Bouteloua annua Swallen

Bouteloua annua Swallen, Jour. Wash. Acad. 25: 414. 1935
Annual; culms in dense clumps, branching, erect or geniculate-spreading at the base, 3-25 cm. tall; sheaths shorter than the internodes, glabrous; ligule ciliate, 0.2 mm. long; blades flat, 1-3.5 cm. long, 1.5-2 mm. wide, acute, pubescent on the upper surface or nearly glabrous; spikes 2-7, falling entire, rather distant, ascending or spreading, 1.5-2 cm. long, bearing 4-7 usually appressed, green or purple spikelets; glumes acuminate, scabrous on the keel, the first narrow, 3.5-4 mm. long, the second much broader, 6-7 mm. long; lemma 7-9 mm. long, 3-toothed, densely pubescent at the base, pilose in lines on both sides of the midnerve and on the margins; rudiment cleft to the base, the lobes with their awns 5-7 mm. long, sparsely appressed-pilose in lines along the nerves, the rachilla appressed-pilose on the margins.
Type locality: San Ignacio, Baja California (Shreve). Distribution: Known only from the type locality.

Bouteloua annua là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Swallen mô tả khoa học đầu tiên năm 1935.