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. % 

 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. Ql — 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. % (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 Trim (Fig. 991.) figure <m.-Aristida tpda, x i.- 

 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. 



