Koompassia grandiflora

Author: Kostermans

Morphological description grandifl Koompassia compl FM38
Giant tree up to 37(-50) m high; bole straight, smooth and cylindric, 1(-1.2) m in diameter; butresses up to 0.75-5 m high, 3 m wide and 10 cm thick; branchlets glabrous or slightly pubescent. Stipules lanceolate, 1-2 mm long, puberulous outside.

Leaves (3-)7-9(-13)-foliolate; rachis 8-10 cm, slightly and minutely puberulous, glabrescent; petiole 1-4 cm; petiolules short, 2.5-3.5 mm, densely minutely puberulous. Leaflets alternate, rather thin, chartaceous, elliptic, ovate-lanceolate, more or less symmetrical, (2.5-)4.5-8(-10.5) by (1-)1.5-3.5 cm; base usually rounded; apex acute or acuminate, glabrous, glossy above, loosely minutely pubescent beneath.

Inflorescences sometimes branched at the base and appearing as 2 together, 3-6(-10) cm long; rachis pubescent, loosely flowered; pedicels 8-10 mm. Calyx lobes lanceolate, 7-10 mm long, slightly puberulous outside. Petals creamy green or orange-yellow, lanceolate, 8-11 by 2 mm, acute or acuminate at the apex. Stamens 7-8 mm long; filaments slender, c. 2.5 mm, glabrous; anthers large, lanceolate, 5-6 mm long, usually hairy on the inner side, sharply and conspicuously apiculate. Ovary elliptic-lanceolate, c. 4 mm long, hairy at the basal part and along the margins, the apical part narrowed into the glabrous style (up to 9 mm) and indistinct stigma.

Pods greenish brown, obovate-oblong, oblong, 9-15 by 2.5-5 cm (incl. the broad wing), the basal part not twisted, glabrous, veined (grandiflora Koompas pod/fl BJ ).

Seeds brown, very flat, broadly ovate, c. 3.5 by 2.5 cm.

Malesia: New Guinea: Irian Jaya (Vogelkop), Papua New Guinea (Morobe, Gulf and Central Provinces).

Habitat & Ecology
Primary rain forest, coastal plain foothills, stony low hill, loamsoil or sandy loamsoil, up to 840 m altitude. Flowering in October; fruiting in July and September.

The timber is used for cabinet making, flooring and general construction work (Verdcourt, 1979: 57). The timber is suitable for structural usage, when treated with wood preservatives also outdoors. See Wan Razali & Sudo (1993: 270-275).