706 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



nerved, pointed, the first glume one-third to 

 scarcely half as long as the spikelet. oi — 

 Cultivated in experiment stations in Mis- 

 souri, Texas, Oklahoma, Arizona (spreading 

 in Cochise County), and California. India. 



138. LASlACIS (Griseb.) Hitch 



Spikelets subglobose, placed ob- 

 liquely on their pedicels; first glume 

 broad, somewhat inflated-ventricose, 

 usually not more than one-third the 

 length of the spikelet, several-nerved; 

 second glume and sterile lemma about 

 equal, broad, abruptly apiculate, 

 papery-chartaceous, shining, many- 

 nerved, glabrous, or lanose at the 

 apex only, the lemma enclosing a 

 membranaceous palea and sometimes 

 a staminate flower; fertile lemma 

 white, bony-indurate, obovoid, ob- 

 tuse, this and the palea of the same 

 texture, bearing at the apex in a 

 slight depression a tuft of woolly 

 hairs, the palea concave below, gib. 

 bous above, the apex often free at 

 maturity. Large branching peren- 



Figtjre 1078. — Panicum hemitomon. Panicle, X 1 ; 

 spikelet and floret, X 10. (Tracy 6731, Fla.) 



fields, Coastal Plain, New Jersey to 

 Florida and Texas; Tennessee; Brazil. 



17. Gymnocarpa. — Succulent gla- 

 brous perennial; panicles of sev- 

 eral to many long stiffly ascend- 

 ing racemes along a main axis; 

 spikelets strongly 3- to 5-nerved, 

 glabrous. 

 170. Panicum gymnocarpon Ell. 

 (Fig. 1079.) Creeping, the base as 

 much as 2 m. long, rooting at the 

 nodes; culms 60 to 100 cm. tall; 

 blades elongate, 15 to 25 mm. wide, 

 flat, scarcely narrowed at the cordate, 

 sparingly ciliate base, the margin very 

 scabrous; panicle 20 to 40 cm. long; 

 spikelets 6 to 7 mm. long; first glume 

 nearly as long as the sterile lemma, 

 the second glume exceeding the ster- 

 ile lemma, all acuminate-pointed, 

 much exceeding the obovate, stipitate 

 fruit, this 2 mm. long, smooth and 

 shining. % — Ditches and muddy 

 banks of streams and lakes, South 

 Carolina to Florida, Arkansas, and 

 Texas. 



Panicum antidotale Retz. Robust gla- 

 brous, branching, leafy perennial, to 3 m. 

 tall, with strong rhizomes; blades elongate, 

 flat, 5 to 12 mm. wide; panicle 20 to 30 cm. 

 long, the many-flowered branches ascend- 

 ing; spikelets 2.5 to 3 mm. long, strongly 



Figure 1079. — Panicum gymnocarpon. Panicle, X 1» 

 spikelet and floret, X 10. (Type.) 



