80 SYNOPSIS OF THE FLORA OF COLORADO. 



stems simple or branched above, 1-1J high, bearing 3 or more heads, 

 leafy to the summit; leaves oblong-lanceolate, acute or obtuse, entire 

 or sparingly denticulate, 3-5-nerved, radical and lower cauline ones 

 narrowed into short petioles, the rest (2-6 pairs) sessile ; rays short; 

 involucre finely villous-pubescent; acheuia minutely hirsute. Hall cl- 

 Harbour, 337. South Park. 



ARNICA MOLLIS, Hook. Readily distinguished by its almost plumose 

 pappus. "Alpine and sub-alpine." Hall & Harbour, 335; Dr. Smith. 

 Sierra Madre Range, at 11,000 feet altitude, Coulter. 



ARNICA LATIFOLIA, Bong. Sparingly hirsute-pubescent or nearly 

 glabrous; stems 1 high, from a slender, creeping caudex; leaves thin 

 and flaccid, ovate or oblong-ovate, acute, unequally and often very 

 sharply serrate, veiny; the radical ones on long, slender petioles, cauliue 

 in about 3 pairs, closely sessile by a cordate base or the lowermost some- 

 what petioled; heads solitary or 1-2 additional from the uppermost 

 axils, rather small; involucre obconic; scales lanceolate; acuminate; 

 somewhat hairy towards the base; ligules narrow; achenia nearly 

 smooth. Parry, 408. White House Mountain, at 12,000 feet altitude, 

 Coulter. 



ARNICA CORDIFOLIA, Hook. Woolly-pubescent, becoming glabrate 

 with age; caudex slender, creeping; stems 6'-14' high; leaves thinnish, 

 radical and lower ones cordate, roundish, obtuse or acute, on long slen- 

 der petioles, denticulate or sharply toothed, the cauline 1-3 pairs, on 

 shorter petioles, less deeply cordate and more acute, the highest pair 

 sessile; heads rather large, 1-3, on long peduncles; involucres villous- 

 pubescent; scales lanceolate, often somewhat abruptly acuminate; 

 acheuia hirsute. Hall & Harbour, 336. Common; alpine andMib-alpine; 

 very variable in size. Gray's Peak, Dr. Smith. South Park, Canby. 

 Meehan. Sierra Madre Range, Mount Lincoln, at 13,000 feet altitude, 

 Twin Lakes and Clear Creek Canon, Coulter. 



SENECIO LTJGKENS, Richards. Perennial, white-tomentose,deciduously 

 lanate or nearly smooth; stem G'-2 high, often several from one root; 

 leaves glandular- toothed or denticulate, sometimes entire, obscurely 

 veined, 2 / -8 / long, 6 /7 -2' wide, the radical obovate or oblong-spatulate 

 obtuse, narrowed into a petiole, cauline sessile and partly clasping, lan- 

 ceolate; corymb open or dense; heads variable in size, usually rather 

 large; involucres with a few bractlets at the base; scales linear-lanceo- 

 late, acute, with blackish-purple tips; rays from 10-12, oblong linear; 

 twice as long as the involucre; acheuia glabrous. 



Var. HOOKERI, Eaton. King's Rep., vol. 5, p. 188. (8. lugens. Hook. 

 Fl. Bor. Am. 1, 332, t. 114.) Deciduously tomentose or smooth; stem 

 simple; leaves entire or glandular-toothed; radical ones oblong spatu- 

 late, cauliue lanceolate, acute, clasping; corymb dense; scales of the 

 involucre conspicuously sphacelate. Dr. Smith. Canon City, Brantlegec; 

 Meehan. Sierra Madre Range, at 11,500 feet altitude, Coulter. 



Yar. PARRYI, Eaton. I.e. Slightly webhy at first, becoming glabrate; 

 leaves mostly not toothed, rather broad ; involucral scales scarcely or 

 not at all blackened at the tips. Long's Peak and Head of Boulder 

 Canon, Coulter. 



Var. EXALTATUS, Eaton, 1. c., (S. exaltatm, Nutt.) Stem and corymb 

 densely webby-tomentose, stout, li-2 high ; leaves nearly entire or 

 finely glandular-denticulate, ample ; lower ones sometimes 9' long 

 and 2' broad; heads small, in a dense compound, somewhat umbel-like 

 corymb ; scales of the involucre Avith a dark midvein and the tips some- 



