Epimedium membranaceum K. I. Mey.

Herbs 20–65 cm tall. Rhizome compact or elongated. Leaves basal or cauline, trifoliolate; leaflets broadly ovate or narrowly ovate, 4–6 × 2–3 cm, apex acute or acuminate, margin with spines 1–1.5 mm, base cordate with lobes rounded or acute, those of lateral leaflets conspicuously oblique, subleathery, adaxially glabrous, abaxially glaucous, with scattered minute erect hairs. Flowering stem with 2 opposite or alternate leaves. Inflorescence paniculate, 9–40 cm long, 5–35-flowered, glandular; pedicels 1.5–2 cm. Flowers yellow, 4–6 cm in diam. Outer sepals green with base purplish. Inner sepals red, ovate-elliptic or narrowly ovate, 6–7 × 2.5–3 cm, apex acute. Petals pale yellow, much longer than inner sepals, subulate, 1.5–3.5 cm, lamina-less base. Stamens ca. 4 mm; anthers ca. 3 mm, yellow. Capsules ca. 2.5 cm.