Hairy perennial; stems lax or decumbent, rooting at nodes and sometimes forming a loose mat, ascending to c. 30 cm; internodes with dense bifarious hairs. Lvs sessile or with petiole 0.5-3-(7) mm long. Lamina 1.2-3.5 × 1-2.5 cm, ovate to elliptic, coarsely serrate or crenate-serrate, hairy beneath, becoming glabrous above; base rounded or ± subcordate; apex obtuse. Racemes to c. 15 cm long, slender, hairy, axillary and opposite but superficially appearing terminal; pedicels usually 5-8 mm long, slender, much > bracts. Bracts ± elliptic, small. Calyx 3-5 mm long, accrescent; lobes narrowly oblong elliptic or narrow-elliptic, hairy, obtuse or subacute; margin prominently long-ciliate. Corolla 10-13 mm diam., bright blue with white central eye and fine dark veins. Capsule c. 6 mm wide; lobes divergent, with raised nerves and ciliate margins. Seed not seen.