Nephelium maingayi Hiern, in Hook.f. Fl. Br. Ind. 1 (1875)

Synonyms
Nephelium lappaceum var. maingayi (Hiern) Valet.

Diagnostics
Mid-canopy tree up to 33(-40) m tall and 60(-90) cm dbh. Stipules absent. Leaves alternate, compound, leaflets penni-veined, glabrous, venation strongly reticulate. Flowers ca. 2 mm diameter, green-yellow, placed in panicles. Fruits ca. 22 mm long, green-pink-red, drupes. Seeds with white aril.

Description
Tree, up to 40 m high, dbh up to 90 cm, sometimes with up to 1.4 m high buttresses. Twigs 2- 7.5 mm in diam., glabrous. Leaves 1-foliolate to 3(-5)-jugate; petiole 1-10 cm long, 1-3 mm thick, terete to semiterete; axes early glabrescent or sometimes glabrous; petiolules 4-17.5 mm long, above grooved, no ribs. Leaflets +/- elliptic to obovate, 5.8-22 by 2.8-9 cm, index 1.5-3.5, pergamentaceous, glabrous or beneath sometimes very sparsely hairy on midrib and nerves; domatia absent; base rounded to acute, mostly attenuate; sides curved; apex without or with an obtuse to acute acumen; midrib above sunken to prominulous, nerves 0.5-2.5 cm apart, above slightly grooved to prominulous, no intercalated veins, veins and veinlets coarsely reticulate, prominulous on both sides. Inflorescences axillary to terminal. Sepals from less than halfway to nearly completely connate, 1-1.3 mm long. Petals absent. Disc hairy or glabrous. Stamens 4-6. Ovary 1-celled, style lateral, with 1 stigma. Fruits with a 2-3 mm long stipe, the body +/- flattened-ellipsoid. 2-2.8 by 1.3-1.8 by 1- 1.3 cm, style remnant a small point or hook just above the stipe, the surface variably warty, slightly puberulous around and especially beneath the style remnant, for the rest glabrous; wall coriaceous. 1-1.5 mm thick. [from Flora Malesiana]

Ecology
In undisturbed mixed dipterocarp, (peat)-swamp and sub-montane forests up to 1600 m altitude. Mainly in alluvial (swamps) sites and along rivers and streams.

Uses
The wood is used. The fruits are edible.

Distribution
Peninsular Malaysia, Sumatra, Borneo.

Local names
Borneo: Buah serait, Duku, Katiau, Mujau, Puda, Serait.