50 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Montana: Old Hollovvtop, Pony, July 9, 1897, Rydbci-g <f- 

 Besscy, 3646 (depauperate form); Mt. Chauvet, July 29, jdj/;" 

 1883, Scribner, jSg; Upper Marias Pass, 1883, Canby, 372 ; Little 

 Belt Mts., 1883, Scribner, jSg. 



Yellowstone Park: East DeLacy's Creek, Aug. 10, 1897, 

 Rydberg & Bessey, 3643 : Electric Peak, Aug. 18, 3632. 



* Poa nervosa (Hook.) Vasey, 111. N. A. Gr. 2: part 2,81; Fcstuca 



nervosa Hook. Fl. Bor. Am. 2: 251. 



It is distinguished by its broad, flat culm leaves, flattish, 3-8-flow- 

 ered spikelets, and the rather distant and prominently 5-nerved 

 floral glumes. It is a rare plant, growing at an altitude of 1000- 

 2000 m, 



Montana: Jefferson Cit}-, 1883, Scribner^ 3^3 in part; Mc- 

 Donald's Peak, 1883, Cajibv, 3yg : Bozeman Pass, j/cJ. 



Yellowstone Park: 1885, Lcttcrman, 6/. 



Poa occidentalis (Vasey) ; Poa iicxitosa occidcntalis Vase}'^ ; Roth- 

 rock, Rep. U. S. Geol. Surv.'6: 290. 1878 [Man. R. M., 422] ; 

 not P. occidcntalis Y2iS&y. 1893. 

 A rare plant growing in rich, moist soil at an altitude of about 



2000 m. 



Montana : Helena, 1888, Kclscy. 



* Poa laevigata Scribn. Bull. U. S. Dept. Agric. Div. Agrost. 5:31; 



Poa laevis Vase}', Cont. U. S. Nat. Herb, i : 273 : not R. Br. 



Nearly related to P. Btickleyana^ but the whole plant pale and shin- 

 ing ; basal sheaths rather rigid ; leaves short and rigid, strongly re vo- 

 lute. Hillsides, benchlands and dry valleys at an altitude of 2000- 

 3000 m. 



Montana: Red Rock, 1895, Shear ^ 323 ; Melrose, July 6, 343 

 and j-^c?; Pydberg, 2og6 and 2og-/ : Deer Lodge, 2i2g: Shear, 363 

 and 374; Lima, Rvdberg; 2320; 1883, Scribner, 3g6 ; Cliff Lake 

 July 27, 1897, Rydberg d: Bcssey, 3636. 



Yellowstone Park: Yellowstone Lake. 1885, Tzi'cedy, 643. 



*Poa lucida A^asey, Cont. U. S. Nat. Herb, i : 274. 



Ver}' nearly related to the preceding and scarcely distinct. It is 

 characterized by the unequal empty glumes, and the membranous 

 decurrentligules which are about 4 mm. long. It grows on hillsides 

 and dry valleys, at an altitude of 2000-3000 m. 



Montana: Lima, 1895, Shear, 362 ; Rydberg, 2312: Elk Mts., 



