MANUAL OF THE GRASSES OF THE UNITED STATES 



455 



and the shorter awns (2 to 5 cm long). 21 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. 91 

 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. 21 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. 



