MANUAL OF THE GRASSES OF THE UNITED STATES 



471 



Figure 685. — Aristida adsceiisionis, X 1. (Earle 559, 

 N. Mex.) 



vergent, nearly equal, 15 to 20 mm. 

 long. % (A. havardii Vasey.) — 

 Hills and plains, western Texas to 

 Arizona and central Mexico. 



17. Aristida divaricata Humb. and 

 Bonpl. ex Willd. Poverty three- 

 awn. (Fig. 688.) Perennial; culms 

 erect or prostrate-spreading, usually 

 30 to 60 cm. long, sometimes longer; 

 blades flat or usually loosely involute, 

 or the basal closely involute, mostly 

 less than 3 mm. wide; panicle large, 

 diffuse, usually as much as half the 

 entire length of the culm, the branches 

 spreading or reflexed, naked below; 

 glumes nearly equal, 1 cm. long; 

 lemma 1 cm. long, narrowed into a 

 twisted beak 2 to 5 mm. long; awns 

 about equal, 10 to 15 mm. long. % 

 — Dry hills and plains, Kansas to 

 southern California, south to Texas 

 and Guatemala. 



18. Aristida hamulosa Henr. (Fig. 

 689.) Resembling A. divaricata; lem- 



Figure 686. — Aristida intermedia, X 1. (Kearney 

 236, Miss.) 



ma somewhat narrowed at summit 

 but not twisted, central awn a little 

 longer than the two lateral ones. % 

 — Dry hills and plains, western 

 Texas to southern California, south 



Figure 687. — Aristida barbata, X 1. (Wooton, 

 N. Mex.) 



