Ambrosia acanthicarpa

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Heliantheae
Subtribus: Ambrosiinae
Genus: Ambrosia
Species: Ambrosia acanthicarpa
Name

Ambrosia acanthicarpa Hook., Fl. bor.-amer. 1:309. 1833
Synonyms

Franseria acanthicarpa (Hook.) Coville
Franseria hookeriana Nutt.
Franseria montana Nutt.
Gaertneria acanthicarpa (Hook.) Britt.
Gaertneria hookeriana (Nutt.) Kuntze
Hemixanthidium montanum (Nutt.) Delpino

Distribution
Native distribution areas:
References

Hook., Flora Boreali-Americana (Hooker) 1(6): 309. 1833.
USDA, NRCS. 2006. The PLANTS Database, 6 March 2006 (http://plants.usda.gov).

Links

International Plant Names Index. 2018. Ambrosia acanthicarpa. Published online. Accessed: January 29 2018.
The Plant List 2013. Ambrosia acanthicarpa in The Plant List Version 1.1. Published on the internet. Accessed: 2018 January 29.
Tropicos.org 2018. Ambrosia acanthicarpa. Missouri Botanical Garden. Published on the internet. Accessed: 2018 January 29.
Hassler, M. 2018. Ambrosia acanthicarpa. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 January 29. Reference page.
USDA, ARS, Germplasm Resources Information Network. Ambrosia acanthicarpa in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
English: flatspine burr ragweed

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]

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

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