GENERA OF GRASSES OF THE UNITED STATES. 
237 
Annuals or perennials, of wet soil, usually branching, the inflores- 
cence a dense, usually elongate, spikelike panicle. Species about 
12; in the Tropics of both hemi- 
spheres, 1 extending into the south- 
eastern United States. 
Type species: Panicum gibhum Ell. 
Sacciolepis Nash, in Britton, Man. 80. 
1901. Only one species is described. 
Sacciolepis striata (L.) Nash 
(Holcus striatus L., Panicum gib- 
bum Ell.) (fig. 144) is a stolonifer- 
ous marsh grass found from Vir- 
ginia to Oklahoma and southward. 
It has no economic value. 
121. Oplismentjs Beauv. 
Spikelets terete or somewhat lat- 
erally compressed, subsessile, soli- 
tary or in pairs, in two rows 
crowded or approximate on 
one side of a narrow scabrous 
or hairy rachis; glumes 
about equal, emarginate or 
2-lobed, awned from between 
the lobes; sterile lemma ex- 
ceeding the glumes and fruit, 
notched or entire, mucronate 
Fig. 144. — Sacciolepis striata. Plant, X \ ; two views of spikelet and fertile floret, 
X 10. 
or short-awned, inclosing a hyaline palea ; fertile lemma elliptic, acute, 
convex or boat shaped, the firm margins clasping the palea, not inrolled. 
