ANDROPOGONE^. 51 



15. A. Elliottii Chapm. Fl. S. States, 581 (1860). 



Culms slender, 60-80 cm. high, branching, internodes long, 

 bearded at the upper joints. Sheaths often hairy above, inflated by 

 several young or rudimentary sheaths and spikes ; lower blades 30 

 cm. long, those farther up 2 cm. long, 4 mm. wide, the upper re- 

 duced and threadlike. Spikes 2 or more, about 2 cm. long or 

 threadlike, exserted or enclosed, stems zigzag, hairs on rachis and 

 psdicels exceeding the spikelets. First glume of the sessile spike- 

 let lanceolate, membranous, 4 or more mm. long, 2-nerved, margins 

 involute; second glume membranous, compressed-keeled, 1-nerved, 

 third hyaline, 3-4 mm. long, fourth bifid, with a bent awn about 15 

 mm. long. Sterile floret represented by a threadlike pedicel 4-6 

 mm. long. Stamen 1. 



Florida, Ghaiyman, Curtiss 3636a ; Texas, Nealley ; District 

 of Columbia, Ward. 



Virginia to Florida and Texas, On wet or dry pine barrens. 



Var. laxiflorus Scrib. ined. 



Sheaths of spikes shorter and narrower. Spikes 4-6 cm. long, 

 their internodes twice as long as those of the sjaecies. 



Florida. G. V. Nash 1597 in 1854. 



16. A. Virginicus L. Sp. PI. 1046 (1753). A. dissiiiflorum 

 Michx. Fl. Bor. Am. 1 : 57 (1803). A. vaginahis Ell. Bot. S. 

 C. and Ga. 1 : 148 (1817). 



Plant smooth, or sometimes soft hairy, 60-100 cm. high. 

 Culms flattened below, panicle branching much or little. Sheaths 

 inflated, including spikes and sheaths with spikes inside ; most 

 blades 15-40 cm. long, 2 mm. wide, the upper short. Spikes nearly 

 sessile, slender, zigzag, 2 sometimes 3 together, nearly sessile, 2 cm. 

 long, shorter than the sheaths the upper of which are 3-5 cm. 

 long, the soft dull white hairs on the rachis and peduncles much 

 longer than the spikelets. Sessile spikelet 3-5 mm. long; first 

 glume ovate-lanceolate, 2-keeled, 2-nerved; second glume com- 

 pressed-keeled, 1-nerved, 3 mm. long; third and fourth glumes 

 shorter and hyaline, the awn straight or slightly twisted and bent, 

 1.3-2 cm. long. Pedicel slender, 4 mm. long, bearing a rudimen- 

 tary spikelet or not. Stamen 1. 



