Anisoptera marginata Korth.

Young twig, leaf bud, stipule outside (glabrous within), midrib beneath and petiole shortly caducous pubescent; panicle persistently so. Twig terete, becoming angular on drying, smooth or with very fine striation. Bud 2.3-3.5 by 2 mm, ovoid, acute, compressed. Stipule c. 8 mm long, linear, obtuse. Leaf 7-10 by 3.5-4.5 rpm, oblong to ± obovate, densely golden-brown lepidote beneath, bullate in young trees, otherwise applanate, with obtuse or broadly cuneate base; acumen to 6 mm long; nerves 10-14 pairs, slender, at c. 65-70° to the midrib; petiole 1.5-2 cm long, slender. Panicle to 14 cm long, terminal or axillary, lax, pendent, terete; irregularly doubly branched. Flower bud to 8 by 3.5 mm, lanceolate, acute. Calyx cupped at base; lobes subequal, narrowly deltoid, the 3 outer slightly narrower, acute, the 2 inner obtuse. Corolla pale yellow; petals broadly elliptic, fimbriate. Stamens c. 25; filaments short, slender; anther oblong; appendage to connective c. 2 times length of anther, reaching apex of stylopodium. Stylopodium cylindrical, shortly densely tomentose; style short, tapering, stout at base, the basal half tomentose, otherwise glabrous, trifurcate. Fruit calyx shortly pubescent; tube c. 1.3 cm ø, globose, to 8 mm ø at the neck; 2 longer calyx lobes to 12 by 2 cm, spatulate, obtuse; 3 shorter lobes 1.5-2 cm long, c. 3 mm broad at base, linear, acute; apex of nut almost flat, tapering abruptly to the c. 3 mm long, c. 1.5 mm ø oblong stylopodium.

An emergent tree in undisturbed forests with poor soils, at elevations up to 1,000 metres. Mostly found in alluvial sites (peat swamp, freshwater swamp), but occasionally on ridges in mixed dipterocarp or keranga forest.

Can be grown by seedlings.