Japan Flora: Stems 5-15 cm. long; stolons elongate after anthesis; radical leaves often persistent at anthesis, long-petiolate, broadly ovate, 1-2.5 cm. long, 0.8-2 cm. wide, with incurved teeth; leaves of stolons ovate-orbicu¬lar to ovate-elliptic, 5-40 mm. long, 4-35 mm. wide; flowers rather numerous, yellow-green; calyx-lobes nearly erect at anthesis, elliptic, 1-1.8 mm. long; stamens longer than the calyx-lobes, 2-3 mm. long, the anthers yellow; capsules as¬cending, the valves unequal; seeds about 0.8 mm. long, longi¬tudinally ribbed with a series of clavate tubercles on the ribs. Mar.-May.

Honshu (Kanto Distr. and westw.), Shikoku, Kyushu.

Var. atrandrum Hara. Flowers with dark-colored anthers. Occurs with the typical phase.

Var. shiobarense (Franch.) Hara. Radical leaves usually withering before anthesis; stolons much-elongate at anthe¬sis, with smaller, orbicular leaves; anthers red-purple, rarely yellow. Apr-May.

Honshu (Kanto Distr. and westw.), Shikoku, Kyushu.