Ambrosia acanthicarpa

Ambrosia acanthicarpa is a North American species of bristly annual plants in the sunflower family. Members of the genus Ambrosia are called ragweeds. The species has common names including flatspine bur ragweed,[2] Hooker's bur-ragweed,[3] annual burrweed, annual bur-sage, and western sand-bur. The plant is common across much of the western United States and in the Prairie Provinces of Canada.[4][5]

Ambrosia acanthicarpa
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Ambrosia
Species:
A. acanthicarpa
Binomial name
Ambrosia acanthicarpa
Synonyms[1]
  • Franseria acanthicarpa (Hook.) Coville
  • Franseria californica Gand.
  • Franseria hookeriana Nutt.
  • Franseria montana Nutt.
  • Franseria palmeri Rydb.
  • Gaertneria acanthicarpa (Hook.) Britton
  • Gaertneria hookeriana (Nutt.) Kuntze

This spiny, weedy plant grows in clumps of many erect stems which may reach over a meter in height. Its gray-green stems are covered in a coat of stiff, bristly hairs. The few rough leaves are several centimeters long. The racemes of flowers are more plentiful, with each hairy flower head a few millimeters wide. The spiny, burr-like pistillate heads have pointed, twisting bracts and the staminate heads are rounded. The species is adaptable and grows well in disturbed areas, easily becoming weedy.[6]

References
  1. The Plant List Ambrosia acanthicarpa Hook.
  2. USDA, NRCS (n.d.). "Ambrosia acanthicarpa". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 8 January 2016.
  3. BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
  4. Biota of North America Program 2013 county distribution map
  5. Great Plains Flora Association. 1986. Flora of the Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
  6. Flora of North America Vol. 21 Page 15 Ambrosia acanthicarpa Hooker, Fl. Bor.-Amer. 1: 309. 1833.


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