MANUAL OF THE GRASSES OF THE UNITED STATES 



637 



53. Panicum occidentale Scribn. (Fig. 1365.) Vernal cuJms yel- 

 lowish green, leafy toward base, 15 to 40 cm tall, spreading, sparsely 

 pubescent; sheaths sparsely pubescent; ligule 3 to 4 mm long; blades 

 firm, erect, or ascending, 4 to 8 cm long, 5 to 7 mm wide, the upper 

 surface nearly glabrous, the under appressed-pubescent; panicle 4 to 

 7 cm long; spikelets 1.8 mm long. Autumnal culms branching from 



Figure 1365.— Panicum occidentale. 

 Two views of spikelet, and floret, 

 X 10. (Type.) 



Figure 1366.— Distribution of 

 Panicum occidentale. 



the lower nodes forming a spreading tussock 10 to 15 cm high; leaves 

 and panicles reduced. % — Peat bogs and moist sandy ground, 

 British Columbia and Idaho to southern California (fig. 1366). 



54. Panicum pacificum Hitchc. and Chase. (Fig. 1367.) Vernal 

 phase light green; culms 25 to 50 cm tall, ascending or spreading, 

 leafy, pilose, the nodes short-bearded; sheaths pilose; ligule 3 to 4 mm 



Figure 1368.— Distribution of 

 Panicum pacificum. 



Figure 1367 .—Panicum pacificum. Two 

 views of spikelet, and floret, X 10. 

 (Type.) 



long; blades erect or ascending, 5 to 10 cm long, 5 to 8 mm wide, the 

 upper surface pilose, the lower surface appressed-pubescent; panicle 

 5 to 10 cm long; spikelets 1.8 to 2 mm long. Autumnal culms pros- 

 trate spreading, repeatedly branching from the middle and upper 

 nodes. % — Sandy shores and slopes, and moist crevices of rocks, 



Figure 1369.— Panicum thermal*. Two 

 views of spikelet, and floret, X 10. 

 (Type.) 



Figure 1370.— Distribution of 

 Panicum thermale. 



ascending to 1,600 m, British Columbia and Idaho to Arizona and 

 southern California (fig. 1368). 



55. Panicum thermale Boland. (Fig. 1369.) 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 branching, the whole forming a 



