Epimedium dolichostemon

Description. Herbs 30 - 50 cm tall. Rhizome compact. Leaves basal or cauline, trifoliolate; leaflets narrowly ovate or lanceolate, 8 - 10 x 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 x 1.2 - 2.5 mm, apex obtuse, inner pair ovate, 4 - 5.5 x 2.8 - 3.5 mm, apex obtuse. Inner sepals white, narrowly elliptic or lanceolate, 8 - 14 x 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.