46G 



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



Figure 676.- 



-Aristida ternipes, X 1. (Griffiths 7271, 

 Ariz.) 



or minute lateral awns about 1.7 mm. 

 above the lemma, the central awn 10 

 to 15 mm. long. % (A. scabra 

 Kunth.) — Rocky hills and dry pla- 

 teaus, Texas, New Mexico, and Ari- 

 zona to northern South America; Ba- 

 hamas, Cuba. Aristida ternipes 

 var. minor (Vasey) Hitchc. Smaller 

 and often prostrate or ascending, the 

 panicle usually more than half the 

 length of the entire plant, less diffuse, 

 the shorter branches usually stiffly 

 spreading or somewhat deflexed. % 

 (A. divergens Vasey.) — Rocky hills 

 and plains, Texas to Arizona; Nic- 

 aragua. 



Figure 677. — Aristida floridana, X 1. (Blodgett, Fla.) 



6. Aristida floridana (Chapm.) 



Vasey. (Fig. 677.) Resembling A. 

 ternipes, but differing in having a nar- 

 row panicle with ascending branches 

 3 to 5 cm. long, spikelet-bearing 

 nearly to the base; awns sickle- 

 shaped, the column somewhat twist- 

 ed. % — Known only from the 

 original collection from Key West, 

 Fla. 



Figure 678. — Aristida orcuttiana. Panicle, X 1: floret, X 2. (Smith, N. Mex.) 



