Shorea patoiensis Ashton, Gard. Bull. Sing. 19 (1962)

Diagnostics
Upper canopy tree up to 43 m tall and 82 cm dbh. Stem with resin. Stipules ca. 8 mm long. Leaves alternate, simple, penni-veined, glabrous. Flowers ca. 9 mm in diameter, white-yellow-pink, placed in panicles. Fruits ca. 18 mm long, green, wingless.

Description
Medium-sized tree. Vegetative parts glabrous but for the fimbriate stipule and bud scales and frequently a white waxy powder on young buds and twigs in mature trees. Twig c. 1 mm apically, slender, much branched in mature trees, terete, smooth or rugulose. Leaf bud c 3 by 1 mm (to 4 by 2 mm in young trees), narrowly ovoid, obtuse with the bud scales conspicuously patent. Stipule c. 8 by 2 mm, glabrous but for margin, oblong, acute. Leaves 5-8 by 2-3.5 cm, ovate, chartaceous, frequently subfalcate; base +/- broadly cuneate, decurrent for up to 1 mm at the petiole insertion; acumen c. 1 cm long, narrow; nerves 7-9 pairs, curved, set obliquely (35-45 degrees), slightly elevated above, slender but prominent beneath; tertiary nerves densely scalariform; petiole 7-10 mm long. Panicle to 9 cm long, terminal or axillary, rather short and compact, slender, terete, shortly persistently pale greyish brown pubescent; singly or doubly branched, branchlets to 1 cm long, bearing to 6 flowers; bracteoles minute, fugaceous. Flower bud to 3.5 by 1.5 mm, lanceolate, acute. Calyx densely reddish brown pubescent; lobes very small, suborbicular, obtuse, the inner 2 somewhat thinner, constricted at the base. Petals bright lemon-yellow, linear, imbricate and forming a cup at the base, twisted and spreading apically. Stamens 15, in inequal verticils; filaments rather short, broad at base, abruptly tapering and filiform distally; anther subglobose; appendage to connective as long as anther, shortly ciliate towards the apex, reaching almost to the style apex. Ovary ovoid, shortly pubescent; stylopodium cylindrical, pubescent; style short, glabrous. Fruit calyx shorter than nut, caducous yellowish buff pubescent, margin persistently fimbriate; lobes 3-5 mm long and broad, subequal, broadly ovate, +/- adpressed to the base of the nut and united at the base to form a c. 5 mm cup. Nut to 15 by 8 mm, small, oblong-ellipsoid, striated, glabrescent at maturity, with a minute style remnant. [from Flora Malesiana]

Ecology
In undisturbed mixed dipterocarp forest up to 1000 m altitude. On hillsides and ridges with sandy to clay soils, also often on limestone. Prefers fertile soils.

Uses
The timber is used.

Distribution
Borneo.

Local names
Borneo: Damar hitam padi, Kahan bato, Lempong, Lun, Malejomit, Njerakat, Seraya kuning, Seraya kuning pinang.