MANUAL OF THE GRASSES OF THE UNITED STATES 



637 



Figure 911. — Panicum ramisetum. Two views of 

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



60 cm. tall; blades 5 to 12 cm. long, 

 2 to 4 mm. Avide; panicle 5 to 20 cm. 



Figure 913. — Panicum firmulum. Two views of spike- 

 let, and floret, X 10. (Type.) 



Figure 912. — Panicum reverchoni. Panicle, X 2; two views of spikelet, and floret, X 10. (Type.) 



long; bristle not exceeding the spike- 

 let; spikelets about 2.5 mm. long, 

 obovate; first glume about half as 

 long as the spikelet. % — Sandy 

 plains and prairies, southern Texas 

 and northern Mexico. 



3. Panicum reverchoni Vasey. (Fig. 

 912.) Culms stiffly erect, from short 

 rhizomes, 30 to 70 cm. tall; blades 

 erect, stiff, 5 to 20 cm. long, 2 to 3 

 mm. wide; panicle 5 to 20 cm. long; 

 spikelets 1 to 4 to a branchlet, the 

 bristle equaling or exceeding the spike- 

 let; spikelets 3.5 to 3.8 mm. long, 

 elliptic ; first glume about half as long- 



as the spikelet. % — Rocky or 

 sandy prairies and limestone hills, 

 Texas. 



4. Panicum firmulum Hitchc. and 

 Chase. (Fig. 913.) Culms ascending 

 or decumbent at base, 30 to 40 cm. 

 tall, rather loosely tufted from creep- 

 ing knotted rhizomes as much as 5 

 cm. long; blades ascending or spread- 

 ing, firm, 4 to 10 cm. long, 4 to 7 

 mm. wide; bristle 1 to 2 times as 

 long as the spikelet; spikelets 3 to 

 3.2 mm. long, obovate; first glume 

 half as long as the spikelet. % — 

 Sandy prairies, southern Texas. 



