四川淫羊藿 si chuan yin yang huo

Herbs, 15-60 cm tall. Rhizome long creeping, 1-4 mm in diam., with internodes to 14 cm. Leaves basal and cauline, trifoliolate; leaflets adaxially green, ovate or narrowly ovate, 5-13 × 2-5 cm, thinly leathery, abaxially glaucous, papillose, sparsely gray pubescent, reticulate veins conspicuous, adaxially glabrous, base deeply cordate, terminal leaflet with equal rounded lobes, lateral leaflets conspicuously oblique with outer lobe large and acute, inner lobe smaller and rounded, apex long acuminate. Flowering stem with 2 trifoliolate opposite leaves. Inflorescence simple, racemose, 4-10-flowered, 8-15 cm, glandular. Pedicel 1.5-2.5 cm, glandular. Flowers rose or mauve-purple, 3-4 cm in diam. Outer sepals 4, outer pair ovate, ca. 3 mm, apex rounded, inner pair broadly obovate, ca. 4 mm; inner sepals reflexed, narrowly lanceolate, 1.5-1.7 cm × ca. 3 mm, apex long acuminate. Petals reflexed, pale purplish red, spur horn-shaped, ca. as long as inner sepals or slightly longer, 1.5-2 cm, lamina-less. Stamens prolonged, 4-5 mm; filaments 1-2 mm; anthers 3-4 mm, valved. Capsules 1.5-2 cm; style rostrate. Fl. Mar-Apr, fr. May-Jun.

● Forests, thickets, grasslands, streamsides; 400-1900 m. Guizhou, Hubei, Sichuan.