[Vor. 5 
48 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Herb. and Mo. Bot. Gard. Herb.) ; Organ Mountains, 25 April, 
1907, Wooton 3370 (Mo. Bot. Gard. Herb.) ; Lake Valley, coll. 
of 1915, Mrs. W. G. Beals (U. S. Nat. Herb.). 
104. 8. mutabilis Greene, Pittonia 4:113. 1900; Greenm. 
Monogr. Senecio, I. Teil, 24. 1901, and in Engl. Bot. Jahrb. 32 : 
20. 1902; Nelson in Coulter & Nelson, Manual Cent. Rocky 
Mountains, 583, 1909, in part, excl. synonymy; Wooton & 
Standley, Contr. U. S. Nat. Herb. 19 : 747. 1915. 
S. cognatus Greene, Pittonia 4 : 114. 1900. 
S. aurellus Rydb. Bull. Torr. Bot. Club 27 : 182. 1900. 
An herbaceous perennial, usually loosely floccose-tomentu- 
lose; stems one to several from an ascending or perpendicu- 
lar rootstock, erect or nearly so, 1.5 to 4 dm. high; leaves 
obovate to oblanceolate, including the petiole 2 to 12 em. long, 
.9 to 1.5 em. broad, rounded at the apex, subentire, dentate or 
sublyrate, at first white-tomentulose on both surfaces, later 
more or less glabrate; stem-leaves similar, more or less re- 
duced, oblanceolate to narrowly lanceolate, distinctly petiolate 
to sessile, somewhat laciniate to entire; inflorescence a termi- 
nal few to several-headed corymbose cyme; heads 8 to 10 mm. 
high, radiate; involucre campanulate, sparingly calyculate, 
glabrous or slightly tomentulose; bracts of the involucre 13 to 
21, linear-lanceolate, 5 to 7 mm. long; ray-flowers 8 to 12, rays 
yellow ; disk-flowers 40 to 60; achenes hispidulous. 
Distribution: Colorado to Arizona. 
Specimens examined: 
Colorado: Arboles, June, 1899, C. F. Baker 712, 713 (Greene 
Herb., Univ. of Notre Dame, Gray Herb., Berlin Herb., and 
Mo. Bot. Gard. Herb.) ,ттре; Los Pinos, Мау, 1899,C. F. Baker 
(Gray Herb., U. S. Nat. Herb., and Mo. Bot. Gard. Herb.) ; 
Cimarron, alt. 2000 m., 6 June, 1901, C. F. Baker 19, 33 (Gray 
Herb., U. S. Nat. Herb., and Mo. Bot. Gard. Herb.) ; Marshall 
Pass, alt. 3045 m., 19 July, 1901, C. F. Baker 516 (Gray Herb., 
Univ. Calif. Herb. U. S. Nat. Herb, and Mo. Bot. Gard. 
Herb.) ; Rico, alt. 2895 m., 1 July, 1898, Colo. State Agr. Coll. 
3046 (U. S. Nat. Herb.) ; Surface Creek, Delta Co., alt. 2040 
