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Shrub or small tree 3–15 m high; trunk 5–30 cm in diameter; bark pale brown, shallowly to deeply fissured, with large lenticels. Leaves petiolate; blade narrowly elliptic, 4–27 cm long, 1.5–10(–12) cm wide, obtusely acuminate, acute or obtuse at the apex, cuneate at the base; petiole 3–15 mm long. Inflorescence 5–23 cm long,many-flowered, glabrous in all parts; peduncle 2–15 cm long; pedicels 3–10 mm long. Flowers with sepals suborbicular or broadly ovate, 3.5–6 mm long, glabrous outside, ciliate, with a single row of colleters within; corolla white, with a pale yellow throat and greenish tube; mature bud forming a broadly ovoid head; tube almost cylindrical, 10–30 mm long, twisted just above the base; lobes spreading, later recurved, obliquely elliptic, mostly clearly falcate, 14–32 mm long, 5.5–16 mm wide, rounded, auriculate at the left side of the base, undulate; stamens barely exserted or with apex up to 14 mm below the mouth of the corolla tube, inserted 6–8 mm above the corolla base; pistil 7–10 mm long, glabrous; style 2.5–5.3 mm long; ovary almost cylindrical to broadly ovoid; ovules 70–100 in each carpel. Fruits dark green, obliquely ellipsoid, 6–7(–10) cm long, 4.5–5(–10) cm in diameter, rounded, with 2 faint lateral ridges, smooth or slightly verrucose, dehiscent, several-seeded; pericarp 7–13 mm thick; pulp white; aril orange; seed dark brown, ± coffee-bean-like, obliquely ellipsoid, 11–23 mm long.