386 COMPOSITE. Senecio. 



bearing several or numerous loosely cymose slender-pedunculate heads : leaves somewliat 

 succulent, lanceolate, irregularly and sparsely dentate witli salient teetli, attenuate below and 

 with a dilated cordate-clasping base, or the lower tapering into a naked petiole; uppermost 

 small, linear, entire: heads 4 or 5 lines high: rays about 12; disk-flowers 20 or more. — 

 Proc. Am. Acad. xvii. 220. — Santa Catalina ilountains, S. Arizona, Lemmon. 

 -H- -H* Stems herbaceous, numerou.^ly leafy to the top : leaves all rounded-subcordate and angu- 



lately somewliat lobed, palmately veined and retlculate-venulose, petioled: heads small and 



numerous in a compound cj'me. 



S. Hartwegi, Bexth. Flocculent-tomentulose when young, or nearly glabrous : stems 2 or 

 3 feet high from a somewhat tuberous rootstock : leaves cliartaceo-membranaceous (2 to 4 

 inches broad, and petiole inch or two long), the margin with 7 to 9 short angulate lobes or 

 coarse teeth, and sinuses denticulate : veinlets minutely reticulated ; heads 3 or 4 lines long, 

 crowded: involucre narrovv-campanulate, 12-20-flowered; its bracts lanceolate, sliort: rays 

 few. — PI. Hartw. 18, form with leaves tomentulose beneath. S. Sceiiianiii, Schultz Bip. in 

 Seem. Bot. Herald, 311, glabrous form. — Caiions, S. Arizona, near Fort Huachuca, Lemmon, 

 (Mex. ; of a Mexican type unlike any other N. American.) 



-H- -H- -I")- Stems numerously and nearly equably leafy to the top : leaves pinnately veined, not con- 

 spicuously reticulated, from entire to laciniate-dentate, nevei- divided or dissected, nor narrowly 

 linear: glabrous, or ver}- early glabrate and smooth, seldom a vestige of wool at anthesis. 



= Low, alpine: heads subsolitarj', radiate. 

 ^ S. Preni6llti, Tokr. & Gu.ir. Jlany-stemmed from a thickish caudex, a span to a foot 

 high: leaves thickish, from rounded-obovate or sjiatuhite to oblong (iuch or sometimes 

 2 inches long), obtuse, obtusely or acutely dentate, sometimes even pinnatifid-dentate, lower 

 abruptly contracted into a winged petiole ; uppermost sessile by broadish base : heads half- 

 inch high, short-peduncled, subtended by a few short loose bractlets : rays 3 to 5 inches long. 

 — Fl. ii. 445. — Alpine region of the Eocky Mountains (first coll. by Fremont), from near 

 Brit, boundary to S. Colorado, Utah, and Lassen's Peak, California: passing to 



Var. Occidentalis, Geay. More slender, with rounder leaves and heads longer- 

 peduucled ; in high alpine stations becoming very dwarf, and flowering almost from the 

 ground. —Bot. Calif, i. 618. — Sierra Nevada, California, at 10,000 to 12,000 feet, Rothrork, 

 &c. Also Rocky Mountains of N. Wyoming and Montana, at 7,000 to 8,000 feet, Lijall, 

 Parrij, very dwarf. 



= = Rather low, with numerous C3'mosely paniculate and small heads, always rayless. 

 S. rapifolius, Nctt. About a foot high : leaves ovate or oblong, throughout very sharply 

 and unequally dentate, rather fleshy ; radical tapering into a petiole, cauline mostly clasping 

 by a broad subcordate base : heads 3 lines high, about 15-flowered : involuo-al bracts 8 to 10, 

 narrowly oblong. — Trans. Am. Phil. Soc. vii. 409: Torr. & Gray, Fl. ii. 441. — Bocky 

 Mountains, Wyoming, about the sources of the Platte, Nuttali, Fremont, &c. 



= = ^ Tall, with corymbosely CA'niose and radiate heads : involucre setaceously fcw-bracteo- 

 late, campanulate or narrower: leaves nearly membranaceous. 



S. triangularis, Hook. Rather stout : stem simple, 2 to 5 feet high, bcariuQ- several or 

 somewhat numerous heads iu a corymbiform open cyme : leaves all more or less petioled and 

 thickly dentate (sometimes minutely so, sometimes with long lanceolate-subulate and very 

 salient teeth), deltoid-lanceolate, or the lower triangular-hastate or deltoid-cordate, and upper- 

 most lanceolate with cuneate base : heads about half-inch high : involucre campanulate, 

 mostly 25-30-flowered ; the oblong-linear rays 6 to 12. — Fl. i. 332, t. 115; Torr. & Gnxy, Fl. 

 ii. 441 ; Eaton, Bot. King Exp. 189 ; Gray, Bot. Calif, i. 414. 5. lomjidentatiis, DC. Prodr. 

 vi. 428. — Wooded districts in wet ground, Saskatchewan to Washington Terr., south to the 

 higher mountains of Colorado and through the Sierra Nevada, California. 



S. Huachucanus, Gray. Two or three feet high, scunewhat branching: loaves ovate- to 

 oblong-lanceolate, acuminate, minutely denticulate; lower cauline (4 to 6 h>chcs long) tn]icr- 

 ing into a winged petiole, upper partly clasping by a broad subcordate base; hcails fastigi- 

 ately cymose, small, aliout 4 lines high : involucre cylindriiccims-canipanulalc, 15-lS-flowered: 

 the small rays 3 or 4. — Proc. Am. Acad. xix. 54. — High bluffs near Fort Huachuca, S. 

 Arizona, Leiiiinini. 



S. s6rra, Hooic. Strict, 2 to 4 feet high, very leafy, sometimes simple and bearing rather 

 few somewhat large (half-inch long) heads, commonly branching at summit, then bearing 



