RYDBERG: STUDIES ON THE ROCKY MounrtraAIN FLORA 103 
Professor Nelson, in the New Manual, includes Sporobolus 
vaginaefolius and Cinna arundinacea, which I think are erroneously 
reported for the region. : 
The following species of Calamagrostis have to be included in 
the Rocky Mountain flora: C. Vaseyi in Montana, C. rubescens 
and C. lucida in Wyoming. 
Professor Nelson reduced Avena americana to a synonym of A. 
Mortoniana. I think they are distinct, but if united, they should 
bear the name Avena Hookeriana, an older name for the former. 
Arrhenatherum elatius has been collected in Colorado, and Dan- 
thonia spicata is common in the Black Hills. 
Deschampsia pungens sp. nov. 
A densely tufted perennial; stem 3-4 dm. high, glabrous and 
shining; basal leaves numerous, the old subchartaceous sheaths 
from preceding season remaining, strongly striate, glabrous, often 
slightly tinged with purplish; ligules triangular-lanceolate, 4-5 
mm. long: blades spreading, more or less arcuate, strongly involute, 
bluish green or in age straw-colored, strongly striate, minutely 
scabrous-pruinose, stiff and with a callous pungent point; stem 
leaves few; blades 2-5 cm. long, similar; panicle open, branches 
il age spreading; peduncle and its branches more or less purplish, 
glabrous or minutely scabrous; empty glumes subequal, 3.5-4.5 
mm. long, lanceolate, acute, purple, with scarious margins; rachis 
long-hairy; floral glumes 3~3.5 mm. long, similar to the empty 
glumes; awn attached near the base, equaling or barely exceeding 
the floral glume, j 
This species is closely related to D. caespitosa but differs in the 
stiff, involute, pungent-pointed leaves and in the position of the 
dorsal awn of the floral glumes. This is attached near the base of 
the glume, while in D. caespitosa it is attached one fourth or one 
fifth the distance from the base. It grows near hot springs. 
ALBERTA: Along stream below warm sulphur springs, vicinity 
: a July 10, 1899, McCalla 2309 (type in herb. N. Y. Bot. 
ard.), 
Wyominc: Lower Geyser Basin, Yellowstone Park, August 4, 
1897, Rydberg & Bessey 35090. 
Chloris brevispica Nash has been collected at Wray, Colorado, 
and Blepharidachne Kingii (S. Wats.) Hackel (Eremochloa Kingit 
