Rydberg : Rocky Mountain flora 603 



differs in the narrower second glume, which is scarcely broader 

 than the flowering glume and neither truncate nor cucullate at the 

 apex ; from E. pennsylvanica it differs in the denser inflorescence 

 and the firmer and less acute second glume, which has the texture 

 of that of E. obtusata. In E. pennsylvanica the second empty 

 glume is thin, very acute and with a broad scarious margin. 



A few of the specimens to be referred to this are given here : 

 Montana: East Gallatin Swamps, July 24, 1896, P. A. 

 Rydberg 31 J4 (type) and 3173; Columbia Falls, 1893, R. S. 

 Williams ; Blue Cloud, near Helena, 1887, F. D. Kelsey. 



Colorado: Gunnison, 1901, C. F. Baker 524; Pagosa 

 Springs, 1899, Baker 169; Durango, 1898, Baker, Earle & 

 Tracy 950 (the last determined as Agrostis exarata). 



Poa callichroa Rydb. sp. nov. 



Perennial with a horizontal rootstock, but more or less matted ; 

 culm about 3 dm. high, mostly leafy at the base ; sheaths strongly 

 striate, 2-10 cm. long ; ligules lanceolate or ovate, acute, about 3 

 mm. long ; blades of the lower leaves 6-10 cm. long, 3-4 mm. 

 wide, firm, dark-green, strongly veined ; blades of the upper leaves 

 about 3 cm. long, erect ; panicle 6-9 cm. long, open ; branches 

 mostly in 3's or 4's below, the lowermost 2-3 cm. long ; spikelets 

 6-8 mm. long, 5-7-flowered ; empty glumes lanceolate in side- 

 view, about 5 mm. long, acuminate, purple with greenish or brown- 

 ish margins ; flowering glumes 4-5 mm. long, lanceolate, acumi- 

 nate, with strong nerves, green below, then purple, then brown, 

 and white and scarious above ; nerves and internerves more or less 

 villous ; cobweb at the base present but scant. 



This species is a relative of P. arctica and P. cenisia, but differs 

 from both in the taller habit, broader leaves and larger, 5-7- 

 flowered (instead of 3-4-flowered) spikelets. 



Colorado : Dead Lake, near Pike's Peak, August 14, 1901, 

 F. E. &. E. S. Clements 45 J. 



Poa pudica Rydb. sp. nov. 



Perennial with a short rootstock and often tufted ; culm 2—3 

 dm. high ; lower leaves with short sheaths, which are often rather 

 loose ; ligules truncate, about 2 mm. long ; blades 4-5 cm. long, 

 usually conduplicate, strongly nerved ; sheaths of the stem-leaves 

 5-7 cm. long ; blades 2-4 cm. long, erect; panicle 4-8 cm. long, 



