Stoloniferous perennial; stolons to 50 cm long; flowering stems 5–45 cm high, villous, hairs in lateral bands (scattered elsewhere), fine, 1–2 mm long, simple, spreading or recurved. Leaves ovate or broad-ovate, 7–30 mm long, 5–20 mm wide, apex rounded or broad-acute, base truncate to slightly cordate, margins with 3–13 pairs of coarse and irregular obtuse teeth; petiole 2–20 mm long. Racemes lateral, 1.5–8 cm long, to 10-flowered or occasionally flowers solitary; peduncle 0–25 mm long; bracts 3–9 mm long; pedicels 3–30 mm long. Calyx-lobes 6.5–8.5 mm long, 2.5–5 mm wide in fruit, ciliate; corolla 4–6 mm long, pale blue or lilac. Capsule broad-obovate, 2.6–5.8 mm long, 2–5.5 mm wide, emarginate, margin with dense fine erect hairs especially towards apex; style 2–2.5 mm long. Flowers spring and summer.