Xanthisma gracile
| Xanthisma gracile | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Embryophytes |
| Clade: | Tracheophytes |
| Clade: | Spermatophytes |
| 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] | |
| |
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]
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.[5] Its chromosome count is given as 2n=4 by Munz and Keck.[6]
References
[edit]- ↑ 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.
- 1 2 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.
External links
[edit]
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