Xanthisma gracile
| 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.
| |
| Synonyms[1] | |
| |
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]
Range and habitat
[edit]It is native the southwestern United States and northern Mexico, where it grows in the deserts and plateaus.
Growth pattern
[edit]It is a bristly annual herb growing erect up to 45 cm tall.
Leaves and stems
[edit]The oval or oblong leaves are 1–3 cm long and divided into lobes or teeth tipped with bristles.
Flowers and fruit
[edit]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.
Genetics
[edit]Xanthisma 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
- ^ USDA, NRCS (n.d.). "Machaeranthera gracilis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 26 June 2015.
- ^ a b Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. 2013, p. 218
External links
[edit]
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