Aporosa antennifera (Airy Shaw) Airy Shaw, Kew Bull., Addit. Ser. 4 (1975)

Synonyms
Aporosa nigropunctata var. antennifera Airy Shaw

Diagnostics
Mid-canopy tree up to 31 m tall and 41(-60) cm dbh. Stipules dropped early. Leaves alternate, simple, penni-veined, glabrous. Flowers ca. 0.5 mm in diameter, yellow, placed in racemes. Fruits ca. 17 mm long, yellow, dehiscent capsule, exposing seed with orange-red aril when open.

Description
Shrub or tree, up to 30 m high, up to 60 cm diameter. Bark dark, reddish, pinkish brown, dark to light grey, with reddish patches, smooth, cracked, or slightly rugose; inner bark dark, reddish to light orangish, or yellowish brown to pale pink, firmly fibrous. Wood yellow to white, hard, finely radially striate. Young branches dark brown sparsely puberulous, hairs brown pilose. Stipules not seen, early caducous. Petiole terete, adaxially lowly grooved, 4-8 by 1-1.2 mm, sparsely puberulous, lower pulvinus 0.7-1 by c. 1 mm, indistinct, upper pulvinus 2-3 by 1-1.2 mm, distinct. Leaves narrowly ovate to narrowly elliptic, 6.5-14 by 2.2-6 cm; base cuneate to slightly attenuate, basal glands absent; margin lowly undulate to irregularly glandular-crenate, marginal glands regular, distinct, blackish, hairy in young leaves; apex cuspidate; blade thinnish, smooth, dull, not brittle, drying (dark) greenish blue above, greyish brown beneath, glabrous above, only midrib and nerves sparsely puberulous beneath; dots irregularly laxly set, very fine, black, often indistinct; disc-like glands absent. Nervation: midrib slightly prominent to flat above, prominent beneath; nerves 4-6 pairs, slightly prominent to flat above, prominent beneath, marginal arches often rather fading, 0.5-1.5 mm from the margin; tertiary veins and venation distinct, densely reticulate, slightly scalariform, flat above, slightly prominent beneath. Inflorescences axillary or just below the leaves. Staminate inflorescences 2-5 clustered together, 9-25 by 1-1.3 mm, sparsely puberulous; peduncle 0.5-2 by 0.2-0.4 mm; bracts broadly triangular, inconspicuous, 0.2-0.3 mm long, sparsely hairy outside, glabrous inside; glomerules subglobose, consisting of 5-8 laxly set flowers, 0.7-1.2 by c. 0.5 mm, spaced at 0.1-1 mm at base of rachis, decreasing to 0 mm at apex; pedicel absent. Staminate flowers 1-1.5 mm long; sepals 4, obovate, connate at base, 0.3-0.5 mm long, sparsely hairy outside, glabrous inside; stamens 2, 1-1.5 mm long, exserted; anthers 0.2-0.3 mm long, connective glabrous; pistillode absent. Pistillate inflorescences 1-3 clustered together, 5-13 by 0.5-1 mm, puberulous; flowers up to 7, laxly set along the rachis; bracts broadly triangular, 0.3-0.5 mm long, very sparsely hairy outside, glabrous inside, ciliate; bracteoles ovate, 0.3-0.4 mm long, glabrous, ciliate; pedicel 1-3 mm long, puberulous. Pistillate flowers 3-4 mm long; sepals 4, ovate, subequal, patent, 0.3-0.8 mm long, thin, sparsely hairy outside, glabrous inside; ovary flask-shaped to slightly fusiform, 2-locular, 3-3.5 mm long, punctulate, sparsely puberulous at base, glabrescent towards apex; stigmas raised, elongated, apically bifid to c. halfway, lobes divided, perpendicular to the sides of the ovary, recurved, 2.5-5.5 mm long, papillate above, glabrous, lowly papillate beneath, style remnant absent. Infructescences 9-23 by 0.8-1 mm, sparsely puberulous; fruiting pedicel 2-4 mm long, sparsely puberulous. Fruits ellipsoid, shortly stiped, beaked, 7-10(-15) by 5-8 mm, punctulate to smooth, sparsely hairy at base, glabrescent; pericarp 0.5-0.8 mm thick, not fleshy; septae and column glabrous. Seeds 1 (or 2), half-terete, ellipsoid, 7-8 by 4-5 by c. 2 mm. [from Flora Malesiana: http://www.nationaalherbarium.nl/Euphorbs/specA/AporosaT.htm]

Ecology
Primary, secondary, or logged dipterocarp forest; on hill sides, ridges, and along rivers. Soil: clay, sandy loam, granitic sand, or basalt, yellow-red brownish or greyish. Altitude: 20-1600 m.

Distribution
Peninsular Malaysia, Sumatra, Borneo.

Local names
Borneo Kasingan tahatung, Kayu masam, Manyi, Pembaras pipit.
Peninsular Malaysia Semasam lanang, Kelat jambu (Malay).
Sumatra Bangka rambei.