SYNOPSIS OF THE FLORA OF COLORADO. 81 



what blackened. Hall & Harbour, 325. Gray's Peak, Dr. Smith. 

 Sangre de Cristo Pass, Brandegee. Meehan. Clear Creek Canon and 

 Mount Lincoln, at 12,000 feet altitude, Coulter. 



SENECIO TRIAN&ULARIS, Hook. Glabrous throughout ; stems 2-4 

 high, simple, striate, leafy, 3-4 from one root; leaves 3'-5' long, !J'-3' 

 wide, deltoid-ovate or triangular-lanceolate, sharply and unequally re- 

 pand-dentate or cut-toothed, acute, truncate or subcordate at the base or 

 abruptly narrowed into a winged petiole ; heads rather large, 6" long, 

 few in a loose or sometimes fastigiate corymb ; involucre subcyliudraceous, 

 with a few subulate bractlets at base ; scales about 15, lanceolate, with 

 sphacelate tips; rays 6-9, less than twice as long as the involucre; 

 acheuia striate, glabrous. ITaM & Harbour, 323. Twin Lakes and 

 Mount Lincoln, at 12,000 feet altitude, Coulter. 



StfNECio ANDINUS, Nutt. Glabrous ; stems many from one root, 

 20.40 high, simple, striate, very leafy; leaves 3 / -5 / long, 3"-10" wide, 

 linear-lanceolate, acute at both ends, sharply serrulate with incurved 

 teeth, upper ones sessile, lower ones short-petioled ; heads 4" long, 

 numerous, in panicled corymbs ; involucres calyculate with small subu- 

 late bracts; rays 5-8; disk-flowers 12-20; achenia glabrous. Hall & 

 Harbour, 324. Sierra Madre Range, Coulter. 



SENECIO INTEGERRIMUS, BTutt. Glabrous throughout ; stem simple, 

 striate, 12 / -18 / high; leaves entire; radical ones 3'-5' long and V-% 

 wide, rather obtuse, tapering into a petiole, somewhat fleshy, upper 

 small, lanceolate, acute, partly clasping; corymb simple or nearly so; 

 heads rather large, 8-20; involucre hemispherical, bracteolate, scales 

 15-20, narrowly linear, acute, rays about 8, small; disk flowers 40-50; 

 achenia striate, nearly glabrous. Hall & Harbour, 318. "A low form; 

 alpine." 



SENECIO AUREUS, L. An extremely variable species, very abundant 

 among the mountains, of which the following are the most marked varie- 

 ties : 



Var. ALPINUS. Gr., Sill. Jour. (JV. S.) v. 33, p. 11. Stem scapiform, 

 bearing 1-2 heads, 3' high, bracteate ; radical leaves coriaceous, rounded 

 or obovate-oblong, almost veinless, very entire or somewhat 3-toothed 

 at the apex. Hall & Harbour, 229. White House Mountain, at 13,000 

 feet altitude, Coulter. The specimens of the last collection have the 

 leaves more denticulate; heads sometimes 3. 



Var. WERNERI JEFOLIUS, Gr. Proc. Am. Acad., March, 1863, p. 68. Note. 

 Csespitose, at first arachnoid- woolly; radical leaves numerous, spatulate, 

 oblaiiceolate or spatulate-liuear, attenuate at the base, erect, coriaceous, 

 rigid, veinless, very entire, margins frequently revolute, becoming gla- 

 brate, with the petiole 2 / -4 / long, 2 // -3 // broad ; scapes leafless, 3'-5' high, 

 bracts few, subulate-setaceous, wrapped in wool ; corymb 3-8 headed. 

 Hall & Harbour. Clear Creek Canon, Coulter. 



Var. OBOVATUS, T. & G. Radical leaves roundish-obovate or broad- 

 ly spatulate, toothed or serrated. White House Mountain, at 11,500 feet 

 altitude, Coulter. 



Var. BOREALIS, T. & G. Smooth ; radical leaves thickish, obovate or 

 spatulate, entire or crenulate-toothed at the apex only. Hall & Har- 

 bour, 333 ; Dr. Smith; B. H. Smith. Clear Creek Canon and Twin Lakes, 

 Coulter. 



Var. BALSAMIT^E, T. & G. More or less woolly, becoming glabrous ; 

 radical leaves oval and oblong, spatulate and lanceolate, crenate, sharp- 

 ly crenate-toothedor lyrately-incised; achenia glabrous or strigose on the 

 6F c 



