Tree, up to 25 m, 16 cm dbh. Petiole (1.5-)4-6.5 mm. Leaf-blade (ovate-)oblong, (3—)7—17 by (l-)2.8-7 cm, apex acuminate to cuspidate; above dark reddish brown to dark olive-green, midrib slightly prominent to flat, or sunken in basal part; beneath concolorous, secondary nerves 5-7 pairs, forming a rather indistinct intramarginal nerve; glands 0-8, situated in middle and apical part, (0.1-)0.2-0.4 mm diam. Inflorescences (much) shorter than the leaves; axes lanate; flowers solitary or in basal part with up to 3 together. Pedicel (1.5—)3—4 mm, dark, sparsely lanate. Sepals black when dry; outer sepals (3-)4-5.5 by (1.5—)2.5—3.5 mm; inner sepals (3.5-)6-7 by (1.5—)2.5—4 mm. Petals subequal, 9.5-12 mm long, white, the upper ones with a yellow spot, when dry nearly black, cil-iate to apex, inside hairy above insertion of filaments. Stamens 8(—10); filaments connate over c. 5-6 mm, glabrous at base, upwards densely (woolly) hairy; anthers 0.5-0.65 mm long, glabrous to sparsely woolly hairy at base. Ovary stipitate for 2.5-3 cm, dark, glabrous or with a few rather long hairs; style glabrous to rather sparsely lanate; ovules 12-18 (-23). Fruit ellipsoid, up to 11 by 6 cm, attenuate at base and apex, often more or less smooth, orange to dark brown; pericarp rather soft, c. 0.5 mm thick. Seeds 8 or more, like those of 74. X. papuanum, but albumen forming a thin layer along outer side of the cotyledons.
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A tree. It grows to about 20 m tall. The leaves are alternate and simple. The flowers are 13 mm across. They are white to yellow. The fruit are about 7 cm across. They are green to yellow. They contain many seeds.
Undisturbed to slightly disturbed (open) mixed dipterocarp and sub-montane forests up to 1,300 metres. On hillsides and ridges, but also along rivers and streams. On clay soils. In secondary forests usually present as a pre-disturbance remnant.
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It is a tropical plant. It grows in mixed forest up to 1300 m above a level. It can be on hillsides or along rivers. It grows on clay soils. It grows in Borneo.
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