Baccaurea sumatrana (Miq.) Mull.Arg., in DC. Prodr. 15, 2 (1866)

Latin for 'from Sumatra'.

Baccaurea bivalvis Merr.
Baccaurea kingii Gage
Calyptroon sumatranum Miq.

Tree (4-)15-22 m high, dbh (5-)15-35 cm, buttresses if present up to 1 m high, c. 6 cm thick; branches glabrous, young shoots dark brown to black, Terminalia branching pattern well-developed. Indumentum of simple hairs. Bark greyish-brown to brown to black, 2-16 mm thick, smooth to rather rough, hard, glabrous, peeling off with longitu-dinal flakes of c. 1 cm long, raised glands present, (exudate watery, red); inner bark white to red brown to pink, 1.5-2 mm thick, glabrous, hard, scaly. Heartwood reddish to dark brown. Leaves: petiole 5-48 mm long, glabrous; stipules 1-7 by c. 1 mm, sparsely hairy on both sides, densely hairy at midrib outside, margin not ciliate; lamina ovate to sometimes obovate, 3-19 by 1.2-7.5 cm, l/w ratio 1.1-2.9(-3.75), papery; base attenuate to cuneate (to rounded); apex obtuse to acuminate, up to 18 mm long; upper surface glabrous, rarely granulate, a few discoid glands rarely present; lower surface glabrous, a few discoid glands present; green to red when dry, red when young; secondary veins, 5-8(-10) per side, sometimes closed at margin; nervation reticulate. Staminate inflorescences axillary to somewhat ramiflorous, solitary (to 3 clustered together), up to 2.3(-5.4) cm long, densely hairy, 30-75-flowered, flowers grouped at upper part of inflorescence; branchlets spatulate, 2-3.8 mm long, densely hairy, with (2 or) 3 (or 4) flowers; bracts 1 per branchlet, c. 1 mm long, glabrous outside. Staminate flowers sessile, 0.9-1.8 mm diam., yellow-green; sepals 3-5, each with a different size and shape, 0.3-1.2 by 0.3-1 mm, glabrous; stamens 4-6, 0.4-1 mm long, glabrous; ?laments 0.4-0.9 mm long; anthers 0.1-0.15 mm; pistillode ligulate, up to 0.5 mm high, densely hairy. Pistillate inflorescences axillary to ramiflorous, solitary (to 4 clustered together), 0.7-6.5(-9) cm long, 1-2 mm thick, densely hairy except at base, 2-20-flowered; pedicel geniculate (90กใ bent) at the abscission zone, 2.2-2.5 mm long, upper part c. 1.2 mm, densely hairy; bracts absent. Pistillate flowers 1.5-2 mm; sepals 4 or 5, ovate to obovate, each with a different size and shape, 0.5-1.3 by 0.5-1.4 mm, densely hairy on both sides; ovary cylindrical, 1.8-2.5 by 1-1.4 mm, 2-locular, sparsely hairy to velutinous; style absent or up to 0.1 mm long; stigmas not lobed to apically lobed up to the base, lobes up to 0.5 mm long, glabrous. Fruits ellipsoid, laterally flattened, usually 1-seeded, fleshy capsules, 9-17 by 4-10 mm, dehiscing loculicidally, outside subglabrous, inside glabrous, septa rarely sparsely hairy, yellow to orange to reddish; pedicel straight, 2-8 mm long, upper part 0.5-2 mm; pericarp c. 1 mm thick; column often persistent, 6-12 mm long, curved, flattened; sepals persistent, small. Seeds ellipsoid, laterally flattened, 6-9 by 4-7.5 by 2-4 mm; arillode orange; testa red; cotyledons 3.5-6 by 4-6.5 mm, thin; radicle up to 0.8 mm long. [from Flora Malesiana]

In undisturbed to slightly disturbed mixed dipterocarp to sub-montane forests, and sometimes in keranga forest up to 1600 m altitude. Mostly on hillsides and ridges with sandy to clay soils, sometimes also on limestone.

The timber is used.

Peninsular Thailand, Peninsular Malaysia, Sumatra, Java, Borneo.

Local names
Borneo Bidu-bidu, Kayu masam, Kelibon, Perepat, Puak purut, Puak ukang, Sangkurat.
Peninsular Malaysia Tampoi.
Sumatra Ketjipot, semasam, semasam pris. Bangka: Masput (Malay). Simeulue Island: Toetoen bolawak iteung pajo, toetoen bolawah kehe-pajo.