Description from Flora of China
Herbs perennial. Rhizomes white, moniliform with tuberlike internodes to 6 mm in diam., stoloniferous. Stems purplish, erect, (12-)20-36 cm tall, glabrous except for white pilose nodes. Petiole 1.5-4 mm, white pilose on margin of groove of abaxial side, glabrous abaxially; leaf blade ovate to ovate-oblong, 0.8-2.3 cm × 3-13 mm, adaxially glabrous or sparsely white pilose, abaxially purplish, sparsely pilose on veins otherwise densely glandular, base rounded to shallowly cordate, margin 3-7-crenate, apex acute to obtuse. Racemes poorly defined, terminal; bracteoles linear, inserted on basal 1/3 of pedicels in pairs. Flowers few, axillary. Pedicel ca. 4 mm, sparsely pubescent. Calyx 3(-4) mm, glabrous or slightly puberulent, white pilose along margin, slightly enlarged, to 5 mm in fruit; scutellum ca. 1 mm, ca. 1.5 mm in fruit. Corolla blue, ca. 3.2 cm, puberulent outside, white villous on conjunctive parts of upper lip and lateral lobes of lower lip inside; tube saccate in front at base, ca. 2 mm wide at middle, gradually dilated to 8 mm wide at throat; middle lobe of lower lip subcircular, to 1 cm wide, apex emarginate; lateral lobes ovate, ca. 2.5 mm wide, apex emarginate. Nutlets brownish, ellipsoid, ca. 1 × 0.75 mm, tuberculate. Fl. Jul-Aug, fr. Aug-Sep.
Gravelly springsides, grassy places, marshes; ca. 1000 m. Jilin [Korea, Russia].