Xanthisma gracile
{{Short description|Species of flowering plant}}
{{Speciesbox
| image = Xanthisma gracile by Andrey Zharkikh.jpg
| status = G5
| status_system = TNC
| status_ref = {{Cite NatureServe|date=3 January 2025|id=2.155866|title=Xanthisma gracile | NatureServe Explorer|access-date=10 January 2025}}
| genus = Xanthisma
| species = gracile
| authority = (Nutt.) D.R.Morgan & R.L.Hartm.
| synonyms =
- 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
| synonyms_ref = {{GBIF |id=3150453 |taxon=Xanthisma gracile |accessdate=3 July 2021}}
}}
Xanthisma gracileMojave Desert Wildflowers, Pam MacKay, 2nd Ed. p. 314 is a species of annual flowering plant in the family Asteraceae known by the common names slender goldenweed{{PLANTS|id=MAGR10|taxon=Machaeranthera gracilis|access-date=26 June 2015}} and annual bristleweed.Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. 2013, p. 218
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.
References
{{Reflist}}
External links
- [http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?609,1560,1572 Jepson Manual Treatment]
- [http://plants.usda.gov/java/profile?symbol=MAGR10 USDA Plants Profile]
- [http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250067826 Flora of North America]
- [http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Machaeranthera+gracilis UC Photos gallery]
{{Taxonbar|from=Q15571877}}
Category:Flora of the Western United States
Category:Flora of the California desert regions
Category:Taxa named by Thomas Nuttall
Category:Plants described in 1848
{{Astereae-stub}}