438 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Yellowstone Park : Mt. Norris and Soda Butte, 1885, Tzueedy, 

 yi8; Electric Peak, Aug. 18, 1897, Rydbcrg & Bessey, S2j8; 

 Hood's Basin, 1897, P. Koch. 



Idaho : Mt, Chauvet, July 29, 1897, Rydhei-g & Bessey, S^37- 



* Senecio occidentalis rotundatus. 



Stem slightly over i dm. high ; leaves rounded-spatulate, slightly 

 sinuate, not toothed ; heads somewhat larger and broader, and the 

 bracts broader, oblong, and abruptly acute. 



May be a good species, but the material is rather meagre. 

 Montana AND Idaho: Mt. Chauvet, July 29, 1897, Rydherg & 

 Bessey, 5268. 



Wyoming: Breccia Peak, 1897, Tweedy, ^8q. 



Senecio triangularis Hook. Fl. Bor. Am. i^ : 332 [Syn. Fl. i'^ : 386 ; 



Man. R. M. 208; Bot. Cal. i: 414]. 



Commonon creek-banks and in water, at an altitude of 1000-2000 m. 



Montana: Bear Creek Canon, 1892, W. T. Shazv ; Columbia 

 Falls, 3frs. Kennedy 2j; Gallatin Co., 1886, Tzveedy, 11 16; 

 Spanish Basin, 1896, Flodman, gi6; Bozeman, 1895, Rydherg & 

 Bessey, 28^^; Spanish Basin, July i, 1897, Rydherg & Bessey, 

 3242; Little Belt Mts., 1883, Scrihner, 122; Red Lodge, 1898, 

 Williams iS: Griffith. 



Yellowstone: Park: East DeLac3''s Creek, Aug. 10, 1897, 

 Rydherg & Bessey, §240 and 3243 (a form with ovate leaves and a 

 smaller corymb). 



Idaho : Henry's Lake, Jul}^ 31, Rydherg & Bessey, 3241 . 



* Senecio saliens Rydberg, Bull. Torr. Bot. Club, 24: 298. 



Differs from S. triangularis in the lower stature, and the smaller 

 thick rather fleshy leaves with fewer and less pointed teeth. It is a 

 mountain plant growing among rocks, at an altitude of 2000 m. or 

 more. 



Montana: Granite, 1892, F. D. Kclsey ; Yogo Baldy, 1896, 

 Flodman, gi<^ (type); McDonald's Peak, 1883, Canhy, 202. 



Yellowstone Park : 1885, Tzveedy, y2i. 



* Senecio variifolius. 



Stem very tall, i m. or more high, glabrous, angled, branched 

 above ; lower leaves comparatively firm, glabrous, cordate, doubly 

 and irregularly dentate with large salient teeth, distinctly petioled, the 

 blade often over i dm. long, the upper ovate, short-petioled or sessile ; 



