Japan Flora: Nearly glabrous to minutely puberulent, green, slender, perennial; stems erect, sometimes branched, 10- 30 cm. long, acutely 4-angled, puberulent on the angles; leaves narrowly ovate-deltoid or deltoid-larKeolate, 1-2 cm. long, 6-10 mm. wide, obtuse, rounded to shallowly cordate at base, slightly scabrous on margin and on nerves above, with 1 or 2 teeth near base, entire on upper half, the petioles 1-3 mm. long; calyx 1.5 mm. long in anthesis, 2.5-3 mm. long in fruit; corolla white, the lower lip twice as long as the upper, about 1.5 mm. long; nutlets about 0.7 mm. long, densely granular- mammillate. June-Aug.

Hokkaido, Honshu, Shikoku (?), Kyushu. Korea, Manchuria, and e. Siberia.