Rvdberg : Rocky Mountain flora 535 



leaf-blades 2-5 cm. long, 3-5 mm. wide, abruptly acute, spread- 

 ing, dark green ; inflorescence short, open, 4-5 cm. long ; branches 

 in 2's to 4's, spreading, 1-2 cm. long, spikelet-bearing above the 

 middle ; spikelets light green, strongly compressed, about 6 mm. 

 long, 2-4-flowered ; empty glumes glabrous, but scabrous on the 

 veins, lanceolate, the first 3 mm. long, 1 -nerved, the second 4 mm. 

 long, 3-nerved ; floral glumes lanceolate, scabrous-strigulose, 

 strongly 5 -nerved, 5 mm. long. 



This species is related to P. occidentals (Vasey) Rydb. (P. 

 flexuosa occidentalis Vasey), but differs in the short ligules and the 

 short broad leaves. 



Wyoming : Spread Creek, at an altitude of 2900 m., July, 

 1897, F. Tweedy ij (type, in herb. N. Y. Bot. Gard.). 



Poa subreflexa sp. nov. 



Perennial, with a horizontal rootstock ; stem ascending, 5-6 dm. 

 tall ; lower sheath finely and retrorsely strigulose ; ligules very 

 short and truncate ; leaf-blades flat, flaccid, 7-10 cm. long, 3-4 mm. 

 wide, spreading ; panicle open, about I dm. long ; branches re- 

 flexed, the lower in 3's or 4's, 1-3 cm. long ; spikelets pale green, 

 6-7 mm. long, 3- or 4- flowered ; empty glumes glabrous, with 

 broad scarious margins, lanceolate, the first 1 -nerved, about 3 mm. 

 long, the second 3-nerved and about 4 mm. long ; flowering 

 glumes lanceolate, 5 mm. long, scabrous-strigulose, strongly 5- 

 nerved. 



This species is related to P. Wheeled and P. Olncyae, but dif- 

 fers from both in the reflexed branches of the panicle and the 

 broad flaccid leaves. 



Colorado : In shade of spruces on the bank of a creek, moun- 

 tains north of Steamboat Springs, July 26, 1891, State Agricul- 

 tural College distribution no. jyji (type, in herb. N. Y. Bot. 

 Gard.). 



Poa subtrivialis sp. nov. 



Perennial, with a rootstock ; stem slender, 4-6 dm. high, 

 smooth ; ligules very short and truncate ; sheaths narrow, striate, 

 exceeding the nodes; leaf-blades erect, flaccid, 8-15 cm. long, 

 about 2 mm. wide, flat, dark green ; panicle narrow, 1-2 dm. 

 long ; branches erect, scabrous, spikelet-bearing above the mid- 

 dle ; spikelets light green, 3-4 mm. long, 2-3-flowered ; first 

 empty glume very narrow, 2 mm. long, smooth ; the second lan- 

 ceolate, 2.5 mm. long, prominently 3-nerved; floral glumes 2.5 

 mm. long, glabrous, obscurely nerved ; cobweb very scant. 



