[Vor. 5 
58 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Syn. Fl. N. Am. 12: 389. 1884, and ed. 2, 1886, mainly ; Coulter, 
Manual Rocky Mountain Region, 210. 1885, mainly; Clements 
& Clements, Rocky Mountain Flowers, 293. 1914. 
S. petrophilus Greene, Pittonia 3 : 171. 1897, not Klatt. 
S. petrocallis Greene, Pittonia 4 : 116. 1900; Rydb. ЕІ. Colo. 
397. 1906. | 
S. alpicola Rydb. Mem. N. Y. Bot. Gard. 1 : 447. 1900. 
S. pentodontus Greene, Pl. Baker. 3 : 26. 1901. 
(7) S. turbinatus Rydb. Bull. Torr. Bot. Club 33 : 159. 1906. 
S. aureus var. alpinus Gray, Am. Jour. Sci. ПІ. 33 : 240. 
1862; Proc. Acad. Nat. Sci. Phil. p. 68. 1863; Porter & Coulter, 
КІ. Colo. 81. 1874. 
A low herbaceous perennial, white-tomentulose in the early 
stages, more or less glabrate; stems solitary or cespitose from 
a multicipital caudex, .5 to 1.5 dm. high; leaves chiefly basal, 
rotund-obovate to spatulate, including the petiole 1.5 to 10 em. 
long, .5 to 2 em. broad, entire or crenate-dentate towards the 
apex; upper stem-leaves few, much reduced, bracteiform; in- 
florescence a terminal few to several-headed corymbose суше; 
heads 10 to 12 mm. high, radiate; involucre campanulate, spar- 
ingly calyculate ; bracts of the involucre (13-)21, linear-lanceo- 
late, acute, 7 to 10 mm. long; ray-flowers 10 to 12, rays yellow; 
disk-flowers numerous, 35 to 75; achenes glabrous. 
Distribution: Rocky Mountains at high altitudes, Montana 
and Idaho, south to Colorado. | 
Specimens examined: 
Montana: Black Butte, Tobaeco Root Range, alt. 3200 m., 
11 Aug., 1902, Blankinship (Gray Herb.); Cedar Mountain, 
alt. 3150 m., 16 July, 1897, Rydberg Ф Bessey 5269 (U.S. Nat. 
Herb.). 
Idaho: Slide Rock, Mackay (Bear Cañon), Custer Co., ай. 
3150 m., 31 July, 1911, Nelson & Macbride 1509 (Mo. Bot. 
Gard. Herb.) ; Saw-tooth Peak, near Pettit Lake, 27 July, 1895, 
Henderson 3528 (U. S. Nat. Herb.) ; summit of Soldier Moun- 
tains, alt. 3350 m., 15 July, 1895, Henderson 3230 (U. S. Nat. 
Herb.) ; alpine summits on exposed rock slides, Parker Moun- 
tain, Custer Co., alt. 2740 m., 17 July, 1916, Macbride % Pay- 
son 3262 (Mo. Bot. Gard. Herb.). 
