204 
b 
Fic. 500. BOUTELOUA POLYSTACHYA (Benth.) Torr. in Pac. R. R. ee ^ 
52: 366, pl. 10. 1857. (Chondrosium polystachyum Benth. Bot. Voy. SUP 
GRA ff 
1844) SIX-WEEKS MA.—A slender and diffusely spreading; pe | 
bran nnual, 1-4 dm. (4'-16/) high, with short, narrow leaves age 
linear spikes about 2 cm, (4^) long, approximate near the apex of the ¢ larger 
its branches. Spikelets with glabrous, unequal em E (a), the h 
second one 1.5 mm. (% long, and 4-lo flowering glumes (b), M 
awned be he lobes and ciliate on the es 7 and 
shown by d and the palea by c.—River valleys, etc., Utah 
ward to southern California. (Mexico.) July to September. 
