204 roACE.E. 



body of the first glume 10-12 mm. long, of the second 13-15 mm. 

 long; floret nearly 1 em. long, with the lutenil divergent awns as 

 long as the floret, the middle one a third or more longer; palea 

 about 1 mm. long. 



Florida, Ci(rh'i<s 3430; Mississipj)!, I'racy; Maryland, Canby, 

 Chd-k- Ii)84 from Canby. 



Delaware to Texas. 



20. A. stricta Miohx. Fl. lior. Am. 1:41(1803). Chcetaria 

 stn'cta Heauv. Agrost. 30 (1812). 



A slender striet perennial, 00-90 cm. high. Culms with about 

 three nodes. Sheaths half as long as the interuodes; ligule very 

 short; blades involute, setaceous, downy, 10-40 cm. long. Panicle 

 spikelike, interrupted, very slender, about 30 cm. long; rays appar- 

 ently 2-3 together, some of the longest 5-0 cm. long, bearing a few 

 flowers above the middle. Empty glumes scabrous on the keels, 

 bifid, bearing an awn 2-4 mm. long, first glume (not including its 

 awn) 7 mm. long, second 2-4 mm. long; floret as long as the sec- 

 ond glume; the lateral divergent awns over 10 mm. long, the cen- 

 tral one a little longer. 



Florida, CurtisH 3420; Georgia, Tracy; Mississippi, Tmcy. 



Virginia to Florida and Alabama; iilso in West Indies and Cuba. 



Var. condensata (Chapm.) Vasey, Contrib. U. S. Nat. Herb. 

 3:45 (1892). A. condensata Chapm. Coult. Bot. (Jaz. 3:19 

 (1878). 



Leaf-blades rigid, soon convolute, those of the sterile shoots 30- 

 50 cm. long. Panicle contracted, densely many-tlowered, 30-45 

 cm. long; empty glumes subequal, about 9 mm. long; awns 10 

 mm. long. 



Florida. 



21. A. Americana L. Ama^n. Acad. 5: 393 (1759). .1. dispersa 

 Trin. & Kupr. Mem. Acad. St. Petersb. (VI.) 7:129 (1849). A. 

 bronwides H. B. K. 'Sov. (Jen. et Sp. 1 : 122 (1815). A. niffrcftcens 

 Presl, Reliq. lltenk. 1:223 (1830). 



A slender grass branching below, often geniculate, 8-35 cm. 

 high. Sheaths shorter than the internodes; ligule reduced to a 

 short fringe. Sterile shoots very few, the blades 2-8 cm. long, those 



