54 SIR DIETRICH BRANDIS—AN ENUMERATION 
may be regarded as normal for this genus. These species are :— 
Sect. Euhopea: discolor, odorata, dealbata. Sect. Petalandra: 
fagifolia, Curtisii, Recopei. Sect. Dryobalanoides : intermedia, 
Pierrei, myrtifolia. In this type the cotyledons are thick fleshy, 
the outer rounded surface longitudinally channelled; both bifid 
to the point of attachment of the hypocotyl. The outer or radi- 
cular cotyledon generally more or less concave, embracing the 
inner or placentar cotyledon. Hypocotyl and petioles of coty- 
ledon half as long or as Jong as the seed, generally hairy, except 
the glabrous shining tip, imbedded on the outside of the embryo 
in a groove between the lobes of the outer cotyledon, while the 
lignified placenta with the remains of dissepiments intrudes 
between the lobes of the inner. From the type Hopea globosa 
differs by the position of the hypocotyl in the axis of the embryo 
between the inner edges of the 4 cotyledonary lobes. In H. 
nervosa the hypocotyl is short, not enveloped by the cotyledons, 
which are both directed towards the base of the seed, one being 
bifid, the other emarginate. In H. ferrea the hypocotyl is nearly 
as long as the cotyledons, which are both bifid, the two lobes of 
one being turned upwards, while the lobes of the other are 
directed towards the base of the fruit. These three species 
belong to the section Euhopea. In Dryobalanoides are three 
species with albuminous seeds when ripe, and thin foliaceous 
cotyledons, viz.: H. Beccariana, Mengarawan, and cernua. The 
albumen is gelatinous. The non-nitrogenous substances stored 
in the cotyledons of Hopea are starch and fat, the former 
generally prevailing. 
It appears most convenient to adopt the old division into 3 
sections:—(1) .Euhopea and (2) Petalandra, with a limited number 
of prominent secondary nerves, the former with 15, the latter 
with 10 stamens; (8) Dryobalanoides, with numerous but not 
distinct secondary nerves and 15 stamens. 
The anatomical structure of the different species of Hopea 
shows greater variety than is generally found in the genera of 
this family. It will be convenient, in the first instance, to describe 
the structure of Hopea cernua, T. et B. At the base of a leaf- 
bearing internode the pith has a triangular shape, two sides being 
straight and the third concave. Three large resin-ducts are always 
present, and they are located in the corners of the triangle. In 
most cases there is a fourth duct in the third concave side of the 
triangle. This fourth duct is intended for the apical leaf-trace 
