3450

5(1): Timber trees; Major commercial timbers

Dipterocarpus alatus Roxb. ex G. Don

This article should be read together with the article on the genus: Dipterocarpus in the Handbook volume indicated above in this database.

Gen. Syst. 1: 813 (1831).

Dipterocarpus philippinensis Foxw. (1911).

Philippines: hairy-leafed apitong (general), apinau (Tagalog), ayamban (Iloko). Cambodia: chhë: ti:ël bângku:ëy, chhë: ti:ël ba:y, chhë: ti:ël tük. Laos: (maiz) nha:ng, nha:ng kha:w. Thailand: yang-na. Vietnam: d[aaf]u r[as]i.

Burma, Thailand, Laos, Cambodia, Vietnam and the Philippines (Luzon).

The timber is used as keruing; Dipterocarpus alatus is a very important source of construction timber in Indo-China and Thailand.

A medium-sized to fairly large tree of up to 40 m tall (but probably sometimes more), bole tall, straight, cylindrical, branchless for up to 20 m, up to 150 cm in diameter; buds lanceolate, yellow pubescent; leaves narrowly ovate to ovate to elliptical-oblong, 9-25 cm 3.5-15 cm, base cuneate to rounded, apex acute or shortly indistinctly acuminate, secondary veins 11-18(-20) pairs, sparsely pubescent above, beneath densely persistently pubescent, petiole 2.5-4.5 cm long, stipules greyish-yellow pubescent; fruit calyx tube glabrous, subglobose, with 5 wings to 8 mm broad, 2 larger fruit calyx lobes up to 14 cm 3 cm, 3 shorter ones up to 12 mm 14 mm. Dipterocarpus alatus occurs gregariously along rivers in Indo-China and Thailand up to 500 m altitude. There it is a rapid colonizer of alluvial soils. In the Philippines it is rare, occurring in mixed dipterocarp forest in seasonal areas at low and medium altitudes. It was recently (1993) discovered that Dipterocarpus alatus and Dipterocarpus philippinensis are conspecific. The density of the wood is 620-905 kg/m³ at 15% moisture content.

[175]de Guzman, E, R. M. Umali, & E.D. Sotalbo, 1986. Guide to Philippine flora and fauna. Vol. 3: dipterocarps, non-dipterocarps. Natural Resources Management Center, Ministry of Natural Resources & University of the Philippines, Manila. xx + 414 pp.
[235]Flore du Cambodge du Laos et du Viêtnam (various editors), 1960–. Muséum National d'Histoire Naturelle, Paris.
[258]Fundter, J.M., 1982. Names for dipterocarp timbers and trees from Asia. Pudoc, Wageningen. 251 pp.
[579]Reyes, L.J., 1938. Philippine woods. Technical Bulletin No 7. Commonwealth of the Philippines, Department of Agriculture and Commerce. Bureau of Printing, Manila. 536 pp. + 88 plates.
[627]Smitinand, T., Tompsett, P.B. & Cheek, M., 1993. A new synonym and a range extension for Dipterocarpus alatus. Kew Bulletin 48: 397–399.
[628]Smitinand, T., Santisuk, T. & Phengklai, C., 1980. The manual of Dipterocarpaceae of mainland South-East Asia. Thai Forestry Bulletin 12: 1–110.
[748]van Steenis, C.G.G.J. & de Wilde, W.J.J.O. (Editors), 1950–. Flora Malesiana. Kluwer Academic Publishers, Dordrecht, Boston, London.

L.E. Groen

Groen, L.E., 1993. Dipterocarpus alatus Roxb. ex G. Don. In: Soerianegara, I. and Lemmens, R.H.M.J. (Editors): Plant Resources of South-East Asia No 5(1): Timber trees; Major commercial timbers. PROSEA Foundation, Bogor, Indonesia. Database record: prota4u.org/prosea