MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 69 



erally only two and often but one at each node, and the flowering 

 glumes of a firmer texture. It seldom forms big bunches like E. con- 

 densatus and grows more commonly in the meadows. 



Montana: Dillon, 1895, Shear ^ 33^^' Rydberg^ 2076, sjoo; 

 Madison River, 22"/^ and 22yg. 



CYPERACEAE. 



Cyperus inflexus Muhl. Desc. Gram. 16 [111. Fl. i : 237] ; Cy ferns 

 aristatiis Boeckl. Linnaea, 35 : 500 ; not Rottb. [Man. R. M. 

 366 ; Bot. Cal. 2 : 214]. 

 In sandy soil at an altitude of 1500 m. 

 Montana: Big Timber, 1892, Mrs. Btisha. 



* Cyperus acuminatus Torr. & Hook. Ann. Lye. N. Y. 3: 435 [111. 

 Fl. I : 239; Bot. Cal. 2 : 214]. 

 In moist sandy soil at an altitude of about 1000 m. 

 Montana: Great Falls, 1891, /?. S. Williams ^ S62. 



Eleocharis palustris (L.) R. Br. Prod. 224. [Man. R. M. 369; 

 111. Fl. I : 251 ; Bot. Cal. 2 : 221] ; Scirpiis palustris L. Sp. PI. 



47. 



Common in swamps up to an altitude of 2500 m. 



Montana: Manhattan, 1895, Shear, 408; Rydberg, 2208; Dillon, 

 2oyg; Townsend, 2i^y; Great Falls, 1886, R. S. Williams, ^gg. 



Yellowstone Park : Yellowstone Lake, Aug. 12, 1897, Ryd- 

 berg & Bessey, j8og s.ndj8io; Hot Springs, 1885, Tweedy, 66 j. 



* Eleocharis thermalis. 



Eleocharis olivacea Coulter, Man. R. M. 369 in part; not Torr. 



Perennial from a slender creeping rootstock, mostly tufted and 

 matted, yellowish green; culm 3-10 cm. high, somewhat flattened, 

 striate ; upper sheath with a hyaline limb ; head obovate, obtuse, 

 about 4 mm. long and 3 mm. in diameter, light yellowish green; 

 scales very thin, ovate, acutish ; achenes lenticular, broadly obovate, 

 dark brown, smooth and shining, about i mm. long, about 4 times 

 as long as the conic acute tubercle. 



This is nearest related to E. ochreata and E. olivacea, but differs 

 from both in the obtuse spikes and the light green and usually yel- 

 lowish culm and spike. From the former, it differs in the non- 

 triangular culm, and from the latter in the light-colored scales. 

 It grows in the warm streams and pools, and is generall}- immersed. 



