638 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



dense cushion. 91 — Wet saline soil in the immediate vicinity of 

 geysers and hot springs, ascending to 2,500 m, Alberta to Washing- 

 ton, south to Wyoming and California (fig. 1370). 



56. Panicum languidum Hitchc. and Chase. (Fig. 1371.) Vernal 

 culms 25 to 40 cm tall, weak, slender, ascending or spreading, pilose; 

 sheaths pilose; ligule 3 mm long; blades thin, lax, ascending or spread- 

 ing, 4 to 7 cm long, 4 to 9 mm wide, sparsely pilose on the upper sur- 

 face, minutely appressed-pubescent beneath; panicle 3 to 6 cm long, 

 the axis and branches sparsely long-pilose; spikelets 2 mm long, pilose. 

 Autumnal culms decumbent, branching from all the nodes, forming a 



41 



m ! I 



Figure 1371. — Panicum languidum. Two 

 views of spikelet, and floret, X 10. 

 (Type.) 



Figure 1372. — Panicum villosissimum. 

 Two views of spikelet, and floret, X 10. 

 (Type.) 



large loose straggling clump, the ultimate blades and panicles scarcely 

 reduced. 91 — Dry or sandy open woods, Maine, Massachusetts, 

 Vermont, and eastern New York, apparently rare. 



57. Panicum villosissimum Nash. (Fig. 1372.) Vernal phase light 

 olive green; culms 25 to 45 cm tall, erect or ascending, pilose with 

 spreading hairs 3 mm long; sheaths pilose; ligule 4 to 5 mm long; 

 blades rather firm, 6 to 10 cm long, 5 to 10 mm wide, pilose on both 

 surfaces; panicle 4 to 8 cm long, the branches stiffly ascending or 

 spreading; spikelets 2.2 to 2.3 mm long, pilose. Autumnal culms 

 finally prostrate, the leaves of the fascicled branches appressed, giving 

 the cluster or mat a combed-out appearance. 01 — Dry sandy or 



Figure 1373. — Distribution of 

 Panicum villosissimum. 



Figure 1374. — Panicum pseudopubescens- 

 Two views of spikelet, and floret, X 10. 

 (Type.) 



sterile soil, open woods, and hillsides, Massachusetts to Minnesota, 

 south to Florida and Texas; Guatemala (fig. 1373). 



58. Panicum pseudopubescens Nash. (Fig. 1374.) Vernal phase 

 similar to that of P. villosissimum; ligule 2 to 3 mm long; blades with 

 the pubescence on the upper surface short, sparse or wanting down the 

 center, occasionally glabrous; spikelets 2.2 to 2.4 mm long, pilose. 

 Autumnal culms stiffly spreading, sometimes prostrate, sparingly 

 branching from the middle and lower nodes. 21 — Sandy open 

 woods, Connecticut to Wisconsin, south to Florida, Kansas, and Mis- 

 sissippi; Mexico (fig. 1375). 



