Anisoptera costata Korth.

Twig of variable thickness, at first frequently angular, becoming minutely striated or smooth, terete. Bud 3-5 by 1.5-3 mm, ovoid, somewhat compressed, acute. Stipule c. 8 by 3 mm, hastate, acute, fugaceous. Leaves 6-18 by 7-11 cm, thinly coriaceous, frequently slightly bullate, oblong to obovate, undersurface grey-green lepidote to golden or chocolate; base obtuse or broadly cuneate; acumen to 5 mm long; margin not revolute or only slightly so; nerves 8-22 pairs, at 60°-70°; petiole 2-4 cm long. Panicle to 20 cm long, terminal or axillary, angular, pendent, doubly or trebly branched, branchlets bearing up to 5 flowers; bracteoles to 4 by 2 mm, hastate, acute, shortly densely pubescent. Flower bud to 12 by 6 mm, ovoid, acute. Calyx densely tomentose outside, shortly pubescent within; lobes deltoid, ± acute, acuminate, of varying lengths. Corolla cream; petals broadly hastate, acute, shortly puberulent on parts exposed in bud. Stamens c. 25 (to 35 outside Malesia), subequal; filaments short, compressed; anther oblong, tapering apically; appendage to connective about twice as long as anther, filiform, tapering, reaching almost to apex of stylopodium. Stylopodium cylindrical, somewhat tapering, densely pubescent; style short, trifid, pubescent at base, otherwise glabrous. Fruit calyx shortly pubescent, tube glabrescent; tube to 1 by 1.2 cm, globose, tapering gradually to the pedicel, narrowed to 8 mm ø at the neck; 2 longer calyx lobes to 16 by 1.5-2 cm, spatulate, obtuse, c. 5 mm broad at base; 3 shorter lobes to 20 by 4 mm, variable, hastate, base slightly constricted. Nut apex broadly conical, crowned by a c. 2.5 by 1.5 mm oblong stylopodium, shortly pubescent.

A canopy tree in semi-evergreen dipterocarp; evergreen, and humid lowland forest. Evergreen or open and degraded forests at elevations up to 500 metres. Often found along the banks of rivers or streams.

Can be grown by seedlings. Seeds needs soaking.