23 



Fig. 319. Andropogon hallii Hack. Sitzuiigsber. Ak. Wiss. 

 \\'i(n,89: 127. 18^1. Colohado Sand-guass. A stout, glabrous 

 [leirunial 1 to 10 dm. or nioio liij;h, with leather louj;- (tlio lower 10 

 to I'O cm.), Hat leaves aud stout racemes whicli are in pairs or iu 

 threes aud 5 to 8 ciu. 1oii;l;'. Sessile spikelet () aliout S iimi. louj;, 

 with the first glume {h) ciliate alor.j^ the keels aud pilose-hairy 

 toward the apex. .\wn shorter thau th(i spikelet or wautiuj^. 

 Dry saudy soil, North Dakota, Moiitaua, soiithwnrd lo Kausas, 

 Texas, and New Mexico. [Mexico.] .Jiily-Sejitemher. 



