SYNOPSIS OF THE FLORA OF COLORADO. 61 



petioles, entire and oblanceolate, canline ones sessile, smaller, oblong- 

 linear or linear-spatulate ; heads few or many, rather small, terminating 

 the branches, pedunculate; involucre hirsute-can escent; rays very 

 many (60-70,) white or pale-red, narrowly linear, twice as long as the 

 involucre; achenium minutely pubescent; pappus simple and wholly 

 deciduous from a broad and white epigynous disk. Plains and moun- 

 tains. South Park, Canby. Colorado Springs, Porter. 



ERIGERON MACRANTHUM, Nutt. Pubescent or nearly smooth ; stems 

 9'-30' high, several from a creeping rhizoma, leafy to the summit; leaves 

 smooth or hairy, ciliate on the margins, obtuse, acute or acuminate, 

 inucroimlate, entire, the lowest oblong-spatulate, tapering into a petiole, 

 2 / -4' long, 6" -8" wide, the upper oblong or broadly ovate lanceolate, 

 3-nerved, the lateral nerves starting from the base, partly clasping; 

 heads several, 3-13, corymbose, sometimes very large; involucre of many 

 very narrow-linear, acuminate, herbaceous, glabrous or glandular scales, 

 which are sometimes pubescent; rays blue or purple, numerous; achenia 

 2-3 nerved, slightly hairy; outer pappus of short, slender set*. Varies 

 greatly as to the amount of pubescence. South Park and Chiaun Canon, 

 Porter. Pike's Peak and mountains west of Denver, Canby. Twin Lakes 

 and in the Sierra Madre Range, Coulter. 



ERIGERON GLABELLUM, Nutt. Pubescent or nearly glabrous; stems 

 9'-20' high, single or few from a short erect caudex, simple or sparingly 

 corymbose at the summit; radical leaves narrowly or broadly spatulate, 

 tapering into a long or short petiole, sometimes serrate or incisely 

 toothed; lower cauline ones oblong, lanceolate, tapering into long, mar- 

 gined petioles, the upper ones scattered, lanceolate or linear, sessile and 

 partly clasping; heads few, large, 10"-15" broad, on long, strict peduncles 

 which are enlarged above; rays very narrow and numerous; involucre 

 hirsute or nearly smooth ; achenium and pappus as in the last. Hall 

 & Harbour, 240. Canon City, Brandegee. Gray's Peak, Dr. Smith. 



ERIGERON COTJLTERI. Porter, (n. sp.) Stem simple from a slender root, 

 6'-12 / high, bearing a single head, smooth below, pilose-pubescent above, 

 leafy to the top; leaves thinnish, pubescent with ciliate margins, all 

 more or less serrate-denticulate, mucronate, erect, gradually diminishing 

 in size upward; lower ones oblong-spatulate or elliptical, tapering into a 

 margined, ciliate petiole, upper ones oblong or lanceolate, acute or acumi- 

 nate, sessile and partly clasping; head large, l'-2' broad including the 

 numerous white rays; involucre about 9" broad, hemispherical, densely 

 pilose but scarcely woolly; scales lance-linear, with scarious margins, tips 

 elongated, subulate, spreading, glandular; achenia pubescent; bristles 

 of the pappus minutely scabrous, outer ones short and few; alveoli of 

 the receptacle rough, with lacerate margins. Weston's Pass, at 10,000 

 feet altitude, July 19, Coulter. 



ERIGERON PUMILUM, Nutt. Very hirsute with spreading hairs, stems 

 6'-10' high, rather stout, numerous from an erect, branching caudex, 

 simple or sparingly branched, bearing 1-3 peduncled heads, leafy; lower 

 leaves linear-spatulate, 2'-2' long, l"-3" wide, upper ones narrowly 

 linear, passing into subulate "bracts; heads 9 // -12' / broad; scales of the 

 involucre numerous, nearly linear, hirsute; rays white, 30 of them, 1' 

 wide, twice or nearly three times as long as the involucre; achenia 

 slightly hairy; outer pappus of minute subulate bristles. Upper Arkan- 

 sas, Porter. Saint Vrain Eiver, Coulter. 



ERIGERON DIVERGENS, T. & G. Somewhat hoary with a minute hir- 

 sute pubeseuce, diffusely branched from the base, branches ascending, 



