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Tree to 30 m high. Shoots and branchlets appressed-pubescent, glabrescent. Leaves: petiole 2-4 mm long; lamina lanceolate or oblanceolate, 4-22 cm long, 2.5-6 cm wide, obtuse or rounded at base, acute or acuminate at apex, glabrescent; secondary veins mostly 6-9 pairs. Flowers solitary or paired; pedicel 5-15 mm long, pubescent. Sepals ovate, 4-5 mm long, 2 mm wide, acuminate, pubescent. Outer petals narrowly ovate to oblong, 5-6 mm long, 1-1.5 mm wide, acute, pubescent, green. Inner petals lanceolate, broadly saccate, twisted near tip, 30-42 mm long, 12-18 mm wide, puberulous outside and inside near tip; margins recurved; base with short 2.5-3 mm wide claw, green with streaks of red outside, densely mottled red inside with a medial pink stripe. Stamens c. 48, 1.2-1.3 mm long, incurved. Carpels c. 23; ovary 1.5 mm long; ovules 2-10. Apocarps ellipsoidal or subglobular, 15-35 mm long, 15-20 mm wide; stipe 10-20 mm long. Seeds 2-5.
