Aglaia rivularis

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Aglaia rivularis

Description

Small tree up to 15 m. Bark smooth, brown or whitish- brown; inner surface of bark brown; middle bark reddish-brown; inner bark reddish- brown or pale brown, cambium pink or yellowish–brown; sap wood pink or almost white. Leaves simple, 6.5–24 by 1–4 cm, lanceolate, tapering to an acuminate apex, tapering to a cuneate base; with numerous or densely covered with scales like those on the twigs on the midrib below, few on the rest of the lower leaflet surface, sometimes numerous when young; veins 10–17, reticula- tion visible or occasionally subprominent below; petiole 1–2 cm, densely covered with scales like those on the twigs. Inflorescences up to 6 in the axils of the leaves of the api- cal shoots, 12–23 cm long, 6–12 cm wide; peduncle 2.5–4.5 cm, peduncle, rachis and branches densely covered with scales like those on the twigs, or with a longer fimbriate margin. Male and female flowers similar, 1–2 mm long, 1.5–2.5 mm wide; pedicel 0.5–3.5 mm, densely covered with peltate scales which have a fimbriate margin. Petals 5 (or 6). Staminal tube 1–1.3 mm long, 0.9–1.5 mm wide, thickened inside below the bases of the anthers, aperture 0.5–0.7 mm, margin lobed; anthers 5, c. 0.3 mm long and wide, ovoid, inserted inside the margin of the tube, protruding through the aperture and pointing towards the centre of the flower. Fruits 1.5 cm long, 0.8–1 cm wide, ellipsoid, brown, reddish- brown or yellow; fruit-stalks up to 0.8 cm; pericarp reddish–brown, indehiscent. Seed 1, surrounded by an aril.

Distribution

Asia-Tropical, E Borneo present
Malesia: E Borneo.

Morphology

Aglaia rivularis resembles A. yzermannii, except that it has simple leaves.

Uses

Wood is used for fence posts (Borneo: Dusun Labuk). The arils are edible.

Citation

Pannell 1992 – In: Kew Bull., Add. Ser. 247.
Steenis 1981: Rheophytes: 291. t. 32