Rydberg: Studies on the Rocky Mountain flora 103 



Professor Nelson, in the New Manual, includes Sporoboliis 

 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 fiora: 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 elatiiis 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 

 in 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. 



This species is closely related to D. caespitusa 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 

 of Banff, July 10, 1899, McCalla 2joQ (type in herb. N. Y. Bot. 

 Card.). 



Wyoming: Lower Geyser Basin, Yellowstone Park, August 4, 

 1897, Rydberg & Bessey 3590. 



Chloris brevispica Nash has been collected at Wray, Colorado, 

 and Blepharidachne Kmgii (S. Wats.) Hackel {Eremochloa Kingii 



