Asarum nanchuanense C. S. Yang & J. L. Wu ex C. Y. Cheng & C. S. Yang

Herbs. Rhizomes vertical, 3-4 mm in diam., internodes less than 1 cm. Leaves solitary; petiole 2.5-7.5 cm, glabrous; leaf blade abaxially reddish purple, glossy, rarely green, adaxially green with white blotches along veins, cordate or ovate-cordate, 5-7.5 × 6-8.5 cm, abaxial surface glabrous, adaxial surface pubescent along lateral veins, base cordate, lateral lobes divaricate, 2-2.5 × ca. 3.5 cm, apex acute; cataphylls broadly ovate, ca. 2 × 1.8 cm. Flowers usually paired. Peduncle ascending, ca. 1.5 cm. Calyx purplish, urceolate-rotate, 3-4 × 2.5-3 cm; sepals connate beyond attachment to ovary, abaxially glabrous; tube cylindric, 2-2.5 × ca. 2 cm, slightly constricted at throat, adaxially longitudinally 10-ribbed, orifice ring inconspicuous or absent; lobes broadly ovate, ca. 1.5 × 1.5 cm, base with small pulvinate area and scattered papillae. Stamens 12; filaments much shorter than anthers; connectives slightly extended beyond anthers, awl-shaped. Ovary half-inferior. Styles free, apex notched; stigmas lateral. Fl. May.

* Thickets, rock crevices. Chongqing.