MANUAL OF THE GRASSES OF THE UNITED STATES 



623 



cm. long; sp : kelets mostly paired, 2.8 

 to 3 mm. long, 1.3 to 1.4 mm. wide, 

 elliptic, glabrous; glume and sterile 

 lemma thin, olive brown, covering the 

 fruit or minutely pointed beyond it; 

 fruit light brown at maturity. % 

 — Irrigation ditches, Louisiana; south- 

 ern Brazil and Paraguay. 



46. Paspalum boscianum Fliigge. 

 Bull paspalum. (Fig. 907.) Rather 

 succulent annual, branching at base 

 and commonly from the middle nodes, 

 usually conspicuously brownish pur- 

 ple, glabrous as a whole; culms 40 to 

 60 cm. long, ascending or widely 

 spreading; sheaths broad, loose; 

 blades 10 to 40 cm. long, 8 to 15 mm. 

 wide, papillose-pilose on upper sur- 

 face near base; racemes 4 to 12, usu- 

 ally 4 to 7 cm. long; rachis 2 to 2.5 

 mm. wide; spikelets crowded, obo- 

 vate-orbicular, 2 to 2.2 mm. long, 

 glabrous, rust brown at maturity. 

 O (Depauperate specimens have 

 been described as P. scrobiculatum 

 L.) — Moist or wet open ground, along 

 ditches and ponds, sometimes a weed 

 in cultivated fields, Pennsylvania 

 (ballast), Virginia to Florida, Louisi- 

 ana, Arkansas, and Texas, south to 

 Brazil. 



47. Paspalum convexum Humb. 

 and Bonpl. ex Willd. (Fig. 908.) Culms 



Figure 902. — Paspalum giganteum. Panicle, X 1 ; two 

 views of spikelet, and floret, X 10. (Type.) 



mostly 20 to 40 cm. tall, geniculate- 

 ascending or widely spreading, leafy 



Figure 903. — Paspalum virgatum. Panicle, X 1; two views of spikelet, and floret, X 10. (Hitchcock 9555, 



Jamaica.) 



