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 

 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. 



CORIDOCHLOA 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 viridis. 



