472 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



third to half the entire length of the 

 culm, the branches drooping, naked 

 below, as much as 20 cm. long; 

 glumes 12 to 15 mm. long, nearly 

 equal; lemma 10 to 12 mm. long; 

 central awn straight, 2 to 2.5 cm. 

 long, the lateral scarcely diverging, 

 5 to 10 mm. long. % — Moist 

 sandy pine barrens and low open 

 ground, peninsular Florida. 



20. Aristida pansa Woot. and 

 Standi. Wooton three-awn. (Fig. 

 691.) Perennial; culms stiffly erect, 

 slender, wiry, 20 to 40 cm. tall; 

 blades closely involute, 0.5 mm. thick, 

 often flexuous; panicle rather nar- 



Figure 688. — Aristida divaricata, X 1. (Talbot, 

 N. Mex.) 



to Guatemala. In Arizona more 

 common than A. divaricata. 



19. Aristida patula Chapm. ex 

 Nash. (Fig. 690.) Perennial, erect, as 

 much as 1 m. tall; blades flat, be- 

 coming involute especially at the 

 slender tip, elongate, 2 to 4 mm. 



Wide; panicle loOSe and Open, One- Figure 690.— Aristida patula, X 1. (Hitchcock, Fla.) 



Figure 689. — Aristida hamulosa. Panicle, X 1; floret, X 3. (Type.) 



