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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.
Synonyms[1]
  • 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

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


Xanthisma gracile has extra chromosomes that do not have any functional genes (B chromosomes), and about which little is known.[4]


References


  1. "Xanthisma gracile". Global Biodiversity Information Facility. Retrieved 3 July 2021.
  2. Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. p. 314
  3. USDA, NRCS (n.d.). "Machaeranthera gracilis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 26 June 2015.
  4. Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. 2013, p. 218



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