Dipterocarpus alatus Roxb

[From Greek, dis = two, pteron = wing, karpos = fruit and from Latin, alatus = having wings]

Resveratrol

Synonymy: Dipterocarpus incanus Roxb., Dipterocarpus gonopterus Turcz.

Common names: Kanyin (Burmese); yang khao (Thai); chhoeuteal trach (Cambodian); chhoeu teal thom (Laos, Vietnamese).

Physical description: It is a resinous timber which grows to a height of 45 m and a girth of 4 m. It is found in the lowland tropical rainforest of Burma, Cambodia, Thailand, Malaysia, Laos and Vietnam. The bark is pale grey and the bole of 1 m diameter. Leaves: simple, alternate and stipulate. The stipules are 5cm-9cm long and covered with stellate hairs. The petiole is stout, 3.9cm-2.5cm long, woody, obscurely

Uses: The resin of Dipterocarpus alatus Roxb. is used externally to heal wounds and to counteract putrefaction in several Southeast Asian countries. In Cambodia, the bark is used to invigorate health, expel impurities, and to treat rheumatism and liver complaints, while the resin is used to heal ulcerated wounds. In India, the resin is used to treat gonorrhea. In Cambodia, Laos, and Vietnam, the resin is used to heal ulcerous sores and to treat blenorrhagia. In Thailand, the bark is used to invigorate health and to mitigate toothache, while the resin is used to heal the wounds of cattle. The resin is used for varnishing. To date, the pharmacological potential of Dipterocarpus alatus Roxb. is unexplored.

Fig. 84. Dipterocarpus alatus Roxb. From:KLU Herbarium 12598. Plants of Cambodia. Field collector.: Benjamin C Stone, 21 Mar 1970. Geographical localization: Siem Reap, along route to Angkor Wat, Cambodia. Botanical Identification: Ashton 14 Feb 1973.

flattened above, knee-shaped and cracked transversally near the base of the blade. The blade is ovate, thick, 10cmx20cm-5.7cmx11.3cm, glabrous on the surface and shows a few stellate hairs below. The apex of the blade is acute, the margin is wavy and recurved, and the blade shows 12-18 pairs of secondary nerves. The tertiary nerves are scalariform, visible from below, and obscure above. The flowers are arranged in axillary 37 flowered spikes. The calyx is tubular and 1 cm-1.5cm long. The petals are 3 cm long and pubescent outside. The andrecium comprises of 30-32 stamens with flattened, 3.8 mm long filaments and 4.5 mm long anthers, the connectives of which produce a bristle of 3mm-8mm in length. The ovary is densely tomentose and the style 10mm long. The fruits are 5-winged and somewhat bluish 2.5cm- 2.8cm nuts with a pair of oblong, 12.5 cm x 2.6cm-11 cm x 1.8 cm, hard, somewhat glaucous and 3-nerved wings (Fig. 84).

Warning: Caution must be taken as the toxic effects of this plant are unknown.

Fig. 84. Dipterocarpus alatus Roxb. From:KLU Herbarium 12598. Plants of Cambodia. Field collector.: Benjamin C Stone, 21 Mar 1970. Geographical localization: Siem Reap, along route to Angkor Wat, Cambodia. Botanical Identification: Ashton 14 Feb 1973.

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