Quercus elmeri Merr.

North Borneo; Sumatra; Malaysia; to 1500 m;

reaches 35 m tall and more; trunk to 0,9 m in diameter;

6-14 x 2-5 cm; leathery; oblong, elliptic or lanceolate; apex acuminate; base cuneate, usually asymmetrical; margin plane, remotely denticulate at apical 1/2; brownish green, glabrous, shiny above; abaxially with greyish brown stellate tomentum, late-glabrescent; 7-12 pairs of secondary veins raised below, forming an angle of 60-70° with the midrib; petiole 1-3 cm long, often flat above, glabrescent;

male catkins 1.5-3 mm long, pubescent; male flowers pubescent, with 3-4 lobes and 4-5 stamens; pistillate inflorescences 1-2 cm, densely hairy, with 3-4 flowers; female flowers with 3-4 recurved styles;

acorn 2.5-3 cm, glabrous, shiny brown, conical or cylindrical, with apex depressed and base truncate; enclosed 1/4 by cup; silky cup with thick wall, 4-7 denticulate rings; maturing between September to April;

– A. Camus : tome 1, p. 194, n° 8; – Sub-genus Cerris, Section Cyclobalanopsis; – Section Semiserrata, sub-section Semiserratae ( Menitsky ). – Named after A.D.E. Elmer, 1870–1942, plant collector in Borneo and the Philippines