It prefers to grow in strong sunlight.The delicate scent of it is faintly reminiscent of thyme, giving it its common name....
    
     — mother-of-thyme, spring savoury, basil thyme

• Aconitum
  Aconitum
  Aconitum , known as aconite, monkshood, wolfsbane, leopard's bane, women's bane, Devil's helmet or blue rocket, is a genus of over 250 species of flowering plants belonging to the buttercup family .-Overview:These herbaceous perennial plants are chiefly natives of the mountainous parts of the...
  
  
  • X Aconitum napellus
    Aconitum napellus
    Aconitum napellus is a species of Aconitum in the family Ranunculaceae, native and endemic to western and central Europe....
    
     — garden monk's-hood, helmet flower, Venus' chariot, aconite
  • X Aconitum variegatum — Manchurian monk's-hood
  • X Aconitum × bicolor (A. napellus × A. variegatum) — hybrid monk's-hood, two-coloured wolf's-bane

• Acorus
  Acorus
  Acorus is a genus of monocot flowering plants. This genus was once placed within the family Araceae , but more recent classifications place it in its own family Acoraceae and order Acorales, of which it is the sole genus of the oldest surviving line of monocots. The exact relationship of Acorus to...
  
  
  • N Acorus americanus
    Acorus americanus
    Acorus americanus, the American Sweet Flag, is an emergent wetland plant native to the northern United States and Canada. This perennial plant has bright green blade-shaped leaves that arising directly from the rhizomes and sheath into each other at the base. Additionally the blades have 2-6 raised...
    
     — sweetflag
  • X Acorus calamus — European sweetflag

• Acroptilon
  • X Acroptilon repens — Russian knapweed

• Actaea
  Actaea
  Actaea, commonly called baneberry or bugbane, is a genus of flowering plants belonging to the family Ranunculaceae, native to temperate regions of the Northern Hemisphere....
  
  
  • N Actaea pachypoda
    Actaea pachypoda
    Actaea pachypoda is a flowering plant in the family Ranunculaceae, native to eastern North America....
    
     — white baneberry, doll's-eyes
  • N Actaea rubra — red baneberry
  • N Actaea × ludovici (A. pachypoda × A. rubra) — hybrid baneberry

Ad

• Adenocaulon
  Adenocaulon
  Adenocaulon is a small genus of flowering plants in the daisy family known generally as trailplants. There are about six species which can be found in the Americas and eastern Asia.Species include:*Adenocaulon bicolor*Adenocaulon chilense...
  
  
  • N Adenocaulon bicolor
    Adenocaulon bicolor
    Adenocaulon bicolor is a flowering plant in the daisy family known as American trailplant. It is found in southern Canada and across the northern and western United States. This plant has a very thin erect branching stem surrounded by triangular leaves only at the base...
    
     — trail-plant

• Adiantum
  Maidenhair fern
  Adiantum , the maidenhair ferns, is a genus of about 200 species of ferns in the family Pteridaceae, though some researchers place it in its own family, Adiantaceae...
  
  
  • N Adiantum aleuticum
    Adiantum aleuticum
    Adiantum aleuticum is a species of fern in the genus Adiantum, native mainly to western North America from the Aleutian Islands of Alaska, south to Chihuahua, and also locally in northeastern North America from Newfoundland south to Maryland.The fronds grow to 15-110 cm high, and are...
    
     — western maidenhair fern
  • N Adiantum capillus-veneris
    Adiantum capillus-veneris
    Adiantum capillus-veneris, the Southern maidenhair fern, black maidenhair fern, and venus hair fern, is a species of fern in the genus Adiantum with a subcosmopolitan worldwide distribution...
    
     — southern maidenhair fern
  • N Adiantum pedatum
    Adiantum pedatum
    Adiantum pedatum is a maidenhair fern native to moist woodland in eastern North America.Adiantum aleuticum was once considered a subspecies...
    
     — northern maidenhair fern, five-finger fern
  • N Adiantum viridimontanum
    Adiantum viridimontanum
    Green Mountain maidenhair fern is a rare fern limited to outcrops of serpentine rock in New England and Canada. A hybrid between Adiantum pedatum and Adiantum aleuticum , it closely resembles its parent species...
    
     — Green Mountain maidenhair fern

• Adlumia
  • N Adlumia fungosa — Allegheny vine, climbing fumitory

• Adonis
  Adonis (plant)
  Adonis is a genus of about 20-30 species of flowering plants of the family Ranunculaceae, native to Europe and Asia.The species grow to 10-40 cm in height, with feathery, finely divided leaves...
  
  
  • X Adonis annua
    Adonis annua
    Adonis annua is a medicinal and ornamental plant and is a plant of the Ranunculaceae family.It...
    
     — pheasant's-eye

• Adoxa
  Moschatel
  Adoxa moschatellina is the sole member of the genus Adoxa. It grows in hedgerows throughout Europe, Asia, and North America, in cool forests, at low altitudes in the far north, to high altitudes in mountains in the south of its range...
  
  
  • N Adoxa moschatellina
    Moschatel
    Adoxa moschatellina is the sole member of the genus Adoxa. It grows in hedgerows throughout Europe, Asia, and North America, in cool forests, at low altitudes in the far north, to high altitudes in mountains in the south of its range...
    
     — moschatel, muskroot, townhall clock

Ae

• Aegopodium
  Aegopodium
  Aegopodium Native to Europe and western Asia. It is a genus of flowering plants of the carrot family Apiaceae, represented by about 7 species, all are perennial herbs. Flowers are compounded, umbels appearing in spring-summer...
  
  
  • X Aegopodium podagraria — goutweed, snow-on-the-mountain, goat's-foot, ground elder, bishop's weed

• Aesculus
  Aesculus
  The genus Aesculus comprises 13-19 species of woody trees and shrubs native to the temperate northern hemisphere, with 6 species native to North America and 7-13 species native to Eurasia; there are also several hybrids. Species are deciduous or evergreen...
  
  
  • N Aesculus glabra
    Ohio Buckeye
    The tree species Aesculus glabra is commonly known as Ohio buckeye, American buckeye, or fetid buckeye.It is native primarily to the Midwestern and lower Great Plains regions of the United States, extending southeast into the Nashville Basin. It is also found locally in the extreme southwest of...
    
     — Ohio buckeye, fœtid buckeye
  • X Aesculus hippocastanum — common horsechestnut

• Aethusa
  Aethusa
  Aethusa was in Greek mythology a daughter of Poseidon and Alcyone, who was beloved by Apollo, and bore to him Eleuther.The word aethusa was used as an epithet for a portico that was open to the sun, that is, Apollo....
  
  
  • X Aethusa cynapium — fool's-parsley

Ag

• Agalinis
  Agalinis
  Agalinis Raf. is a genus of about 70 species in North, Central, and South America that until recently was aligned with members of the family Scrophulariaceae. As a result of numerous molecular phylogenetic studies based on various chloroplast DNA loci, it was shown to be more closely related to...
  
  
  • N Agalinis gattingeri — Gattinger's agalinis Endangered
  • N Agalinis paupercula — small-flowered purple false-foxglove, small-flowered agalinis
  • N Agalinis purpurea — purple false foxglove, large purple agalinis
  • N Agalinis skinneriana — Skinner's agalinis Endangered
  • N Agalinis tenuifolia — slenderleaf purple false foxglove, slenderleaf agalinis

• Agastache
  Agastache
  Agastache, is a genus of 9–12 species of perennial herbs in the family Lamiaceae, native to eastern Asia and North America ....
  
  
  • N Agastache foeniculum
    Agastache foeniculum
    Agastache foeniculum , commonly called anise hyssop, is a species of perennial plant in the mint family,...
    
     — anise hyssop, blue giant hyssop
  • N Agastache nepetoides — yellow giant hyssop
  • N Agastache scrophulariifolia — purple giant hyssop

• Agoseris
  Agoseris
  Agoseris is a small genus of liguliferous herbs in the Asteraceae or sunflower family. In general appearance they are reminiscent of dandelions and are sometimes called mountain dandelion or false dandelion...
  
  
  • N Agoseris glauca
    Agoseris glauca
    Agoseris glauca is a species of flowering plant in the daisy family known by the common names pale agoseris, prairie agoseris, and short-beaked agoseris. It is native to northern and western North America from Alaska to Ontario to New Mexico, where it grows in many habitat types. This is a...
    
     — pale false-dandelion, prairie agoseris, pale agoseris, pale goat-chicory, large-flowered false-dandelion

• Agrimonia
  Agrimony
  Agrimonia, commonly known as Agrimony, is a genus of 12-15 species of perennial herbaceous flowering plants in the family Rosaceae, native to the temperate regions of the Northern Hemisphere, with one species also in Africa...
  
  
  • X Agrimonia eupatoria
    Agrimonia eupatoria
    Agrimonia eupatoria is a species of agrimony that is often referred to as common agrimony, church steeples or sticklewort....
    
     — medicinal agrimony, church steeples, European groovebur
  • N Agrimonia gryposepala
    Agrimonia gryposepala
    Agrimonia gryposepala is a small flowering plant of the rose family , which is native to North America and was used by various indigenous peoples to treat medical problems such as diarrhea and fever.-Name and description:Agrimonia gryposepala Agrimonia gryposepala (also known as Tall hairy...
    
     — tall hairy agrimony, tall hairy groovebur
  • N Agrimonia parviflora
    Agrimonia parviflora
    Agrimonia parviflora is a species of perennial herbaceous flowering plants. Small Flowered Agrimony,Harvestlice Agrimony, and Harvestlice are its most common names in the United States....
    
     — smallflower groovebur, harvestlice agrimony
  • N Agrimonia pubescens — soft groovebur, soft agrimony
  • N Agrimonia striata
    Agrimonia striata
    Agrimonia striata is a species of perennial forb belonging to the Rose family . It grows to about 40in. producing a dense cluster of 5-parted yellow flowers on a hairy stalk above pinnately-divided leaves...
    
     — woodland agrimony, grooved agrimony

• Agropyron
  Agropyron
  Agropyron is a genus of grasses , native to Europe and Asia. Species in the genus are commonly referred to as crested-wheat grasses...
  
  
  • X Agropyron cristatum
    Agropyron cristatum
    Agropyron cristatum is a species in the Poaceae family. This plant is often used as forage and erosion control...
    
     — crested wheatgrass

• Agrostemma
  Agrostemma
  Agrostemma is a genus of annual plants in the Caryophyllaceae family, containing the species known as corncockles. Its best-known member is A. githago, the Common Corncockle, which is a native of Europe where it is simply called "the Corncockle". The species is a weed of cereals and other crops,...
  
  
  • X Agrostemma githago — common corncockle

• Agrostis
  Agrostis
  Agrostis is a genus of over 100 species belonging to the grass family Poaceae, commonly referred to as the bent grasses...
  
  
  • ? Agrostis canina
    Agrostis canina
    Agrostis canina, known as brown bent or velvet bent, is a species of grass.-Description:Agrostis canina is a perennial plant, with stolons but no rhizomes, and culms which grow to a height of up to . It is frequently confused with Agrostis vinealis Agrostis canina, known as brown bent or velvet...
    
     — brown bentgrass
  • X Agrostis capillaris
    Agrostis capillaris
    Agrostis capillaris is a rhizomatous and stoloniferous perennial in the grass family . It is native to Eurasia and has been widely introduced in many parts of the world...
    
     — colonial bentgrass, browntop, Prince Edward Island bentgrass, Rhode Island bentgrass
  • X Agrostis gigantea
    Agrostis gigantea
    Agrostis gigantea, known by its common name Redtop, is a perennial grass of the Agrostis genus.It is native to Europe, but in the cooler areas of North America was widely used as a pasture grass until the 1940s. Although it has largely been replaced by soybeans and more palatable grasses, it still...
    
     — black bentgrass, redtop
  • N Agrostis hyemalis — winter bentgrass, ticklegrass
  • N Agrostis mertensii — northern bentgrass
  • N Agrostis perennans
    Agrostis perennans
    Agrostis perennans is species of grass in the Poaceae family.-Description:...
    
     — upland bentgrass, perennial bentgrass
  • N Agrostis scabra
    Agrostis scabra
    Agrostis scabra is a common species of grass known by the common names rough bent grass and ticklegrass. A tumbleweed, it is native to much of North America, and widely known elsewhere as an introduced species. It occurs in most of the United States except parts of the Southeast and most of...
    
     — rough bentgrass, tickle grass, rough hairgrass, twin bentgrass
  • N Agrostis stolonifera
    Agrostis stolonifera
    Agrostis stolonifera is a perennial grass species in the Poaceae family. It is stoloniferous and may form mats or tufts...
    
     — creeping bentgrass, spreading bentgrass

Ai

• Ailanthus
  Ailanthus
  Ailanthus is a genus of trees belonging to the family Simaroubaceae, in the order Sapindales . The genus is native from east Asia south to northern Australasia....
  
  
  • X Ailanthus altissima — tree-of-Heaven, Chinese sumac, stinktree, varnish tree

Aj

• Ajuga
  • X Ajuga genevensis
    Ajuga genevensis
    Ajuga genevensis is a herbaceous flowering plant native to Europe...
    
     — Geneva bugleweed
  • X Ajuga reptans
    Ajuga reptans
    Ajuga reptans, commonly known as Blue bugle, Bugleherb, Bugleweed, Carpetweed, Carpet Bungleweed, Common bugle, or Burgundy lace, is an herbaceous flowering plant native to Europe. This plant is often used as an ornamental plant. It is invasive in parts of North America.-Description:The bugle has...
    
     — carpet bugleweed, common bugle, creeping bugleweed

Al

• Alcea
  • X Alcea pallida — pale hollyhock
  • X Alcea rosea
    Alcea rosea
    Alcea rosea is an ornamental plant in the Malvaceae family....
    
     — hollyhock

• Alchemilla
  Alchemilla
  Alchemilla is a genus of herbaceous perennial plants in the Rosaceae, and a popular garden herb with the common name Lady's mantle. There are about 300 species, the majority native to cool temperate and subarctic regions of Europe and Asia, with a few species native to the mountains of Africa,...
  
  
  • X Alchemilla filicaulis — thin-stemmed lady's-mantle
  • X Alchemilla monticola — hairy lady's-mantle

• Aletris
  Aletris
  Aletris is a genus of flowering plants in the Nartheciaceae family.-External links:*...
  
  
  • N Aletris farinosa — colicroot Threatened

• Alisma
  Alisma
  Alisma is a genus of flowering plants in the family Alismataceae, members of which are commonly known as water-plantains. The genus consists of aquatic plants with leaves either floating or submerged, found in a variety of still water habitats around the world . The flowers are hermaphrodite, and...
  
  
  • N Alisma gramineum
    Alisma gramineum
    Alisma gramineum is a small aquatic plant in the water-plantain family. It has several common names including narrowleaf water-plantain, ribbonleaf water-plantain, and grass-leaved water-plantain. It grows in mud or submerged in shallow fresh or brackish water in marshy areas. The leaves and tiny...
    
     — grass-leaved water-plantain
  • N Alisma subcordatum
    Alisma subcordatum
    Alisma subcordatum is a perennial aquatic plant in the Water-plantain family . This plant grows to about 3 feet in height with lance to oval shaped leaves rising from bulbous corms with fibrous roots. Any leaves that form underwater are weak and quick to rot; they rarely remain on adult plants...
    
     — southern water-plantain
  • N Alisma triviale
    Alisma triviale
    Alisma triviale is a perennial semi-aquatic or aquatic plant in the Water-plantain family . It grows in shallow water or mud. Northern water plantain is native to Canada, the United States, and Northern Mexico....
    
     — northern water-plantain

• Alliaria
  Alliaria
  Alliaria is a genus of flowering plants in the mustard family.Species include:*Alliaria petiolata...
  
  
  • X Alliaria petiolata — garlic mustard, hedge garlic

• Allium
  Allium
  Allium is a monocot genus of flowering plants, informally referred to as the onion genus. The generic name Allium is the Latin word for garlic....
  
  
  • N Allium burdickii
    Allium burdickii
    Allium burdickii is a plant that is native to fertile soils of woods in North America. The onion flavored bulbs and leaves of this plant are edible....
    
     — narrow-leaved wild leek
  • N Allium canadense
    Allium canadense
    Wild onion , also known as Canada onion, wild garlic, meadow garlic, and Canadian garlic, is a perennial plant native to North America. It has an edible bulb covered with a dense skin of brown fibers and tastes like an onion. The plant also has strong, onion-like odor...
    
     — Canada wild onion, meadow garlic, meadow onion
  • N Allium cernuum
    Allium cernuum
    Allium cernuum, known as nodding onion and lady's leek, is a perennial plant in the genus Allium.It has an unsheathed slender conic bulb which gradually tapers directly into several keeled grass-like leaves . Each mature bulb bears a single flowering stem, which terminates in a downward nodding...
    
     — nodding onion
  • X Allium oleraceum — wild garlic
  • X Allium sativum — garlic
  • X Allium schoenoprasum var. schoenoprasum — chives
  • N Allium schoenoprasum var. sibiricum — Siberian chives
  • N Allium stellatum
    Allium stellatum
    Allium stellatum is a perennial wild onion native to North America, where it grows in rocky, sandy soil. It grows from a bulb to about 1-2 feet with tufts of leaves which die back as the scape of pink to purple flowers forms...
    
     — prairie onion, wild onion
  • N Allium tricoccum
    Wild leek
    Allium tricoccum — known as the ramp, spring onion, ramson, wild leek, wild garlic, and, in French, ail sauvage and ail des bois — is an early spring vegetable, a perennial wild onion. It has a strong garlic-like odor and a pronounced onion flavor. Ramps are found across North America, from the...
    
     — wild leek, small wild leek, ramps
  • X Allium vineale
    Allium vineale
    Allium vineale is a perennial bulbflower in the genus Allium, native to Europe, north Africa and western Asia. The species was introduced in Australia and North America, where it has become an invasive species....
    
     — field garlic

• Alnus
  Alder
  Alder is the common name of a genus of flowering plants belonging to the birch family . The genus comprises about 30 species of monoecious trees and shrubs, few reaching large size, distributed throughout the North Temperate Zone and in the Americas along the Andes southwards to...
  
  
  • X Alnus glutinosa — black alder, European alder
  • N Alnus incana
    Grey Alder
    Alnus incana is a species of alder with a wide range across the cooler parts of the Northern Hemisphere....
    
     — grey alder, white alder, hoary alder, speckled alder
  • N Alnus viridis
    Green Alder
    Alnus viridis is an alder with a wide range across the cooler parts of the Northern Hemisphere.-Description:It is a large shrub or small tree 3–12 m tall with smooth grey bark even in old age. The leaves are shiny green, ovoid, 3–8 cm long and 2–6 cm broad...
    
     — green alder, mountain alder, American green alder, Siberian alder, Sitka alder

• Alopecurus
  Alopecurus
  Alopecurus L., or Foxtail Grass, is a genus of the grass family Poaceae with 25 to 35 species.Foxtails occur in northern temperate regions. They can be annual or perennial. They grow in tufts. They have flat leaves and blunt ligules...
  
  
  • N Alopecurus aequalis
    Alopecurus aequalis
    Alopecurus aequalis is a common species of grass known by the common name shortawn foxtail.It is native to much of the temperate Northern Hemisphere from Eurasia to North America, where it can be found in many types of habitat.-Description:...
    
     — shortawn foxtail
  • N Alopecurus alpinus — alpine foxtail
  • X Alopecurus geniculatus
    Alopecurus geniculatus
    Alopecurus geniculatus is a species of grass known by the common name water foxtail or Marsh foxtail.It is native to much of Eurasia and North America, where it grows in moist areas. This is a perennial grass forming bunches of erect stems up to about 60 centimeters in maximum height. The leaves...
    
     — water foxtail
  • X Alopecurus pratensis — meadow foxtail

• Althaea
  Althaea (genus)
  Althaea is a genus of 6-12 species of perennial herbs native to Europe and western Asia. It includes Althaea officinalis, also known as the marshmallow plant, whence the fluffy confection got its name. They are found on the banks of rivers and in salt marshes, preferring moist, sandy soils. The...
  
  
  • X Althaea hirsuta — hairy marsh-mallow
  • X Althaea officinalis
    Althaea officinalis
    Althaea officinalis is a species indigenous to Africa, which is used as a medicinal plant and ornamental plant...
    
     — common marsh-mallow

• Alyssum
  Alyssum
  Alyssum is a genus of about 100–170 species of flowering plants in the family Brassicaceae, native to Europe, Asia, and northern Africa, with the highest species diversity in the Mediterranean region...
  
  
  • X Alyssum alyssoides
    Alyssum alyssoides
    Alyssum alyssoides is a species of flowering plant in the mustard family known by several common names, including pale madwort and yellow alyssum...
    
     — pale alyssum, small alyssum, yellow alyssum, pale madwort
  • X Alyssum murale — yellow-tuft

Am

• Amaranth
  Amaranth
  Amaranthus, collectively known as amaranth, is a cosmopolitan genus of herbs. Approximately 60 species are recognized, with inflorescences and foliage ranging from purple and red to gold...
  
  us
  • X Amaranthus albus
    Amaranthus albus
    Amaranthus albus is an annual species of flowering plant. It is native to the tropical Americas but a widespread introduced species in other places, including Europe, Africa, and Australia...
    
     — white tumbleweed, tumble pigweed, tumbleweed amaranth
  • X Amaranthus blitoides
    Amaranthus blitoides
    Amaranthus blitoides, commonly called Prostrate amaranth, Matweed, or Mat amaranth, is a glabrous annual plants species. It usually grows up to 0.6 m, though it may grow up to 1 m...
    
     — prostrate amaranth, prostrate pigweed, matweed
  • X Amaranthus blitum
    Amaranthus blitum
    Amaranthus blitum, commonly called purple amaranth is an annual plant species in economically important plant family Amaranthaceae....
    
     — purple amaranth
  • X Amaranthus cruentus
    Amaranthus cruentus
    Amaranthus cruentus is a common flowering plant species that yields the nutritious staple amaranth grain. It is one of three Amaranthus species cultivated as a grain source, the other two being Amaranthus hypochondriacus and Amaranthus caudatus...
    
     — blood amaranth, purple amaranth, red amaranth, caterpillar amaranth, African spinach
  • X Amaranthus hybridus
    Amaranthus hybridus
    Amaranthus hybridus, commonly called Smooth Amaranth, Smooth Pigweed, Red Amaranth, or Slim Amaranth, is a species of annual flowering plant. It is a weedy species found now over much of North America and introduced into Europe and Eurasia.-Description:A. hybridus grows from a short taproot and can...
    
     — smooth amaranth, hybrid amaranth, green pigweed, smooth pigweed, green amaranth
  • X Amaranthus palmeri
    Amaranthus palmeri
    Amaranthus palmeri is a species of edible flowering plant in the amaranth genus. It has several common names, including Palmer's amaranth, Palmer amaranth, Palmer's pigweed, and carelessweed. It is native to most of the southern half of North America. Populations in the eastern United States are...
    
     — Palmer's amaranth
  • X Amaranthus powellii
    Amaranthus powellii
    Amaranthus powellii is a species of amaranth known by the common names Powell's amaranth and green amaranth. It is native to the southwestern United States and northern Mexico, but it is common throughout most of the rest of the temperate Americas as a naturalized species. It has also been...
    
     — green amaranth, Powell's smooth amaranth
  • X Amaranthus retroflexus
    Amaranthus retroflexus
    Amaranthus retroflexus is a species of flowering plant in the Amaranthaceae family with several common names, including Red-root Amaranth, Redroot Pigweed, Red Rooted Pigweed, Common Amaranth, and common tumble weed....
    
     — redroot amaranth, redroot pigweed, wild-beet amaranth, rough pigweed
  • X Amaranthus spinosus
    Amaranthus spinosus
    Amaranthus spinosus, commonly known as the spiny amaranth, prickly amaranth or thorny amaranth. It is native to the tropical Americas, but it is present on most continents as an introduced species and sometimes a noxious weed. It can be a serious weed of rice cultivation in Asia...
    
     — spiny amaranth
  • N Amaranthus tuberculatus
    Amaranthus tuberculatus
    Amaranthus tuberculatus, commonly known as tall waterhemp or roughfruit amaranth, is a species of flowering plant. It is a summer annual broadleaf with a germination period that lasts several months...
    
     — roughfruit amaranth, roughfruit waterhemp, tall waterhemp, tall pigweed

• Ambrosia
  Ragweed
  Ragweeds are flowering plants in the genus Ambrosia in the sunflower family Asteraceae. Common names include bitterweeds and bloodweeds....
  
  
  • N Ambrosia artemisiifolia
    Ambrosia artemisiifolia
    Ambrosia artemisiifolia, Common Ragweed, is the most widespread plant of the genus Ambrosia in North America. It has also been called Annual Ragweed, Bitterweed, Blackweed, Carrot Weed, Hay Fever Weed, Roman Wormwood, Stammerwort, Stickweed, Tassel Weed, and American Wormwood...
    
     — common ragweed, annual ragweed, annual bur-sage
  • N Ambrosia psilostachya
    Ambrosia psilostachya
    Ambrosia psilostachya is a species of ragweed known by the common names Cuman ragweed, perennial ragweed, and western ragweed....
    
     — perennial ragweed, western ragweed, naked-spike ambrosia, Cuman ragweed
  • N Ambrosia trifida
    Ambrosia trifida
    Common names: Buffalo Weed, Great Ragweed, Giant Ragweed, Bitterweed, Bloodweed, Horse Cane, Tall AmbrosiaAmbrosia trifida is an annual plant in the aster family, native throughout much of North America. Its flowers are green and are pollinated by wind rather than by insects, and the pollen is one...
    
     — giant ragweed, great ragweed, buffalo-weed, skeleton-leaf bur-sage

• Amelanchier
  Serviceberry
  Amelanchier , also known as shadbush, shadwood or shadblow, serviceberry or sarvisberry, wild pear, juneberry, saskatoon, sugarplum or wild-plum, and chuckley pear is a genus of about 20 species of deciduous-leaved shrubs and small trees in the Rose family .Amelanchier is native to temperate regions...
  
  
  • N Amelanchier alnifolia — Saskatoonberry, northwestern serviceberry
  • N Amelanchier arborea
    Downy Serviceberry
    Amelanchier arborea , is native to eastern North America from the Gulf Coast north to Thunder Bay in Ontario and Lake St. John in Quebec, and west to Texas and Minnesota....
    
     — downy serviceberry, downy juneberry, common serviceberry
  • N Amelanchier bartramiana
    Amelanchier bartramiana
    Amelanchier bartramiana is a species of serviceberry. Common names include mountain serviceberry, Bartram's serviceberry, mountain juneberry, Bartram juneberry, and the oblongfruit serviceberry....
    
     — mountain juneberry, Bartram's shadbush, Bartram's chuckleypear
  • N Amelanchier canadensis
    Amelanchier canadensis
    Amelanchier canadensis is a species of Amelanchier native to eastern North America in Canada from Newfoundland west to southern Ontario, and in the United...
    
     — Canada serviceberry, swamp shadbush, thicket serviceberry
  • N Amelanchier humilis
    Amelanchier humilis
    Amelanchier humilis, commonly known as the low shadbush, is a species of serviceberry. The plant is a shrub. The fruit, which is a pome, is edible and can be eaten raw or cooked. The fruit has a sweet taste, with slight apple flavor. The leaves are oval or broad shaped.-External links:***...
    
     — low serviceberry, running serviceberry
  • N Amelanchier laevis
    Amelanchier laevis
    Amelanchier laevis is a small tree, growing up to 9m. The fruit, which are pomes, are edible and can be eaten raw or cooked. The fruit has a sweet flavor. The bark can be made into a herbal medicine for expectant mothers. It is a deciduous tree...
    
     — smooth juneberry, Allegheny serviceberry, smooth chuckleypear
  • N Amelanchier sanguinea
    Amelanchier sanguinea
    Amelanchier sanguinea, known as red-twigged shadbush or roundleaf serviceberry, is a shrub native to eastern North America. It can grow up to 3 metres tall, and has edible sweet-flavored fruits that are red when young and become purple or dark-blue when they ripen. Like all Amelanchier fruit, these...
    
     var. gaspensis — Gaspé roundleaf juneberry
  • N Amelanchier sanguinea var. sanguinea — roundleaf juneberry, roundleaf serviceberry, Fernald's chuckleypear
  • N Amelanchier stolonifera — running serviceberry, running juneberry, running chuckleypear
  • N Amelanchier × intermedia (A. arborea × A. canadensis) — swamp sugarpear
  • N Amelanchier × neglecta (A. bartramiana × A. laevis) — hybrid juneberry
  • N Amelanchier × quinti-martii (A. arborea × A. bartramiana) — Quint-mart's serviceberry
  • N Amelanchier × wiegandii (A. arborea × A. sanguinea) — Wiegand's serviceberry

• Amerorchis
  Amerorchis
  Amerorchis is a monotypic genus of the orchid family Orchidaceae containing Amerorchis rotundifolia, commonly called Small Round-leaved Orchid or simply Round-leaved Orchis, found throughout Canada and some northern US states....
  
  
  • N Amerorchis rotundifolia — small roundleaf orchis, oneleaf orchid

• Ammannia
  • N Ammannia robusta
    Ammannia robusta
    Ammannia robusta is a species of flowering plant in the loosestrife family known by the common name grand redstem. It is native to most of western and central North America, where it grows in moist places, such as ditches and pond margins. It is an annual herb reaching about a meter in maximum...
    
     — scarlet ammannia Endangered

• Ammophila
  • N Ammophila breviligulata
    Ammophila breviligulata
    Ammophila breviligulata is a species of grass that is native to eastern North America, where it grows on sand dunes along the Atlantic Ocean and Great Lakes coasts...
    
     — American beachgrass

• Amorpha
  Amorpha
  Amorpha is a genus of plants in the pea family Fabaceae. All the species are native to North America, from southern Canada, most of the United States, and northern Mexico. They are commonly known as false indigo...
  
  
  • N Amorpha canescens
    Amorpha canescens
    Amorpha canescens is a 1–3 feet tall deciduous shrub in the Pea family that is native to North America. It has very small purple flowers which are grouped in racemes. The compound leaves of this plant appear leaden due to their dense hairiness...
    
     — leadplant, downy indigobush
  • N Amorpha fruticosa
    Amorpha fruticosa
    Amorpha fruticosa is a species of flowering plant in the legume family known by several common names, including desert false indigo and bastard indigobush. It is found throughout eastern Canada, northern Mexico, and most of the continental United States, but it is probably naturalized in western...
    
     — false indigo

• Amphicarpaea
  Amphicarpaea
  Amphicarpaea is a genus of flowering plants in the legume family, Fabaceae. It belongs to the sub family Faboideae.Species include:*A. bracteata - Eastern North America*A. edgeworthii Benth. - range includes Japan...
  
  
  • N Amphicarpaea bracteata
    Amphicarpaea bracteata
    Amphicarpaea bracteata is an annual to perennial vine in the legume family, native to woodland, thickets, and moist slopes in eastern North America.-Description:Leaves have three leaflets and are held alternately on twining stems....
    
     — American hog-peanut

An

• Anagallis
  Anagallis
  Anagallis is a genus of about 20–25 species of flowering plants in the myrsine family Myrsinaceae, commonly called pimpernel and perhaps best known for the Scarlet pimpernel referred to in literature...
  
  
  • X Anagallis arvensis — scarlet pimpernel

• Anaphalis
  • N Anaphalis margaritacea
    Anaphalis margaritacea
    Anapahlis margaritacea, commonly known as the Western Pearly Everlasting, is a perennial herb in the composite family. Since it is the only North American species it is often simply called Pearly Everlasting in the United States and Canada. However, it is also native in Asia and has been widely...
    
     — pearly everlasting

• Anchusa
  Anchusa
  The genus Anchusa L. belongs to the tribe Boragineae of the borage family . It includes about 40 species.These species grow in Europe, North Africa, South Africa en Western Asia. They are introduced into the USA....
  
  
  • X Anchusa arvensis
    Anchusa arvensis
    Anchusa arvensis is a plant species of the genus Anchusa. Its common names include small bugloss and annual bugloss. This is a hairy annual herb which may reach one half to one meter in height. It bears small blue tubular flowers, four nutlets per flower, and one seed per nutlet...
    
     — small bugloss, annual bugloss, alkanet
  • X Anchusa officinalis
    Anchusa officinalis
    Anchusa officinalis or Common Bugloss or Alkanet is a plant species of the genus Anchusa....
    
     — common bugloss

• Andromeda
  Bog-rosemary
  Andromeda polifolia, commonly known as Bog-rosemary, is a heath found across northern parts of the Northern Hemisphere. It is the only member of its genus. Bog rosemary is only found in bogs in cold peat-accumulating areas....
  
  
  • N Andromeda glaucophylla — bog rosemary, rosemary-leaf marsh andromeda
  • N Andromeda polifolia var. jamesiana — James Bay bog rosemary
  • N Andromeda polifolia var. polifolia — northern bog rosemary, marsh holyrose

• Andropogon
  Andropogon
  Andropogon is a genus of grasses. Andropogon gerardii, big bluestem, is the official state grass of Illinois.Broomsedge is found along the eastern United States...
  
  
  • N Andropogon gerardii
    Big Bluestem
    Andropogon gerardii, known also as Big bluestem, Turkey foot, Prairie tallgrass, or simply Tallgrass, is a tall grass native to much of the Great Plains and Prairie regions of central North America- Description :...
    
     — big bluestem, turkeyfoot
  • N Andropogon virginicus
    Andropogon virginicus
    Andropogon virginicus is a species of grass known by several common names, including broomsedge bluestem and yellowsedge bluestem. It is native to the southeastern United States and as far north as the Great Lakes. It is known as an introduced species in California and Hawaii, where it is...
    
     — broom-sedge

• Androsace
  Androsace
  Androsace is the second largest genus in the Primulaceae. It is a predominantly Arctic-alpine genus with many species in the Himalayas , the mountains of central Asia, the Caucasus, and the southern and central European mountain systems, particularly the Alps and the Pyrenees.Recent molecular...
  
  
  • ? Androsace occidentalis
    Androsace occidentalis
    Androsace occidentalis is a species of flowering plant in the primrose family known by the common name western rockjasmine. It is native to much of southern Canada and the central United States, where it occurs in open habitat such as prairie, especially in moist areas. This is a diminutive annual...
    
     — western rock-jasmine
  • N Androsace septentrionalis
    Androsace septentrionalis
    Androsace septentrionalis is a species of annual herbaceous plant in the Primrose family , native to North America, Asia, and Europe...
    
     — pygmy-flower rock-jasmine, northern androsace

• Anemone
  Anemone
  Anemone , is a genus of about 120 species of flowering plants in the buttercup family Ranunculaceae in the north and south temperate zones...
  
  
  • N Anemone acutiloba
    Anemone acutiloba
    Anemone acutiloba was placed in the genus Hepatica but has been moved to Anemone. This is an attractive flowering, clump forming herbaceous plant species in the family Ranunculaceae. Plants grow 5 to 19 cm tall, flowering early to mid spring. The flowers are greenish-white, white, purple or...
    
     — sharp-lobed hepatica, sharp-lobed liverleaf
  • N Anemone americana — round-lobed hepatica, American liverleaf
  • X Anemone blanda
    Anemone blanda
    Anemone blanda is a tuberous perennial valued for its daisy-like spring-blooming flowers, native to southeastern Europe, Turkey, Lebanon, and Syria.-External links:**...
    
    
  • N Anemone canadensis
    Anemone canadensis
    Anemone canadensis is a herbaceous perennial native to moist meadows, thickets, streambanks, and lakeshores in North America, spreading rapidly by underground rhizomes, valued for its white flowers.-Description:Shoots with deeply divided and toothed basal leaves grow from caudices on long,...
    
     — Canada anemone, roundleaf thimbleweed
  • N Anemone cylindrica
    Anemone cylindrica
    Anemone cylindrica is a very upright growing, clump forming herbaceous plant species in the genus Anemone and family Ranunculaceae. Plants grow 30 to 100 cm tall, flowering early summer but often found flowering till late summer, the flowers are greenish-white. After flowering the fruits are...
    
     — long-fruited anemone, thimbleweed, candle anemone, long-headed anemone
  • N Anemone multifida
    Anemone multifida
    Anemone multifida is a species of flowering plant in the buttercup family known by the common names cutleaf anemone, Pacific anemone and globe anemone. It is native to northern North America from Alaska to New York and as far south as Arizona and New Mexico. It is also known from parts of South...
    
     — cutleaf anemone, cliff anemone, early anemone
  • N Anemone parviflora
    Anemone parviflora
    Anemone parviflora is a herbaceous plant species in the genus Anemone and family Ranunculaceae. Plants grow 10 to 30 cm tall, from a thin, 2 mm thick rhizome. Stem leaves without petioles, basal leaves few with long petioles and deeply 3-parted...
    
     — northern anemone, small-flowered anemone
  • N Anemone patens
    Pulsatilla patens
    Pulsatilla patens is a species of flowering plant in the family Ranunculaceae, native to Europe, Russia, Mongolia, China, Canada and the United States...
    
     — pasqueflower, prairie smoke, prairie crocus, cutleaf anemone
  • N Anemone quinquefolia
    Anemone quinquefolia
    Anemone quinquefolia is an early-spring flowering plant in the genus Anemone, native to North America. It is commonly called Wood Anemone, like Anemone nemorosa, a closely related European species...
    
     — wood anemone, snow-drops
  • N Anemone richardsonii — Richardson's anemone, yellow anemone
  • N Anemone virginiana
    Anemone virginiana
    Anemone virginiana is an upright growing herbaceous plant species in the genus Anemone and family Ranunculaceae. Plants grow 30 to 80 cm tall, flowering early summer but often found flowering till late summer, the flowers are white or greenish-white...
    
     — tall thimbleweed, riverbank anemone

• Anethum
  • X Anethum graveolens — dill, Indian dill

• Angelica
  Angelica
  Angelica is a genus of about 60 species of tall biennial and perennial herbs in the family Apiaceae, native to temperate and subarctic regions of the Northern Hemisphere, reaching as far North as Iceland and Lapland...
  
  
  • N Angelica atropurpurea
    Angelica atropurpurea
    Angelica atropurpurea is a species of plant that can be found in moist and swampy woodlands, mostly by riverbanks. The plant grows to 6 feet tall with an erect branching stem that is purple. The stem is smooth, hollow, and sturdy. The leaves are divided into three parts, each with its own petiole....
    
     — purplestem angelica, dark-purple alexanders, wild masterwort, great angelica
  • ? Angelica lucida
    Angelica lucida
    Angelica lucida is a species of angelica known by the common names seacoast angelica and sea-watch. It is also one of many species in the celery family which are casually called wild celery. This plant is generally similar in appearance to other angelicas, with tall, dense umbels of yellowish-white...
    
     — seabeach angelica, shiny angelica
  • X Angelica sylvestris
  • ? Angelica venenosa — hairy angelica

• Anoda
  Anoda
  Anoda is a genus of flowering plants in the mallow family. There are 23 or 24 species of these herbs, most native to Mexico and South America. They are generally erect plants with a variety of leaf shapes, and many bear colorful flowers...
  
  
  • X Anoda cristata
    Anoda cristata
    Anoda cristata is a species of flowering plant in the mallow family known by many common names, including spurred anoda, crested anoda, and violettas. Its exact native range is unclear but it probably spans Mexico and part or all of Central America. It is known throughout the rest of the Americas...
    
     — crested anoda

• Antennaria
  Antennaria
  Antennaria is a genus of about 45 species of herbaceous perennial plants in the family Asteraceae, native to temperate regions of the Northern Hemisphere, with one species in temperate southern South America; the highest species diversity is in North America...
  
  
  • N Antennaria howellii
    Antennaria howellii
    Antennaria howellii is a species in the genus Antennaria, native to northern North America from Alaska east to Newfoundland, and south to northern California, Colorado and North Carolina....
    
     subsp. canadensis — Canada pussytoes
  • N Antennaria howellii subsp. howellii — Howell's pussytoes
  • N Antennaria howellii subsp. neodioica — northern pussytoes, common pussytoes
  • N Antennaria howellii subsp. petaloidea — small pussytoes
  • N Antennaria microphylla
    Antennaria microphylla
    Antennaria microphylla is a stoloniferous perennial forb in the Aster family . It grows from with spoon shaped or oblong leaves; it blossoms from late May to July...
    
     — littleleaf pussytoes
  • N Antennaria neglecta — field pussytoes
  • N Antennaria oxyphylla
  • N Antennaria parlinii subsp. fallax — largeleaf pussytoes, deceitful pussytoes
  • N Antennaria parlinii subsp. parlinii — Parlin's pussytoes, smooth pussytoes, plainleaf pussytoes
  • N Antennaria parvifolia
    Antennaria parvifolia
    Antennaria parvifolia is a species of flowering plant in the aster family known by the common names Nuttall's pussytoes and small-leaf pussytoes . It is native to North America, where it occurs throughout much of Canada from British Columbia to Ontario, the western and central United States, and...
    
     — small-leaf pussytoes, Rocky Mountain cudweed, Nuttall's pussytoes
  • N Antennaria pulcherrima — showy pussytoes, handsome pussytoes
  • N Antennaria rosea
    Antennaria rosea
    Antennaria rosea is a species of flowering plant in the daisy family known by the common name rosy pussytoes. It is native to much of North America, including most of Canada and the western United States. It is a plant of many habitats, from dry to wet climates and low elevation to very high. It is...
    
     — rosy pussytoes, pink everlasting
  • N Antennaria subviscosa

• Anthemis
  Anthemis
  Anthemis is a genus of about 100 species of aromatic herbs in the Asteraceae, closely related to Chamaemelum, and like that genus, known by the common name chamomile; some species are also called dog-fennel or mayweed. However, Mayweed is improperly used for this genus since Mayweed refers to the...
  
  
  • X Anthemis arvensis
    Anthemis arvensis
    Anthemis arvensis, which is also known as corn chamomile or mayweed, scentless chamomile, and # field chamomile, anthémis des champs, fausse camomille, Ackerkamille, camomila-do-campo , manzanilla silvestre is a species of the genus Anthemis and in the Asteraceae family...
    
     — corn chamomile, field chamomile
  • X Anthemis cotula
    Anthemis cotula
    Anthemis cotula, also known as stinking chamomile, is a flowering annual plant with a noticeable and strong odor. The odor is often considered unpleasant, and it is from this that it gains the common epithet "stinking". It is initially native to Europe and North Africa...
    
     — mayweed, stinking chamomile, fœtid chamomile, dog fennel, stinking mayweed
  • X Anthemis tinctoria
    Anthemis tinctoria
    Cota tinctoria, or Golden Marguerite and Yellow Chamomile, is a species in the genus Anthemis of the Sunflower family ....
    
     — golden chamomile

• Anthoxanthum
  Anthoxanthum
  Anthoxanthum, the vernal grasses or vernalgrasses, is a large genus of true grass with a cosmopolitan distribution.A. odoratum is a common species of acidic grassland and bogs in northern Europe....
  
  
  • X Anthoxanthum odoratum
    Anthoxanthum odoratum
    -Introduction:Anthoxanthum odoratum, known as sweet vernal grass, holy grass, vanilla grass or buffalo grass, is a short-lived grass found wild in acidic grassland in Eurasia. It is also grown as a lawn grass and a house plant, due to its sweet scent, and can also be found on unimproved pastures...
    
     — sweet vernalgrass, sweetgrass

• Anthriscus
  Anthriscus
  Anthriscus or Chervil is a common plant genus of the family Apiaceae, growing in Europe and temperate parts of Asia. It comprises 12 species, some of which are considered as noxious weeds...
  
  
  • X Anthriscus cerefolium — common chervil
  • X Anthriscus sylvestris — wild chervil, woodland chervil, cow parsley, beak-chervil

• Anthyllis
  Anthyllis
  Anthyllis is a genus of plants in the family Fabaceae. This genus contains both herbaceous and shrubby species and is distributed in Europe, the Middle East and North Africa. The most widespread and familiar species is Kidney Vetch Anthyllis is a genus of plants in the family Fabaceae. This genus...
  
  
  • X Anthyllis vulneraria
    Anthyllis vulneraria
    Anthyllis vulneraria is a medicinal plant native to Europe. The name vulneraria means "wound healer".-Description:...
    
     — kidney vetch, lady's fingers

• Antirrhinum
  Antirrhinum
  Antirrhinum is a genus of plants commonly known as snapdragons from the flowers' fancied resemblance to the face of a dragon that opens and closes its mouth when laterally squeezed...
  
  
  • X Antirrhinum majus
    Antirrhinum majus
    Antirrhinum majus is a species of plants belonging to the genus Antirrhinum...
    
     — common snapdragon
  • X Antirrhinum orontium — lesser snapdragon

Ap

• Apera
  Apera
  Apera is a small genus of annual grasses, known commonly as silkybent grass or windgrass. They are native to Europe and western Asia but have been introduced and naturalized elsewhere, especially A. interrupta and A...
  
  
  • X Apera interrupta — dense silky bentgrass, interrupted bentgrass, interrupted windgrass
  • X Apera spica-venti — silky bentgrass

• Apios
  Apios
  Apios is a genus of flowering plants in the legume family, Fabaceae. It belongs to the sub family Faboideae....
  
  
  • N Apios americana
    Apios americana
    Apios americana, sometimes called the potato bean, hopniss, Indian potato or groundnut is a perennial vine native to eastern North America, and bears edible beans and large edible tubers. It grows to 3–4 m long, with pinnate leaves 8–15 cm long with 5–7 leaflets...
    
     — American groundnut, Indian potato, wild bean, potato-bean

• Aplectrum
  • N Aplectrum hyemale
    Aplectrum hyemale
    Aplectrum hyemale is a species of orchids and the sole species of the genus Aplectrum. The generic name comes from Greek and signifies "spurless"...
    
     — puttyroot

• Apocynum
  Apocynum
  Apocynum, commonly known as Dogbane and Indian Hemp, is a genus of the plant family of the Apocynaceae with seven species. From the Greek: apo, away; cyno, dog, attributed to its toxicity...
  
  
  • N Apocynum androsaemifolium
    Apocynum androsaemifolium
    Apocynum androsaemifolium is a flowering plant. Milky sap appears on broken stems. Leaf margin is entire and leaf veination is alternate. Its leaves appear as pointed ovals, while...
    
     — spreading dogbane
  • N Apocynum cannabinum
    Apocynum cannabinum
    Apocynum cannabinum is a perennial herbaceous plant that grows throughout much of North America - in the southern half of Canada and throughout the United States. It is a poisonous plant: Apocynum means "poisonous to dogs"...
    
     — Indian hemp, clasping-leaf dogbane, prairie dogbane, velvet dogbane, amyroot
  • N Apocynum sibiricum — clasping-leaved dogbane
  • N Apocynum × floribundum (A. androsaemifolium × A. cannabinum) — intermediate dogbane, bitter dogbane

Aq

• Aquilegia
  Aquilegia
  Aquilegia is a genus of about 60-70 species of perennial plants that are found in meadows, woodlands, and at higher altitudes throughout the Northern Hemisphere, known for the spurred petals of their flowers.-Etymology:The genus name Aquilegia is derived from the Latin word for eagle , because...
  
  
  • N Aquilegia brevistyla — small-flowered columbine
  • N Aquilegia canadensis
    Wild Columbine
    Aquilegia canadensis is a herbaceous perennial native to woodland and rocky slopes in eastern North America, prized for its red and yellow flowers. It readily hybridizes with other species in the genus.-Description:Height is...
    
     — Canadian columbine, red columbine
  • X Aquilegia vulgaris
    Aquilegia vulgaris
    Aquilegia vulgaris is a species of columbine native to Europe.- Description :It is a herbaceous perennial plant growing to 1.2 m tall, with branched, thinly hairy stems...
    
     — European columbine, garden columbine, culverwort, capon's feather

Ar

• Arabidopsis
  Arabidopsis
  Arabidopsis is a genus in the family Brassicaceae. They are small flowering plants related to cabbage and mustard. This genus is of great interest since it contains thale cress , one of the model organisms used for studying plant biology and the first plant to have its entire genome sequenced...
  
  
  • X Arabidopsis thaliana
    Arabidopsis thaliana
    Arabidopsis thaliana is a small flowering plant native to Europe, Asia, and northwestern Africa. A spring annual with a relatively short life cycle, arabidopsis is popular as a model organism in plant biology and genetics...
    
     — mouse-ear cress, wall-cress

• Arabis
  Arabis
  Arabis , or rockcress, is a genus of flowering plants, within the family Brassicaceae, subfamily Brassicoideae.Though traditionally recognized as a large genus with many Old World and New World members, more recent evaluations of the relationships among these species using genetic data suggest that...
  
  
  • N Arabis alpina
    Arabis alpina
    Arabis alpina is a flowering plant in the family Brassicaceae that grows in mountainous areas of Europe, north Africa, central and eastern Asia and parts of North America. In the British Isles, it is only known to occur in a few locations in the Cuillin Ridge of the Isle of Skye.The stems of A...
    
     subsp. alpina — alpine rockcress
  • X Arabis alpina subsp. caucasica — wall rockcress, grey rockcress
  • N Arabis arenicola var. arenicola — arctic rockcress
  • N Arabis arenicola var. pubescens — sand rockcress
  • N Arabis canadensis — sicklepod
  • N Arabis divaricarpa — limestone rockcress
  • N Arabis drummondii — Drummond rockcress
  • N Arabis glabra
    Arabis glabra
    Arabis glabra, or tower mustard, is a tall, slim, grey-green plant with small creamy flowers at the top of the stem. It usually grows on poor chalky or sandy soils, in open situations. It is native to Europe, Asia, and North Africa, and it is widespread in North America where it is also probably...
    
     — tower-mustard
  • N Arabis hirsuta
    Arabis hirsuta
    Arabis hirsuta is a flowering plant of the genus Arabis in the family Brassicaceae. It is native to Europe, Asia, and the northern half of North America.-External links:****...
    
     var. adpressipilis — hairy rockcress, creamflower rockcress
  • N Arabis hirsuta var. pycnocarpa — creamflower rockcress
  • N Arabis holboelli var. retrofracta — Holboell's rockcress
  • N Arabis holboelli var. secunda — bristly-leaved rockcress
  • ? Arabis kamchatica — lyreleaf rockcress (species status disputed)
  • N Arabis laevigata — smooth rockcress
  • N Arabis lyrata — lyreleaf rockcress
  • N Arabis shortii — Short's rockcress

• Aralia
  Aralia
  Aralia , or Spikenard, is a genus of the plant family Araliaceae, consisting of 68 accepted species of deciduous or evergreen trees, shrubs, and rhizomatous herbaceous perennials. The genus is native to Asia and the Americas, with most species occurring in mountain woodlands...
  
  
  • X Aralia elata
    Aralia elata
    Aralia elata or Japanese Angelica-tree is a woody plant belonging to the Aralia family .-Description:It is an upright deciduous small tree or shrub growing up to 6 m in height, native to eastern Russia, China, Korea, and Japan....
    
     — Japanese Angelica-tree, Chinese Angelica-tree
  • N Aralia hispida — bristly spikenard, bristly sarsaparilla, dwarf elder
  • N Aralia nudicaulis
    Aralia nudicaulis
    Aralia nudicaulis is a flowering plant of northern and eastern North America which reaches a height of 1–2 feet with creeping underground stems.In the spring the underground stems produce compound leaves that are large...
    
     — wild sarsaparilla, small spikenard
  • N Aralia racemosa
    Aralia racemosa
    Aralia racemosa is an ornamental plant in the Araliaceae family native to the United States and Canada. It is a herbaceous plant, about one to two meters tall, which grows in shady areas. Its native range includes most of the eastern United States.-External links:**...
    
     — American spikenard, Indian-root, life-of-man, petty morel
  • X Aralia spinosa
    Aralia spinosa
    Aralia spinosa, commonly known as Devil's Walkingstick, is a woody species of plants in the genus Aralia, family Araliaceae, native to eastern North America. The various names refer to the viciously sharp, spiny stems, petioles, and even leaf midribs...
    
     — Hercules' club, Devil's walkingstick, prickly ash, Angelica tree, toothache tree

• Arceuthobium
  Arceuthobium
  The genus Arceuthobium, commonly called Dwarf Mistletoes, is a genus of 42 species of parasitic plants that parasitize members of Pinaceae and Cupressaceae in North America, Central America, Asia and Africa. Of the 42 species, 39 and 21 are endemic to North America and the United States, respectively...
  
  
  • N Arceuthobium americanum
    Arceuthobium americanum
    Arceuthobium americanum is a species of dwarf mistletoe known as American dwarf mistletoe and lodgepole-pine dwarf mistletoe. It is a common plant of western North America where it lives in high elevation pine forests. It is a parasitic plant which lives upon the Lodgepole Pine, particularly the...
    
     — pine mistletoe, American mistletoe, lodgepole pine dwarf mistletoe
  • N Arceuthobium pusillum — dwarf mistletoe, eastern dwarf mistletoe

• Arctagrostis
  Arctagrostis
  Arctagrostis is a genus of grass in the Poaceae family.- External links :*...
  
  
  • N Arctagrostis latifolia — polargrass

• Arctium
  • X Arctium lappa — great burdock
  • X Arctium minus subsp. minus — common burdock
  • X Arctium minus subsp. nemorosum — lesser burdock
  • X Arctium pubens — wood burdock
  • X Arctium tomentosum
    Arctium tomentosum
    Arctium tomentosum, commonly known as the downy burdock or woolly burdock, is a species of burdock that grows in Europe and western Asia. It is a biennial herbaceous plant. It was described by Philip Miller in 1768....
    
     — woolly burdock, tomentose burdock
  • X Arctium × nothum (A. lappa × A. minus) — hybrid burdock

• Arctophila
  Arctophila
  Arctophila is a genus of grass in the Poaceae family.- External links :*...
  
  
  • N Arctophila fulva — pendant grass

• Arctostaphylos
  Arctostaphylos
  Arctostaphylos is a genus of plants comprised by the manzanitas and bearberries. They are shrubs or small trees.There are about 60 species of Arctostaphylos, ranging from ground-hugging arctic, coastal, and mountain species to small trees up to 6 m tall. Most are evergreen , with small oval...
  
  
  • N Arctostaphylos alpina — alpine bearberry
  • N Arctostaphylos rubra
    Arctostaphylos rubra
    Arctostaphylos rubra is a species of flowering plant in the heath family and the genus Arctostaphylos, the manzanitas and bearberries. Common names include red fruit bearberry, alpine bearberry, arctic bearberry, red manzanita, and ravenberry. It is native to Eurasia and northern North America from...
    
     — red manzanita
  • N Arctostaphylos uva-ursi
    Bearberry
    Bearberries are three species of dwarf shrubs in the genus Arctostaphylos. Unlike the other species of Arctostaphylos , they are adapted to Arctic and sub-Arctic climates, and have a circumpolar distribution in northern North America, Asia and Europe, one with a small highly disjunctive population...
    
     — bearberry, kinnikinnick, mealberry

• Arenaria
  Arenaria (plant)
  Arenaria is a genus of flowering plants, within the family Caryophyllaceae.Species of this genus are among those plants commonly known as "sandworts". Several species formerly classified within Arenaria are now classed in the genera Spergularia, Eremogone and Minuartia.Species include:*Arenaria...
  
  
  • N Arenaria humifusa — creeping sandwort, low sandwort, spreading sandwort
  • X Arenaria serpyllifolia
    Arenaria serpyllifolia
    Arenaria serpyllifolia or Thyme-leaved Sandwort is a plant in the family Caryophyllaceae....
    
     — thymeleaf sandwort

• Arethusa
  Arethusa
  - Mythology :* Arethusa , a nereid nymph who became a fountain* See Hesperides for Arethusa, a hesperid nymph- Places :* Arethusa , an ancient city in Mygdonia of ancient Macedonia* Arethusa , a titular see of Syria near Apameia...
  
  
  • N Arethusa bulbosa
    Dragon's mouth
    For the name of the series of straits separating the Gulf of Paria from the Caribbean Sea, see Bocas del DragónArethusa bulbosa, commonly called Dragon's Mouth Orchid, is the only species in the orchid genus Arethusa. The genus is named after a naiad of Greek mythology...
    
     — dragon's mouth, swamp pink

• Argemone
  Argemone
  Argemone is a genus of flowering plants in the family Papaveraceae. It contains 30 to 32 species, commonly known as prickly poppies, that are native to the Americas and Hawaii...
  
  
  • X Argemone mexicana
    Argemone mexicana
    Argemone mexicana is a species of poppy found in Mexico and now widely naturalized in the United States, India and Ethiopia...
    
     — Mexican prickly-poppy

• Arisaema
  Arisaema
  Arisaema is a genus of about 150 species in the flowering plant family Araceae, native to eastern and central Africa, Asia and eastern North America. Its species are often called Cobra lilies, particularly the Asiatic species...
  
  
  • N Arisaema dracontium
    Arisaema dracontium
    Arisaema dracontium is a herbaceous perennial plant in the genus Arisaema and the family Araceae. It is native to North America from Quebec to Minnesota South to Florida and Texas, where it is found growing in damp woods. Plants grow 20–50 cm tall when in bloom and after flowering reach...
    
     — green dragon Special Concern
  • N Arisaema triphyllum
    Arisaema triphyllum
    Arisaema triphyllum is a herbaceous perennial plant growing from a corm. It is a highly variable species typically growing from 30 to 65 cm in height with three parted leaves and flowers contained in a spadix that is covered by a hood...
    
     — Jack-in-the-pulpit

• Aristida
  • N Aristida basiramea — forktip threeawn Endangered
  • N Aristida dichotoma — Shinner's threeawn
  • N Aristida longespica var. geniculata — red threeawn
  • N Aristida longespica var. longespica — slimspike threeawn
  • X Aristida oligantha
    Aristida oligantha
    Aristida oligantha is a species of grass known by the common names prairie threeawn and oldfield threeawn.It is native to the United States and southern Canada, and it is known from northern Mexico. It is a grass of many types of habitat, and it grows easily in dry areas with sandy or gravelly soils...
    
     — prairie three-awn grass
  • N Aristida purpurascens — arrow feather threeawn

• Aristolochia
  Aristolochia
  Aristolochia is a large plant genus with over 500 species. Collectively known as birthworts, pipevines or Dutchman's pipes, they are the namesake of the family . They are widespread and occur in the most diverse climates. Some species, like A. utriformis and A...
  
  
  • X Aristolochia clematitis
    Aristolochia clematitis
    Aristolochia clematitis, Birthwort, is a twining herbaceous plant in the Aristolochiaceae family, which is native to Europe. The leaves are heart shaped and the flowers are pale yellow and tubular in form...
    
     — birthwort
  • X Aristolochia macrophylla — pipevine

• Armeria
  Armeria
  Armeria is the botanical name for a genus of flowering plants. These plants are sometimes known as "thrift" or as the "sea pinks" as they are often found on coastlines...
  
  
  • N Armeria maritima
    Armeria maritima
    Armeria maritima is the botanical name for a species of flowering plant.It is a popular garden flower, known by several common names, including thrift, sea thrift, and sea pink. The plant has been distributed worldwide as a garden and cut flower...
    
     — sea thrift, Labrador sea thrift, foxflower

• Armoracia
  • X Armoracia rusticana — horseradish, red cole

• Arnica
  Arnica
  Arnica is a genus with about 30 perennial, herbaceous species, belonging to the sunflower family . The genus name Arnica may be derived from the Greek arna, "lamb", in reference to the soft, hairy leaves....
  
  
  • N Arnica angustifolia — narrowleaf arnica, arctic arnica, arctic leopardbane
  • N Arnica chamissonis — meadow arnica, Chamisso's arnica, leafy arnica, leafy leopardbane
  • N Arnica cordifolia
    Arnica cordifolia
    Arnica cordifolia is a species of arnica known by the common name heartleaf arnica. It is native to western North America from Alaska to California to New Mexico, and it is distributed as far east as Ontario and Michigan...
    
     — heartleaf arnica, heartleaf leopardbane
  • N Arnica lonchophylla — northern arnica, longleaf arnica, white-plumed arnica, spearleaf arnica

• Arnoglossum
  • N Arnoglossum platagineum — tuberous Indian-plantain Special Concern

• Aronia
  Chokeberry
  Aronia, the chokeberries, are two to three species of deciduous shrubs in the family Rosaceae, native to eastern North America. They are most commonly found in wet woods and swamps. Chokeberries are cultivated as ornamental plants and also because they are very high in antioxidant pigment...
  
  
  • N Aronia melanocarpa
    Chokeberry
    Aronia, the chokeberries, are two to three species of deciduous shrubs in the family Rosaceae, native to eastern North America. They are most commonly found in wet woods and swamps. Chokeberries are cultivated as ornamental plants and also because they are very high in antioxidant pigment...
    
     — black chokeberry

• Arrhenatherum
  Arrhenatherum
  Arrhenatherum, commonly called Oat-grass or Button-grass, is a genus with seven species and subspecies from the grass family Poaceae. It grows in Europe and the Mediterranean. Wild forms resemble Wild Oat or Fescue...
  
  
  • X Arrhenatherum elatius
    Arrhenatherum elatius
    -Introduction:Arrhenatherum elatius, with the common names false oat-grass, tall oat-grass, tall meadow oat, onion couch and tuber oat-grass, is a perennial species of grass, common in the temperate regions of Europe....
    
     — tall oatgrass, French rye, tuber oatgrass, bulbous oatgrass, false oat grass

• Artemisia
  • X Artemisia abrotanum — southern wormwood, southernwood, lad's love, oldman
  • X Artemisia absinthium
    Artemisia absinthium
    Artemisia absinthium is a species of wormwood, native to temperate regions of Eurasia and northern Africa....
    
     — common wormwood, absinthe, absinthe wormwood, European wormwood
  • X Artemisia annua
    Artemisia annua
    Artemisia annua, also known as Sweet Wormwood, Sweet Annie, Sweet Sagewort or Annual Wormwood , is a common type of wormwood that is native to temperate Asia, but naturalized throughout the world.-Characteristics:...
    
     — sweet sagewort, annual wormwood, sweet Annie, sweet wormwood, annual mugwort
  • X Artemisia biennis
    Artemisia biennis
    Artemisia biennis is a species of sagebrush known by the common name biennial wormwood. It is native to Europe.-Description:This is an annual or biennial herb producing a single erect green to reddish stem up to 2 meters in maximum height. It is generally hairless and unscented...
    
     — biennial wormwood
  • N Artemisia campestris
    Artemisia campestris
    Artemisia campestris L. is a species of herbaceous biennial or perennial plants in the genus Artemisia that grows in open sites on dry sandy soils throughout the Boreal Kingdom.-External links:** in Flora of North America...
    
     subsp. borealis — boreal wormwood, Canada wormwood
  • N Artemisia campestris subsp. caudata — tall wormwood, beach wormwood, wild wormwood, threadleaf sagewort, sagewort wormwood
  • N Artemisia dracunculus
    Tarragon
    Tarragon or dragon's-wort is a perennial herb in the family Asteraceae related to wormwood. Corresponding to its species name, a common term for the plant is "dragon herb". It is native to a wide area of the Northern Hemisphere from easternmost Europe across central and eastern Asia to India,...
    
     — wild tarragon, dragon wormwood, dragon sagewort, false tarragon, French tarragon, Russian tarragon
  • N Artemisia frigida — fringed sagebrush, prairie sagebrush, fringed sagewort, prairie sagewort, wormwood sage, pasture sage, arctic sagebrush
  • N Artemisia ludoviciana
    Artemisia ludoviciana
    Artemisia ludoviciana is a species of sagebrush known by several common names, including silver wormwood, Louisiana wormwood, white sagebrush, and gray sagewort....
    
     — white sage, silver wormwood, prairie sage, western mugwort, darkleaf mugwort, cudweed sagewort, pasture sage, Louisiana wormwood, Louisiana sage, silver king artemisia, white wormwood, white sagebrush
  • X Artemisia pontica — Roman wormwood, petite wormwood, green ginger
  • X Artemisia stelleriana — hoary sagebrush, dusty miller, beach wormwood, old woman
  • N Artemisia tilesii — Tilesius' wormood, mountain sagewort, oldwoman
  • X Artemisia vulgaris
    Artemisia vulgaris
    Artemisia vulgaris is one of several species in the genus Artemisia which have common names that include the word mugwort. This species is also occasionally known as Felon Herb, Chrysanthemum Weed, Wild Wormwood, Old uncle Henry, Sailor's Tobacco, Naughty Man, Old Man or St...
    
     — common mugwort, common wormwood

• Aruncus
  Aruncus
  Aruncus is a genus of herbaceous plants in the Rosaceae, subfamily Spiraeoideae. Botanical opinion of the number of species differs, with from one to four species accepted....
  
  
  • X Aruncus dioicus
    Aruncus dioicus
    Aruncus dioicus is a plant in the rose family, Rosaceae. It is a herbaceous plant with alternate, pinnately compound leaves, on thin, stiff stems. The flowers are white, borne in summer. This plant can be found throughout Europe, Asia, and eastern and western North America...
    
     — common goat's-beard

As

• Asarum
  Asarum
  Asarum is a genus of plants in the birthwort family Aristolochiaceae, commonly known as Wild ginger.- Description :...
  
  
  • N Asarum canadense
    Asarum canadense
    Asarum canadense, commonly known as Canada wild ginger, Canadian snakeroot and broad-leaved asarabaccais, is a herbaceous perennial native to deciduous forest in eastern North America, from the Great Plains east to the Atlantic Coast, and from southeastern Canada south to approximately the fall...
    
     — Canada wild ginger

• Asclepias
  Asclepias
  Asclepias L. , the milkweeds, is a genus of herbaceous perennial, dicotyledonous plants that contains over 140 known species...
  
  
  • N Asclepias exaltata — poke milkweed, tall milkweed, four-leaved milkweed
  • N Asclepias hirtella — tall green milkweed
  • N Asclepias incarnata
    Swamp Milkweed
    Asclepias incarnata is a herbaceous, perennial plant species native to North America...
    
     — swamp milkweed
  • N Asclepias ovalifolia — oval-leaf milkweed, dwarf milkweed
  • N Asclepias purpurascens
    Asclepias purpurascens
    Purple milkweed is a herbaceous plant species. It is in the genus Asclepias, making it a type of milkweed. It is native to the Eastern, Southern and Midwestern United States similar to the range of the Common Milkweed...
    
     — purple milkweed
  • N Asclepias quadrifolia — four-leaved milkweed
  • N Asclepias sullivantii — Sullivant's milkweed
  • N Asclepias syriaca
    Common Milkweed
    Asclepias syriaca, commonly called Common Milkweed, Butterfly flower, Silkweed, Silky Swallow-wort, Virginia Silkweed, is a herbaceous plant species. It is in the genus Asclepias, making it a type of milkweed. This species is native to most of North America east of the Rocky Mountains, excluding...
    
     — common milkweed, silkweed, silky swallow-wort
  • N Asclepias tuberosa
    Butterfly weed
    Asclepias tuberosa is a species of milkweed native to eastern North America. It is a perennial plant growing to tall, with clustered orange or yellow flowers from early summer to early fall. The leaves are spirally arranged, lanceolate, 5–12 cm long and 2–3 cm broad.This plant favors...
    
     — butterfly weed, orange milkweed, pleurisy root, chigger flower
  • ? Asclepias variegata — white milkweed
  • N Asclepias verticillata
    Asclepias verticillata
    Asclepias verticillata is a species of milkweed which is used as a medicinal plant by Native American tribes and in Butterfly gardening.-Description:...
    
     — whorled milkweed
  • N Asclepias viridiflora — green milkweed, green comet milkweed, short green milkweed

• Asimina
  • N Asimina triloba
    Asimina triloba
    Asimina triloba, the pawpaw, paw paw, paw-paw, or common pawpaw, is a species of Asimina in the same plant family as the custard-apple, cherimoya, sweetsop, ylang-ylang and soursop...
    
     — common pawpaw

• Asparagus
  Asparagus
  Asparagus officinalis is a spring vegetable, a flowering perennialplant species in the genus Asparagus. It was once classified in the lily family, like its Allium cousins, onions and garlic, but the Liliaceae have been split and the onion-like plants are now in the family Amaryllidaceae and...
  
  
  • X Asparagus officinalis — garden asparagus, asparagus-fern

• Asperugo
  • X Asperugo procumbens — German madwort, catchweed

• Asperula
  Asperula
  Asperula is a genus of flowering plants in the Rubiaceae family. It contains about 200 species and has a wide distribution area from Europe, northern Africa, temperate and subtropicale Asia to Australasia.-Species:...
  
  
  • X Asperula arvensis — blue woodruff

• Asplenium
  Asplenium
  Asplenium is a genus of about 700 species of ferns, often treated as the only genus in the family Aspleniaceae, though other authors consider Hymenasplenium separate, based on molecular phylogenetic analysis of DNA sequences, a different chromosome count, and structural differences in the rhizomes...
  
  
  • N Asplenium platyneuron
    Ebony spleenwort
    left|thumbAsplenium platyneuron is a species of spleenwort with a peculiar distribution in two continents. In North America it is native almost throughout the eastern United States, and in the far southeast of Canada; there are also isolated small populations in New Mexico, Arizona and the West...
    
     — ebony spleenwort
  • N Asplenium rhizophyllum
    Asplenium rhizophyllum
    Asplenium rhizophyllum, the American Walking Fern, is a rare, low lying fern native to North America. It is a close relative of Asplenium ruprechtii which is found in East Asia and also goes by the common name of walking fern.-Description:The name walking fern was derived from the way the fern...
    
     — walking fern
  • N Asplenium ruta-muraria
    Asplenium ruta-muraria
    Asplenium ruta-muraria is a species of fern commonly known as wall-rue. In Germany, it is known as Mauerraute or Mauerstreifenfarn. It is a very small epipetric species, growing exclusively on limestone and other calcareous rocks. It is native to both Europe and eastern North America...
    
     — wall-rue
  • N Asplenium scolopendrium
    Hart's-tongue fern
    Asplenium scolopendrium, Hart's-tongue Fern is a fern in the genus Asplenium, of the Northern Hemisphere.-Distribution:...
    
     var. americanum — American Hart's-tongue fern Special Concern
  • N Asplenium trichomanes
    Asplenium trichomanes
    Asplenium trichomanes is a small fern in the spleenwort genus Asplenium. It is a widespread and common species, occurring almost worldwide in a variety of rocky habitats. It is a variable fern with several subspecies.-Description:It grows in tufts from a short rhizome...
    
     — maidenhair spleenwort
  • N Asplenium viride
    Asplenium viride
    Asplenium viride is known as the green spleenwort because of its green stipes and raches. This feature easily distinguishes this species from the very similar-looking maidenhair spleenwort, Asplenium trichomanes.-Nomenclature:...
    
     — green spleenwort

• Aster
  • N Aster alpinus
    Aster alpinus
    Aster alpinus is an ornamental plant native the mountains of Europe , with a subspecies native to Canada and the United States. It is a perennial forb having purple, pink or blue flowers belonging to the genus Aster.-Description: It grows to be about 6-12 inches...
    
     — alpine aster

• Astragalus
  Astragalus
  Astragalus is a large genus of about 3,000 species of herbs and small shrubs, belonging to the legume family Fabaceae, subfamily Faboideae. The genus is native to temperate regions of the Northern Hemisphere...
  
  
  • N Astragalus adsurgens — ascending milkvetch, rattle milkvetch, standing milkvetch
  • N Astragalus agrestis
    Astragalus agrestis
    Astragalus agrestis is a species of milkvetch known by the common names purple milkvetch, purple loco, and field milkvetch. It is native to much of western and northern North America from most of Canada to the southwestern United States, as well as eastern Asia...
    
     — field milkvetch, mile-vetch, cock's-head
  • N Astragalus alpinus
    Astragalus alpinus
    Astragalus alpinus is a species of flowering plant in the legume family known by the common name alpine milkvetch. It has a circumpolar distribution, occurring throughout the upper latitudes of the Northern Hemisphere. It is widespread in Eurasia...
    
     — alpine milkvetch
  • N Astragalus americanus — American milkvetch
  • N Astragalus australis — Indian milkvetch
  • N Astragalus canadensis
    Astragalus canadensis
    Astragalus canadensis is a common and widespread member of the milkvetch genus in the legume family, known commonly as Canadian milkvetch. The plant is found throughout Canada and the United States in many habitats including wetlands, woodlands, and prairies...
    
     — Canada milkvetch, Carolina milkvetch
  • X Astragalus cicer
    Astragalus cicer
    Native to Eastern Europe, the cicer milkvetch, Astragalus cicer – popularized and subsequently transported to areas in Southern Europe, North America, and South America – is a perennial angiosperm , or a plant that commonly lives for two or more years. Cicer milkvetch exhibits legume-like...
    
     — chickpea milkvetch
  • N Astragalus eucosmus — elegant milkvetch, pretty milkvetch
  • X Astragalus glycophyllos — wild liquorice
  • N Astragalus neglectus — Cooper's milkvetch
  • N Astragalus tenellus — pulse milkvetch, loose-flower milkvetch

At

• Athyrium
  Athyrium
  Athyrium is a genus of about 180 species of terrestrial ferns, with a cosmopolitan distribution.Athyrium species are used as food plants by the larvae of some Lepidoptera species including Small Angle Shades and Sthenopis auratus.-Species:There are about 180, including:-References:***...
  
  
  • N Athyrium filix-femina
    Athyrium filix-femina
    Athyrium filix-femina is a large, feathery species of fern native throughout most of the temperate Northern Hemisphere, where it is often abundant in damp, shady woodland environments and is often grown for decoration.The plant is caespitose Athyrium filix-femina (Lady Fern or Common Lady-fern)...
    
     var. angustum — northern lady fern
  • N Athyrium filix-femina var. cyclosorum — northwestern lady fern

• Atriplex
  Atriplex
  Atriplex is a plant genus of 100-200 species, known by the common names of saltbush and orache . The genus is quite variable and widely distributed. It includes many desert and seashore plants and halophytes, as well as plants of moist environments...
  
  
  • N Atriplex dioica — thickleaf orache, saline saltbush
  • N Atriplex glabriuscula — smooth orache, Scotland orache, glabrous orache, northeastern saltbush
  • X Atriplex heterosperma — two-scale orache
  • X Atriplex hortensis
    Atriplex hortensis
    Atriplex hortensis, also known as Garden Orache, Red Orach, Mountain Spinach, French Spinach, or simply "orache" or arrach, is a hardy, annual plant, with an erect, branching stem, varying in height from two to six feet, according to the variety and soil...
    
     — garden orache
  • X Atriplex oblongifolia — oblong-leaf orache
  • N Atriplex patula
    Atriplex patula
    Atriplex patula L. is a ruderal, circumboreal species of annual herbaceous plants in the genus Atriplex naturalized in many temperate regions....
    
     — spear orache, spreading orache, spearscale, halberdleaf orache, common orache
  • N Atriplex prostrata — thinleaf orache, triangle orache, fat-hen
  • X Atriplex rosea
    Atriplex rosea
    Atriplex rosea is a species of saltbush known by the common names tumbling saltbush, red orach, and tumbling orach. It is native to Eurasia but it is widespread elsewhere as an introduced species....
    
     — tumbling orache

Au

• Aureolaria
  • N Aureolaria flava — yellow false-foxglove
  • N Aureolaria pedicularia — fernleaf yellow false-foxglove
  • N Aureolaria virginica — downy false-foxglove

• Aurinia
  Aurinia
  Aurinia is a genus of flowering plant of the family Brassicaceae.-Species:There are three species in the genus.*Aurinia corymbosa*Aurinia petraea*Aurinia saxatilis...
  
  
  • X Aurinia saxatilis
    Aurinia saxatilis
    Aurinia saxatilis Aurinia saxatilis Aurinia saxatilis (Basket of Gold, Goldentuft alyssum, Golden Alyssum, Gold-dust, Golden-tuft alyssum, Golden-tuft madwort, Rock madwort; syn. Alyssum saxatile L., Alyssum saxatile L. var...
    
     — basket-of-gold, gold dust, gold alyssum

Av

• Avena
  Avena
  The oats are a genus of 10-15 species of true grasses . They are native to Europe, Asia and northwest Africa. One species is widely cultivated elsewhere, and several have become naturalized in many parts of the world...
  
  
  • X Avena fatua
    Avena fatua
    Avena fatua is a species of grass in the oat genus. It is known as the common wild oat. This oat is native to Eurasia but it has been introduced to most of the other temperate regions of the world. It is naturalized in some areas and considered a noxious weed in others...
    
     — wild oats
  • X Avena sativa — oats, cultivated oats
  • X Avena sterilis
    Avena sterilis
    Avena sterilis is a species of grass weed, and its seeds are edible.-External links:***...
    
     — animated oats

Ax

• Axyris
  • X Axyris amaranthoides — Russian pigweed, upright axyris