372 JACK’S MALAYAN PLANTS. 
nectaries. In the following species the placentation is peculiar; 
I know not whether the American plants exhibit the same 
structure, as it is not mentioned in any description which I 
have seen, but if it should prove on examination that they do, 
it ought to form part of the generic character. Loureiro’s 
Hypericum Cochinchinense, which undoubtedly belongs to 
Elodea, appears to be very nearly related to my £. Sumatrana, 
and his description of the seeds seems to indicate a structure 
similar to what I have observed. "The Hypericum petiolatum 
of the same author seems also referable to this genus, and 
to be different from Linnzeus’ H. petiolatum which is a native 
of Brazil. In all the species now referred to Elodea the 
generic distinction appears to receive confirmation from 
certain differences of habit which may be remarked between 
them and the true Hyperica, particularly in the colour of 
the flower, which in the latter is almost without exception 
yellow, but in Elodea is often red. 
& The Elodea of Jack is not the same as the North American 
. genus of that name, but corresponds with the section 
of Hypericum called Tridesmos, which has been (although 
Jack's paper was then unknown to them) suggested 
by Messrs. Hooker and Arnott (Bot. of Beech. Voy. 
p. 172), as the type of a genus to be named Tridesmos. 
GAWA 
ELODEA SUMATRAN A W. J. 
Folin subsessilibus oblongis attenuato-acuminatis glabris 
rigidiusculis, paniculis terminalibus foliosis, staminibus nume- 
rosis triadelphis, petalis basi nudis. 
Found at Tello Dalam in the island of Pulo Nias. 
A large shrub or small tree. Branchlets rather com- 
pressed, obscurely four-sided. Leaves opposite, almost sessile, 
oblong, tapering to the point, acute, broad at the base, entire, 
smooth ; nerves proceeding from a middle rib, strong, six 
or seven inches in length; the surface appears by the aid of 
the microscope to be dotted with opaque points. Panicles 
