恩施淫羊藿 en shi yin yang huo

Herbs, 25-70 cm tall. Rhizome shortly creeping, nodes many. Leaves basal and cauline, usually trifoliolate, rarely basal leaves simple; leaflets abaxially glaucous, slightly pruinose, adaxially dark green, ovate or broadly ovate, 3.2-9.5 × 2.5-6 cm, leathery, abaxially glabrous or sparsely white pubescent, adaxially glabrous, base cordate with lobes rounded, base of terminal leaflet with subequal lobes rounded, those of lateral leaflets slightly unequal, rounded or obtuse, margin remotely spinose-serrate, apex acuminate or shortly acuminate. Flowering stem with 2 trifoliolate opposite leaves. Inflorescence simple, racemose, 10-20-flowered, 14-33 cm, glandular. Flowers large, 1.5-2.5 cm in diam. Outer sepals 4, pale brown, outer pair ovate-orbicular, ca. 1.5 mm, inner pair ovate, ca. 2.5 × 1.5 mm; inner sepals pale yellow, ovate, 6-7 × 3.2-3.7 mm, apically acute. Petal spur pale yellow, horn-shaped, longer than inner sepals, 7-12 mm, base lamina-less. Stamens slightly prolonged, ca. 3 mm; anther ca. 2 mm, valved. Capsules 1-1.4 cm; style ca. 5 mm. Seeds 10. Fl. Apr-May, fr. May-Jun.

● Slopes; ca. 400 m. Hubei (Enshi).