Aporosa falcifera Hook.f., Fl. Brit. India 5 (1887)
Latin for 'sickle-shaped', referring to the stipules.
Aporusa acuminatissima Merr.
Aporusa hosei Merr.
Aporusa merrilliana Govaerts & Radcl.
Mid-canopy tree up to 33 m tall and 47 cm dbh. Stipules ca. 15 mm long,
curved. Leaves alternate, simple, penni-veined, glabrous. Flowers ca. 1 mm in
diameter, yellowish, placed in compacted racemes. Fruits ca. 12 mm long, red,
dehiscent capsule, seeds with aril.
Tree, up to 30(-33) m high, up to 40(-47) cm diameter. Bark black to grey brown, smooth, flaky,
fissured, sometimes lenticelled, not peeling, 1 mm thick; inner bark red to whitish, soft, 2.5 mm
thick. Wood pale brown, reddish to yellowish, or white. Twigs grey, (sparsely) puberulous. Stipules
falcate, 4-9 by 11-18 mm, present in young stages, black disc-like glands along margin beneath,
puberulous at base beneath, glabrescent. Petiole terete, smooth, 9-17 by 1-1.5 mm, sparsely
puberulous, lower pulvinus 2-2.5 by c. 2 mm, upper pulvinus 2-6 by 1.5-2.5 mm, both distinct.
Leaves narrowly elliptic, sometimes linear elliptic, 8-25 by 2.5-7 cm; base subcordate to rounded,
basal glands absent; margin subentire to lowly undulate, marginal glands regular, small, blackish,
indistinct, in margin; apex acuminate; blade thickish, smooth, shiny, not brittle, drying bluish
green above, golden brownish beneath, glabrous above, midrib and nerves sparsely puberulous beneath;
dots irregularly set, fine, greyish, fading; disc-like glands regular to many, along margin, black,
mostly distinct. Nervation: midrib slightly prominent to flat above, prominent beneath; nerves
10-14 pairs, slightly prominent to flat above, prominent beneath, marginal arches distinct to
slightly fading, 1-3 mm from the margin; tertiary veins and venation fading, densely reticulate,
slightly scalariform, flat above, slightly prominent to flat beneath. Inflorescences axillary or
just below the leaves. Staminate inflorescences 2-5 clustered together, 8-16 by 2-3 mm, puberulous;
peduncle 1-4 by 0.5-1 mm; bracts ovate, inconspicuous, 0.7-0.9 mm long, hairy outside, glabrous
inside; glomerules indistinct, ellipsoid, consisting of 9-13 densely set flowers, spaced
continuously along apical part of the rachis; pedicel minute. Staminate flowers 1-2 mm long; sepals
4 or 5, obovate, 0.3-0.6 mm long, connate to halfway, sparsely hairy outside, glabrous inside;
stamens 2 (or 3), strongly exserted, 1-1.8 mm long; anthers 0.1-0.2 mm long, connective glabrous;
pistillode often indistinct. Pistillate inflorescences 2 or 3 clustered together, 7-15 by 0.8-1 mm,
puberulous, flowers up to 11, densely set at apical 3/4th of rachis; bracts broadly triangular,
0.2-0.3 mm long, sparsely hairy outside, glabrous inside; bracteoles ovate, 0.1-0.2 mm long,
sparsely hairy outside, glabrous inside; pedicel c. 1 mm long, sericeous. Pistillate flowers
2-2.5 mm long; sepals 4 or 5, ovate, patent, 0.5-0.7 mm long, thin, sparsely hairy outside,
glabrous inside; ovary ellipsoid, 2-2.5 mm long, 3-locular, smooth, sericeous at base, glabrescent
towards apex or subglabrous; stigmas sessile, elongated, flattened to the sides of the ovary,
apically bifid to near base, straight, 2-2.5 mm long, lowly longitudinally ribbed above, glabrous,
beneath smooth, glabrous, style remnant absent. Infructescences 9-25 by 1-1.5 mm, sericeous;
fruiting pedicel 2-5 mm long, sericeous. Fruits ovoid, not stiped, not beaked, 9-15 by 6-12 mm,
punctulate to smooth, drying dark to greyish brown, sparsely hairy, glabrescent; pericarp 0.3-0.8 mm
thick, not fleshy; septae and column glabrous. Seeds 3, half-terete, ellipsoid, 5-6 by 3-4 by 2-3 mm.
[from Flora Malesiana: http://www.nationaalherbarium.nl/Euphorbs/specA/AporosaT.htm]
Primary forest; low undulating land; on ridges, slopes, and along river banks. Soil: sandy loam,
rich, dark or greyish, also on limestone. Altitude: 5-1400 m.
Peninsular Thailand, Peninsular Malaysia, Sumatra, Borneo, Northern Sulawesi.
Borneo: Biling, Damak-damak, Kayu dusun, Tambau, Untapulu.
Peninsular Malaysia: Pisang-pisang.