Dipterocarpus pilosus Roxb.
Dipterocarpus turbinatus sensu Buch.- Ham.
Growth Habit: Tree
Bangla/Vernacular Name: Duli-garjan, Sil-garjan, Arjan (Chittagong), Dhuli-garjan (Chittagong)
Tribal Name: Jangby (Khumi).
A tall tree. Leaves elliptic, elliptic-oblong or elliptic-lanceolate, acute or abruptly acuminate, coriaceous, upper surface adpressed hairy when young, lower surface pilose and tomentose. Flowers in axillary few flowered racemes.Fruit-belly subglobose.
Plant contains sesquiterpene, ?-gurjunene, oleoresin, a mixture of tetra and pentacyclic sesquiterpenes (18%) containing caryophyllene, its oxide, humulene and triterpene fraction ( 80%) with dipterocarpol and several related compounds, asiatic acid and its 2-Ac derivetives and 2-a- OH-ursolic acid (Asolkar et al., 1992).
Dipterocarpus gracilis Bl.
Timber is used as fuel and to prepare furniture and household materials (Khumi). Oleo-resin of the bark is used in gonorrhoea, gleet and similar affections of urinary organs.
Occurrence is restricted in the forests of Chittagong Hill Tracts and Cox's Bazar.