Calycadenia oppositifolia is a species of flowering plant in the family Asteraceae known by the common name Butte County western rosinweed. It is native primarily to Butte County, California, although a few populations have been found in other parts of the state.[3] It grows in the foothills of the high mountain ranges.
| Calycadenia oppositifolia | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Calycadenia |
| Species: | C. oppositifolia
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| Binomial name | |
| Calycadenia oppositifolia | |
| Synonyms[2] | |
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Description
editCalycadenia oppositifolia is an annual herb producing an erect, unbranching, hairy stem approaching 30 centimeters (12 inches) in maximum height. The leaves are linear in shape and up to 5 centimeters (2 inches) 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.[4]
References
editExternal links
edit- Jepson Manual Treatment
- United States Department of Agriculture Plants Profile
- photo of herbarium specimen at Missouri Botanical Garden, isotype of Calycadenia oppositifolia/Hemizonia oppositifolia
- Calphotos Photo gallery, University of California
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