Tree up to 30 m high and 60 cm Ø. Bark grey or light brown, smooth or cracked. Leaves subcoriaceous, elliptic-oblong or narrowly elliptic, 5½-23 by 2½-6cm; base cuneate; apex acuminate; nerves 16-30 pairs, rather fine, slightly thicker than the veins, sometimes hardly distinct from them on the lower surface; veins reticulate, distinct on both surfaces; petiole ½-4 cm, convex beneath, concave above. Panicles terminal, sometimes also in the apical leaf axils, pyramidal, up to 27 cm long, crowded at the apex of twigs, densely pubescent when young, glabrescent; lateral branches up to 16 cm long, laxly flowered; floral bracts lanceolate, 3-4 mm long; pedicels ⅓-lf2 mm. Flowers white. Calyx 4(-6)-lobed, lobes ovate-oblong, 2-3 mm long, sparsely puberulous outside. Petals 4 (rarely 5), lanceolate, 3½45-4½ by 1-1½45 mm; ridges 3(-5), c. ½ the length of petals, confluent at the lower 1½-2 mm. Disk short-cupular, ½-l mm high, 1-1½ mm wide, 4-lobed, papillose. Stamens 5, 1 fertile, 2-3 mm; filaments free; anthers broad-ovoid, ½ mm long; staminodes ½45-⅔ mm. Ovary subglobose, c. 1 mm ø; style excentric, 1½-2½ mm. Sterile pistil in ♂ c. ⅓ mm. Drupe (fresh) (BACK. & BAKH. f. l.c.) obliquely subrotund, compressed, 8-9 cm Ø; flesh thin, fibrous. Seed labyrinthine, with testa present in the crevices of the very irregular lobes or folds.
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A tree. It grows 30 m tall. The trunk can be 60 cm across. The leaves are oval and 5-23 cm long by 2-6 cm wide. The flowers are white. The fruit is a flattened round shape and oblique. It is 8-9 cm across. The flesh is thin and fibrous.
River-banks and lowland forest, below 100 m. M. gedebe is a distinct constituent of the so-called 'rapak' type of swamp forest, which is inundated during most of the year. In such forest there is no peat formation. Associates are Gluta renghas, Ficus retusa, Alstonia spathulata, etc. Fl. June-Sept.; fr. Aug., Nov.
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A tropical plant. They grow in the humid tropics. It grows on river banks in lowland rain forest. It grows in lowland evergreen forest and peat swamp forest. It grows up to 100 m above sea level.
On river banks in lowland or swamp forests. Marshy places, temporarily inundated areas, river levees, along marshy lakes, often gregarious; tropical ever wet lowland forest.
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