Potamogeton gramineus
Encyclopedia
Potamogeton gramineus is a species of aquatic plant
known by the common name variableleaf pondweed. It is native to much of the Northern Hemisphere, where it grows in water bodies such as ponds, lakes, bogs, and streams. It may be found elsewhere as an introduced species
. This is a perennial herb growing from a matted rhizome
that anchors in wet substrate. It produces a thin, cylindrical or flattened stem growing over a meter in maximum length with several short branches. Leaves growing underwater are narrow and linear in shape and up to 11 centimeters long. Floating leaves are more oval in shape, up to 7 centimeters long by 3 wide, and borne on long petioles
. The inflorescence
is a short spike of many flowers arising from the water on a stout peduncle
. This species readily hybridizes with many other species of Potamogeton
.
Aquatic plant
Aquatic plants are plants that have adapted to living in aquatic environments. They are also referred to as hydrophytes or aquatic macrophytes. These plants require special adaptations for living submerged in water, or at the water's surface. Aquatic plants can only grow in water or in soil that is...
known by the common name variableleaf pondweed. It is native to much of the Northern Hemisphere, where it grows in water bodies such as ponds, lakes, bogs, and streams. It may be found elsewhere as an introduced species
Introduced species
An introduced species — or neozoon, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its indigenous or native distributional range, and has arrived in an ecosystem or plant community by human activity, either deliberate or accidental...
. This is a perennial herb growing from a matted rhizome
Rhizome
In botany and dendrology, a rhizome is a characteristically horizontal stem of a plant that is usually found underground, often sending out roots and shoots from its nodes...
that anchors in wet substrate. It produces a thin, cylindrical or flattened stem growing over a meter in maximum length with several short branches. Leaves growing underwater are narrow and linear in shape and up to 11 centimeters long. Floating leaves are more oval in shape, up to 7 centimeters long by 3 wide, and borne on long petioles
Petiole (botany)
In botany, the petiole is the stalk attaching the leaf blade to the stem. The petiole usually has the same internal structure as the stem. Outgrowths appearing on each side of the petiole are called stipules. Leaves lacking a petiole are called sessile, or clasping when they partly surround the...
. The inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...
is a short spike of many flowers arising from the water on a stout peduncle
Peduncle (botany)
In botany, a peduncle is a stem supporting an inflorescence, or after fecundation, an infructescence.The peduncle is a stem, usually green and without leaves, though sometimes colored or supporting small leaves...
. This species readily hybridizes with many other species of Potamogeton
Potamogeton
Potamogeton is a genus of aquatic, mostly freshwater, plants of the family Potamogetonaceae. Most are known by the common name pondweed, although many unrelated plants may be called pondweed, such as Canadian pondweed...
.