Shorea mujongensis Ashton, Gard. Bull. Sing. 22 (1967)

Diagnostics
Emergent tree up to 82 m tall and 217 cm dbh. Stem with resin. Stipules dropped early. Leaves alternate, simple, penni-veined, glabrous. Flowers ca. 11 mm in diameter, yellow-pink, placed in panicles. Fruits ca. 13 mm long, reddish, with 3-5 ca 50 mm long wings, wind dispersed.

Description
Tall buttressed tree. Young twig, bud and petiole shortly buff pubescent, glabrescent. Twig c. 2 mm diameter apically, terete, rugulose; stipule unknown. Leaves 6-14 by 2.5-5.5 cm, ovate or elliptic, margin +/- revolute, base obtuse to cuneate; acumen to 8 mm long; nerves 8-13 pairs, slender but prominent beneath, curved, at c. 50 degrees; tertiary nerves scalariform, unraised, narrowly channelled, beneath; midrib applanate above, prominently terete beneath; petiole 10-16 mm long, terete. Flowers ca. 11 mm in diameter, yellow-pink. Panicle to 6 cm long, singly branched, terete, rugulose, shortly evenly buff puberulent. Flower bud to 6 by 4 mm, fusiform. Perianth puberulent on parts exposed in bud; sepals ovate, subacute. Stamens 15, in 3 unequal verticils; filaments broad at base, tapering; anthers ellipsoid; appendages same length as anthers, slender, glabrous. Ovary and stylopodium pyriform, puberulent except at apex, surmounted by a short glabrous style. Fruit pedicel to 2 mm long, puberulent. Fruit calyx sparsely puberulent to glabrescent; 3 longer lobes to 7 by 1.5 cm, spatulate, obtuse, 4 mm wide above the 6 by 5 mm tuberculate incrassate base; 2 shorter lobes to 4.5 by 0.7 cm, otherwise similar. Nut to 2.2 by 0.7 cm, narrowly ovoid, densely shortly pale buff pubescent. [from Flora Malesiana]

Ecology
In undisturbed mixed dipterocarp forests up to 1100 m altitude. On hillsides and ridges. On fertile soils.

Uses
The timber is used.

Distribution
Borneo.

Local names
Borneo: Selangan kuning, Seraya kuning.