English Lao
Botanical descriptions Habitat and ecology Distribution
| Diagnostic characters : | Large evergreen trees with buttresses, bark smooth or slightly fissured. Exudate resinous, yellowish. Leaves simple alternate and distichous, leaf base round, below with stellate hairs. Stipules present. Fruit a winged nut with 5 long wings more or less the same length. |
| Habit : | Evergreen big tree, 40-50 m height and 80-100 cm in diameter. Crown open. |
| Trunk & bark : | Trunk straight, cylindrical with small buttresses at base. Bark grey or brownish-pink, smooth or with slight longitudinal fissures, inner bark slightly aromatic, outer bark green. . |
| Branches and branchlets or twigs : | Twigs terete with stellate hairs. |
| Exudates : | Exudate yellow, resinous. |
| Leaves : | Leaves simple alternate, 6-20 by 2,7-8 cm, elliptic-oblong, shortly caudate at apex. Midrib raised on both sides, secondary veins obtuse, widely parallel, tertiary veins reticulate. |
| Inflorescences or flowers : | Flowers small and fragrant grouped in terminal or axillary panicles, densely and softly hairy with stellate hairs. Pedicel less than 0.5 cm long. |
| Fruits : | Fruit is a nut, ovoid to ellipsoid, 2.2-2.8 by 1.1-1.5 cm with an acute beak bearing 2 large wings and 3 smaller wings, densely covered with silky hairs. |
| Seeds : | Seed 1. |