384 COMPOSITE. 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 oblong-liugulate 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-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. 44G. Arnica waritima, L. Spec. 

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

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

 (N. Asia.) 



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



++ 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-remform 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, Parry, 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 thinner 

 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 Parry. 

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

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

 ately subpinuatifid : 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 Parry. 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 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 : ravs 9 to 12, rather conspicuous, broadly 

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



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

 solitary erect heads. (Here S. Clarkinnus, 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 laciuiately 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 calvculate 

 bracts : rays half-inch long. Proc. Am. Acad. xix. 54, without char. S. eurycep/iitlus, var. 

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

 Culaveras Co., California, B'ujelow. Further specimens needed. The broad heads nearly 

 three-fourths inch high. 



S. Mendocinensis, GRAY. Lightly arachuoid-floccose, soon glabrate : stem robust, 2 or 3 

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

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

 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 



