Aporosa subcaudata Merr., Philip. J. Sci. 11, Bot. (1916)

Latin for 'slightly pointed'.

Aporosa Bracteosa Pax & K.Hoffm.

Understorey tree up to 18(-30) m tall and 30 cm dbh. Stipules ca. 6 mm long, curved. Leaves alternate, simple, penni-veined, hairy. Flowers ca. 0.3 mm in diameter, yellowish, placed in racemes. Fruits ca. 8 mm long, yellow-orange-red, dehiscent capsule, seeds with orange aril.

Tree, up to 30 m high, up to 25(-30) cm diameter. Bark (dark, pale, or reddish) brown, or dark green to (light) grey, smooth, slightly ?ssured, flaking; inner bark dark or pale brown to reddish or pinkish, yellowish, or whitish, scaly. Wood light brown, reddish, orange, or yellow to whitish. Young branches brown, tomentose. Stipules (narrowly) ovate, 5-6 by 1.5-3 mm, sparsely sericeous, present in young stages. Petiole terete, adaxially lowly grooved, 5-13 by 1-2 mm, densely hirsute, glabrescent, lower pulvinus c. 2 by 2 mm, indistinct, upper pulvinus 2.5-4 by 2-3 mm, distinct. Leaves narrowly elliptic to narrowly obovate, 7-26 by 2-7.5 cm; base obtuse to cuneate, basal glands absent; margin lowly undulate to subentire, marginal glands many, in margin, small, black; apex cuspidate to caudate; blade thinnish, smooth, dull, not brittle, drying greyish green to almost black above, (light) brown beneath, only midrib and nerves tomentose above, glabrescent, sparsely tomentose beneath, midrib and nerves tomentose, glabrescent; dots laxly set, greyish, fading in older leaves; disc-like glands absent. Nervation: midrib flat to raised in a furrow above, prominent beneath; nerves 8-15 pairs, flat to slightly sunken above, prominent beneath, marginal arches distinct, 0.5-2 mm from margin; tertiary veins and venation often distinct, (slightly) scalariform, flat above, prominent beneath. Inflorescences axillary or just below the leaves. Staminate inflorescences 1-7 clustered together, 9-23 by 1-2 mm, sericeous to tomentose; peduncle 2-4 by c. 1 mm; bracts broadly triangular, 0.5-1.5 mm long, inconspicuous, densely hairy outside, glabrous inside; glomerules subglobose, 1-2.5 by 1-1.5 mm, spaced at 0.5-1.5 mm at base of rachis, decreasing to 0 at apex; pedicel minute. Staminate flowers 0.3-0.5 mm long; sepals 4, narrowly obovate, 0.3-1 mm long, connate at base only, hairy outside, glabrous inside; stamens 2, not to slightly exserted, 0.3-0.6 mm; anthers 0.1-0.2 mm long, connective glabrous; pistillode a minute lump. Pistillate inflorescences 1-3 clustered together, 2-9 by 1.5-2 mm, sericeous; flowers up to 13, densely arranged along the rachis; bracts broadly triangular, 0.3-0.6 mm long, sericeous outside, glabrous inside; bracteoles ovate, 0.2-0.3 mm long, sericeous outside, glabrous inside; pedicel absent. Pistillate flowers 1.5-2.2 mm long; sepals 4, ovate, patent, 0.5-1.2 mm long, hairy outside, hairy at base only inside, margin ciliate; ovary ellipsoid, 1.2-2 mm long, 2-locular, densely sericeous; stigmas sessile, elongated, completely divided, flattened to the sides of the ovary, straight, 1.2-1.5 mm long, densely laciniate above, glabrous, smooth beneath, sericeous, style remnant absent. Infructescences 3-15 by 1.5-2.5 mm, sericeous; fruiting pedicel 0.5-1 mm long. Fruits ellipsoid, occasionally globose, 8-12 by 4-6(-10) mm, not stiped, not beaked, punctate, (sparsely) sericeous; pericarp 0.5-1 mm thick, not fleshy; septae and column glabrous. Seeds 1 (or 2), half-terete, ovoid, 6-8 by 4-5 by 2-4 mm. [from Flora Malesiana: http://www.nationaalherbarium.nl/Euphorbs/specA/AporosaT.htm]

Primary, secondary, disturbed, logged forests; flat or low undulating country; on ridges, hill sides, hill tops, (steep) slopes, valleys, near riverbanks. Soil: clay, sandy clay, sandy loam, or sandstone, yellow or red. Altitude: 10-1200 m.

Peninsular Malaysia, Sumatra, Borneo.

Local names
Borneo Janggau, Kayu massam, Kelinganham, Legong, Murok, Obah, Penatan.
Peninsular Malaysia Kaum tebasa, sebasah (Malay).