386 COMPOSITE. Senecio. 



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

 succulent, lanceolate, irregularly and sparsely dentate with salient teeth, attenuate below and 

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

 smaU, linear, entire: heads 4 or 5 lines liigh : rays about 12; disk-tiowers 20 or more. — 

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



■H- ++ Stems herbaceous, numerously leafy to tlie top : leaves all rounded-subcordate and angu- 

 lately somewhat lobed, palmately veined and reticulate-venulose, petioled: heads small and 

 numerous in a compound cyme. 



S. Hart"Wegi, Bexth. Flocculent-tomentulose when young, or nearly glabrous : stems 2 or 

 3 feet high from a somewhat tuberous rootstock : leaves chartacco-membrauaceous (2 to 4 

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

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

 crowded: involucre narrow-campauulate, 12-20-tiowered; its bracts lanceolate, sliort: rays 

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

 Seem. Bot. Herald, 311, glabrous form. — Canons, S. Arizona, near Fort Iluachuca, Lemmon. 

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



++ ++ +-I- Stems numerously and nearly equabh' leafy to the top: leaves pinnately veined, not con- 

 spicuously reticulated, from entire to laciniate-dentate, never divided or dissected, nor narrowly 

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

 = Low, alpine : lieads subsolitary, radiate. 

 S. Prein6nti, Torr. & Gray. ]\Iany-stemmed from a thickisli caudex, a span to a foot 

 liigh : leaves thickish, from rounded-obovate or sjiatnlate to oblong (iuch or sometimes 

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

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

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

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

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



Var. occidentalis, Gray. More slender, with rounder leaves and heads longer- 

 peduncled ; in high aljiine stations becoming very dwarf, and flowering almost from the 

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

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

 Parri/, very dwarf. 



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

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

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

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

 narrowly oblong. — Trans. Am. Phil. Soc. vii. 409: Torr. & Gray, Fl. ii. 44L — Rocky 

 Mouutaius, Wyoming, about the sources of the Platte, Nuttall, Fremont, &c. 



= = = Tall, with corvmbosely cymose and radiate heads: involucre setaceously few-bracteo- 

 late, campanulate or narrower: leaves nearly membranaceous. 



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

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

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

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

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

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

 ii. 441 ; Eaton, Bot. King Exp. 189 ; Gray, Bot. Calif, i. 414. S. Jonrjidentatus, 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, somewhat branching: leaves ovate- to 

 oblong-lanceolate, acuminate, minutely denticulate; lower cauline (4 to 6 inches long) taper- 

 ing into a winged petiole, upper jiartly clasping by a broad subcordate base : heads fastigi- 

 ately cymose, small, about 4 lines high : involucre cylindraceouscampanulate, 15-18-flowered : 

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

 Arizona, Lenumm. 



S. serra, Hook. 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 



