Shrub or tree, up to 27 m high, to 90 cm ø, often buttressed (90 cm high, 135 cm out, 5 cm ø). Leaves trifoliolate, papyraceous to subcoriaceous, ovate-to elliptic-oblong to-lanceolate, glabrous, acute to caudate, base acute to truncate, venation not very conspicuous; nerves 1-5 pairs, usually ± prominent, veinlets not as finely reticulate as in S. griffithii; lateral leaflets 3-9 ½ by 1-3¾ cm, terminal ones 5½-18 by 2-6¾ cm; petiole 6-25 by 1-2½ mm, rachis (5-)9-27 by ¾-2mm; petiolules 4-7 by ¾-2 mm. Panicles shorter than subtending leaf, 1-4 together, loosely branched, 1-8½ (-13½) cm, ferrugineous-puberulous, gla-brescent; branches flattened, 2-30(-40) mm long; bract or petioloid ovate, acute, up to 7 mm. Pedicels: lower joint 2½-5 mm, upper 1-3 mm; Calyx 3-5 mm high, outside pale puberulous to glabrous, purplish, ± caducous in fruit. Sepals 2¼-5 by 1¼-3 mm, broadly ovate to oblong, acute to emarginate. Petals 7-11 by 2-5 mm, obovate-oblong to-lanceolate, rounded to emarginate, 1-2 mm clawed, lilac or pink to scarlet or red. Filaments in SF 2¾-3½ and 3¼-4½ mm, in LF 1½-2¼ and 2¼-3 mm, the longer occasionally without anthers. Pistil pale puberulous to glabrous, in SF 1¼-2½ mm, in LF 3½-5 mm; styles in SF 0.25-1 mm, in LF 2½-4; ovary 1-2 by ¾-1 ¼ mm, ellipsoid. Fruit white to greenish when fresh (red when dry), ellipsoid, glabrous, 16-31 by 9-20 mm; rimae inconspicuous. Seeds 7½ by 5 mm, testa smooth; cotyledons 4 ⅔ by 4 mm, radicle 1 ⅓-1¾ by 4/5 mm.
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A tree. It grows to 30 m high. The trunk is 90 cm across. The trunk is fluted and the buttresses are 2 m high. The bark is reddish brown. The leaves are arranged in spirals. They are papery to thinly leathery. They are oval or sword shaped. There are side leaflets 3-9.5 cm long by 1-4 cm wide with end leaflets 5.5-18 cm long by 2-7 cm wide. The tip has a long point. The base tapers narrowly. There are 1-5 pairs of secondary veins. The stalks of the leaflets are 4-7 mm long. They are jointed. The flowering cluster is made up of 1-4 loosely branched panicles. They are 13.5 cm long. The flowers are pink to red. The fruit are greenish yellow. They are 16-31 mm long by 9-20 mm wide.
First and second storey of primary and secondary forest on wet, well-drained, poor soil (e.g. podsolized sand) on undulating to flat land, up to 900 m.
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A tropical plant. It grows in the tropical lowland forest and up to 900 m above sea level.
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