MANUAL OF THE GRASSES OF THE UNITED STATES 



479 



Figuke 702. — Aristida rhizomophora. Plant, X 14; 

 spikelet, X 2; two views of callus, X 10. (Type.) 



Dry or rocky soil, Nevada, Arizona, 

 and southern California. 



34. Aristida affinis (Schult.) 

 Kunth. (Fig. 705.) Perennial; culms 

 tufted from a hard thickened base, 

 stiffly erect, rather stout, 1 to 1.5 m. 

 tall; blades flat, becoming loosely in- 

 volute, 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; cen- 

 tral 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 Caro- 

 lina and Kentucky to Florida and 

 Texas, mostly on the Coastal Plain. 



Figuke 703. — Aristida purpurascens, 

 4563, N. C.) 



X 1. (Chase 



