Vascular Plants of the Gila Wilderness

Presented in Association with the
Western New Mexico University Department of Natural Sciences

Andropogon gerardii Vitmann
(Big Bluestem)


Family: Poaceae

Status: Native

Synonyms:
Andropogon chrysocomus Nash
Andropogon furcatus Muhl. ex Willd.
Andropogon gerardii Vitman var. chrysocomus (Nash) Fernald
Andropogon provincialis Lam.

Andropogon gerardii is purplish red appearing grass that grows to 3 or 4 feet tall. The spikelets have awns and come as pairs, with one spikelet sessile and one on a pedicel. The pedicellate spikelet in Andropogon gerardii is almost as large as the sessile one at full maturity. The pedicel is round in cross section. The inflorescence branches seem to come off in pairs or threes. Andropogon gerardii is found at roadside at middle elevation.
Please click on an image for a larger file.



Andropogon gerardii, photo Russ Kleinman & Bill Norris, Hwy 90 0.7 miles south of Tyrone, October 6, 2011



Andropogon gerardii, closeup, photo Russ Kleinman & Bill Norris, Hwy 90 0.7 miles south of Tyrone, October 6, 2011



Andropogon gerardii, closeup, photo Russ Kleinman & Bill Norris, Hwy 90 0.7 miles south of Tyrone, October 6, 2011



Andropogon gerardii, 5x macro of nearly round pedicel cross section, photo Russ Kleinman & Bill Norris, Hwy 90 0.7 miles south of Tyrone, October 6, 2011



Andropogon gerardii, 2x macro of spikelet pair, photo Russ Kleinman & Bill Norris, Hwy 90 0.7 miles south of Tyrone, October 6, 2011


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