400 BOTANICAL GAZETTE [JUNE 
I am aware in pronouncing this plant an Oonopsis that I am putting into 
this genus a monocephalous species and another rayless one, but the habit is 
thoroughly characteristic. The hue of the leaves, which retain their foliar 
character up to the heads which they surpass, the appearance of the involu- 
cre, and the floral characters are in perfect accord with the genus. 
The specimens upon which the species is founded were submitted to me 
by Professor Ramaley, of the University of Colorado, and are the collection 
of Jennie M. Archibald, at Berwind, Colorado, in Igoo, no. 257. 
WESTERN EUPATORIEAE. 
Eupatorium atromontanum, n. sp.—Tall, 1-2™ high: stems 
with an obscure short white puberulence, striate, greenish or 
mottled with purplish-brown: leaves verticillate in fours, short 
petioled, ample, from ovate-acute to lanceolate-acuminate on 
the same plant, 12-25°™ long, 4-10™ broad, much exceeding the 
internodes, coarsely serrate, the teeth broadly triangular and 
apiculate, rather thin, prominently veined below, glabrate above 
and dark green, lighter and with a short fuscous puberulence 
underneath, sprinkled with minute, shining, resinous dots: inflo- 
rescence corymbose-cymose or more paniculate, equaled or 
more often overtopped by the uppermost leaves; the peduncles 
of the cymes arising from the axils of the leaves of the 2 or 3 
uppermost verticils cinerous-pubescent as are also the numerous 
short slender pedicels: involucral bracts in 4 or 5 series; the 
outer short, elliptic ; the second and third more broadly elliptic or 
oval, about 7™™ long, pubescent, with 3 greenish striae and scari- 
ous Margins; the inner and longest becoming oblong and almost 
wholly scarious: heads about 15-flowered: corollas tubular 
(hardly at all dilated upwards): akene obscurely angled, dotted 
with resin particles, linear, but slightly shorter than the some- 
what unequal pappus. 
This finds its nearest ally in the somewhat polymorphous £. maculatum 
The more typical form of that differs from this in the thicker, usually 
rugose leaves which at the summit become smaller or bract-like, leaving the 
inflorescence naked (surpassing the leaves), That also has a harsher, more 
copious pubescence, different involucral bracts, and fewer flowers in the head. 
E. atromontanum is represented in the Rocky Mountain Herbarium by 
two collections, as follows; 2251, Sheridan, July 10, 1896; 2553, Beaver 
creek, Black hills, Wyoming, July 30, 1896 (type). 


