Tree up to 30 m. tall; trunk up to 2 m. diam., often buttressed; branchlet-pubescence fulvous. Lvs thick, coriac., rigid; 6-15 × 5-15 mm., on petioles 2-3 mm. long; lamina glab. except on veins below, broad-to deltoid-ovate to suborbicular, doubly crenate, cuneate at base; venation rather obscure; fringed domatia 1-2 in basal vein-axils. Staminate infls 1-4 per branchlet; peduncles 2-3 mm. long, sparsely pubescent, with 1 terminal fl. Per. 5-6 mm. diam., of 2 unequal lobes, each again 2-3-partite. Stamens 30-36; anthers 2-3 mm. long, red above, greenish below, or stramineous. Pistillate infls 1-4 per branchlet, 3-2-fld, on short densely pubescent peduncles. Lateral fls trimerous, terminal dimerous or aborted; stigmas ligulate. Cupule 6-7 mm. long, 4-segmented, with 4-5 rows of gland-tipped processes, subtended by 2 foliaceous bracts. Nuts puberulous, 5 mm. long; lateral triquetrous, 3-winged; terminal flat, 2-winged; wings produced above, gland-tipped.

n = 13

n = 13

2n = 26 or 28