15 



divaricate, 2 to S cm. long. Palea as long as the tioweriug giiiaie, tipped with 

 two slender scabrous awns. Internodes of the rachis scabrous along the mar- 

 gins; 2 to 4 mm. long. 

 Type collected by S. M. Tracy, Xo. 222, Reno. Nev., 1887. 



It differs from any other specimen in the National Herbarium in being densely gray- 

 ish-pubescent throughout. In the character of the spikelets it approaches S. 

 hystrlx. No. 127, Suksdorf, Bickleton, Yakima County, Wash., June 7, 1884, 

 with similar leaves and inflorescences, but the plant less densely pubescent and 

 quite glaucous, may be placed here. Also a specimen collected by Dr. C. H. 

 Merriam on Mount Shasta, California, 1898. 

 12. SITANION HYSTRIX (Nntt.) J. G. Smith, new combination. {JEgilops Injslrix 



Nutt. Gen. N. Am. PI., 1: 86, 1818.) PL II. 

 Culms 1 to 3 dm. high, slender, erect or ascending, scabrous above, clothed at the 

 base with papery leaf-sheaths. Innovations very leafy, one third to two-thirds 

 the length of the culms. Sheaths striate, strigose-pubesceut, o\>en at the throat, 

 closely enveloping the internodes. Ligule almost obsolete. Blades narrowly 

 linear, flat or at length involute, strigose-pubescent throughout, prominently 

 9-nerved, scabrous along the margins, erect or ascending; those of the innova- 

 tions 7 to 12 cm. long, 1 to 2 mm. wide ; culm leaves about as long, 2 to 4 mm. 

 wide. Spike 5 to 7 cm. long, erect or subflexuous, exserted, or its basal portion 

 inclosed in the uppermost leaf-sheath, closely flowered. Spikelets 3- to 4-flow- 

 ered, compressed. Empty glumes bifid, from near the base and unequally 

 2-awued; the strongly scabrous, glaucous, divergent awns, 3 to 4 cm. long. 

 Flowering glume 7 to 8 mm. long, liuear-lancedlate, minutely pubescent, 3-awued, 

 the middle awn rather slender, recurved, about 3 cm. long. Palea as long as or 

 longer than the flowering glume, scabrous, tipped with two slender awns, 2 to 

 3 mm. long. Internodes of the rachis glaucous, linear, not at all dilated above, 

 about 5 mm. long. 

 A common, worthless bunch grass on shale hills and among the sagebrush on the 



high plains from western Colorado to eastern Washington. 

 Specimens examined: JFyomin;/ : P. A. Rydberg, No. 2028, Wamsutter, July 24, 

 189.5; C. L. Shear, No. 280i, Wamsutter, June 24, 189.5; No. 283, Green River, 

 June 25, 1895; Thomas A. Williams, No. 2437, dry rocky hillsides; Evanston, 

 July 10, 1897; No. 2379, dry sagebrush hills. Green River, July 9, 1897; Aven 

 Nelson, No. 3058, Green River Hills, May 31, 1897; No. 3669, Wamsutter, July 

 10, 1897; No. 3784, North Vermilion Creek, July 20, 1897. 

 Washington: C. V. Piper, No. 2579, on sagebrush land, Ellensburg, July 9, 1897. A. B. 



Leckenby, Walla Walla, July 12, 1898. 

 Colorado: John Wolfe, No. 623, 1873 ; C. Thomas, 1869 ; and F. E. Clements, No. 60, Wal- 



senburg, July 10, 1896. 

 There are in the herbarium of the Philadelphia Academy of Science two of Nuttall's 

 specimens of SUanion. One of these, labeled " Chretomeris trichoides, R. Mts. 

 Platte," is exactly identical with No. 3784, A. Nelson, and No. 283, C. L. Shear, 

 both collected in the Red Desert of Wyoming. The other, labeled "Elijmus 

 difformi.% R. Mts. Platte," is nearly identical with No. 2028, Rydberg, from Wam- 

 sutter, Wyo. If these specimens are those from which Nuttall's description of 

 JEgilops hyatrix was drawn, and they agree lietter with liis description than any 

 specimen from the "arid plains of the Missouri "so far examined, then there was 

 undoubtedly a mistake made iu referring the habitat of this to that locality. 

 I am assured by Dr. E. L. Greene that it is highly improbable that Rafiuesque drew 

 his description of S. ehjmoides from Nuttall's plant, and it is certain that Rafln- 

 esque's description (Jouru. Phys. 89 : 1819) differs in important particulars from 

 that of J'lgUops hjistrix, Nuttall. I am, however, unable definitely to identify any 

 SUanion with which I am familiar as the true S. elymoides, Raf. The locality, 

 "Missouri," of 1819, was then applied to what now constitutes several largo 



