Nephelium uncinatum Radlk. ex Leenh., Blumea 31 (1986)

Diagnostics
Mid-canopy tree up to 40 m tall and 63 cm dbh. Stipules absent. Leaves alternate, compound, leaflets penni-veined, glabrous, whitish below. Flowers ca. 2 mm diameter, yellowish, placed in panicles. Fruits ca. 19 mm long, red, spiny drupes.

Description
Tree, up to 25(-40?) m high, dbh up to 45(-63) cm, with up to 1.5 m high buttresses. Twigs 2.5-4.5 mm in diam., puberulous, late glabrescent. Leaves (1-foliolate to) 3-7(-9, rarely up to 18)-jugate; petiole 3-9 cm long, 1-1.5 mm thick, terete; axes densely minutely hairy, rarely fully glabrescent; petiolules (1-)2-4 mm long, above broadly shallowly grooved with a strong median rib. Leaflets (narrowly) elliptic to obovate, sometimes slightly falcate, 4.8-11 by 1.5-3.5 cm, index 2.5-5(-6), pergamentaceous, above puberulous in the basal part of the midrib, to subglabrous, beneath sparsely hairy on midrib and nerves, in between minutely sericeous; domatia present; base acute, decurrent; sides slightly curved; apex tapering to fairly abruptly acuminate, acumen short (to long), broad, obtuse (to acute); midrib above raised, nerves 3-8 mm apart, nearly patent, above prominulous, intercalated veins well developed, veins and veinlets clearly different, coarsely reticulate, prominulous but rather inconspicuous on both sides. Inflorescences terminal or pseudoterminal and in the upper leaf axils. Sepals c. 25-50 percent connate, in male flowers 1-1.1 mm, in female ones 1.4-1.5 mm long. Petals absent. Disc in male flowers fairly strongly developed, the lobes protruding between the stamens, in female flowers less conspicuous, glabrous or with some hairs. Stamens 5 or 6. Ovary 2-celled, sometimes in the same specimen also 1-celled. Fruits ellipsoid to subglobular, 2.75-3 by 2-2.25 cm, glabrous, fairly sparsely set with thick warts tapering into or more abruptly terminated by an up to 7.5 mm long, filiform, curved appendage; wall coriaceous, 1-2 mm thick.

Ecology
In undisturbed to slightly disturbed (open sites) mixed dipterocarp and swamp forests up to 400 m altitude. Mostly on hillsides and ridges on sandy well drained soils.

Uses
The fruits are edible.

Distribution
Peninsular Malaysia, Sumatra, Borneo.

Local names
Borneo: Kalamangis, Keranji, Kolomangis, Lamun, Lamun-lamun, Lenamun, Rambutan, Ulomangis.