[Vor. 5 
78 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Herb.); Pole Creek, 29 June, 1895, A. Nelson 1364 (Gray 
Herb., U. S. Nat. Herb., and Mo. Bot. Gard. Herb.) ; Green 
River, 1 June, 1897, A. Nelson 3070 (Mont. Agr. Coll. Herb.) ; 
dry slopes, Seminole Mountains, Carbon Co., 21 July, 1898, 
A, Nelson 4918 (U. S. Nat. Herb. and Mo. Bot. Gard. Herb.) ; 
Big Horn Mountains, alt. 2435 m., 1 Aug., 1898, Т. А. Williams 
(U. S. Nat. Herb. No. 519669); Big Horn Mountains, Aug., 
1898, D. Griffiths (Mo. Bot. Gard. Herb.); Shoshone Moun- 
tains, Aug., 1904, H. Hapeman (C. C. Deam Herb.). 
Colorado: Cherokee Park, near Wyoming boundary line, 30 
July, 1917, Johnston Ё Hedgcock 160 (Мо. Bot. Gard. Herb.) ; 
high mountains, Gray's Peak and vicinity, July, 1885, Patter- 
son 80 in part (Gray Herb.). 
119. 8. Harbourii Rydb. Bull Torr. Bot. Club 33: 158. 
1906; Fl. Colo. 396. 1906; Daniels, Univ. Mo. Studies, Sci. Ser. 
2: 399 [251]. 1911. 
S. camus Porter & Coulter, Syn. Fl. Colo. 82. 1874, not 
Hook.; Coulter, Manual Rocky Mountain Region, 210. 1885, in 
part, not Hook.; Nelson in Coulter & Nelson, Manual Cent. 
Rocky Mountains, 580. 1909, in part, not Hook. 
S. canus var. Rothrock, Bot. Wheeler Exp. 177. 1878, not 
S. canus Hook. 
S. Rothrocku Greenm. Monogr. Senecio, I. Teil, 24. 1901, 
and in Engl. Bot. Jahrb. 32 : 20. 1902 
A low cespitose herbaceous рейн, lightly floccose-tomen- 
tose throughout; stems ascending or suberect, 1 to 2.5 dm. 
high, simple or branched, usually leafy ; basal and lower stem- 
leaves oblong-oblanceolate to narrowly oblanceolate, including 
the petiole 2 to 13 cm. long, 3 to 15 mm. broad, rounded to 
obtuse at the apex, entire or crenate-undulate, at first lightly 
floccose-tomentose on both surfaces, later somewhat glabrate, 
rather abruptly narrowed to gradually attenuated into a nar- 
rowly winged petiole, margins more or less revolute; upper 
stem-leaves usually conspicuous, lanceolate-ligulate and ses- 
sile by a more or less ampliated entire or dentate auriculate 
half-clasping base; inflorescence a terminal subcorymbose 
cyme; heads 10 to 12 mm. high, radiate; involuere campanu- 
