Epimedium dolichostemon Stearn

Herbs 30–50 cm tall. Rhizome compact. Leaves basal or cauline, trifoliolate; leaflets narrowly ovate or lanceolate, 8–10 × 3–4.5 cm, apex long acuminate, margin spinous-serrate with the spines 0.5–1.5 mm, base deeply cordate with lobes acute or rounded, those of lateral leaflets very oblique, leathery, adaxially glabrous or pubescent, abaxially glaucous, glabrous or pubescent. Flowering stem with 2 opposite or rarely alternate leaves. Inflorescence paniculate, 15–20 cm long, 35–70-flowered, glabrous or glandular pubescent; pedicels 1–3 cm. Flowers ca. 2 cm in diam. with spreading inner sepals. Outer sepals purplish with margin white, outer pair ovate-oblong, 3.5–4.5 × 1.2–2.5 mm, apex obtuse, inner pair ovate, 4–5.5 × 2.8–3.5 mm, apex obtuse. Inner sepals white, narrowly elliptic or lanceolate, 8–14 × 2.5–5.5 mm, apex acuminate. Petals reddish purple, cucullate, much shorter than inner sepals, 3–4 mm, with blunt incurved spur and slight lamina base. Stamens conspicuously prolonged, ca. 8 mm; anthers ca. 2.5 mm; filaments 4.5–5 mm.