PAMMEL — NOTES ON GRASSES OF NEBRASKA, ETC. 245 



A. violaceum Vasey. Sheridan County, west branch of the Big Goose 

 River on road to Shoshone Basin, altitude 8,500, in dry open woods. No. 142. 



Hordeum ccEspiiosum Scribn. n. sp. An erect, caespitose perennial, 3-5 dm. 

 high with smooth culms and sheaths and terminal bearded spikes 4-7 cm. 

 high. Ligule short, hardly i mm. long, very minutely fringed, broader than 

 the flat, striate, scabrous, very acute leaves which are 5-15 cm. long and 3-5 

 cm. wide. Empty glumes subulate from the base, about 20 mm. long in- 

 cluding the awns ; the central floret nearly sessile, lanceolate fusiform, 

 about 6 mm. long exclusive of the awn, which is 12 mm. in length, the lat- 

 eral spikelets raised on short pedicels, as are the rudimentary florets of the 

 lateral spikelets. 



■ This species is chiefly distinguished from //. pratcusr Huds. by its longer 

 and more slender awns and rather shorter flowering glumes. The glumes 

 in H. cccspitosum are less scabrous and the shorter awns much more diverg- 

 ent. From H. jiihatum this species is at once distinguished by its very much 

 shorter awns and different habit of growth, and slender spikes. 



Edgemont, South Dakota. No. 143. Pammel, June 24, i8q7 ; also Geran- 

 ium Park, Wyoming. No. 157. L. H. Pammel, July, 1897. Common in the 

 Rocky Mountain region. 



H.juhatum L. Alma, altitude 1,950, a weed in fields. No. 107. Oxford, 

 altitude 2,085. ^o. 103. Hastings, altitude 1,943. No. ig8. Aurora, alti- 

 tude 1,803. A common weed everywhere. No. 102. Broken Bow, altitude 

 2,478. No. 106. New Castle, altitude 4,019, common. No. 105. Sheridan, 

 altitude 3,862. No. 103. 



H. pusiUnm Nutt. Grand Island, altitude 1,872. Common in streets. 

 No. loi. 



Secale cereale L. Aurora, altitude 1,800. An escape along railroads. No. 

 17. Grand Island, altitude 1,872. Also a frequent escape in streets. No. 175. 



Elymus canadensis L. Alma, altitude 1,959. Common in dry soils. No. 

 45. Hastings, altitude 1,950. No. 186. Sheridan, altitude 3,612. No.i(;8,2io. 



E. condensatiis Presl. New Castle, altitude 4,019. A large and beautiful 

 grass growing along the borders of woods. No. 49. Sheridan, altitude 3,732. 

 Flood plains of Little and Big Goose River. No. 174. Big Horn, Sheridan 

 County, altitude 4,009. Along irrigation ditches and in meadows. No. 49- 



E. glaiicus'^MzW. Sheridan County, Geranium Park, altitude 6,500-7,000, 

 common in open parks. No. 46. 



E. rohustus S. & S. Broken Bow, prairies, altitude 2,478. Small form. 

 No. 145. 



E.striatusV<l\\\i\. Alma, altitude 1,950. In woods and small canons. No .44. 



E. virginicus L. Alma, altitude, 1,950. Low rich woods, along Rejuibli- 

 can River near the foot-hills. No. 47 is a glaucus form ; No. ico, from the 

 same place but in open woods and higher ground. Sheridan, altitude 3,712. 

 No. 205. 



Sitanion elymoides Raf. New Castle, altitude 4,019, common in dry soil. 

 No. 50. 



[Proc. D. A. N. S., Vol. VII.] 30 [May 4, 1899.] 



