MANUAL OF THE GRASSES OF THE UNITED STATES 



457 



FIGURE 982. Distribution of 

 Aristida arizonica. 



FIGURE 981. Aristida arizonica, 

 (Rusby, Ariz.) 



base, slender, 40 to 70 cm or even 1 m tall; blades flat, rather lax 



and flexuous (especially the old ones), 

 usually less than 2 mm wide; panicle 

 narrow, rather lax and nodding, one- 

 third to half the entire length of the 

 culm; glumes about equal, 9 to 12 mm 

 long; lemma about 7 mm long; awns 

 about equal, divergent or somewhat 

 reflexed, 1.5 to 2.5 cm long. 21 

 Dry sandy soil, 

 Massachusetts 

 to Kansas, 

 south to Florida 

 and Texas (fig. 

 987). 



33. Aristida 

 parishii Hitchc. 

 (Fig. 988.) Per- 

 ennial; culms erect, 30 to 50 cm tall; 

 blades more or less involute, some- 

 times flat, 1 to 2 mm wide; panicle 

 narrow, about 15 cm long; glumes 

 short-awned, the first 12 mm long, 

 the second 1 or 

 x i; 2 mm longer; 

 lemma about 12 



mm long, tapering into a short straight or 



obscurely twisted beak; awns about equal, 



divergent, about 2.5 cm long. 21 Dry or 



rocky soil, Arizona and southern California. 



34. Aristida affinis (Schult.) Kunth. (Fig. 

 989.) Perennial; culms tufted from a hard 

 thickened base, stiffly erect, rather stout, 1 to 



1.5 m tall; blades flat, 



becoming loosely invo- 

 lute, elongate, as much 



as 3 mm wide; panicle 



narrow, virgate, as 



much as 50 cm long; 



glumes equal, about 12 



mm long, the first with 



a distinct nerve on one 



side (thus 2-nerved); lemma 8 mm long, the 

 straight beak about 1 mm long; central awn 

 horizontally spreading, 1.5 to 3 cm long, the 

 lateral awns erect, two-thirds to three-fourths 

 as long. 01 (A. palustris Vasey.) Low pine 

 barrens and flatwoods, North Carolina and 

 Kentucky to Florida and Texas, on the Coastal 

 Plain (fig. 990). 



35. Aristida virgata Trin. (Fig. 991.) 

 Perennial; culms tufted from a rather slender 



soft base, erect, 50 to 80 cm tall; blades flat, rather lax, usually not 



FIGURE 984. Distribution of 

 Aristida stricta. 



