MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 44 1 



with that species, being easily distinguished by the large basal and 

 small stem-leaves, and by the ample rays. It grows in swampy 

 ground, at an altitude of about 2200 m. 



Montana : Jack Creek, July 15, 1897, Rydberg & Bessey, 52^2. 



Senecio hydrophilus Nutt. Trans. Am. Phil. Soc. (II.) 7: 411 



[Syn. Fl. I-: 387; Man. R. M. 208]. 



In wet meadows and on river-banks, at an altitude of 1500-2500 m. 



Montana: Bozeman, 1895, Rydberg; 284.8; Gallatin, 1882, 

 Canby . 



Yellowstone Park: 1884, Tweedy, iig; 1885, yid; Upper 

 Madison Canon, Aug. 3, 1897, Rydberg d- Bessey, 524J ; Mud 

 ^Springs, 187 1, Hay den Survey. 



* Senecio hydrophiloides. 



Stem tall, from a clump of fibrous roots, simple up to the inflores- 

 cence, glabrous, 6-8 dm. high; lower leaves rather thick, glabrous, 

 lanceolate, with a long winged petiole, sinuately dentate, the upper 

 much reduced, 2-3 cm. long, lanceolate and sessile; cyme more or 

 less compound-corymbiform with divergent branches ; heads almost 

 short-cylindric, about i cm. high ; bracts narrowly linear-lanceo- 

 late, nearly equalling the disk ; rays rather short and few ; achenes 

 light brown, 4-angled, smooth and glabrous. 



Nearest related to S. hydrophilus, from which it differs in the 

 dentate leaves and the open inflorescence. 



Montana: Columbia Falls, 1892, R. S. Williams, pjj. 



Idaho : 1896, A. A. & E. Gertrude Heller, 3474 (type). 



* Senecio Scribneri. 



Stout, 2-3 dm. high, from a short erect rootstock with numerous 

 fleshy fibers ; stem somewhat villous ; basal leaves oval with a some- 

 what winged petiole, 3-4 cm. long; blade 2-3 cm. long, fleshy; 

 stem-leaves linear or linear-oblong, thick, somewhat villous, 6-8 cm. 

 long, obtuse, the lower tapering into a winged petiole, the upper 

 sessile ; inflorescence corymbose, flat-topped ; heads 6-16, 12-15 mm. 

 high, 12-20 mm. in diameter, with a few calyculate bractlets ; bracts 

 numerous, linear-lanceolate, slightly villous, light colored ; rays 

 broad, 12-15 mm. long; achenes sharply angled, glabrous. 



Nearest related to S. aronicoides and S. Hookeri, but differs in 

 the more numerous heads and the narrow leaves. It grows at an 

 altitude of a little over 1500 m. 



Montana: Livingston, 1883, Scribner, I2jb (in the Canby Her- 

 barium). 



