Xanthisma gracile[2] is a species of annual flowering plant in the family Asteraceae known by the common names slender goldenweed[3] and annual bristleweed.[4]
| Xanthisma gracile | |
|---|---|
| |
Scientific classification 
| |
| 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.
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| Synonyms[1] | |
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Range and habitat
editIt is native the southwestern United States and northern Mexico, where it grows in the deserts and plateaus.
Growth pattern
editIt is a bristly annual herb growing erect up to 45 cm tall.
Leaves and stems
editThe oval or oblong leaves are 1–3 cm long and divided into lobes or teeth tipped with bristles.
Flowers and fruit
editThe 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.
Genetics
editXanthisma gracile has extra chromosomes that do not have any functional genes (B chromosomes), and about which little is known.[4]
References
edit- ^ "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
External links
edit
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