Tree, up to 20 m high, 50 cm diam., with light brown heartwood. Leaves oblong to elliptic-oblong, ca 10-16-nerved, 10-25 by 5-15 cm, with acute to rounded apex and base and entire to slightly dentate margin. Petiole 1½-6 cm long, with 4-7 mm broad wings; wings narrowing towards the base of the blade, caducous. Raceme 1-6-flowered, up to 30 cm long. Flowers 6½-9 cm diam. Sepals 5, the outer 2 elliptic to circular, 15 by 12-15 mm, the inner 3 obovate, 20-30 by 15-18 mm. Petals deep lemon yellow, 40-50 by 25-30 mm. Stamens in 2 distinct groups, the outer ones ca 250-300, 6.5-8 mm long, straight in bud, the inner ones ca 23-35, 11-14 mm long, with their apex reflexed in bud; on the outside often a number of staminodes (up to 25). Carpels 8-10, red, 6-7 by 1½-2 mm, with 9-11 mm long styles, each with ca 6-12 ovules. Fruit dehiscent, when ripe with carmine red sepals enlarged to 30-40 by 17-20 mm. Carpels 15 by 10 mm, 1-seeded. Seeds 4 by 3½ mm, enclosed by a membranaceous aril.
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