48 



wide 3 or rarely 5 nerved; flowering glume smooth or minutely scabrous, borne 

 on a short stipe, 11 to 13 nnn. long, 5-nerved, the nerves next the keel often 

 shortly excurrent, tipped with a straight or sometimes divergent scabrous awn 

 2 to 4 cm. in length. Palea about 10 nun. long, narrow, tapering to a narrow, 

 truncate, or minutely bidentate point, scabrous on the keels. 

 Closely allied to E. canaden-va L., but easily distinguished by its smaller size and the 



scabrous but not hirsute flowering glumes. 

 General bistkibutiox. — 3Ioist, open or somewhat shaded ground, from Michigan 



and South Dakota south to Tex- 

 as, New Mexico, and into 

 Mexico. 

 Type specimen collected by Dr. Ed- 

 ward Palmer, No. 420, " in the 

 Indian Territory, chiefly on the 

 False Washita, between Fort 

 Cobb and Fort Arbuckle, 1868." 

 Specimens examined. — Michigan: 

 "Southern Michigan," 1409 O. 

 A. Farwell, August, 1893. Iowa: 

 Several specimens in Herb. 

 Iowa State College from west- 

 ern and northern Iowa. South 

 Dakota : Hot Springs, 1173, 1174 

 P. A. Rydberg, August, 1892. 

 Colorado : Colorado Springs, 

 734 C. L. Shear, July, 1896; 

 "Walsenburg, Huerfano County, 

 778 C. L. Shear, July, 1896; 

 Chase, Park County, 1101 C. L. 

 Shear, September, 1896; "along 

 Burl, and Mo. P. Ry.," L. H. 

 Pammel, July, 1896. Kansas: 

 Manhattan, W. A. Kellerman, 

 July, 1888; Osborne, 709 C. L. 

 Shear, June, 1896; Syracuse, 

 135 C. H. Thompson, July, 

 1893. Texas: Austin, 34 E. N. 

 Plank, July, 1892; Kerrville, 

 J. G. Smith, June, 1897; no 

 locality, 571 F. Lindheimer, 

 1846. Neir 3fe.rico: 2075 C. 

 Wright, 1851-52. ^fe.rico : Sal- 

 tillo, Coahuila, 260 Dr. E. 

 Palmer, June, 1898. 

 EliYMUS DIVER SI GLUM IS 

 sp. nov. (Fig. 22.) 



A rather stout, erect perennial, 9 to 12 dm. high, with a slender, flexuous spike 1 to 

 1.5 cm. long, and the empty glumes reduced or nearly wanting. Culms terete, 

 glabrous; nodes glabrous; sheaths glabrous, striate, nearly equaling or longer 

 than the internodes; ligule membranaceous, less than 2 mm. long; leaf-blades 

 spreading, 1.5 to 2.5 cm. long, 6 to 12 nnn. wide, tapering to a long-acuminate point, 

 scabrous on both surfaces and the margins; rachis rather slender, compressed, 

 smooth or scaljrous-ciliate on the edges and upper part of each internode. 

 Spikelets in pairs, 2-flowered; empty glumes subulate, scabrous, varying from 



Fig. 2'2. — Elj/mKS ilirerMDlinnin, ScTibn. & Ball: n, aiiU- 

 rior view of a floret and dorsal view of apex of a flow 

 ering glume. 



