Senecio. COMPOSITE. 385 



subulate bracts : involncral bracts linear-subulate, and with several loose and slender cal3'cu- 

 late ones: rays oblong, seldom half-inch in length. — Proc. Am. Acad. vii. 3G2, & Bot. Cahf. 

 1. c. 413. — Plains, Mendocino to Humboldt Co., California, Bolunder, Kellogg, Harford. 



S. Greenei, Gray. Lightly floccose-tomentose, seldom a foot high, simple, hearing 1 to 3 

 short-ped uncled heads: leaves (about inch long) coarsely dentate; radical roundish, with 

 abrupt or somewhat cuneate base, coarsely crenate-dentate, slender-petioled ; cauliue few, 

 sessile, upper lanceolate and entire, sometimes all small aud bract-like : heads two-thirds inch 

 long : bracts of involucre linear, no outer calyculate ones : rays deep orange, half-inch or 

 more long : style-tips of disk-tlowers conspicuously jjeuicillate-margined and with a central 

 cusp. — Proc. Am. Acad. x. 75, & Bot. Calif, i. 412. — Wooded mouutain-side, near the 

 Geysers in Lake. Co., California, Greene. 



S. megaceplialus, Nutt. About a foot iiigh, loosely floccose- woolly, tardily glabrate, 

 leafy : leaves entire, lanceolate, or the radical spatulate-lauceolate and tapering into a petiole, 

 and uppermost cauline attenuate, tliickish (ol)scurely glandular under the wool?): heads 

 1 to 3, sliort-peduncled (8 lines to an inch high) ; involucre calyculate by some very loose and 

 setaceous-subulate elongated accessory bracts ; sometimes the true bracts and peduncles bear 

 a few hirsute hairs besides the loose wool : rays over half-inch long. — Trans. Am. Phil. Soc. 

 1. c. 410; Torr. & Gray, Fl. ii. 438. — Mountains of Idaho, Nnttall, Watson, and Rocky 

 Mountains, at 5,000 to 8,000 feet, near British Boundary, Lyall, Canhtj. 



++ -K- Heads rayle.ss, nodding: some .sparse crisped hairs in place of tonientum: caiidex hardly 

 any ; the root a cluster of fibres. 



S. Bigelovii, Gray. Robust, 2 or 3 feet high, leafy up to near the racemiform or simply 

 paniculate inflorescence, pubescent with some sparse crisped hairs when young, and with 

 mere traces of arachnoid caducous wool, at length glabrate : leaves from elongated-oblong 

 to lanceolate, denticulate or more dentate, acute or acuminate; radical and lower cauline 

 3 to 6 inches long, abrupt at base and uaked-petioled, or tapering into a winged petiole or 

 partly clasping base; upper lanceolate with partly clasping base : heads in small plants few 

 or solitary, in larger ones several, nodding on their peduncles : involucre very broadly cam- 

 panulate ; its bracts lanceolate, thickish ; a few small aud loose subulate accessory bractlets 

 at base. — Pacif. R. Rep. iv. Ill ; Porter & Coulter, Fl. Colorad. 83 ; Rothrock in Wheeler 

 Rep. 178. With var. ihtUii, Gray, Proc. Acad. Philad. 1. c. (more sessile-leaved), and var. 

 monocephalus, Rothrock, 1. c. (smallest form). — Mountains of Colorado, New Mexico, and 

 Arizona, at 8,000 to 10,000 feet; first coll. by Bigeloiv. 



* * Heads middle-sized or small (half-inch or less). 



H— Nodding on tlie paniculate pedicels in anthcsis, rayless, a few loose setaceous or subulate bract- 

 lets at their l)ase : very early glabrate or quite glabrous leafy-stemmed plants: leaves at most 

 dentate, all either petioled or attenuate at base. 



S. Rlisbyi, Greene. Stem 2 to 4 feet high : leaves very obscurely pruinose-pubcrulent 

 under a lens, ovate-lanceolate, callous-denticulate ; the lower (3 to G inches long) with abrupt 

 or truncate base and winged petiole with dilated and somewhat auriculate half-clas])ing in- 

 sertion ; uj)per cuueately contracted into the winged petiole ; the small uppermost closely 

 sessile, attenuate-acuminate : heads (4 or 5 lines high) less nodding than in the next, almost 

 hemispherical. — Bull. Torr. Club, ix. 64, at least as to pi. Rusby. — New Mexico, in the 

 Mogollon Mountains, Rusby. Apparently in Santa Catalina Mountains, Arizoiux, Lennnon, 

 but specimens insufficient. Nearly related to the following : root nearly of the preceding. 



S- cernuus, Gray. Quite glabrous, usually more slender, 2 or 3 feet high : leaves lanceolate 

 or the larger oblong-lauceolate, entire, denticulate, rarely with a few scattered coarser teeth, 

 all tapering at base into a barely margined petiole, or upper into a narrowed uot clasping 

 base : heads (4 to almost 6 lines long) several or numerous in the panicle, most of them de- 

 cidedly nodding: involucre narrow-campanulate : flowers pale yellow. — Am. Joux. Sci. 

 ser. 2, xxxiii. 10; Porter & Coulter, Fl. Colorad. 82. — Mountains of Colorado, wholly below 

 the alpine region ; first coll. by Parri/. 



+— +— Heads erect, mostly radiate, occasioiuilly rayless in same species. 

 ++ Stem fnitescent below. 



S. Lemmoni, Gray. Loosely much branched, early glabrate and smooth : main stems de- 

 cidedly woody : branches slender, spreading, very leafy below, nearly naked at summit, 



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