1917] 
GREENMAN—MONOGRAPH OF SENECIO 17 
apex to sublyrately pinnatifid, lightly floccose-tomentulose to 
glabrous; upper stem-leaves sessile, pinnately divided into 
linear-oblong and subentire to obovate-cuneate obtusely or 
acutely dentate rather remote divisions, occasionally much 
reduced; inflorescence a terminal few to several-headed 
corymbose cyme; heads 8 to 10 mm. high, radiate; involucre 
campanulate, sparingly calyculate, glabrous; bracts of the 
involucre usually 13, linear-lanceolate, acute, 5 to 8 mm. long; 
ray-flowers 5 to 8, rays yellow; disk-flowers 20 to 40; achenes 
hirtellous. 
Distribution: southwestern Wyoming to New Mexico, west 
to Nevada. 
Specimens examined: 
Utah: “оп the Uinta River, in the interior of California," 
Fremont (Gray Herb. and Torrey Herb.), түре; Kanab, coll. 
of 1872, Mrs. A. P. Thompson (Gray Herb. and U. S. Nat. 
Herb.) ; St. George, coll. of 1875, E. Palmer (Gray Herb. and 
Mo. Bot. Gard. Herb.); ‘‘Sierra La Sal Pers," May-Ocet., 
1899, Purpus (U. S. Nat. Herb. No. 505317); near Wilson 
Mesa, Grand Co., alt. 1600 m., 1 July, 1911, Rydberg ё Gar- 
rett 8393 (U. S. Nat. Herb. and Univ. Calif. Herb.). 
Colorado: Naturita, alt. 1645 m., 27 April, 1914, Payson 
258 (Mo. Bot. Gard. Herb.); dry arroyo sides, Paradox, 
Montrose Co., alt. 1645 m., June, 1912, Walker 99 (U. S. Nat. 
Herb. and Mo. Bot. Gard. Herb.) ; in dry fields, Mancos, alt. 
2130 m., 8 July, 1898, Baker, Earle Ф Tracy 446 (Mo. Bot. 
Gard. Herb.), previously included with S. tridenticulatus; 
along Kyser Creek, on the Grand Mesa, Delta Co., Purpus 
222 (Univ. Chieago Herb. at Field Mus. No. 357369) ; Grand 
Junetion, May, 1892, Eastwood (Univ. Calif. Herb. No. 91435). 
Wyoming: sage-brush flats, Henry's Fork, Uinta Co., 26 
June, 1902, Goodding 1194 (Gray Herb., U. S. Nat. Herb., 
and Mo. Bot. Gard. Herb.). 
Nevada: vicinity of Pioche, Lincoln Co., 9 June, 1909, 
Miss Maud Minthorn 44 (Univ. Calif. Herb.). 
Var. Standleyi Greenm. var. nov. 
Stems several, 1.5 to 2 dm. high, slender, leafy at the base, 
nearly naked above; leaves oblanceolate and sparingly den- 
