Japan Flora: Thinly pubescent stolonifer­ous perennial; stems 7-15 cm. long, few-leaved at base; leaves obovate, elliptic, or broadly ovate, 4-7 cm. long inclusive of the petiole, 1-1.5 cm. wide, very obtuse, undulately obtuse­ toothed, the petioles winged in upper part; leaves of stolons short-petiolate, sometimes ovate-orbicular, 1.5-25 cm. long; racemes loosely few-flowered, puberulent, the pedicels longer than the calyx; calyx 7-10 mm. long, 5-lobed; corolla slightly flattened dorsiventrally, the lobes of the bilobed upper lip nar­rowly oblong, the lower lip inside with 2 raised lines of yellow- brown clavate tubercles; capsules subglobose, about 4 mm. long. Apr.-May. Wet places, especially abundant around paddy fields in lowlands.

Honshu, Shikoku, Kyushu.   

f. albifiorus (Makino) Makino. White-flowered phase.

var. contractus Makino.  Leaves strongly in­curved and bullate, very numerous on the stems. Possibly of garden origin.