444 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



* Senecio latus. 



Stem stout and tall, 6-8 dm. high, striate, more or less densely 

 covered with long white crisped hairs; lower leaves about i dm. 

 long, broadly oblanceolate, sinuately toothed, tapering into a short 

 winged petiole, on the upper surface covered with long white 

 hairs, the lower surface almost glabrate except the midrib and mar- 

 gins ; upper leaves similar, but rather more strictly lanceolate, and 

 more or less clasping by a broad base ; inflorescence a large com- 

 pound cor3'mb, about 3 dm. high and 2 dm. wide ; involucral bracts 

 short, scarcely more than half the length of the fulh^ developed disk, 

 rather flesh}^, oblong, abrupdy contracted into a slender dark point ; 

 achenes greenish, glabrous, bluntly angled and striate, about as long 

 as the white pappus. 



In size and habit it most resembles S. atrattis Greene, from Colo- 

 rado, but differs in the large open compound corymb, the short 

 fleshy bracts, and the different pubescence, which cannot by any 

 means be said to be tomentose. The same characters, together with 

 the size, separate it from S. foliostis. 



Montana : Columbia Falls, Mrs. J. J. Kennedy, 28 (type, in 

 the herbarium of Montana Agricultural College, Bozeman.) 



* Senecio solitarius. 



Stem from a bunch of fibrous roots, 3—4 dm. high, simple, glab- 

 rous, monocephalous ; lower leaves thin and glabrous, their bhides 

 oval, subentire, about 5 cm. long, produced downward into a 

 winged petiole of about the same length ; middle leaves lanceolate, 

 with a clasping base, the uppermost reduced, very small and subu- 

 late ; head nearly 2 cm. high, borne on the somewhat enlarged end 

 of the stem ; bracts very numerous, very narrowly linear, tipped with 

 black; rays light yellow, almost 1.5 cm. long; achenes dark brown, 

 glabrous and striate. 



In habit it resembles most S. integern'nius, and may be taken for 

 a monocephalous form of that species, but the leaves are much thin- 

 ner, the upper ones much more reduced and subulate, the heads 

 larger, and the bracts more numerous and narrower. 



Yellowstone Park: 1885, Frank T-weedy, 8ij. 



Senecio canus Hook. Fl. Bor. Am. i : 333 [111. Fl. 3: 477 ; Syn. 



Fl. i': 390; Bot. Cal. i: 412; Man. R. M. 210]. 



On mountain-sides, up to an altitude of 2500 m. 



Montana: Anaconda, 1892, F. D. Kelscy ; Granite, 1892, Kel- 

 sey ; Great Falls, 1891, R. S, Williams, jS ; Little Belt Mts., 1896, 

 Flodman, goy ; Little Belt Mts., 1883, Scribner, 121 ; Mt. Helena, 

 1883, Canby, 20^. 



