1915] 



QREENMAN MONOGRAPH OF SENECIO 597 



ously flowered heads and usually, but not always, less pin- 

 natisect leaves. 



10. S. eremophilus Richards, in App. Frankl. 1st Journ. 31. 

 1823; Hook. Fl. Bor. Am. 1 : 334. 1840; Torr. & Gray, Fl. N. 

 Am. 2 : 444. 1843; Eaton, Bot. King Exp. 191. 1871, in part; 

 Gray, Syn. Fl. N. Am. I 2 : 392. 1884, and ed. 2, 1886 ; Greenm. 

 Monogr. Senecio, I. Teil, 23. 1901, and in Engl. Bot. Jahrb. 

 32 : 19. 1902 ; Nelson in Coulter & Nelson, Manual Cent. Rocky 

 Mountains 583. 1909, in part. 



S. pembrinensis Greenm. Monogr. Senecio, I. Teil, 23. 

 1901, and in Engl. Bot. Jahrb. 32 : 19. 1902. 



I 



An herbaceous perennial, glabrous or slightly puberulent 

 in the inflorescence ; stems erect, 3 to 8 dm. high, striate ; leaves 

 more or less laciniately pinnatifid with linear, lanceolate or 

 oblong, entire or coarsely and unequally dentate divisions ; the 

 lower leaves petiolate, the upper subsessile; inflorescence 

 terminating the stem in a somewhat leafy corymbose or pan- 

 iculate cyme ; heads rather large, 10 to 12 mm. high, radiate ; 

 involucre campanulate conspicuously calyculate ; bracts of the 

 involucre usually 13, linear-lanceolate, acute, 7 to 9 mm. long, 

 glabrous, minutely brownish- or black-tipped; ray-flowers 

 8 to 10; disk-flowers 40 to 60; achenes ribbed, glabrous, or 

 slightly hirtellous-puberulent. 



Distribution: northwestern Canada to Nebraska, Colorado, 

 and Utah. 



Specimens examined: 



Saskatchewan: Lipton, 11 Aug., 1911, Clohey 1844 (Mo. 

 Bot. Gard. Herb.) ; Qu'Appelle River, Assiniboia, Aug., 1883, 

 Macoun 14839 (Geol. Surv. Canada Herb, and U. S. Nat. 

 Herb.); near Prince Albert, 10 July, 1896, Macoun 12171 

 (Geol. Surv. Canada Herb.) ; in damp thickets north of Sas- 

 katchewan River, 22 Aug., 1872, Macoun 14841 (Geol. Snrv. 

 Canada Herb.) ; Saskatchewan Plains, Macoun 868 (Kew 



Herb 



° >> 



Alberta: "on gravelly banks of Cedar Lake, Lat. 54 

 Richardson (Kew Herb.), type; Pembina, coll. of 1873, Coue 

 (Gray Herb.) ; on damp banks, Bow River at Morley, 6 Sept 



