Japan Flora: Rhi­zomes short; stems 50-80 cm. long, short appressed-strigose, with about 10 leaves near the middle; leaves chartaceous, ob­long to obovate-oblong, 10-20 cm. long, 3-7 cm. wide, short- acuminate, gradually narrowed to the base, sessile, deep green and scabrous above with spotted callosities, pale green and ap- pressed-puberulent beneath, lateral nerves 3-5 pairs, fused to the upper ones at tip; racemes 6-12 cm. long, short appressed- strigose, the bracts linear, absent or present only in a few lower flowers; flowers erect, blue-purple, on very short pedicels; calyx-segments linear-lanceolate to linear; corolla 10-13 mm. long, tubular-campanulate, the lobes semirounded; nutlets gray-white, gradually narrowed from the rounded broad base to a subulate hooked beak, 8-10 mm. long.  May-June. Woods in mountains.

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

f. albiflora (Honda) H.Hara. Flowers white.