` 
15 
divaricate, 2 to 3 cm. long. Palea as long as the flowering glume, tipped with 
two slender scabrous awns. intende of the rachis scabrous along the mar- 
gins; 2 to 4 mm. lon 
Type collected by S. M. Tracy, No. 222, Reno, Nev T. 
It differs from any other specimen in ay National 1 in being densely gray- 
ish-pubescent throughout. In the character of the spikelets it approaches S. 
hystrix. No. 127 „ fiuksdorf, entm. Yakima County, Wash., June 7, 1884, 
with similar Saves and inflorescences, but the plant less densely 1 and 
quite uc e may be placed here. Also a specimen collected by Dr. C. H. 
Merriam on Mount Shasta, California, 1898. 
12. SITANION HYSTRIX (Nutt.) J. G. Smith, new combination. (Ægilops hystrix 
Nutt. Gen. N. Am. Pl., 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 two-thirds 
the length of the culms, Sheaths striate, strigose-pubescent, open at the throat, 
closely enveloping the internodes. Ligule almost obsolete. Blac ^i narrowly 
linear, flat or at length involute, strigose-pubescent throughout, prominently 
9-nerved, scabrous along the margins, erect or ascending; those of the innova- 
longer than the flowering glume, scabrous, tipped with two slender awns, 2 to 
3mm. long. Internodes of the rachis gium, linear, not at all dilated above, 
. long. 
A common, worthless bunch grass on shale hills and among Ad sagebrush on the 
high plains from western Colorado to eastern Washing 
SPECIMENS scr iro Wyoming: P. A. Rydberg, No. 2028, go oR July 24, 
1895; C. L. Shear, No. 2803, Wamsutter, June 24, 1895; No. 283, Green River, 
June 95, 1895; Thomas A. Williams, No. 2437, dry rocky hillsides, Evanston, 
July 10, 1897; No. 2319, dry sagebrush hills, ben River, July 9, 1897; Aven 
Nelson, No. 3058, Green River Hills, May 31, 1897; No. 3669, Wamsutter, July 
0, 1897; No. 3784, North Vermilion Creek, July 20, 1897. 
iere C. V. Piper, No. 2579, on sagebrush land, Ellensburg, July 9, 1897. A. B. 
enby, Walla Walla, July 12, 1 
ee i Joha Wolfe, No. 623, 1873; C. Phos, 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 Sitanion. 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 ‘‘ Elymus 
difformis, 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 
Ana hystrix was drawn, and they agree better w p his sire a than any 
specimen from the * arid plains of the Missouri” so far e mined, then there was 
his description of S. elymoides pee Nuttall's plant, and it is bem mee Rafin- 
esque's description (Journ. Phys. 1819) differs in import from 
that of Ægilops hystrix, Nuttall. 125 5 unable cope to dite any 
Sitanion with which I am familiar as the true S. elymoides, Raf. The locality, 
* Missouri," of 1819, was then applied to gres now constitutes several large - 
