GENERA OF GRASSES OF THE UNITED STATES. 235 



lanceolate and narrowed into a petiole, the spikelets in an open 

 panicle. Species about 20; in the American Tropics, one extending 

 into southern Florida. 



FIG. 142. Grapevine mesquite, Panicum obtusum. Plant, X I \ spikelet and fertile 



floret, X 10. 



