Tree, up to 15 m high and 35 cm diam. Leaves ovate or elliptic-oblong, ca 15-18-nerved, 10-20 by 4½-10 cm, with acute, often slightly acuminate, less often obtuse apex, rounded to acute base, and nearly entire to slightly dentate margin, glabrous. Petiole ca 16-20 mm long, with broad half-obcor-date wings; wings ca 16-18 by 13-15 mm, with entire margin, glabrous, caducous. Flowers solitary, terminal, ca 6-8 cm diam. Sepals approximately circular, 2-2½ cm diam., glabrous. Petals yellow, 4 by 3½ cm. Stamens ca 165, the outermost ones ca 7½ mm long, straight in bud, the innermost ones ca 12 mm long, with the apex reflexed in bud, with intermediate lengths. Carpels 6-9, ca 7 by 2½ mm, with 7 mm long styles; each with 8 ovules. Fruit indehiscent, pale green, slightly depressed-globular, ca 32 mm diam., 26 mm high. Carpels very slightly spirally twisted, ca 15 by 12 mm, 1-seeded. Seeds ca 5 by 4 mm, very finely densely echinate, enclosed by a 10 mm long, rather fleshy aril.
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