Calycadenia oppositifolia
| Calycadenia oppositifolia | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Calycadenia |
| Species: | C. oppositifolia |
| Binomial name | |
| Calycadenia oppositifolia Greene | |
| Synonyms | |
|
Hemizonia oppositifolia | |
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 bracts 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.