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 aster or sunflower family (Asteraceae) known by the common names slender goldenweed[3] and annual bristleweed.[4]
Range and habitat[]
It is native the southwestern United States and northern Mexico, where it grows in the deserts and plateaus.
Growth pattern[]
It is a bristly annual herb growing erect up to 45 cm tall.
Leaves and stems[]
The oval or oblong leaves are 1-3 cm long and divided into lobes or teeth tipped with bristles.
Flowers and fruit[]
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[]
X. gracile has extra chromosomes that do not have any functional genes (B chromosomes), and about which little is known.[4]
References[]
- ^ "Xanthisma gracile". Global Biodiversity Information Facility. Retrieved 3 July 2021.
- ^ Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. p. 314
- ^ "Machaeranthera gracilis". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 26 June 2015.
- ^ Jump up to: a b Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. 2013, p. 218
External links[]
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- Astereae
- Flora of Mexico
- Flora of the Western United States
- Flora of the California desert regions
- Taxa named by Thomas Nuttall
- Plants described in 1848
- Astereae stubs