Calycadenia oppositifolia
Encyclopedia
Calycadenia oppositifolia is a species of flowering plant in the daisy family
known by the common name Butte County western rosinweed. It is endemic to Butte County, California
, where it grows in the foothills of the high mountain ranges. This is an annual herb producing an erect, unbranching, hairy stem approaching 30 centimeters in maximum height. The leaves are linear in shape and up to 5 centimeters long, arranged oppositely about the stem. The inflorescence
bears bract
s coated in large resin glands and dense clusters of flower heads
. The hairy, glandular flower head has a center of several disc florets surrounded by a few white or reddish triple-lobed ray florets. Each ray floret has three lobes at the tip, the middle lobe being shortest. The fruit is an achene
; those developing from the disc florets have a pappus
of scales.
Asteraceae
The Asteraceae or Compositae , is an exceedingly large and widespread family of vascular plants. The group has more than 22,750 currently accepted species, spread across 1620 genera and 12 subfamilies...
known by the common name Butte County western rosinweed. It is endemic to Butte County, California
Butte County, California
Butte County is a county located in the Central Valley of the US state of California, north of the state capital of Sacramento. As of the 2010 census, it had a population of 220,000. The county seat is Oroville. Butte County is the "Land of Natural Wealth and Beauty."Butte County is watered by the...
, where it grows in the foothills of the high mountain ranges. This is an annual herb producing an erect, unbranching, hairy stem approaching 30 centimeters in maximum height. The leaves are linear in shape and up to 5 centimeters long, arranged oppositely about the stem. 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...
bears bract
Bract
In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis, or cone scale. Bracts are often different from foliage leaves. They may be smaller, larger, or of a different color, shape, or texture...
s coated in large resin glands and dense clusters of flower heads
Head (botany)
The capitulum is considered the most derived form of inflorescence. Flower heads found outside Asteraceae show lesser degrees of specialization....
. The hairy, glandular flower head has a center of several disc florets surrounded by a few white or reddish triple-lobed ray florets. Each ray floret has three lobes at the tip, the middle lobe being shortest. The fruit is an achene
Achene
An achene is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate and indehiscent...
; those developing from the disc florets have a pappus
Pappus (flower structure)
The pappus is the modified calyx, the part of an individual disk, ray or ligule floret surrounding the base of the corolla, in flower heads of the plant family Asteraceae. The pappus may be composed of bristles , awns, scales, or may be absent. In some species, the pappus is too small to see...
of scales.