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Xanthisma gracile

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Xanthisma gracile

Secure  (NatureServe)
Scientific classification Edit this 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

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

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It is native the southwestern United States and northern Mexico, where it grows in the deserts and plateaus.

Growth pattern

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It is a bristly annual herb growing erect up to 45 cm tall.

Leaves and stems

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The oval or oblong leaves are 1–3 cm long and divided into lobes or teeth tipped with bristles.

Flowers and fruit

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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

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

References

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  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. ^ a b Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. 2013, p. 218
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