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. 
