Description from Flora of China
Herbs annual. Stems 24-40 cm tall, erect, 0.8-1.5 mm in diam., base purplish, subglabrous to densely pubescent. Petiole (0.3-)0.5-2 cm, base purplish; leaf blade ovate to triangular-ovate, 1.4-1.7 × 1.2-3.5 cm, herbaceous to membranous, base truncate to subrounded, margin shallowly obtuse dentate to incised dentate, apex acute to rounded. Racemes terminal, 4.5-11.5 cm; bracts minute, narrowly lanceolate, 3-7 × 1-2 mm, margin entire; lower bracts leaflike, longer, sparsely pubescent. Pedicel ca. 2.5 mm, densely antrorse white pubescent. Calyx ca. 3 mm, to 4 mm in fruit, pilose along veins or spreading glandular pubescent or densely pubescent; scutellum ca. 1.5 mm, to 4 mm in fruit. Corolla blue-purple, (1-)1.7-2.5 cm, glandular pubescent outside, glabrous inside, base slightly bent in front, throat to 5 mm wide; middle lobe of lower lip broadly ovate, slightly constricted at middle, apex emarginate; lateral lobes ovate. Nutlets chestnut or dark brown, ovoid, ca. 1 mm in diam., tuberculate, adaxially umbonate at base Fl. Jun-Aug, fr. Jul-Oct.
Stony and grassy slopes, wet valleys, forests, wet forested meadows; 100-2600 m. Anhui, Fujian, Hebei, Heilongjiang, Henan, Hubei, Jiangsu, Jiangxi, Jilin, Nei Mongol, Shaanxi, Shandong, Sichuan, Zhejiang [Japan, Korea, Russia]