Large tree. Young twig and petiole densely caducous puberulent; leaf nervation beneath sparsely so, bud persistently so, stipule outside sparsely persistently so. Twig c. 3 by 2 mm ø apically, somewhat compressed, becoming terete, smooth to rugulose; stipule scars horizontal, broad, pale, prominent. Bud to 7 by 4 mm, ellipsoid, compressed, acute. Stipule to 12 by 6 mm, elliptic, obtuse. Leaves 8-15 by 5.5-10.5 cm, oblong to obovate; base typically cordate, sometimes obtuse; apex obtuse, retuse or abruptly to 8 mm long acuminate; nerves 15-18 pairs, prominent beneath, at 30°-40°; tertiary nerves slender, densely scalariform, set diagonally to nerves; midrib depressed above, prominent beneath; petiole 12-25 mm long, terete, frequently rugulose. Panicle to 12 cm long, terminal or axillary, lax, compressed or ribbed; singly branched, branchlets to 5 cm long, bearing to 5 ± secund flowers; bracts to 10 by 3 mm, lanceolate, acute, puberulent, fugaceous; bracteoles to 10 by 5 mm, elliptic, obtuse, not at first caducous. Flower bud to 10 by 5 mm, fusiform. Calyx sericeous outside, glabrous within; lobes narrowly deltoid-lanceolate, narrowly obtuse, the 3 outer somewhat longer than the 2 inner. Petals oblong-lanceolate, sericeous outside, glabrous within. Stamens 15, in 3 unequal verticils or with the outer vestigal and devoid of anthers; filaments longer than anther, narrow, compressed, tapering; anthers elliptic-oblong; appendage to connective to 6 times as long as anther, filiform, tapering somewhat shorter than style apex. Ovary ovoid, glabrous; style columnar, c. 2 x length of ovary, tapering, sericeous in the basal 1/3, obscurely trifurcate apically. Fruit glabrous. Pedicel obscure, tapering into the base of the fruit. 3 longer calyx lobes to 13 by 2.5 cm, lorate, obtuse, c. 8 mm broad above the c. 12 by 12 mm orbicular saccate thickened base; 2 shorter lobes to 6.5 by 0.8 cm, narowly lanceolate, acute, similar at base. Nut to 14 by 10 mm, globose, closely and completely enveloped by the calyx; style remnant c. 4 mm long.
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