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



pubescent like the culm; ligule 1 to 1.5 mm long; blades 4 to 7 mm 

 wide, glabrous or nearly so on the upper surface, appressed-pubescent 

 beneath; panicle 3 to 7 cm long; spikelets 1.8 to 1.9 mm long. Autum- 



FIGURE 1387. Panicum wilmingtonense. 

 Two views of spikelet, and floret, X 10. 

 (Type.) 



FIGURE 1388. Panicum tsugetorum. 

 Two views of spikelet, and floret, 

 X 10. (Type.) 



nal culms decumbent-spreading, branching from the lower and middle 

 nodes. 9J. Sandy woods, Maine to Wisconsin, south to Georgia 

 and Tennessee (fig. 1389). 



68. Panicum columbianum Scribn. (Fig. 1390.) Vernal culms 

 15 to 50 cm tall, ascending, densely crisp-puberulent; sheaths less 

 pubescent than the culms; blades 3 to 6 cm long, 3 to 5 mm wide, usu- 

 ally glabrous on the upper surface, appressed- 



puberulent or glabrous beneath; panicle 2 to 



4 cm long; spikelets 1.5 to 1.6 mm long. 



Autumnal culms branching from the middle 



and upper nodes, becoming widely spreading 



or decumbent at base. 91 Sandy woods 



and open ground, Maine to North Carolina; 



Indiana (fig. 1391). 



PANICUM COLUMBIANUM var. raf NIUM Hitchc. 



and Chase. Vernal culms more slender, usu- 

 ally about 20 cm tall; 

 blades rarely more than 

 3 cm long, sparsely pilose 

 with long hairs on the 

 upper surface; panicle 

 1.5 to 4 cm long; spike- 

 lets 1.3 to 1.4 mm long. 

 Autumnal culms with 

 branches more crowded 



and aggregate toward the summit. 91 Dry 



sand, Massachusetts to Virginia. 



69. Panicum oricola Hitchc. and Chase. (Fig. 



-orvr\fr 11 i fj. viz FIGURE 1390. Panicum colum- 



1392.) Vernal phase grayish, often purplish; Manum. riant, x i; two views 

 culms and sheaths appressed-pilose, the culms ( Ty s ^ k ) elet ' and fl ret ' X 10> 

 10 to 30 cm tall, spreading; ligule 1 to 1.5 mm 



long; blades 2 to 5 cm long, 2 to 4 mm wide, the upper surface pilose 

 with hairs 3 to 5 mm long, the lower surface appressed-pilose; panicle 

 short-exserted, ovoid, 1.8 to 3 cm long, rather densely flowered; spike- 

 lets 1.5 mm long, broadly obovate, turgid. Autumnal culms prostrate, 

 forming mats, with short fascicled branches at all the nodes. 91 

 Sand barrens along the coast, Massachusetts to Virginia (fig, 1393). 



FIGURE 1389. Distribution of 

 Panicum tsugetorum. 



