1917] 
GREENMAN—MONOGRAPH OF SENECIO 25 
S. Nelsonii var. utahensis Nelson, Contr. Fl. Rocky Moun- 
tains, in index. 1904. 
S. utahensis Nelson, Spring Fl. Intermountain States, 175. 
1912. 
An herbaceous perennial; stems one to several from a com- 
mon base, erect or nearly so, 1 to 3.5 dm. high, glabrous or 
slightly tomentulose, striate, stramineous to somewhat pur- 
plish; radieal and lower stem-leaves obovate to oblong- 
oblanceolate in general outline, mostly lyrately pinnatifid, 
lightly floecose-tomentulose to glabrous, thickish in texture, 
including the petiole 2.5 to 10 em. long, .5 to 2.5 em. broad; 
upper stem-leaves sessile, pinnatifid, often much reduced; in- 
florescence a terminal usually many-headed corymbose cyme; 
heads 8 to 10 mm. high, radiate; involucre campanulate, spar- 
ingly calyculate; bracts of the involucre usually 21 (occasion- 
ally two or more bracts more or less coalescent), linear-lanceo- 
late, 5 to 6 mm. long, glabrous; ray-flowers about 8, rays yel- 
low; disk-flowers 30 to 50; achenes glabrous or rarely slightly 
hirtellous. 
Distribution: Wyoming to Arizona, west to Oregon and 
eastern California. 
Specimens examined: 
Wyoming: Evanston, 4 June, 1898, A. Nelson 4511 (Gray 
Herb., U. S. Nat. Herb., and Mo. Bot. Gard. Herb.), со-түрЕ; 
Evanston, 10 July, 1897, Williams (U. S. Nat. Herb.) ; open 
slopes, Kemmerer, Uinta Co., 13 June, 1900, Nelson 7172 
(Gray Herb., U. S. Nat. Herb., and Mo. Bot. Gard. Herb.) ; 
La Barge, Uinta Co., 7 June, 1894, Stevenson 208 (U. S. Nat. 
Herb.); Uinta Mountains, Aug. 1872, Dr. Joseph Leidy 
(Phil. Acad. Nat. Sci. Herb.) ; dry soil, сайоп near Leckie, 23 
June, 1901, Merrill € Wilcox 716 (U. S. Nat. Herb.). 
Idaho: Soda Springs, 21 June, 1892, Mulford (Gray Herb. 
and Mo. Bot. Gard. Herb.) ; near Pocatello, 27 May, 1893, Dr. 
E. Palmer 57? (U. S. Nat. Herb.) ; moist grassy bottom of Port 
Neuf River, near Pocatello, 23 July, 1897, Henderson 2998 
(Gray Herb.) ; Pocatello, 27 June, 1902, Blankinship (Gray 
Herb.); on dry slopes, Pocatello, 28 July, 1911, Nelson & 
