19 



§ § Eadils pilose. 



9. Cheetochloa viridis (L.) Scribn. U. S. Dept. Agr., Div. Agros. Bui. 4 : 39 (1897). 

 Panicumviride L. Sp. PI. ed. 2, 83 (1762) . Setaria viridis Beauv. Agrost. 51 (1812) . 

 Chamxraphh viridis Porter Bui. Torr. Bot. Club. 20 : 196 (1893) . Ixophorus 

 riridis Nash Bui. Torr. Bot. Club. 22 : 423 (1895). (Fig. 8.) 



An erect, glabrous, csespitose annual, 2 to 9 dm. high, with short, lanceolate leaves 

 and dense, cylindrical, spike-like green panicles 2 to 10 cm. long. Culms usually 

 much branched at the base, glabrous, compressed; nodes smooth; sheaths com- 

 pressed, loose, longer than the in- 

 ternodes, ciliate on the margins; 

 ligule short, ciliate with long, white 

 hairs; leaf-blades 0.5 to 2.5 dm. 

 long, 4 to 10 mm. wide, scarcely 

 narrowed at the cordate base, long- 

 acuminate, slightly scabrous on 

 » both sides or sometimes nearly 

 glabrous, serrulate-scabrous on the 

 cartilaginous margins. Panicles 

 linear-ovate in outline, tapering to 

 the obtuse apex; rachis striate, \dl- 

 lous, generally about 1 cm. in 

 diameter, exclusive of the bristles; 

 setse slender, strict, spreading, 

 antrorsely scabrous, 1 to 1.5 cm. 

 long, green or rarely purplish. 

 Spikelets about 2 mm. long, ellip- 

 tical; first glume triangular-ovate, 

 3-nerved, about one-third the 

 spikelet in length; second and 

 third glumes elliptical, obtuse, 5- 

 nerved, equaling the spikelet, the 

 third glume subtending a lanceo- 

 late, hyaline palea one-third its 

 own length; flowering glume el- 

 liptical, rounded at the apex, finely 

 and faintly transversely wrinkled 

 below, or only striate and pitted, 

 the inclosed palea equaling it in 

 length, similar in texture and 

 markings. 



In waste places and cultivated grounds 

 throughout North America. Natu- 

 ralized from Europe. July-Sep- 

 tember. 



Specimens examined. — Newfoundland: Waghorne 1892. Ottawa: Macoun 1894, 

 Fletcher 1891. Maine: Auburn, Merrill 1897. New Hampshire: Peterboro, 236 

 Robinson 1897. Connecticut: 26 Wilson 1892. New York: Union Springs, 37 

 Dudley; Oxford, Coville 1884. ^ Pennsylvania: Easton, Porter 1887; Harrisburg, 

 Small 1888; Philadelphia, Smith. Delaware: Stanton, 147 Commons 1897. District 

 of Columbia : Blanchard 1891, 532 Pollard 1895, Topping 1895. Ohio : Ricksecker 

 1894. Mc7i%a7i .• Clifton, 629 Farwell. Jfermessee.- Knoxville, Scribner. loiva: 

 Battle Creek, 956 Preston 1897; Fayette Co., 273 Fink 1894; Carnarvon, 291 

 Pammel 1896; Clinton, 268 Ball 1895; Des Moines, 28 Ball 1898; Manchester, 



Fig. 8. — Ch cetochloa viridis : a, branch allowing spikelet 

 and setcB; b, c, views of the spikelet; d, flowering 

 glume, dorsal view. 



