230 PITTONIA. 
long to androsemifolium, but the habit, the leaf-posture and 
even the leaf-outline that so distinetly characterize cannabi- 
num. No botanist seeing the plants when past flowering 
would doubt their being A. cannabinum ; yet, as I have said, 
when in flower they are, in spite of all, taken as belonging 
to androsemifolium ; yet the corolla is in its pattern not that 
of the last named, but more nearly that of the other. The 
new species has a fine Pacific American homologue in the 
middle Californian A. floribundum. 
APOCYNUM ALBUM. Near A. cannabinum, but of lower 
stature and much more freely branching, but the branching 
dichotomous: herbage very light green, wholly glabrous: 
leaves elliptic-lanceolate, elliptic, or oblong, acute, those of 
later and sterile branches small, narrow and almost crowded : 
cymes small and few-flowered as compared with those of A. 
cannabinum: segments of the calyx rather broadly lanceo- 
late, nearly equalling the very small clear white campanu- 
late erect corollas: pods slender, deflexed, one in each palir 
straight, the other falcate. 
Common in moist land along the Potomac River, and 
perfectly distinct in the character of its flowers; as also o 
marked divergence from A. cannabinum in its whole aspect. 
The leaves are distinctly more narrow and elongated than 
in any form of that. I think it not impossible that this 
may be the species of which the A. pubescens, R. Br., might 
prove a pubescent form; but, as I have not access to Brown $ 
diagnosis, I am unable to form a well grounded opinion. 
I may add that the research which the segregation of 
these two proposed species has entailed has brought me oe 
conviction of the validity of Hooker’s A. hypericifolium. 
