Oaks of the World

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  Quercus sumatrana
Author Soepadmo 1966
Synonyms  
Local names  
Range Sumatra, Borneo ; to 1300 m;
Growth habit more than 30 metres tall; trunk to 1.3 m in diameter; 
Leaves 10-22 cm x 3-7; chartaceous; elliptic or lanceolate; base acute, attenuate; apex acute; margin plane, remotely serrulate on apical half; glabrous, pale grey brown adaxially; glaucous, sparsely pubescent beneath with stiff, simple hairs; 8-13 vein pairs parallel, distantly spaced, prominent below and slightly so above, forming an angle of 45-60° with the midrib; petiole thin, 1-2 cm long, flat obove, sparsely tomentose;
Flowers  
Fruits acorn ovoid to conical, 2-2.5 cm long, silky, glabrescent, with depressed apex and flat or impressed basal scar; cupule saucer-shaped with thick wall, tomentose, with 4-6 denticulate rings,  covering 1/6 to 1/5 of fruit; from April to December;

Bark, twigs and
buds

bark grey; twig initially densely pubescent, glabrescent, smooth, with lenticels; terminal buds ovoid to subglobulose, 2-3 mm long; stipules linear, 5-7 mm long, densely fulvous tomentose;
Hardiness zone, habitat not hardy;
Miscellaneous -- Subgenus Cyclobalanopsis
-- Section Oidocarpa, sub-section Oidocarpae (Menitsky).
-- rare; only herbarium specimens are studied;
Subspecies and
varieties
 
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