Shrubs or small trees, 5–6 m tall, branches stout, rough, 10–15 mm in diam. below inflorescence, usually gray-brown tomentose. Petiole flattened, winged, 10–20 mm; leaf blade leathery, obovate-elliptic or obovate-lanceolate, 20–28 × 7–14 cm; base cuneate, decurrent to winged; apex obtuse, apiculate; abaxial surface with brownish, 2-layered, indumentum, upper layer agglutinated, patchy, hairs cup-shaped, lower layer grayish, thin and compacted; adaxial surface green, glabrous, midrib and lateral veins raised abaxially, flat adaxially; lateral veins 12–17-paired. Inflorescence 12–17-flowered; rachis stout, 15–20 mm, tomentose. Pedicel ca. 3 cm, brownish tomentose; calyx ca. 1 mm, tomentose; corolla obliquely campanulate, pale yellow, with a purple basal blotch, 3.5–4.5 cm; lobes 8, suborbicular, ca. 1.5 × 2 cm, emarginate; stamens 16, 1.5–2.5 cm, filaments pubescent at base; ovary ovoid, ca. 10 × 5–7 mm, densely tomentose; style ca. 3.5 cm, glabrous. Capsule curved, ca. 25 × 10 mm.
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