Achnatherum occidentale

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Achnatherum occidentale
Achnatherum occidentale ssp occidentale (as Stipa occidentale) LS-1899.png
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Poaceae
Genus: Achnatherum
Species: A. occidentale
Binomial name
Achnatherum occidentale
(Thurb.) Barkworth

Achnatherum occidentale is a species of grass known by the common name western needlegrass. It is native to western North America from British Columbia to California to Colorado, where it grows in many types of habitat. This is a tufting perennial bunchgrass forming tight clumps of erect stems up to about 120 centimetres (47 in) in maximum height, but sometimes much shorter. The hairlike leaves are less than a millimeter wide and may have rolled edges. The inflorescence is up to 30 centimetres (12 in) long, with each hairy spikelet bearing an awn up to 4 or 5 centimeters long. The awn is kinked twice.[1]


  1. ^ "Achnatherum occidentale". Grass Manual Treatment. Archived from the original on June 11, 2011. Retrieved July 27, 2008. 

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