Shrub to 5 m high. Shoots and branchlets appressed-pubescent, glabrescent. Leaves: petiole 2.5–3 mm long; lamina lanceolate to oblanceolate, 5–14 cm long, 1.5–4 cm wide, obtuse, rounded or broadly acute at base, acuminate at apex, glabrous above, sparsely appressed-pubescent, glabrescent below; secondary veins 12–18 pairs. Flowers solitary, axillary. Pedicel 3–4 mm long; bracts ovate, 1.5–2.5 mm long. Sepals broadly ovate or triangular, 4–4.5 mm long, 3 mm wide, acuminate or acute, appressed-pubescent outside. Petals pale brownish yellow. Outer petals very narrowly ovate-attenuate, 30–45 mm long, 5–5.5 mm wide, pubescent. Inner petals nearly linear, 30–48 mm long, 3.5–4 mm wide, pubescent, grooved, glabrous and sometimes pink at base inside. Stamens 35–45, 1.5–2 mm long. Carpels 5; ovary 1.5 mm long; ovules 5 or 6. Apocarps obloid, to 4.5 cm long, 2 cm wide, warted, glabrous; stipe to 5 mm long. Seeds 2–5.
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