384 COMPOSITE. Senecio. 



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

 stem stout, 6 to 30 inches high, equal)ly very leafy to top, bearing solitary or several 

 corvmbosely 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 aurio- 

 ulate base : involucre calyculate Ijy few or several slender-subulate 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. 446. Arnica maritiina, L. Spec, 

 ii. 884 ; Pursh, Fl. ii. 528. A. Doronicum, Pursh, 1. c. — Sea-beaches, &c., Newfoundland, 

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

 (N. Asia.) 



^_ ^_ Disk-corollas merely 5-toothed. Rocky-Mountain and more Western species. 



•H- Heads radiate. 



= Alpine species of the Rocky Mountains. 



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, Parrij, Hall & Harbour, Coulter, &c. 



S. amplectens, Gray. 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 tliinner 

 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 Parrij. 

 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 rays 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 Parrij. The most dwarf forms are very 

 unlike the type. 



= = Not alpine: scapiform 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 rosuLite 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 Flag.staff, Rushi/. 



^ ^ == Not alpine, with leaf}' 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 higli, naked above, with an ample loose 

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

 irregular ; 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. eurijcvphahis, var. 

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

 Calaveras Co., California, Birjelow. 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 l)elow, naked above, bearing a corymbiforni 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 obh ng-lanceolate, taper- 

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



