Xanthisma gracile (original) (raw)
From Wikipedia, the free encyclopedia
Species of flowering plant
| Xanthisma gracile | |
|---|---|
 |
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| Conservation status | |
 Secure (NatureServe)[1] |
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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: | Xanthisma |
| Species: | X. gracile |
| Binomial name | |
| Xanthisma gracile(Nutt.) D.R.Morgan & R.L.Hartm. | |
| Synonyms[2] | |
| Aster dieteria Kuntze Dieteria gracilis Nutt. Eriocarpum gracile (Nutt.) Greene Haplopappus gracilis (Nutt.) A.Gray Haplopappus ravenii R.C.Jacks. Machaeranthera gracilis (Nutt.) Shinners Sideranthus gracilis (Nutt.) A.Nelson |
Xanthisma gracile[3] is a species of annual flowering plant in the family Asteraceae known by the common names slender goldenweed[4] and annual bristleweed.[5]
It is native the southwestern United States and northern Mexico, where it grows in the deserts and plateaus.
It is a bristly annual herb growing erect up to 45 cm tall.
The oval or oblong leaves are 1–3 cm long and divided into lobes or teeth tipped with bristles.
The inflorescence bears one or more flower heads lined with pointed, roughly hairy phyllaries. The head has a center of many yellow disc florets and a fringe of 16 to 18 yellow ray florets roughly a centimeter long. The fruit is a woolly achene 2 to 3 millimeters long tipped with a pappus.
Xanthisma gracile has extra chromosomes that do not have any functional genes (B chromosomes), and about which little is known.[5] Its chromosome count is given as 2n=4 by Munz and Keck.[6]
- ^ NatureServe (3 January 2025). "Xanthisma gracile | NatureServe Explorer". NatureServe Explorer. Arlington, Virginia. Retrieved 10 January 2025.
- ^ "Xanthisma gracile". Global Biodiversity Information Facility. Retrieved 3 July 2021.
- ^ Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. p. 314
- ^ NRCS. "Machaeranthera gracilis". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 26 June 2015.
- ^ a b Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. 2013, p. 218
- ^ Munz, Philip A.; Keck, David D. (1959). A California Flora. Berkeley, Calif.: Univ. of Calif. Press. p. 1174.