Japan Flora: Promi­nently pubescent with multicellular long whitish hairs; rhi­zomes short-creeping; stems erect, often slightly purplish red, 30-40 cm. long, sometimes slightly branched, rather stout, 4- angled; lower leaves spathulate or scalelike, small, deciduous, the middle one ovate to broadly so, 3-8 cm. long, 2-4.5 cm. wide, subacute, broadly cuneate at base, with few irregular coarse teeth, the petioles 5-10 mm. long, winged in upper part; bracts narrowly ovate, obtuse, often purplish red, longer than the calyx; verticils dense, forming a terminal cylindrical spike; flowers blue-purple, the tube 10-12 mm. long, the upper lip 1-1.5 mm. long, 2-lobed; nutlets about 2 mm. long. May-June.

Hokkaido, Honshu, Kyushu.