50 PANICACE.E. 



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

 near each margin, the latter 1 -nerved, the bent awn protruding one 

 or more times the length of the spikelet. Pedicel about 3 mm. 

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

 Florida, Garber in 1877, Cliivpman. 



13. A. argyreus Schult. Mant. 2 : 450 (1824). A. argen- 

 teus Ell. Bot. S.C. and Ga. 1 : 148 (1817). 



Plant smooth, rather slender, branching above, 60-100 cm. high. 

 Most leaf-blades 30-50 cm. long, 3-5 cm. wide, the upper one a 

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

 bracts, 3-4 cm. long, on slender pedicels ; white liairs on rachis and 

 pedicel longer than the spikelets. Sessile spikelet about 6 mm. 

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

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

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

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

 glumes or wanting. 



The plant has much the appearance of A. Cabanisii. 



Florida, Simi)son, Curtiss 3637; Maryland, Scrihier 3637 from 

 Brinton. 



Delaware to Florida and Texas. 



14. A. Cabanisii Hack. Flora 68 : 133 (1885). 



Culms erect, compressed, sparingly branching toward the top, 

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

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

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

 long, the terminal pair 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, 6 mm. long; first glume flat, scabrid, 

 2-toothed, 8-nerved; second 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. Tlie plant has much the look of 

 A. argyrPAis. 



Florida. Gnrher, now in Herb. Scribner, named by Hackel. 



