716 



MISC. PUBLICATION 200, U. S. DEFT. OF AGRICULTURE 



Figure 1092. 



-Echinochloa walteri, X 1. 

 1426, 111.) 



(Chase 



stiff hairs on the nerves not tuber- 

 culate; awns mostly 1 to 2.5 cm. long. 

 O — Wet places, often in shallow 

 water or brackish marshes, Coastal 

 Plain, Massachusetts to Florida and 

 Texas; Wisconsin, Iowa, and Arkan- 

 sas. Short-awned specimens have 

 been segregated as forma breviseta 

 Fern, and Grisc. Echinochloa wal- 

 teri forma laevigata Wiegand. 

 Sheaths glabrous. (E. longearistata 

 Nash.) Wisconsin, Virginia, South 

 Carolina, Arkansas, Louisiana, and 

 Texas. 



142. RHYNCHELYTRUM Nees 



(Included in Tricholaena Schrad. in 

 Manual, ed. 1) 



Spikelets on short capillary pedi- 

 cels; first glume minute, villous; sec- 

 ond glume and sterile lemma equal, 

 gibbous below, raised on a stipe above 

 the first glume, emarginate or slightly 

 lobed, short-awned, covered, except 

 toward the slightly spreading apex, 

 with long silky hairs, the palea of the 

 sterile lemma well developed; fertile 

 lemma shorter than the spikelet, car- 

 tilaginous, smooth, boat-shaped, ob- 



tuse, the margin thin, not inrolled, 

 enclosing the margins of the palea. 

 Perennials or annuals, with rather 

 open panicles of silky spikelets, the 

 fruit not falling from the spikelet at 

 maturity. Type species Rhynchely- 

 trum dregeanum Nees. Name from 

 Greek, rhychos, beak, and elytron, 

 scale, alluding to the beaked second 

 glume and sterile lemma. This genus 

 has, until recently, generally been in- 

 cluded in Tricholaena Schrad. The 

 type species of the two are sufficiently 

 different to recognize this as generi- 

 cally distinct. 



1. Rhynchelytrum roseum (Nees) 

 Stapf and Hubb. Natal grass. 

 (Fig. 1093.) Short-lived perennial, 

 sometimes apparent^ annual; culms 

 slender, about 1 m. tall; blades 

 flat, 2 to 5 mm. wide; panicle rosy 

 purple, fading to pink, silvery in 

 age, 10 to 15 cm. long, the branches 

 slender, ascending; spikelets about 5 

 mm. long, the capillary pedicels flex- 

 uous or recurved. Ql (Tricholaena 

 rosea Nees.) — Sandy prairies, open 

 woods, fields, and waste places, Flor- 

 ida, Texas, and Arizona, 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. 



CORIDOCHLOA Nees 



Spikelets flattened, ovate, in 2's or 

 3's, subsessile along a slender rachis; 

 glumes and sterile lemma paper} 7 , the 

 second glume stiffly ciliate; fruit stipi- 

 tate, concavo-convex, awned. Annual, 

 with several digitate racemes naked 

 at base. 



Coridochloa cimicina (L.) Nees ex 

 Jacks. Culms 20 to 60 cm. tall; 

 sheaths hispid; blades 3 to 8 cm. long, 

 1.5 to 2.5 cm. wide, subcordate; ra- 

 cemes mostly 4 to 8, digitate, some- 

 times a second whorl below; spikelets 

 about 3 mm. long, the awn of the 

 fruit curved, about 1 mm. long. O 

 — Sparingly introduced in Florida. 

 Southern Asia. 



