[Vor. 5 
84 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Jahrb. 32 : 20. 1902; Piper, Contr. U. S. Nat. Herb. 11: 599. 
1906; Piper & Beattie, Fl. S. E. Wash. & Adjacent Idaho, 274. 
1914. 
S. canus Torr. Bot. Wilkes’ U. S. Expl. Exp. 367. 1874, in 
part, not Hook.; Gray, Syn. Fl. N. Am. 12: 390. 1884, and ed. 
2, 1886, in part, not Hook.; Holzinger, Contr. U. S. Nat. Herb. 
3 : 235. 1895, not Hook. 
S. Purshianus Howell, Fl. N. W. Am. 1: 378. 1900, not Nutt. 
An herbaceous cespitose perennial, at first white-tomentose, 
later more or less glabrate; stems 1 to 3 dm. high, erect, sim- 
ple or branched, rather freely stoloniferous at the base; basal 
and lower stem-leaves elliptic-lanceolate to narrowly oblance- 
olate, including the petiole 2 to 12 em. long, .5 to 1.5 em. broad, 
obtuse or acute at the apex, entire to subpinnately and irregu- 
larly lobed, narrowed below into a slender petiole equalling or 
exceeding the blade, at first white-tomentose on both surfaces, 
later more or less glabrate especially on the upper surface, 
margins often revolute; upper stem-leaves usually much re- 
duced, lanceolate to lance-linear, sessile, entire to dentate- 
lobed, not infrequently subauriculate at the base; inflorescence 
a terminal few to several-headed corymbose cyme; heads 8 to 
10 mm. high, radiate; involuere campanulate, sparingly ealye- 
ulate; braets of the involuere usually about 13, linear-lance- 
olate, 5 to 7 mm. long, glabrous or nearly so; ray-flowers about 
8, rays yellow ; disk-flowers 30 to 40; achenes glabrous. 
Distribution: Idaho and Washington, south to Utah and 
northern California. 
Specimens examined: 
Idaho: valley of Spokane River, Kootenai Co., 18 July, 1892, 
Sandberg, MacDougal & Heller 668 (U. S. Nat. Herb.) ; Big 
Butte Station, 21 June, 1893, E. Palmer 206 (U. S. Nat. 
Herb.) ; about Lake Waha, Nez Perces Co., alt. 610-1065 m., 29 
June, 1896, A. А. ё Е. С. Heller 3340 (U. S. Nat. Herb. and 
Mo. Bot. Gard. Herb.), form with both radiate and discoid 
heads; dry hillsides, Three Creek, Owyhee Co., 1 July, 1912, 
Nelson & Macbride 1863 (U. S. Nat. Herb. and Mo. Bot. Gard. 
Herb.); dry soil, Fernan Flats, Coeur d'Alene, July, 1912, 
H. J. Rust 112 (U. S. Nat. Herb.) ; old lava plain, Martin, 
