50 PAXK'AC'E.E. 



long; first and second glumes equal, the former with two nerves 

 near each nuirgiu, the latter 1-uerved. the bent awn i)rotruding one 

 or more times the length of the spikelet. Pedicel about ;} mm. 

 long, bearing a minute rudiment consisting of a suigle glume. 

 Florida, Garber in 1877, Chapman. 



13. A. argyreus Schult. Mant. 2 : 450 (1824). A. arr/en- 

 teus Ell. Hot. S.C. and (Ja. 1 : 148 (1817). 



Plant smooth, rather slender, branching above, GO-lOO cm. high. 

 Most leaf-blades 30-50 c!m. long, 3-5 cm. wide, the upj)er one a 

 mere bristle. Spikes usually in pairs, mostly exserted, without 

 bracts. 3-4 cm. long, on slender pedicels: white hairs on rachis and 

 pedicel longer than the spikelets. Sessile spikelet about mm. 

 long, 2 outer glumes membranous, hmceolate; first glume 2-keeled, 

 2-nerved, 2-toothed; second compressed-keeled, 3-nerved; third and 

 fourth hyaline and shorter, the twisted aw)) on the latter 10-15 

 mm. long. Stamens 3. -Sterile spikelet composed of 1-2 small 

 glunu's or wanting. 



The ])lant has much the appearance of A. Cahanisii. 



Florida, aShhjisoii, Curths 3037; Maryland, Scribner 3G37 from 

 Brinton. 



Delaware to Florida and Texas. 



14. A. Cabanisii Hack. Flora 08 : 133 (1885). 



Culms erect, compressed, sparingly branching toward the top, 

 often 120 cm. high. The middle sheaths half as long as the in- 

 ternodes, which are often 20 cm. long; blades firm, smooth, often 

 involute, 15-25 cm. lorg. 4 mm. wide. Spikes in pairs, 5-7 era. 

 long, the terminal i)air barely exserted, the lateral ones more or 

 less enclosed by the sheathing bracts, the rachis and pedicels thinly 

 clothed by fine soft white hairs reaching beyond the spikelet. Fer- 

 tile spikelets linear, acute, mm. long; first glume flat, scabrid, 

 2-toothed, 8-nerved; secoiul incurved, acute, keeled, 3-nerved; 

 third elliptical when spread. 2-nerved; fourth bearing a bent awn 

 about 10 mm. long. Pedicels 4-5 mm. long, bearing a single 

 awnless glume 3 mm. long. The plant has much the look of 

 A. avf^./rcKs. 



Florida,, (iarbei\ now in Herb. Scribner, named by Ilackel. 



