Asarum himalaicum var. bhutanicum W. W. Smith.

Herbs sparingly to moderately white pubescent, hairs remaining white when dried. Rhizomes horizontal, 1-2 mm in diam., internodes 3.5-4.5 cm. Leaves solitary (one per module); petiole 10-25 cm, glabrate; leaf blade uniformly colored, cordate or rounded-cordate, 4-8 × 6.5-11 cm, abaxial surface long puberulent, adaxial surface short puberulent, base cordate, lateral lobes 2-4 × 2.5-5 cm, apex shortly acuminate; cataphylls ovate-rounded, 0.5-1 × 0.5-0.7 cm. Peduncle pendent, 3-7 cm. Calyx purplish, subcampanulate, 1-1.5 × 0.8-1.4 cm; sepals free beyond attachment to ovary, abaxially glabrous to white villous, adaxially dark red puberulent; pseudotube subglobose, 0.6-0.8 × 0.8-1.4 cm; lobes reflexed, triangular, 0.3-0.5 mm × 0.6-0.8 cm. Stamens 12, included; filaments ca. 2 × as long as anthers; connectives slightly extended beyond anthers, obconic. Ovary inferior. Styles connate, apex 6-cleft, included; stigmas terminal. Fl. Apr-Jun.

Mixed forests, along streams, moist places; 1300-3100 m. Gansu, Guizhou, W Hubei, Shaanxi, Sichuan, Xizang [Bhutan, India, Nepal, Sikkim].