Epimedium borealiguizhouense S. Z. He & Y. K. Yang

Herbs 40–80 cm tall. Rhizome compact. Leaves basal and cauline, trifoliolate; leaflets lanceolate or narrowly lanceolate, 13–18 × 2.5–4 cm, apex long acuminate, margin spinous-serrate, base shallowly cordate, terminal leaflet with subequal rounded lobes, lateral leaflets much oblique, inner lobes small, rounded or almost truncate, outer lobes larger, triangle, acuminate or acute, leathery, adaxially glabrous, abaxially densely strigose, densely pubescent, lanose, or glabrous. Flowering stem with 2 opposite or rarely 3 alternate leaves. Inflorescence paniculate, 30–40 cm long, many (up to 200) flowered, glabrous. Flowers small, 6–10 mm in diam. Outer sepals purplish, small, soon falling. Inner sepals white, ovate, 3–4 × 1.5–2.2 mm, apex acute. Petals yellow, calceiform, 2.2–3.2 mm. Stamens ca. 4 mm; anthers ca. 2.5 mm; filaments ca. 1.5 mm. Capsules ca. 1 cm.