[Vor. 3 
106 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
2.5 to 8 em. long; upper stem-leaves sublaciniate and some- 
what ampliated at the base and partly clasping the stem; 
heads about 12 mm. high, including the rays 3 to 3.5 em. in 
diameter; involucre campanulate, essentially ecalyculate; 
bracts of the involucre lanceolate-linear, 8 to 10 mm. long, 
acute, glabrous; ray-flowers 10 to 12, rays light yellow, con- 
spicuous; disk-flowers numerous; achenes glabrous. 
Distribution: west central Mexico. 
Specimen examined: 
Territory of Tepic: Sierra Madre, near Santa Teresa, 10 
Aug., 1897, Rose 2157 (Gray Herb. and U. 8. Nat. Herb.), 
TYPE. 
46. S. Porteri Greene, Pittonia 3:186. 1897; Greenm. 
Monogr. Senecio, I. Teil, 24. 1901, and in Engl. Bot. Jahrb. 
32:20. 1902; Rydb. КІ. Colo. 397. 1906. 
S. renifolius Porter in Porter & Coulter, Syn. Fl. Colo. 
83. 1874, not Schz. Bip.; Gray, Syn. Fl. N. Am. 1:389. 1884, 
and ed. 2, 1886; Coulter, Manual Rocky Mountain Region 210. 
1885. | 
A low herbaceous perennial, glabrous throughout and more 
or less tinged with purple; stems ascending from a slender 
rootstock, 1 dm. or less high; leaves petiolate, mostly reniform, 
including the petiole 1.5 to 5 em. long, .8 to 2.5 cm. broad, 
erenate; heads about 14 mm. high, solitary on nearly naked 
peduncles, radiate; involucre campanulate, sparingly ealycu- 
late; bracts of the involucre about 13, linear-lanceolate, acute, 
10 mm. long, purplish; ray-flowers 8 to 10, rays bright yellow; 
disk-flowers numerous; achenes glabrous. 
Distribution: high mountains of Colorado and eastern 
Oregon. 
Specimens examined: 
Colorado: White House Mountain, alt. 3960 m., Hayden’s 
U. S. Geol. Survey, 9 Aug., 1873, Coulter 2950 (Gray Herb., 
Phil. Acad. Nat. Sci. Herb., Field Mus. Herb., and Mo. Bot. 
Gard. Herb.). 
Oregon: alpine ridges of the Wallowa Mountains, 3 Aug., 
1899, Cusick 2308 (Gray Herb., Kew Herb., Field Mus. Herb., 
and Mo. Bot. Gard. Herb.). 
