18 



obsolete. Blades 5 to 10 or rarely 12 cm. loug, 3 to 4 mm. wide, linear, acumi- 

 nate, flat or involute, rigid, divergent or ascending, smootli and glaucous on 

 the hack, scabrous-pubescent along the prominent nerves above. Spike 7 to 15 

 cm. long, loosely few-llowered, long-exserted. Empty glumes stout, setaceous, 

 divergent, 5 to 9 cm. long, smooth and shining and often glaucous at the base, 

 scabrous above. Flowering glumes 8 to 10 mm. long, linear-lanceolate, glau- 

 cous, scabrous throughout, rounded on the back below, nerved above, entire, 

 tipped with a stout, scabrous, spreading awn 4 to 8 cm. long. Palea as loug as 

 the flowering glume, scabrous on the margins above, obtuse. .Joints of the 

 rachis compressed, glaucous, 5 to 10 mm. long, linear. Closely related to S. 

 longifoUitm, but the culm leaves shorter and more rigid and the innovations less 

 than half as long as the culms. 



Type collected by J. W. Toumey, No. 797, Tucson, Ariz., 1892. 



Specimens kxamined, Colorado: Tracy, Earle & Baker, No. 4274, Hamora Lake, 

 July 24, 1898; No. 429, Mancas, July 8, 1898; No. 4272, Durango, July 18, 1898. 

 C. L. Shear, No. 1087, Breckeuridge, August 29, 1896; No. 1070, Dillon, August 

 26, 1896; No. 612, Georgetown, August 17, 1896; No. 997, Westcliffe, August 12, 

 1896; No. 912, Marshall Pass, July 27, 1896; No. 1003, Buena Vista, August 15, 

 1896; No. 814 and 833, Veta Pass, July 13, 1896; No. 1096, Como, September 1, 

 1896; No. 1240, Animas Canyon, August 5, 1897. P. A. Eydberg, No. 2414, 

 Georgetown, August 20, 1895 ; No. 2.509, Boulder, September 3, 1895. Shear & 

 Bessey, No. 1407, Egeria Park, August 4, 1898. Patterson, Georgetown, 1875. 



Wyoming : Thomas A. Williams, No. 2573a, Iron Mountain, July 2, 1897, and No. 

 2621, Bear Lodge, July 23, 1897; A. Nelson, No. 3952, Albany County, August 

 9, 1897. 



Utah: Marcus E. Jones, No. 56636d, Marvine Laceolite, July 23, 1894; No. 568466, 

 Mount Ellen, Henry Mountains, July 25, 1894, and 5770^), Fish Lake, August 7, 

 1894. 



18. SITANION LONGIPOLIUM J. G. Smith, sp. nov. 



Culms 3 to 5 dm. high, stout, ascending, somewhat geniculate at the base, glaucous. 

 Leaves of the innovations 1.5 to 3 dm. long, attenuate, involute, often as long 

 as the culms. Nodes glabrous. Sheaths scabrous and glaucous, or more or less 

 strigose-pubescent, or sparselj^ hirsute, longer than the internodes, loose, open 

 at the throat, scarious along the margins above. Ligule entire, almost obsolete. 

 Blades linear, long, attenuate, acuminate, striate, smooth and glaucous or pubes- 

 cent, or sparsely hirsute on tlie back, 1 to 2 dm. long, 1 to 3 or 4 mm. wide. 

 Spike Hubflexuous or somewhat nodding, 1 to 1.3 dm. long, rather loosely flow- 

 ered, its base inclosed in the inflated uppermost leaf-sheath. Spikelets 2 or 

 rarely 3 at each node. Empty glumes subulate setaceous, divaricate, scabrous, 

 6 to 8 cm. long. Flowering glumes 8 to 11 mm. long, scabrous, glaucous, 

 rounded on the back below, keeled above, entire or minutely trifid, tipped with 

 a stout, scabrous divaricate awn 5 to 6.5 cm. long. Palea as long as the flower- 

 ing glume, obtuse or bicuspidate, scabrous on the nerves above. Internodes of 

 the rachis compressed, glaucous, 6 to 8 nmi. long. Closely related to ^S. hrevi- 

 folium, from which it may be distinguished by the long attenuate flexuous leaves 

 of the culms and innovations and by the subflexuous spikes, inclosed at the 

 base in the uppermost leaf-sheaths. 



Type collected by C. L. Shear, No. 1213, near Silverton, Colo., August 4, 1897, among 

 rocks on the open sides of a canyon, altitude 3,000 m. 



Specimens examined, Colorado: J.Wolfe, No. 1161-2-3, Denver, 1878. C. L. Shear, 

 No. 1152 and No. 11.58, Ouray, .July 4, 1897; No. 886, Villa CJrove, July 24, 1897; 

 No. 836, Veta Pass, July 15, 1896; No. 717, Idaho Springs, August 27, 1895. M. E. 

 Jones, No. .531, Idaho Si)ring8, August 1, 1878. Tracy, Karle .V Baker, No. 4275, 

 Chicken Creek, .July (I, 1898. P. A. Rydl)erg. No. 21lt7, Idaho Springs, August 

 28, 1895. 



Kansan: C. H. Thompson, No. 21, Ulysses, June 26, 1893. 



