384 COMPOSITiE. Senecio. 



S. Pseudo- Arnica, Less. Floccosely white-tomentose, more or less glabrate in age : 

 stem stout, 6 to 30 inches high, equably very leafy to top, bearing solitary or several 

 corymbosely disposed heads on stout bracteolate peduncles : leaves obloug-lingulate or the 

 lower spatulate, denticulate or dentate, 5 to 8 inches long, sessile by a partly clasping auric- 

 ulate base : involucre calyculate by few or several slender-sul)ulate loose accessory bracts : 

 rays numerous, half-inch or more long : pappus dull white. — Less, in Linn. vi. 240; Hook. 

 Fl. i. 334, t. 113 ; DC. Prodr. vi. 358 ; Torr. & Gray, Fl. ii. 44G. Arnica jnaritima, L. Spec. 

 ii. 884; Pursh, Fl. ii. 528. A. Doronkum, Pursli, I.e. — Sea-beaches, &c., Newfoundland, 

 New Brunswick, and border of Maine to Labrador, and west to the Aleutian Islands. 

 (N. Asia.) 



■i— H— Disk-corullas merely 5-toothed. liocky-Mountahi and more Western species. 



++ Heads radiate. 



= Alpine species of the Rocky Mountain:*. 



S. Soldanella, Gray. Apparently glabrous from the first, a span high, somewhat succu- 

 lent : leaves mostly radical and long-petioled, from round-reniform to spatulate-obovate, 

 denticulate or entire ; cauline one or two or none : head solitary, erect, two thirds to nearly 

 a full inch high : involucral bracts lanceolate and a very few calyculate ones : rays 6 to 10, 

 oblong, quarter-inch long. — Proc. Acad. Philad. 1863, 67; Porter & Coulter, Fl. Colorad. 

 83. — High alpine region, mountains of Colorado, Pamj, Hall & Harbour, Coulter, &c. 



S. amplectens, Grav. Lightly floccose-woolly at first, soon glabrate, a foot or so high, 

 few-several-leaved, terminated by one or two long-pedunculate nodding heads : leaves tliinnor 

 than in the foregoing, from denticulate to conspicuously and sharply dentate ; radical ob- 

 ovate to spatulate, tapering into a winged petiole; cauline as large or larger (4 to 6 inches 

 long), oblong or narrower, half-clasping or more, the upper by a broad base : involucre over 

 half-inch high, of linear bracts and a few loose calyculate ones : rays linear, inch long or 

 more, acute or acutely 2-3-toothed at tip. — Am. Jour. Sci. ser. 2, xxxiii. 240, & Proc. Acad. 

 Philad. 1. c. — Alpine and subalpine region, Rocky Mountains, Colorado ; first coll. by Parri/. 

 Var. taraxacoides, Gray. Only a span or two high, with fewer and smaller cauline 

 leaves ; these and the radical commonly spatulate and with tapering base, not rarely lacini- 

 ately subpinnatifid : head smaller, even down to half-inch, and with raj-s of only the same 

 length. — Proc. Acad. Philad. 1863, 67 ; Eaton, Bot. King Exp. 192. —High alpine, in the 

 mountains of Colorado and Nevada ; first coll. by Parry. The most dwarf forms are very 

 unlike the type. 



= = Not alpine: scapifonn stem low, strict and strictly monocephalous. 



S. Actinella, Greene. Floccosely white-tomentose, glabrate in age : simple stem 6 to 10 

 inches high, bearing several small and appressed linear bract-like leaves and an erect head of 

 two thirds of an inch in height: radical leaves in a rosulate tuft, obovate-spatulate, denticu- 

 late, subcoriaceous, an inch or more long including the cuneate narrowed base or short 

 winged petiole: involucral bracts subulate-linear : rays 9 to 12, rather conspicuous, broadly 

 linear. — Bull. Torr. Club, x. 87. — N. Arizona, near Flagstaff, Rushy. 



= ^ == Not alpine, with leafy stems a foot to a yard high, and several or few or sometimes 

 solitary erect heads. (Here S. Clarkianus, if the heads were a little larger.) 



S. "Whippleanus, Gray. Probably floccose when young, sprinkled with less deciduous 

 araneose hairs : stem robust, apparently 3 or 4 feet high, naked above, with an ample loose 

 cyme : leaves ample (6 or 8 inches long), sinuately or laciniately pinnatifid, the lobes few and 

 irregixlar ; cauline sessile : peduncles mostly elongated, naked : involucral bracts fleshy- 

 thickened, oblong-linear, abruptly acuminate ; a very few loose and small slender calyculate 

 bracts: rays half-inch long. — Proc. Am. Acad. xix. 54, without char. S. eurycephahts, var. 

 major. Gray, Pacif. R. Rep. (Bot. Whipp.) iv. 111. — Lower Sierra Nevada, at Murphy's, 

 Calaveras Co., California, BIgelow. Further specimens needed. The broad heads nearly 

 three-fourths inch high. 



S. Mendocinensis, Gray. Lightly arachnoid-floccose, soon glabrate : stem robust, 2 or 3 

 feet high, leafy below, naked above, bearing a corymbiform cyme of several heads on 

 sparsely setaceous-bracteolate peduncles : leaves somewhat succulent, irregularly repand- 

 denticulate to dentate ; radical and lower 3 to 6 inches long, oval to oblong-lanceolate, taper- 

 ing into margined petioles; upper lanceolate from a broad sessile base, above reduced to 



