Lithocarpus dealbata (Hook.f. & Thomson ex Miq.) Rehder - FAGACEAE

Basionym : Quercus dealbata Hook.f. & Thomson ex Miq.

Synonym : Lithocarpus tapintzensis A.Camus
Lithocarpus viridis Schottky
Pasania dealbata (Hook.f. & Thomson ex Miq.) Oerst.
Synaedrys dealbata (Hook.f. & Thomson ex Miq.) Koidz.

Common name : Oak

English   Lao   

Botanical descriptions Habitat and ecology Distribution

Botanical descriptions :

Diagnostic characters : Bark slightly fissured, bark fibres penetrating into the wood. Flowers unisexual on the same plant, male in spike-like catkins, female, sessile, densely clustered on lateral or subtermial spikes. Fruit an acorn, cupule covering 1/2 to 2/3 of the acorn, with a few hairs at the top.
Habit : Evergreen tree up to 30 m high, 45-100 cm in diameter. Branches ascending to the main trunk.
Trunk & bark : Trunk straight. Bark smooth, slightly fissured, light brown or grey to dark brown, inner bark yellowish.
Branches and branchlets or twigs : Twigs terete, brown, glabrous.
Exudates : Exudate absent.
Leaves : Leaves simple alternate and spiral, 14-18 by 6-7.5 cm, oblong or elliptic-oblong or oboblong, apex obtuse, acuminate, base acute or attenuate, margin entire, blade leathery to coriaceous, young leaves abaxially pubescent with short hairs, becoming glabrous on both sides when mature.
Midrib canaliculated above, primary vein single, secondary veins oblique to the midrib, widely parallel, tertiary veins oblique. Petiole long and glabrous.
Inflorescences or flowers : Inflorescence rachis tawny tomentose with short hairs. Flowers unisexual on the same plant, male flowers grouped in spike-like catkins at apex of twigs, female, sessile, densely clustered on lateral or subtermial spikes.
Fruits : Fruitescence in very dense spike, cupule sessile with connate bracts, often united by 3 to 5 and enveloped at 1/2 to 2/3, generally bracts triangular, appressed and imbricate, a few spreading, young fruit greenish. Fruit is an acorn 1.9-2.0 by 1-1.8 cm, depressed globose to subglobose, or turbinately pyriforme.
Seeds : Seed 1.

Habitat and ecology :

In mixed forest usually in association with other species of Fagaceae family. Flowering : September to December; fruiting: April to November of the following year.

Distribution :

Bhutan, Burma (Myanmar), China, India (Type), Thailand (Northern, Northern-astern and South-western), Vietnam and Laos (Khammouane, Saravane and Xiengkhouang provinces).

Remark/notes/uses :
Wood hard and difficult to work but sometimes used for construction work. Fruits edible.

Specimens studied :
BT 194 (Herbarium of Faculty of Sciences-NUoL, NHN-Leiden and CIRAD-Montpellier).

Literature :
Flore Générale de l’Indochine. 1929. Vol.5, Fasc. 8-10. Muséum National d'Histoire Naturelle, Laboratoire de Phanérogamie, Paris, France.
Chamlong Phengklai et al.. 1984. Fagaceae of Thailand. BRT, The Thai Response to Biodiversity.
Huang Chengjiu, Zhang Yongtian & Bruce Bartholomew. 1999. Flora of China, Vol. 4. Missouri Botanical Garden Press ( St.Louis).
Lehmann L., M. Greijmans and D. Shenman. 2003. Forests and trees of the central highlands of Xieng Khouang Lao PDR, A field guide. Lao Tree Seed Project, Vientiane, Laos.
Chamlong Phengklai. 2006. Thai Forest Bulletin, no 34. Bangkok, The Forest Herbarium.

Top of the page