[Vol. 2 



594 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Richards. ; Nelson, in Coulter & Nelson, Manual Cent. Rocky 

 Mountains, 583. 1909, in part, not Richards. 



S. MacDougalii Greenm. Monogr. Senecio, I. Teil, 23. 1901, 

 and in Engl. Bot. Jahrh. 32 : 19. 1902, in part, not Heller ; 

 Rydb. Fl. Colo. 397. 1906, in part, not Heller. 



Herbaceous perennial, glabrous or essentially so through- 

 out; stems one to several from a ligneous base, 3 to 5 dm. 

 high; leaves oblanceolate to ovate-lanceolate in general out- 

 line, 3 to 13 cm. long, 1 to 5 cm. wide, more or less laciniately 

 pinnatifid into linear to lanceolate, entire to coarsely and un- 

 equally dentate divisions ; inflorescence a terminal corymbose 

 cyme ; heads usually numerous, 7 to 10 mm. high, radiate ; in- 

 volucre subcampanulate, 5 to 7 mm. in diameter, calyculate; 

 bracts of the involucre usually 13, linear-lanceolate, 5 to 7 mm. 

 long, commonly black-tipped ; ray-flowers 5 to 8 ; disk-flowers 

 30 to 45; achenes hirtellous-puberulent. 

 Distribution: Wyoming to New Mexico, Idaho, and Arizona. 

 Specimens examined: 



Wyoming: gravelly banks, Centennial Mountain, Albany 



Co., 2 Aug., 1902, Nelson 8773 (Gray Herb., Field Mus. Herb., 



and Mo. Bot. Gard. Herb.) ; moist ground in open woods, 



Centennial, 27 July, 1900, Nelson 7717 (Gray Herb, and Mo. 



Bot. Gard. Herb.) ; Bridger Peak, Carbon Co., 22 Aug., 1903, 



Goodding 1942 (U. S. Nat. Herb, and Mo. Bot. Gard. Herb.). 



Colorado: Chamber's Lake, alt. 2895 m., 13 Sept., 1896, 



Baker (Mo. Bot. Gard. Herb.); canon west of Palmer Lake, 



alt. 2435 m., 12 Aug., 1896, Crandall (Mo. Bot. Gard. Herb.) ; 



Steamboat Springs, 20 July, 1903, Goodding 1617 (U. S. Nat. 



Herb, and Mo. Bot. Gard. Herb.) ; Boulder, coll. of 1908, Pace 



(Mo. Bot. Gard. Herb.); Denver, 8 Sept., 1905, Moffat (Mo. 



Bot. Gard. Herb.); Georgetown, 19 Aug., 1895, Shear 4720 



(U. S. Nat. Herb.), coll. of 19 July, 1886, Trelease, and coll. 



of 26 July, 1886, Letterman (Mo. Bot. Gard. Herb.) ; Rocky 



Mountains, Powell's Colorado Exploring Expedition 1868, 



Vasey 337 (Gray Herb.) ; Golden City, 18 Aug., 1870, Greene 



230 (Gray Herb.) ; Silver Plume, 21 Aug., 1895, Shear 4999 



(U. S. Nat. Herb.) ; Manitou, Aug., 1881, Fritchey 14, in part, 



and coll. of 16 Aug., 1884, Letterman (Mo. Bot. Gard. Herb.) ; 



