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



Prairies and open ground, Nova Scotia to Montana, south to 

 North Carolina and Texas, westward here and there to southern 

 California (fig. 1352). 



Panicum huachucae var. fasciculatum (Torr.) F. T. Hubb. Ver- 

 nal culms taller, more slender, less pubescent, the culms 30 to 75 cm 

 tall; blades thin, lax, spreading, 5 to 10 cm long, 6 to 12 mm wide, 



Figure 1350.— Distribution of 

 Panicum implicatum. 



Figure 1351. — Panicum huachucae. Two 

 views of spikelet, and floret, X 10. 

 (Type.) 



the upper surface sparsely short-pilose or with copious long hairs 

 toward the base, the lower surface pubescent and with a satiny luster. 

 Autumnal culms more or less decumbent with numerous fascicled 

 branches. % (P. huachucae var. silvicola Hitchc. and Chase.) — 

 Open woods and clearings, Quebec to Minnesota and Nebraska, south 

 to northern Florida and Texas; Arizona (Tucson). 



Panicum huachucae, P. huachucae var. fasciculatum, P. tennesseense, 

 and P. pacijicum intergrade more or less. The descriptions apply to 



Figure 1352.— Distribution of 

 Panicum huachucae. 



Figure 1353.— Panicum tennes- 

 seense. Two views of spikelet, 

 and floret, X 10. (Type.) 



Figure 1354— Distribution of 

 Panicum tennesseense. 



the great bulk of specimens but the distinctions fail to hold for occa- 

 sional specimens. 



47. Panicum tennesseense Ashe. (Fig. 1353.) Vernal phase 

 bluish green; culms suberect or stiffly spreading, 25 to 60 cm tall, 

 papillose-pilose or the upper portion glabrous; ligule dense, 4 to 5 

 mm long; blades firm, with a thin white cartilaginous margin, 5 to 8 

 mm wide, the upper surface glabrous or with a few long hairs toward 

 the base, the lower surface appressed-pubescent or nearly glabrous; 

 panicle 4 to 7 cm long; spikelets 1.6 to 1.7 mm long. Autumnal culms 

 widely spreading or decumbent, with numerous fascicled somewhat 

 flabellate branches, often forming prostrate mats; blades usually 

 ciliate at base. % — Open rather moist ground and borders of 

 woods, Quebec to Minnesota, south to Georgia and Texas, and also 

 at a few points west to Utah and Arizona (fig. 1354). 



48. Panicum lanuginosum Ell. (Fig. 1355.) Verna] phase grayish 

 olive-green, verve ty-villous throughout; culms usually in large 

 clumps, 40 to 70 cm tall, lax, spreading, often with a glabrous ring 

 below the villous nodes; ligule 3 to 4 mm long; blades thickishbut not 

 stiff, somewhat incurved or spoon-shaped (when fresh), 5 to 10 cm 

 long, 5 to 10 mm wide; panicle 6 to 12 cm long, the axis pubescent; 

 spikelets 1.8 to 1.9 mm long. Autumnal culms widely spreading or 



