PijXi — NeivamJ Lilrredmg America a Grasses. 149 



with a stout (iivergont scabrous awn of eiiual length ; palet oblong-linear, 

 obtuse, shorter than the body of the liowering glume, the nerves strongly 

 scabrous ciliate, the sides less than one-half as l)road as the internerve. 



Type specimen collected by Williams and Griftiths, No. 140, (jn the North 

 Fork of Clear Creek, Wyoming, altitude 2,600 meters. Other specimens 

 are referred here as follows : 



Wyoming: Near Beulah, Grifhths 412; Inyan Kara, Grifhths 041. 



North Dakota : Dickinson, M. A. Brannon 12;> ; Broncho, L. R. A>'aldroii 

 2232. 



The species is near A. albicans Scribn. tt Smith, but is readily separable 

 by its nearly smooth flowering glume. 



Agropyron sitanioides J. G. Smith sp. nov. 



" Culms erect or ascending, 20 to 30 cm. high, their bases clothed with 

 tumid leaf sheaths; innovations h to 'i the leugtli of the culm, stout, rigid, 

 internodes terete, glabrous. Sheaths closely envelojjing the internodes 

 scarious along the margins, glabrous; ligule obsolete, blades rigid, erect, 

 involute, filiform, sharply-pointed, scabrous on the back, strongly nerved 

 and scal)rous above and on the margins. Spike rigid, erect, long-exserted, 

 5 to <S cm. long. Spikelets strict, erect, few-flowered. Internodes of the 

 rachilla 1 mm. long, hispid. Emi)ty glumes subulate, entire or bifid, 2- 

 nerved, very scabrous along the nerves, with a stout, si^abrous, ascending 

 awn 3 to 4 cm. long; flowering glumes coriaceous, lanceolate, applanate on 

 the back, 8 to i) mm. long, nearly 2 mm. wide, scabrous, with a stout, ascend- 

 ing or spreading awn about 5 cm. long arising from between two short 

 teeth; palet shorter than the flowering glume, obtuse, callus hispid. 

 Internodes of the I'achis compressed, scabrous along the margins, somewhat 

 dilated above, about 4 to 5 mm. long. 



"Tyi)e collected l)y David Griffiths, No. 735, Rapid City, South Dakota, 

 August 28, 1897. Growing on dry knolls. 



This species is doubtfully referred to Agropyron. It agrees withspecies of 

 Sitanion in having the rachis of the s]nke subarticulate at maturity ; the 

 enipt}' glumes bifid, and the flowering glume trifid. It is like Eliimns in 

 the lanceolate empty glumes, scabrous callus of the flowering glume, and 

 scabrous internodes of the rachilla, but the solitary spikelets and opposite 

 empty glumes enclosing the base of the spikelet between them denote a 

 closer generic affinity with Agropyron, although it is not closely related to 

 any of the American species." 



Agropyron flexuosum comb. nov. 



Sii(iiiii)i, jlr.iiiosnin Piper, Erythea 7 : 10. (1809). 



Repeated field observations of this species since its pul)lication, together 

 with the careful study of a large series of specimens, demonstrate that it 

 must be considered a close relative of ytgrropz/ro?! spiatliim (Pursh). It is 

 not at all uncommon to find the spikelets at some of the nodes of the 

 rachis in this last species, for instance in Cusick's No. 1914, from eastern 



