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



1 -nerved on each side, this extending into a single straight or diver- 

 gent scabrous nearly terete awn, the obsolete or minute lateral awns 

 about 17 mm above the lemma, the central awn 10 to 15 mm long. 



9[ (A. scabra Kunth.) — Rocky hills and 

 dry plateaus, New Mexico and Arizona to 

 northern South America; Bahamas, 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. 91 (A. 

 divergens Vasey.) — Rocky hills and plains, 

 Texas, New Mexico, Arizona; Nicaragua. 

 6. Aristida floridana (Chapm.) Vasey. 

 (Fig. 940.) Resembling A. ternipes, but 

 differing in having a narrow panicle with 

 ascending branches 3 to 5 cm long, spike- 

 let-bearing nearly to the base ; awns sickle- 

 shaped, the column somewhat twisted. 91 

 — Known only from the original collection 

 from Key West, Fla. 

 7. Aristida orcuttiana Vasey. Beggartick grass. (Fig. 941.) 

 Perennial; culms erect, 30 to 60 cm or even 1 m tall; blades flat or the 

 upper involute, as much as 3 mm wide; panicle open, as much as 30 



Figure 939.— Aristida ternipes, 

 (Griffiths 7271, Ariz.) 



Figure 940.— Aristida floridana, X 1. 

 (Blodgett, Fla.) 



Figure 941.— Aristida orcuttiana. Panicle, X 1; 

 floret, X 2. (Smith, N.Mex.) 



cm long, nodding or drooping, the branches few, distant, spreading 

 or drooping, as much as 20 cm long; glumes equal or nearly so,^ 10 to 

 15 mm long; lemma 8 to 10 mm long, gradually narrowed into a 



