48 Bulletin VII. 1. 



wide, acute rounded and more or less clasping at the base, margins 

 scabrous and ciliate near the base, surfaces smooth or with a few 

 scattering hairs, or the under side densely pubescent. Panicle two 

 to five inches long, the few-flowered, solitary and erect or more or 

 less spreading branches scabrous, pubescent or pilose. Spikelets 

 one and one-half to two lines long, ovate or obovate; first glume 

 about one-third the length of the others, acute or obtuse; second 

 and third glumes broadly ovate, conspicuously nine- to eleven- 

 nerved, nearly smooth or pubescent, the third with a palea; fourth 

 glume smooth and shining, minutely apiculate. Dry fields and 

 open woods. May — June. 



A variable species, as here characterized, presenting several 

 well-marked forms or varieties. 



YdiV. genuinum. Stem and sheaths villous; leaves three to six 

 inches long, six to twelve lines wide, densely and softly pubescent 

 on the lower surface, the upper surface smooth, or nearly so; pan- 

 icle three to five inches long, the large (nearly two lines) spikelets 

 borne mostly near the ends of the branches. (P. scoparium Lam., 

 Ell.: P. scoparium major Vasey.) West Tennessee (S. M. Bain). 

 Approaches P. Walteri Poir, and treated as a variety of that spe- 

 cies by Trinius. 



\2lX. paiiciflorum. Plate XII. Figure 46. Stem slender, sheaths 

 and narrow (three to four lines) leaves nearly smooth, except 

 along the margins; panicle smaller and fewer-flowered than in var. 

 genuinum. P paucifiorum Ell., ( P. scoparium var. angustifolium Vasey.) 

 Not observed in Tennessee. 



Var. viinor. Leaves erect, about one-fourth of an inch wide, and 

 with the sheaths often papillate-pilose; panicle one to three inches 

 long; spikelets one and one-half lines long, more rounded and 

 more crowded in the panicle than in the other varieties. Panicle 

 branches and spikelets nearly smooth, or (subvar. ///(^i-z/w) densely 

 pilose hairy. Middle Tennessee (Gattinger). This is the most 

 widely distributed and best known form of the species. 



19. Panicum angustifolium Ell. 



Plate XII. Figures -47, 48, (as P. consanguineum). 



Culms one to two feet high, at first simple, finally very much 

 branched throughout; slightly pubescent, especially at the nodes. 

 Sheaths shorter than the internodes, more or less pubescent, at 

 least the lower ones; ligule a fringe of rather short hairs; leaf- 

 blade of the primary stem erect, three to six inches long, two to 

 three lines wide, rigid, very acute, margins scabrous, minutely cil- 

 iate near the base. Leaves of the wiry branches very numerous 

 and involute-filiform. Panicles three to four inches long, rather 

 loosely flowered, the scabrous main axis and nearly simple branches 

 flexuose. Spikelets about one and one-half lines long, oblong-ellip- 

 tical, obtuse or subacute; first glume thin, scarious, nerveless, one- 

 fourth as long as the others; second and third glumes finely pubes- 

 cent, obtuse, the second seven- to nine-nerved, the third seven- 

 nerved and without a palea; the fourth glume minutely apiculate 

 and slightly barbulate at the apex. Sterile soil, May to June. 

 Henderson (S. M. Bain); also near Knoxville. 



