MANUAL OF THE GRASSES OF THE UNITED STATES 695 



margins only; panicle dense, as much as 30 cm long; spikelets some- 

 what less turgid than in E. crusgalli, the awns usually purple, 1 to 2 

 cm long or sometimes longer, o — Wet places, often in shallow 

 water, or brackish marshes, Coastal Plain, Massachusetts to Florida 

 and Texas; New York to Wisconsin, Iowa, and Kentucky (fig. 1560). 

 Sheaths rarely glabrous (E. longearistata Nash) . 



134. TRICHOLAENA Schrad. 



Spikelets on short capillary pedicels; first glume minute, villous; 

 second glume and sterile lemma equal, raised on a stipe above the first 

 glume, emarginate or slightly lobed, short- 

 awned, covered, except toward the apex, with 

 long silky hairs, the palea of the sterile lemma 

 well developed; fertile lemma shorter than the 

 spikelet, cartilaginous, smooth, boat-shaped, 

 obtuse, the margin thin, not inrolled, enclosing 

 the margins of the palea. Perennial or annual 

 grasses, with rather open panicles of silky FlGV ^S^ [ ^l!° n 0l 

 spikelets. Type species, Tricholaena micrantha 



Schrad. Named from Greek thrix (trich-) hair, and chlaina, cloak, 

 alluding to the silky spikelets. 



1. Tricholaena rosea Nees. Natal grass. (Fig. 1561.) Annual; 

 culms slender, about 1 m tall; blades flat, 2 to 5 mm wide; panicle 

 rosy purple, 10 to 15 cm long, the branches slender, ascending; spike- 

 lets about 5 mm long, the capillary pedicels flexuous or recurved. 

 O — Sandy prairies, open woods, fields, and waste places, Florida 

 and Texas; naturalized from South Africa; drier parts of tropical 

 America at low altitudes. Cultivated as a meadow grass in sandy 

 soil in Florida and more rarely along the Gulf coast. Referred by 

 some to Rhynchelytrum repens (Willd.) Hubb., a dubious name. 



CORID0CHLOA Nees 



Spikelets flattened, ovate, in 2 or 3's, subsessile along a slender 

 rachis; glumes and sterile lemma papery, the second glume stiffly 

 ciliate ; fruit stipitate, awned. Annual, with several digitate racemes 

 naked at base. 



Coridochloa cimicina (L.) Nees. Culms 20 to 60 cm tall; sheaths 

 hispid; blades 3 to 8 cm long, 1.5 to 2.5 cm wide, subcordate; racemes 

 mostly 4 to 8, digitate, sometimes a second whorl below; spikelets 

 about 3 mm long, the awn of the fruit curved, about 1 mm long.— 

 Sparingly introduced in Florida. Southern Asia. 



135. SETARIA Beauv. 



(Chaetochloa Scribn.) 



Spikelets subtended by one to several bristles (sterile branchlets), 

 falling free from the bristles, awnless; first glume broad, usually less 

 than half the length of the spikelet, 3- to 5-nerved; second glume and 

 sterile lemma equal, or the glume shorter, several-nerved; fertile 

 lemma coriaceous-indurate, smooth or transversely rugose. Annual 

 or perennial grasses, with narrow terminal panicles, these dense and 

 spikelike or somewhat loose and open. Type species, Setaria riridis. 



