190 BOTANY. 



crenately-serrate radical leaves, and the cauline ones lyrate or lanceolate, pin- 

 nately toothed and cleft. British America, and the Northern United States 

 to Nevada and California. East Humboldt Mountains ; 6,500-9,000 feet ele- 

 vation; August. (667.) 



Var. OBOVATUS, T. & G. Eadical leaves roundish-obovate or broadly 

 spatulate, toothed or serrated. — Throughout British America and the United 

 States to Virginia, and westward to Nevada. Smooth forms ; plant rather 

 low. Pah-Ute range, Euby Valley, and East Humboldt Mountains, Nevada ; 

 5-9,000 feet elevation. (668.) Also a lanuginous form, mostly taller, 15-20' 

 high. Wahsatch Mountains ; 8,000 feet elevation ; June-August. (669.) 



Var. BOREALis, T. & G. Smooth ; radical leaves thickish, obovate or 

 spatulate, entire or crenulate-toothed at the apex only. — Arctic America, and 

 along the Rocky Mountains to New Mexico. Ruby and Goose Creek Valleys, 

 Nevada; 6-6,500 feet elevation ; July-September. (670.) 



Var. CEOCEUS, Gray. Proc. Acad. Phil., March, 1863, p. 68. Smooth ; 

 radical leaves roundish-oval, more or less crenately toothed, cauline ample ; 

 corymb rather compact ; rays saffron-yellow. — Mountains of Colorado. City 

 Creek Caflon, "Wahsatch, and Bear River Canon, Uintas ; 6-8,000 feet eleva- 

 tion; May-August. (671.) 



Senecio canus, .Hook. Whitish-tomentose throughout; stems tufted, 

 2-12' high; radical leaves obovate, obtuse, narrowed into short petioles; the 

 cauline sessile, lanceolate, pinnately cleft, or with a few teeth near the base, 

 rarely entire ; heads rather large, few in a simple corymb ; involucre nearly 

 ecalyculate ; rays 8-12, not twice as long as the involucre ; achenia glabrous. — 

 Saskatchewan to Oregon and California, the Upper Missouri and Colorado. 

 Peaks of East Humboldt Mountains, and of the Uintas ; 9-12,500 feet 

 altitude; July, August. Dwarf alpine forms, 2-4' high, like Brewer's 

 1905. (672.) 



Var. EEADIATUS. Rays none; radical leaves few-toothed at the apex, 

 cauline nearly entire.— Plant 4' high. Top of a high peak in the East Hum- 

 boldt Mountains ; 10,000 feet elevation ; August. (673.) 



Senecio Fendleri, Gray. PL Fendl. 108. Perennial, webby-canescent, 

 at length nearly smooth ; stems a foot high or less, solitary or few from a 

 single tap-root, leafy, corymbose at the summit ; leaves obovate-oblong, deeply 

 lyrate-pinnatifid, the lower and radical ones narrowed into a short wingless 

 petiole; upper ones sessile; segments cuneate-oblong, numerous, incisely 



