Small tree, ca 5 m high. Leaves subcoriaceous, elliptic to oblong, ca 6-12-nerved, 6-15 by 3-7 cm, with rounded to slightly emarginate apex, rounded base, and entire to slightly undulate margin, glossy. Petiole ½-1 cm long. Raceme terminal, later lateral, leaf-opposed, with only one flower at the same time, up to 40 cm long with 30 scars of fallen flowers; axis more or less zig-zag. Flowers 6-8 cm diam. Sepals 5, elliptic, 15-18 by 10-14 mm. Petals yellow, 4-5 by 3-4 cm. Stamens in 2 distinct groups, the outer ones ca 120, 8 mm long, straight in bud, the inner ones ca 50, 14-20 mm long, with their apex reflexed in bud; on the outside often a few staminodes, 7 mm long. Carpels 7-8, ca 8 by 2½ mm, with 10 mm long styles, each with ca 16 ovules. Fruit dehiscent, the sepals pink, enlarged to ca 25 by 15 mm. Carpels 17 by 14 mm, 1-2-seeded. Seeds ovoid, 3 by 2 mm, enclosed by a membranaceous, up to 5 mm long aril.
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