Description from Flora of China
Corylopsis platypetala var. levis Rehder & E. H. Wilson.
Shrubs, to 2.5 m tall; young branches sometimes glandular pubescent, older growth gray-brown, glabrescent, lenticellate; buds glabrous. Stipules oblong or oblong-lanceolate, 20–30 mm, apex acute, abaxially glabrous, adaxially villous; petiole 12–15 mm, sometimes glandular pubescent; leaf blade ovate or broadly ovate, 7–10 × 4–7 cm, villous on both surfaces, glabrescent, base symmetrical or asymmetrical, cordate, margin serrate, teeth mucronate, apex short acute; lateral veins 6–10 on each side, the 2 lowermost with tertiary veins. Inflorescence 2–2.5 cm, 8–20-flowered; peduncle 1.5–2 cm, subglabrous; basal bracts of inflorescences caducous; floral bracts oblong, 4–5 mm, sparsely pubescent; bracteoles caducous. Floral cup glabrous. Sepals ovate, glabrous, apex obtuse. Petals axelike, 3–4 × ca. 4 mm, base shortly clawed. Stamens somewhat shorter than petals; disk scales not lobed, shorter than sepals. Ovary semi-inferior, glabrous; styles shorter than stamens. Capsules 7–9 mm, glabrous. Seeds 4–5 mm. Fl. Apr–Jul, fr. Jul–Sep.
Montane forests; 1300--2600 m. Anhui, Hubei, Sichuan.