双喙虎耳草 shuang hui hu er cao

Micranthes birostris (Engler & Irmscher) Losinskaja; M. davidii (Franchet) Losinskaja; M. leptarrhenifolia (Engler & Irmscher) Losinskaja; S. birostris Engler & Irmscher; S. leptarrhenifolia Engler & Irmscher.

Stem 7.5-30 cm tall, crisped glandular villous. Petiole ca. 1.5 cm, margin villous; leaf blade obovate, 2.5-8.5 × 1.5-4 cm, glandular pubescent, pinniveined, base cuneate, margin crenate to dentate-serrate, apex obtuse. Inflorescence paniculate, elongate, 7-30-flowered; branches to 4.5 cm, glandular pubescent; pedicels ca. 8 mm, glandular pubescent. Sepals reflexed, subtriangular to ovate, ca. 2 × 1.1-1.2 mm, glabrous, veins 3, confluent into a verruca, apex subobtuse or acute. Petals white, with a yellow spot at base, elliptic to ovate, 3.2-3.6 × 1.3-1.6 mm, 3- or 4-veined, base with a claw 0.2-0.3 mm, apex obtuse or retuse. Stamens ca. 2.3 mm; filaments clavate; anthers brown. Carpels subsuperior to superior, united only at base, conical, with a basal, narrow, annular nectary; stigmas subsessile; follicles widely divergent, bottle-shaped, ventrally convex, 5-9 mm. Fl. Apr-May.

Rock crevices in ravines; 1500-2400 m. W Sichuan [N Myanmar].