Japan Flora: Green, glabrescent perennial with slender branched rhizomes; stems 5-15 cm. long, angled, glabrous to spreading glandular- hairy often on the upper part; leaves membranous, ovate-del­toid, 2-3 cm. long, 1.5-2.5 cm. wide, subobtuse, truncate or very broadly cuneate at base, often scattered hairy, few-toothed, the petioles 1.5-2.5 cm. long; spikes loosely flowered, 1-5 cm. long, nearly glabrous; calyx 2 mm. long in anthesis, 4 mm. long in fruit, with long spreading hairs; corolla white, green­ish yellow when dried, 7-8 mm. long, the lower lip descend­ing, 2.5 mm. long, about twice as long as the suberect upper lip; nutlets about 05 mm. long, densely mammillate. July-Aug.

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

f. pubicaulis Ohwi. Plant rather prominently puberulent on upper part of stems. Kyushu.