Herbs perennial. Rhizomes ± woody. Stems ca. 30 cm tall, ascending, rooting at basal nodes, few branched or simple, subglabrous or densely pubescent, purplish. Petiole 0.8-1.2 cm, subglabrous, glandular; leaf blade ovate to ovate-lanceolate, 3-8 × 1.5-3.3 cm, ± leathery, adaxially shiny, abaxially sometimes tinged purple, glabrous to sometimes densely pubescent especially abaxially, dotted, base broadly cuneate, margin 3- or 4-undulate-serrate, apex obtuse to acuminate. Racemes opposite, terminal, 7-17 cm; bracts narrowly rhombic, ca. 2 mm, pubescent. Pedicel ca. 4 mm, densely pubescent. Calyx ca. 3 mm, ca. 4 mm. in fruit, pubescent outside, glandular; scutellum spreading, semicircular, to 2 mm. Corolla blue, ca. 2.5 cm, glandular puberulent outside; tube ca. 2 cm, base bent, throat to 6 mm wide, villous near base inside; upper lip triangular-ovate, ca. 8 mm wide; middle lobe of lower lip subcircular, ca. 4.5 mm in diam., emarginate; lateral lobes ovate, ca. 3 mm wide. Nutlets tuberculate. Fl. Aug-Sep, fr. Oct-Nov.