GLEASON: TAXONOMIC STUDIES IN VERNONIA 243 
lent on the back, obtuse to broadly rounded at the tip, the mid- 
vein becoming prominent near the apex and usually prolonged into 
a minute mucro; achene minutely pubescent on the ridges; pappus 
pale tawny, its bristles 4 mm. long, the paleae narrowly linear, 
about 0.4 mm. long. 
Type: Maxon & Hay 3385, collected on dry plains near Salama, 
Guatemala, January 22, 1905, and deposited in the herbarium of ~ 
the New York Botanical Garden. 
Vernonia salamana apparently finds its nearest relative in the 
well-known V. patens H.B.K., with which it agrees in its achenes, 
pappus, involucral scales, olivaceous leaves, and the finely pubes- 
cent lower leaf-surface. The shape of the leaf-blade is unlike that 
of V. patens and is closer to that of V. Deppeana Less. The pubes- 
cence on the upper side of the leaf and the prominent venation are 
distinctive. 
VERNONIA MOLLIS H.B.K. 
A plant collected by the Brothers Seler, number 3377, has been 
identified by Hieronymus as V. mollis H.B.K. and distributed to 
American herbaria under that name. Ekman has considered the 
specimen as V. canescens H.B.K., to which it is obviously closely 
related, but from which it differs in the flat leaves and the tomen- 
tose lower leaf-surface, in its involucral scales, which are all sub- 
ulate, and in its general habit. At the same time, it is doubtful 
if it is the true V. mollis. This is a Colombian species, described 
as having leaves sericeo-lanuginous beneath. This character is 
met with in certain Colombian specimens in the New York collec- 
tions. 
: Vernonia ctenophora sp. nov. 
. Stem herbaceous, at least 4 dm. high, finely striate, thinly 
pubescent and resinous-dotted; leaves sessile or with petioles 
2-4 mm. long; leaf-blades thin, ovate-lanceolate, entire, acuminate, 
obtuse or rounded at the base, as much as 5 cm. long by 2 cm. wide 
or the upper somewhat smaller, thinly puberulent and con- 
spicuously glandular-dotted above, closely and finely gray- 
pubescent and resinous on the surface beneath and sparsely 
pubescent on the midrib and the obscure lateral veins; inflores- 
cence of two or three elongated, erect, terminal or subterminal 
cymes; bracteal leaves resembling the cauline and _ progres- 
sively " smaller, the upper only 15-20 mm. long; heads 20- 
35 mm. apart, sessile, 18-21-flowered; involucre campanulate, 
