SYNOPSIS OF THE FLORA OF COLORADO. 59 



cated in about 3 series; rays numerous, pale purple or rose-color ; ap- 

 pendages of the style subulate ; achenia densely villose. South Park, 

 Canby ; Porter. 



MACH^ERANTHERA CANESCENS, Gr. Minutely canescent with a soft 

 pubescence ; stem low, much branched, corymbose ; leaves linear, entire 

 or sparsely toothed towards the apex ; scales of the obovoid involucre 

 lanceolate, acute, imbricated in about 4 series, with slightly squarrose 

 tips ; rays 18-20. rather large, purplish-blue ; appendages of the style 

 subulate-lanceolate. T. & G., Fl. N. Am. 2, p. 101, under Dieteria, Nutt. 

 Exceedingly variable in its pubescence, inflorescence, size of the 

 heads, toothing of the leaves, and involucres. Georgetown, Dr. Smith. 



Var. LATTFOLIA, Gr., PI. Wright. 2, p. 75. (Dieteria asteroides, Torr., in 

 Em. Rep., p. 142.) Scabrous pubescent or puberulent ; stems lS'-2 high ; 

 leaves oblong or lanceolate, sharply and rather coarsely toothed, broader 

 leaves 6 /7 -8 7/ wide; involucre hemispherical, scales linear, in several 

 series, with rather short, subulate, green, squarrose tips ; heads large, 

 variable in size. Foot-hills, near Denver, Porter. Georgetown, Dr. 

 Smith. Sierra Madre Kange, Coulter. 



Var. ALPINA, Porter. Dwarf, 2'-3 7 high, puberulent; radical leaves 

 cuneate-spatulate, obtuse ; stems short, bearing 1-2 large heads, V in 

 diameter; scales of the involucre lance-linear, tips long, squarrose- 

 spreading, glandular-pubescent. Alpine. Parry, 1872. 



MACH^ERANTHERA TANACETIFOLIA, Kees. (Dieteria coronopifolia, 

 Kutt. T. & G. Fl. N. Am. 2, p. 101.) Pubescent and somewhat viscid, 

 diffusely branched below, branches 6 / -12 / long, branchlets terminated 

 by single showy heads; radical and lower leaves bi-pmuatifid, petioled, 

 the upper pinnatifid with the segments toothed or incised ; scales of 

 the involucre nearly equal, in about 3 series, linear, with a short, ap- 

 pressed, somewhat cartilaginous base, and very long, acute, loose, spread- 

 ing, herbaceous tips ; rays about 20, large, reddish-purple ; appendages 

 of the style subulate ; pappus pale reddish-brown, copious, rather rigid ; 

 achenia obovate, many-striate, villous. Hall & Harbour, 285. Canon 

 City, Brandegee. Canby. Georgetown, Dr. Smith. Denver, Redfield. 



DIPLOPAPPUS ERICOIDES, T. & G. Fl. N. Am. 2, p. 182. Strigosely 

 canescent ; stems 2'-6' high, branching from a suffrutescent base ; leaves 

 narrowly spatulate or linear, 2"-6" long, crowded, appressed or spread- 

 ing, rigid, mucronate, often bristle tipped, conspicuously ciliate ; heads 

 terminal on the ends of the strict branches, rather small; scales of the 

 involucre lanceolate-linear, in about 3 series, acute, 1-nerved, with scari- 

 ous margins ; rays rather short, white ; exterior pappus very minute ; 

 achenia pubescent. Hall & Harbour, 233. Canon City, Brandegee. 



ERIGKERON CANADENSE, L. Near Canon City, Brandegee. Denver, 

 Dr. Smith; Coulter. 



ERIGERON DIVARICATUM, MX. Xear Denver, Dr. Smith. 



ERIOERON COMPOSITUM, Pursh. More or less canescently hirsute ; 

 stems 2 / -6 / high, several from a perennial root-stock, scape- like or with 

 a few leaves near the base, and one or two linear bracts higher up ; 

 leaves on long petioles, 1-3 times teruately divided or parted, lobes ob- 

 long-linear, obtuse ; scales of the involucre linear, in 2 rows, outer ones 

 herbaceous, inner ones scarious with narrow margins and long slender 

 tips ; rays many, twice the length of the involucre ; white, pale-pink, 

 or blue ; achenia hirsute ; pappus of 12-15 bristles, with a few minute 

 setae intermixed. Hall & Harbour, 234. Gray's Peak, B. H. Smith. 



