OF THE DIPTEROCARPACER. 57 
and seed a number of peculiar characters, separating it com- 
pletely from the species of Hopea in question. 
A different and more correct proceeding would be, to restrict 
the name Hopea to the species of Section Euhopea, and perhaps 
of Petalandra also. In that case Dryobalanoides would constitute 
a separate genus. Before this is done, however, the anatomical 
structure and the structure of the seed of a much larger number 
of species must be studied than is the case at present. 
As at present constituted, 46 species of Hopea are known, 
which are distributed over the entire area occupied by the order, 
viz.: 3 species in Ceylon, 4 in the Western Peninsula of India, 
13 in the Eastern Peninsula, 23 in Borneo, Sumatra, and the 
other islands of the Archipelago, 2 in the Philippine Islands, 
and 1 in New Guinea. 
Sect. I. EUHOPEA. 
Secondary nerves conspicuous, not approximate, not more than 
20 pairs. Stamina 15, sometimes 12-15. Stylopodium always 
large. 
A. Ceylon. 
1. HOPEA DISCOLOR, Tu. Enum. Pl. Zeyl. (1859) 36; Trimen, 
Fl. Ceylon, i. 195.— Pl. II. figs. 5, 6. 
Leaves clothed beneath with a bright brown scurf consisting 
of very minute stellate hairs. Flowers pedicellate (calyx glabrous, 
2 bracteoles at base of pedicels), in short axillary panicles con- 
sisting of few short unilateral racemes. The racemes (branches 
of panicle) often stand in the axil of 3 bracts, the 2 lateral 
being stipular (fig. 6). In fig. 6, 1—1 is the main axis of the 
panicle, while 2—2 is that of the raceme. Of the 2 bracteoles 
subtending the first fl. of this raceme, one only is visible. Ovary 
and short conical stylopodium hairy; style glabrous; stigma 
minute (fig. 5). Cotyledons fleshy, the cells filled with starch, 
both bifid, the outer concave, embracing the inner, which is 
smaller. Radicle half the length of the embryo, pubescent in its 
upper part, black shining at the end. Placenta and dissepiments 
intruding between the lobes of the inner, smaller cotyledon. 
2. H. sucunpa, Thw. Enum. Pl. Zeyl. (1864) 403; Trimen, FI. 
Ceylon, i. 125. 
Secondary nerves 3-4 pairs, prominent, strongly curved, the 
2 upper meeting at the apex; tertiary nerves distinct, parallel, 
at right angles to the midrib. Panicles racemose, often longer 
