Japan Flora: Stems tufted, rather stout, erect, short­ascending at the base, nearly glabrous or long-pilose on the nodes; leaves triangular to ovate-cordate or broadly ovate,

5-10 cm. long, 3-8 cm. wide, obtuse to short caudate, shal­lowly cordate to rounded at base, loosely pubescent above and on nerves beneath, petiolate; verticils loose; flowers dense, white to pinkish, 3-4 cm. long; calyx 13-18 mm. long, 5- toothed, the teeth obliquely spreading, linear-filiform, ciliate, gradually broadened at base; corolla-tube slightly curved up­ward near base, the upper lip of corolla arcuate, white-pubes­cent externally, the lower lip reflexed, the midlobe large, the lateral ones with a linear appendage; anther locules bearded; nutlets cuneate-obovate, about 3 mm. long, acutely 3-angled, truncate at apex. Apr.-June. Thickets and thin woods especially along streams in lowlands to high mountains.

Hok­kaido, Honshu, Shikoku, Kyushu; common. s. Kuriles, Sakhalin, Korea, China, and Manchuria. The typical phase occurs from Eurasia to N. Africa.