Panicum vaseyanum Scribn. ex Beal

Panicum vaseyanum Scribn. ; Beal, Grasses N. Am. 2: 140
1896.
i
Plants spreading, branching at base and at the lower and middle nodes, glabrous throughout; culms 50-70 cm. long, somewhat compressed; leaf-sheaths shorter than the elongate internodes; ligule 1-2 mm. long; blades 5-20 cm. long, 3-7 mm. wide, linear, scarcely narrowed at the folded or enveloping base; panicles terminal and from the axils of the upper leaves of the main culms and large branches, narrow, 4-7 cm. long, less than 1 cm. wide, partially included, equaled or exceeded by the erect uppermost blade; spikelets short-pediceled, narrowly ovate, 2.5 mm. long, 1.1-1.2 mm. wide, subacute; first glume about one fifth the length of the spikelet, truncate or obtuse; second glume slightly shorter than the sterile lemma, both 7-nerved, the palea of the sterile floret obsolete; fruit 2.1 mm. long, 1 mm. wide, elliptic, apiculate.
Type locality: Base of Sierra Madre, Chihuahua. Distribution: Chihuahua to Jalisco.