204 



Fig. 500. Bouteloua polystachya (]5entli.) Torr. in Pjicif. 

 Rail. Rep. 5 : 3(16, t. 10. 1857. {Chvudrosimti itohji^taLhyum 

 Benth. Bot. A^oy. Sulpli. 56. 1844.) Six-weeks Grama.— A 

 Kleiidcr and diffusely fsprcading, miioh-brancbed animal, 1 to 4 

 dm. high, Avitii short, narroiv leaves and 3 to 6 linear spikes 

 about 2 cm. Ion-;, approximate near the apex of the culm or its 

 branches. Spikelets with glabrous, uueqnal empty glumes (a), 

 the larger second one 1.5 mm. long, and 4-lobed ilowcring 

 glumes (//), which are awned between the lobes and ciliate on 

 the nerves.— River valleys, etc., Utah to Texas and westward 

 to southern tJalifornia. [Mexico.] .July-September. 



