Japan Flora: Stems 20- 40 cm. long, tuberlike and decumbent at base, then erect, 4-angled, green, with scattered white recurved hairs; leaves membranous, ovate or rhombic-ovate, 2-4 cm. long, 1-2.2 cm. wide, acute at apex, broadly cuneate at base, coarsely toothed, thinly pilose above and on nerves beneath, the petioles 1-2 cm. long; racemes terminal, short-pedunculate, 4-10 cm. long, loosely flowered, recurved white*puberulent, the bracts linear, 1-3(-5) mm. long, the pedicels spreading, 5-7 mm. long; calyx 2.5 mm. long at anthesis, 6-7 mm. long and deflexed in fruit, lobes of lower lip obscurely spine-tipped, longer than the upper lip, the upper lip with 3 short teeth; corolla white, 5-6 mm. long, about 4 mm. across; nutlets narrowly elliptic, slightly compressed, 1.7 mm. long. Aug.-Dec.

Honshu (w. Tokaido and Kinki Distr.), Shikoku, Kyushu. Ryukyus.