MANUAL OF THE GRASSES OF THE UNITED STATES 



683 



branches erect, the lower distant, the upper approximate, 2 to 10 

 cm long; spikelets 2.4 to 2.7 mm long, lanceolate, acute; first glume 

 about half the length of the spikelet; fruit less rigid than usual in 

 the genus, the apex of the palea scarcely enclosed. 01 Moist soil 

 along river banks and ditches, borders of lakes and ponds, often in 



FIGURE 1538. Panicum brachyanthum. Two views of spikelet, and floret, X 10. (Type.) 



the water, sometimes a weed in moist cultivated fields, Coastal Plain, 



New Jersey to Florida and Texas; Brazil (fig. 1543). 



16. Gymnocarpa. Succulent glabrous perennial; panicles of several 



to many long stiffly ascending racemes along a main axis; 



spikelets strongly 3- to 5-nerved, glabrous. 



160. Panicum gymnocarpon Ell. (Fig. 1544.) Creeping, the base 

 as much as 2 m long, rooting at the nodes; culms 60 to 100 cm tall; 



FIGURE 1539. Panicum urvilleanum. Two views of spikelet, and floret, X 10. (Type.) 



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 sterile lemma, 

 all acuminate-pointed, much exceeding the obovate, stipitate fruit, 

 this 2 mm long, smooth and shining. 91 Ditches and muddy 

 banks of streams and lakes, Georgia and Florida to Texas (fig. 1545). 



