Tree, up to 25 m high, 60 cm diam. Leaves elliptic to oblong, 5-8-nerved, ca 6-12 by 4½-7½ cm, with rounded to obtuse or slightly emarginate apex, rounded to obtuse base, and slightly undulate to dentate margin, glabrous. Petiole 1½-4 cm long, with linear-lanceolate, 1-2 mm broad wings; wings with rounded or auriculiform apex, caducous. Inflorescence a 2-flowered raceme, less often flowers solitary; axis 1½-4 cm long. Flowers ca 9 cm diam. Sepals 5, elliptic, ca 22 by 15 mm. Petals yellow, ca 45 by 29 mm. Stamens in 2 distinct groups, the outer ones ca 155, 9-10 mm long, straight in bud, the inner ones ca 20, 13-15 mm long, with their apex reflexed in bud. Carpels (5-)7-9, glabrous to sparsely shortly hirsute, mainly in the apical part, ca 9 by 2½ mm, with ca 15 mm long styles. Cell-wall inside the apical part and wall of the stylar canal hirsute. Each carpel with 9-11 ovules. Fruit dehiscent, the sepals enlarged to ca 28 by 20 mm. Carpels 18 by 16 mm, showing the hirsuteness inside the apical part. Seeds unknown.
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