ANDROPOGONE.E. 45 



(1875-79). A. feneUm Presl. Eeliq. Hjenk. 1: 335 (1830). Blades 

 obtuse, 2-5 cm. loug, 1.5-5 mm. wide. Racemes very slender, 1-2 

 cm. loug ; spathe 1.5-2 cm. loug. Sessile spikelets 3-1 mm. loug, 

 the awu 8-12 mm. long. 



Mexico, Pringle 1771. 



Mexico to Brazil, Madagascar, ludia, Cliiua, aud other couu- 

 tries. 



4. A. tener Kuuth. Eev. Gram. 2, 565 t. 197 (1829). 



Culms very slender, 20-70 cm. high, branching sparingly, tlie 

 exserted threadlike tips 2-10 cm. long, each carrying a single 

 narrow spike 4-6 cm. loug. Sheaths of culm almost carinate; 

 ligule truncate, glabrous, very short; blades destitute of hairs, the 

 lower ones 2-5 cm. long, 0.9-2 mm. wide, the upper bristlelike, 

 1-2 cm. long. Short hairs ou the rachis below the sessile spike- 

 lets. Stipe 3-6 cm. long, sparingly clothed on one edge with short 

 hairs, each spikelet subtended by a short 2-pointed bract. The 

 first glume of the sessile spikelet ovate-lanceolate, 4-5 cm. long^ 

 flattened, 2-keeled, obscurely 7-nerved ; second glume as long as the 

 first, compressed-keeled, 3-nerved, fourth bearing a twisted awn 8-14 

 mm. loug. Anthers 2 mm. long. Pedicellate spikelets flattened, 

 3-5 mm. long, of 2-3 glumes only. It resembles considerably A. 

 cirratiis Hack. 



Mexico, Palmer 504. 



Florida to Texas and Mexico. 



Yar. filiformis (Nees) Hack. D. C. Monog. Phan. 6 : 379 

 (1889). Scliizacliijrium filiforme Nees, Agrost. Bras. 338 

 (1829). Culms filiform, 40-60 cm. high, branching from the base; 

 leaf -blades convolute, filiform, 0.4-0.5 mm. diam. ; spikes, 3-4 cm. 

 long. 



Florida, Curfiss ; Miss., Tracy, 



A. cirratus Hack, in Flora 68 : 119 (1885). 



Plant glaucous. Culms sparingly branched, thread-like, ex- 

 serted, 3-5 cm. long, each bearing a single spike 4-6 cm, long. 

 Sheaths terete; ligule 2 mm. long; blade very sparingly hairy, the 

 lower and mjddle ones 10-15 cm. long, 3 mm. wide, the upper 

 rarely 2 cm. long. Spikes single, the rachis at each node and 



