MANUAL OF THE GRASSES OF THE UNITED STATES 



455 



and the shorter awns (2 to 5 cm long). % — Dry plains and hills, 

 South Dakota to Montana, south to Texas, Utah, and southern 

 California (fig. 978). 



28. Aristida lanosa Muhl. (Fig. 979.) Perennial; culms solitary or 

 few in a tuft, rather robust, 1 to 1.5 m tall; sheaths lanate-pubescent 

 or rarely glabrous; blades flat, elongate, as much as 4 mm wide; 

 panicle narrow, rather loose, as much as 40 cm long; first glume 12 to 



Figure 975.— Aristida longiseta, X 1. (Thompson 63, Kan.) 



14 mm long, the second about 10 mm, lemma 8 to 9 mm long; central 

 awn horizontally spreading or reflexed from a curved base, 1.5 to 2.5 

 cm long, the lateral half to two-thirds as long, erect or spreading. % ■ — 

 Dry sandy soil of the Coastal Plain, New Jersey to Florida and Texas, 

 north to Oklahoma and Missouri (fig. 980). 



29. Aristida arizonica Vasey. Arizona three-awn. (Fig. 981.) 

 Perennial; culms erect, 30 to 120 cm tall; blades flat, narrowed to a 



fine involute point or some of them involute 

 throughout, 1 to 4 mm wide, the old ones 

 usually curled or flexuous; panicle narrow, erect, 

 closely flowered or more or less interrupted at 

 base, 10 to 25 cm long; glumes equal or nearly 

 so, awn-pointed, 10 to 15 mm long; lemma 

 1 to 1.5 cm long, including the more or less 

 twisted beak of about 3 to 5 mm; awns about 

 equal, ascending, 1 to 2 cm long. 91 — Dry 

 plains, stony hillsides, and open forest, mostly at 1,500 to 2,500 m 

 altitude, southern Colorado, western Texas, New Mexico, and Arizona, 

 south through Mexico (fig. 982). 



30. Aristida stricta Michx. Pineland three-awn. (Fig. 983.) 

 Perennial; culms erect, 50 to 100 cm tall; blades closely involute, 

 villous on the upper surface above the base (the hairs visible without 

 unrolling the blade), elongate, 1 mm thick; panicle slender, as much 

 as 30 cm long; glumes about equal, 7 to 9 mm long; lemma about 6 



Figure 976.— Distribution of 

 Aristida longiseta. 



