90 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



It differs from the next in the smaller greener heads and erect, not 

 divergent, leaves. On river banks up to an altitude of 1800 m. 



Montana: Deer Lodge, 1895, Bydberg, 2116: Manhattan, ^'207; 

 Shcai', 444; Melrose, J^vdhcrg, 22y2: East Gallatin Swamps, 1896, 

 Flodman, jjy; Great Falls, 1886, R. S. Williams^ joj ; East Gal- 

 latin, 1896, Rydbcrg, J186. 



Juncus Torreyi Coville, Bull. Torr. Bot. Club, 22 : 303 [111. Fl. i : 



392] ; Juncus nodosus megaccpkalus Torr. Fl. N. Y. 2 : 326 [Man. 



R. M. 358 ; Bot. Cal. 2 : 208] ; Juncus niegacephahis Wood, Bot. 



Ed. 2, 724, 1861 ; not M. A. Curtis, 1835. 



In or near water up to an altitude of 1500 m. 



Montana: Gallatin, 1895, Shea?-, jjj ; Great Falls, 1886, 7?. 

 S. Winiains, jjg; Fridley, 1887, Tzueedy, ijj. 



* Juncus Tweedyi. 



Juucus Canadensis coarctatus Coulter, Man. R. M. 358, at least 

 as to the Yellowstone Park specimens. 



Stem about 3 dm. high, strict, light green, 2-3 mm. in diameter; 

 leaves terete or slightly flattened, more or less distinctly septate, 

 with conspicuous scarious sheaths, the basal ones short ; stem leaves, 

 except the upper ones, about i dm. long : heads in a contracted 

 panicle, brown and shining, 5-8-tlowered ; perianth-segments sub- 

 equal, about 4 mm. long, narrowly lanceolate, acute or acuminate ; 

 bracts ovate, cuspidate-acuminate; stamens 3, about two-thirds as 

 long as the perianth ; anthers much shorter than the filaments ; 

 style rather short : capsule dark brown and shining, oblong, acute, 

 sharply 3-angled, about one-fourth longer than the perianth ; seeds 

 light-colored, about i mm. long, tailed at both ends. 



It is perhaps nearest related to J. Canadensis, but differs in the 

 more contracted panicle, the larger and browner flowers, the shorter 

 and thicker, less acuminate and very dark brown pods. In general 

 habit, it resembles more ./. Xcvadensis, but is stouter and has only 3 

 stamens. It grows in bogs at an altitude of 2100 m. 



Yellowstone Park : 1884, Tzcccdy, 223 (type); Mud Springs, 

 187 1, Adams. 



* Juncus Nevadensis Wats. Proc. Am. Acad. 14: 303 [Bot. Cal. 



2: 209]. 



This belongs to the same group as J. Canadensis, but is more slen- 

 der, with fewer and few-flowered heads, and the flower has 6 stamens. 

 It is found in mountain meadows at an altitude of 1800-2500 m. 



