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



banks, low woods, along streams and irrigation ditches, especially 

 in alkaline clay soil, Louisiana and Texas; Mexico and western Cuba 

 (fig. 1211). 



Paspalum pubiflorum var. glabrum Vasey. Somewhat more 

 robust, the sheaths less pilose, the racemes commonly longer and often 

 more than 5; spikelets glabrous. % (P. geminum Nash; P. laevi- 

 glume Scribn.) — Moist low open ground, woods, and ditch banks, 

 North Carolina and Indiana to Florida, west to Kansas and Texas. 



7. Paspalum lividum Trin. Longtom. (Fig. 1212.) Glabrous; 

 culms solitary or few in a tuft, from a decumbent or creeping base, 50 

 to 100 cm tall: blades 15 to 25 cm long, 3 to 6 mm wide; racemes 



Figure 1212.— Paspalum lividum. Panicle. 

 X 1; two views of spikelet, and floret, 

 X 10. (Arsene 3176, Mex.) 



Figure 1213.— Paspalum hartwegianum. 

 Panicle, X 1; two views of spikelet, and 

 floret, X 10. (Buckley, Tex.) 



usually 4 to 7, ascending, flexuous; rachis 1.5 to 2 mm wide, dark 

 livid purple; spikelets 2 to 2.5 mm long, obovate, subacute. % — 

 Low ground, wet savannas, and swamps, and along streams and 

 ditches, Alabama to Texas and Mexico, south to Argentina; Cuba. 



8. Paspalum hartwegianum Fourn. (Fig. 1213.) Culms ascend- 

 ing from a decumbent base, 50 to 150 cm tall; blades 10 to 35 cm long, 

 2 to 6 mm wide, the margins very scabrous; racemes usually 4 to 7, 

 ascending, 2 to 9 cm long; rachis 1 to 1.5 mm wide; spikelets imbri- 

 cate, about 3 mm long, elliptic, apiculate, softly pubescent. % (P. 

 buckleyanum Vasey.) — Wet prairies, alkaline meadows, and along 

 irrigation ditches, sometimes growing in the water, southern Texas 

 and throughout Mexico. 



