86 SIR DIETRICH BRANDIS—AN ENUMERATION 
British Museum under this name has leaves somewhat resembling 
Dipterocarpus pilosus, but much smaller. The small winged fruit 
is detached, but has the same kind of hairs as the leaves. The 
wings of the calyx-tube are narrow. Has this specimen really 
come from Tipperah ? 
It may be useful here briefly to review the 4 species described 
by Dr. Francis Hamilton in Mem. Wernerian Society, vi. p. 298, 
all from Tipperah (Tripura)—D. levis, Ham., and scaber, Ham., on. 
the hills ; D. costatus, Gaertn. f., and turbinatus, Gaertn f., near 
the coast. His paper was read in 1825, but was not published 
until 1832. Two of these species, D. scaber and costatus, have 
the fruiting-calyx 5-winged; while in D. levis and turbinatus 
the calyx-tube is smooth, without wings. Hamilton states that 
D. costatus and D. levis produce wood-oil and are consequently 
called Telia Gurjun, while D. scaber and D. turbinatus only 
produce wood and are called Dulia Gurjun. 
In 1814 Roxburgh had enumerated in his * Hortus Bengalensis,’ 
and described in the ‘ Flora Indica,’ the MSS. of which he left at 
the Gardens when he went to Europe that year, three species 
from Tipperah and Chittagong, viz.:—one with unwinged fruit, 
D. turbinatus, Gaertn. f., as Telia Gurjun, and two with winged 
fruit, viz. D. costatus, Gaertn. f., with linear-oblong leaves (Telia 
Gurjun), and D. incanus, Roxb. (Gurjun). The latter, he reports, 
is said to furnish the largest proportion of the best sort of wood-oil.. 
The tree described by Roxburgh as D. costatus, Gaertn. f., Wight 
and Arnott (Prodromus Fl. Penins. Or. p.84) called D.angustifolius. 
This, however, is merely a name, which need not trouble us any 
further. When Dr. Hamilton wrote his paper in 1825, he had 
possibly seen neither the ‘ Hortus Bengalensis’ nor the MSS. of 
Roxburgh’s * Flora Indica, which was not printed until 1832. 
The probability is, that besides Dipterocarpus pilosus there is 
only one species with unwinged fruit in the Chittagong and 
Tipperah district, viz. D. turbinatus, as here defined, and only 
one species with winged fruit. This latter may, or may not, turn 
out to be Hamilton’s D. scaber, and it may possibly prove to be 
identical with what Roxburgh described as D. incanus. Researches 
on the spot in the forest alone can clear up this knotty but in- 
teresting question. All species of Dipterocarpus yield wood-oil ; 
and Dr. Hamilton’s account of one winged and one unwinged 
species yielding wood-oil, while the other two only yield wood, 
need not be seriously taken into consideration. 
