1898] HUPHORBIAS OF DR. PALMER'S DURANGO COLLECTION 15 
have an exact counterpart of Dr. Palmer’s 206 Durango ina 
specimen collected by myself at Waverly, N. Y.; this form has 
all the leaves large, broad, and lurid. His Durango 894 (similar 
but with pale green leaves) is duplicated in H. N. Patterson’s 
Oquawka (Ill.) form; while his Durango 900, with its slender 
and strongly falcate leaves, has its counterpart in Addison 
Brown’s Rhinebeck (N. Y.) and W. C. Werner’s Painesville 
(Ohio) plants. These are all very evident Z. Pres/ii, but in a 
large number of forms from Rio Janeiro to Canada the macro- 
scopic differentiation between this species and &. hypericifolia is 
almost impossible, as the erect or prostrate growth, the smooth 
or hairy branches, the full or part serration of the leaves, the 
fimbriation or ciliation of the triangular or lanceolate stipules, 
the presence or absence of a red spot on the leaves, the size or 
shape of the glandular appendages or lobes, and the depth of 
the sulcus bifurcating the styles, intermixes both species in these 
characters; however, the seed stands out clear and definite in 
them all, that of &. Presiii being ovoid and black, and having a 
prominent lighter dorsal angle. 
The special characters of this species are as follows: Gland- 
ular appendages manifest and entire, the fifth gland replaced 
by a shallow sulcus 
flanked on each side 
by larger and lacer- 
ate involucral lobes, 
the other three. 
lobes being entire 
and triangular. The 
seeds are ovoid, 
black, with some- 
what ashen angles, 
1.3™"longando.8™™ 
broad; the ventral 
surface is strongly convex, the dorsal triangular with a promi- 
nent central ridge rendering the whole sub-quadrangular, the sev- 
eral partly anastomosing transverse ridges on each facet being 
S 
