Smooth-barked tree, up to 17 m high. Leaves subcoriaceous, elliptic-oblong to lanceolate, ca 7-9-nerved, 8-14 by 3½-7 cm, with rounded to obtuse, rarely acute apex, obtuse to acute base, and slightly undulate-dentate margin, glossy. Petiole 5-25 mm long. Flowers solitary, terminal, ca 10 cm diam. Sepals 5, 15-22 by 12-15 mm. Petals yellow, ca 50 by 28 mm. Stamens ca 110, the outer ones from 9 mm long, straight in bud, the inner ones up to 15 mm long, with their apex reflexed in bud, with intermediate lengths. Carpels 4-5, ca 7-8 by 1½ mm, glabrous to sparsely hirsute with 0.2-0.4 mm long, rather rigid hairs, each with 11-16 ovules. Styles 8 mm. Fruit dehiscent, carpels ca 15 by 13 mm.
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