1916] 
GREENMAN—MONOGRAPH OF SENECIO 97 
S. nephrophyllus Rydb. Mem. N. Y. Bot. Gard. 1:446. 1900, 
and in Bull. Torr. Bot. Club 27:183. 1900. 
S. discoideus Nelson in Coulter & Nelson, Manual Cent. 
Rocky Mountains 583. 1909, in part, not S. aureus var. dis- 
coideus Hook. 
An erect herbaceous perennial, glabrous throughout or 
slightly floceose-tomentulose in the axils of the leaves and 
along the midrib on the upper surface of the young leaves; 
stems 1 to 5 dm. high; leaves thickish in texture; basal leaves 
petiolate, subreniform to ovate-oblong, 1 to 6 cm. long, 1 to 
4 em. broad, entire, crenately and unequally lobate-dentate ; 
petioles variable in length from 1.5 em. to nearly 2 dm. long; 
stem-leaves petiolate or sessile, sublyrate to pinnately di- 
vided into remote linear-oblong or subeuneate obtusish, often 
unequal, divisions and deep rounded sinuses; inflorescence 
terminating the stem in a few to several-headed corymbose 
всуше; heads 7 to 10 mm. high, discoid; flowers numerous; 
achenes glabrous. 
Distribution: Montana and Colorado, west to Idaho and 
Oregon. 
Specimens examined: 
Montana: meadows, Big Blaekfoot River, 13 July, 1883, 
Canby 34 (Gray Herb.), and 203 (Phil. Acad. Nat. Sci. Herb.) ; 
Melrose, 6 July, 1895, Shear 5011 (U. S. Nat. Herb.). 
Wyoming: Laramie Plains, alt. 2590 m., 20 July, 1884, 
Sheldon 73 (U. S. Nat. Herb.) ; Laramie, 28 July, 1889, Greene 
(U. S. Nat. Herb. and Field Mus. Herb.); Laramie hills, 17 
July, 1897, Nelson 3404 (Mont. Agr. Coll. Herb.) ; Laramie 
Plains, 21 July, 1898, Osterhout (Field Mus. Herb.); wet 
banks, City Springs, Laramie, 8 Aug., 1901, Nelson 8599 (Gray 
Herb., U. S. Nat. Herb., and Mo. Bot. Gard. Herb.) ; Laramie 
River, along the Medicine Bow Mountains, coll. of 1856, H. 
Engelmann (Gray Herb. and Mo. Bot. Gard. Herb.); wet 
meadows, Centennial, 27 July, 1900, Nelson 7722 (Mo. Bot. 
Gard. Herb.); boggy draws, Centennial, 27 July, 1902, Nel- 
son 8685 (Gray Herb., U. S. Nat. Herb., Field Mus. Herb., 
and Mo. Bot. Gard. Herb.); Wind River bottom, 28 July, 
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