214 PITTONIA. 
of the last, the much taller and more slender less leafy 
stems strongly decumbent, usually a foot high or more, the 
herbage of a brighter green, the stems red-purple: lowest 
leaves very narrowly oblanceolate, 4 or 5 inches long in- 
cluding the petiole, the cauline half as long, linear, incurved, 
and with a fascicle of small ones in their axils, all of firm 
texture, quite entire sparsely strigulose and the margins 
rough with a short incurved ciliation: heads solitary, or 
more commonly 3 to 5 and corymbose, nearly 1 inch high, 
almost hemispherical: involucre of about 3 series of unequal 
and distinctly imbricated bracts all with purple herbaceous 
erect tips, the outer obtuse, all pubescent externally and 
more or less ciliolate: rays violet. 
Dry ground at base of Little Ouray Mountain east of 
Marshall Pass, Colorado, 4 Sept., 1896; collected by the 
writer. An elegant species, with involucre red-purple as in 
some Machexranthera species; but a most genuine Aster. 
A. ARMERLEFOLIUS. Stems several, less than a foot high, 
subscapiform and corymbose from a branching crown bear- 
ing tufts of so-called radical leaves; these erect 3 to 5 inches 
long, oblanceolate, petiolate, entire, acute, deep green and 
glabrous, reticulate-venulose, the few and scattered cauline 
spatulate-linear, sessile, all scabrous-ciliolate: pedunculi- 
form purple stems glabrous except for traces of the usual 
pubescent-lines: heads rarely solitary, commonly 3 to 10, 
nearly $ inch high, involueres almost hemispherical, their 
spatulate-linear bracts in about 3 series, all herbaceous 
almost throughout, obtuse, the outer very distinctly though 
finely ciliate at least to above the middle, all traversed from 
ase to apex by a fine but distinct mid-nerve; rays 40 or 
more, violet: achenes moderately compressed, with 4 or 5 
unequally distributed but very obvious angles, the sides 
