Japan Flora: Rhizomes slender, creeping; stems 15-25 cm. long, ascend- ing-puberulent especially on the angles; leaves broadly ovate to ovate-cordate, 1-2 cm. long, 公-20 mm. wide, truncate to shal­lowly cordate at base, coarsely obtuse-toothed, puberulent on both sides, the petioles to 2 cm. long; spikes short, few-flow­ered; calyx 2.5-3 mm. long, glandular-pilose; corolla 2-2.5 cm. long, blue-purple, the upper lip about 4 mm. long, galeate, the lower lip spreading, as long as the upper.  May-June.

Hon­shu.