Shrubs, 1–2 m tall; old branches grayish white, glabrous; young shoots greenish, sparsely glandular-hairy. Petiole terete, adaxially flat, grooved, 10–15 mm, glabrous, abaxially conspicuously glandular hairy; leaf blade leathery, oblong-elliptic to obovate, 6–10 × 2–4.5 cm; base cordate; apex mucronate; abaxial surface indumentum persistent, thin, olivaceous or brownish yellow; adaxial surface green, densely rugulose, glabrous or hairy on midrib; midrib prominent abaxially, impressed adaxially; lateral veins 12–14-paired, slightly raised abaxially, slightly impressed adaxially. Inflorescence racemose-umbellate, 4–8-flowered; rachis ca. 5 mm, pilose. Pedicel slender, 1.5–2.5 cm, densely glandular-hairy; calyx membranous, lobes 5, 4–5(–9) mm, ovate to oblong, outer surface and margin with glandular hairs; corolla campanulate, white to cream, base with deep red spots, 2.5–3.5 cm, lobes 5, suborbicular, ca. 1.5 × 1.5–2 cm, apex emarginate; stamens 10, unequal, 1.5–2.5 cm, filaments pubescent at base; anthers ovate; ovary ovate, ca. 4 mm, glandular hairy; style ca. 2 cm, as long as corolla, base with slightly glandular hairs, stigma slightly expanded. Capsule cylindric, curved, ca. 20 × 4 mm. Fl. May–Jun, fr. Aug–Sep.
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