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



58. Panicum languidum Hitchc. 

 and Chase. (Fig. 967.) Vernal culms 

 25 to 40 cm. tall, weak, slender, as- 

 cending or spreading, pilose; sheaths 

 pilose; ligule 3 mm. long; blades thin, 

 lax, ascending or spreading, 4 to 7 

 cm. long, 4 to 9 mm. wide, sparsely 

 pilose on the upper surface, minutely 

 appressed-pubescent beneath; pan- 

 icle 3 to 6 cm. long, the axis and 

 branches sparsely long-pilose; spike- 

 lets 2 mm. long, pilose. Autumnal 

 culms decumbent, branching from all 

 the nodes, forming a large loose strag- 

 gling clump, the ultimate blades and 

 panicles scarcely reduced. % — 

 Dry or sandy open woods, Maine, 

 Massachusetts, Vermont, and eastern 

 New York, apparently rare. 



Figure 965. — Panicum pacificum. Two views of spike- 

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



mm. wide, the upper surface pilose, 

 the lower surface appressed-pubes- 

 cent; panicle 5 to 10 cm. long; spike- 

 lets 1.8 to 2 mm. long. Autumnal 

 culms prostrate spreading, repeatedly 

 branching from the middle and upper 

 nodes. % —Sandy shores and 

 slopes, and moist crevices of rocks, 

 ascending to 1,600 m., British Colum- 

 bia and Montana to southern Cali- 

 fornia and Arizona. 



Figure 966. — Panicum thermale. Two views of spike- 

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



57. Panicum thermale Boland. 

 (Fig. 966.) Vernal phase grayish 

 green, densely tufted, velvety-villous; 

 culms 10 to 30 cm. tall, ascending or 

 spreading, the nodes with a dense 

 ring of short hairs; ligule 3 mm. long; 

 blades thick, 3 to 8 cm. long, 5 to 12 

 mm. wide; panicle 3 to 6 cm. long, 

 the axis villous; spikelets 1.9 to 2 

 mm. long, pilose. Autumnal culms 

 widely spreading, repeatedly branch- 

 ing, the whole forming a dense cush- 

 ion. 91 — Wet saline soil in the 

 immediate vicinity of geysers and hot 

 springs, ascending to 2,500 m., Al- 

 berta to Washington, south to Wyo- 

 ming, Utah, and California. 



Figure 968. — Panicum villosissimum. Two views of 

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



59. Panicum villosissimum Nash. 

 (Fig. 968.) 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. 

 % — Dry sandy or sterile soil, open 

 woods, and hillsides, Massachusetts 

 to Michigan and Kansas, south to 

 Florida and Texas; Guatemala. 



60. Panicum benneri Fernald. (Fig. 

 969.) Vernal phase light olive green; 

 culms 20 to 35 cm. tall, papillose- 



Figure 967. — Panicum languidum. Two views of 

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



