Annual or short-lived perennial. Stems erect or ascending rather slender, 30-50 cm, with a rather dense eglandular retrorse or spreading indumentum. Leaves broad ovate or triangular-ovate up to c. 25 x 25 mm, truncate cuneate or subcordate, crenate-dentate, all petiolate; petiole on lowermost leaves to 20 mm. Inflorescence lax, of many clearly pedunculate cymes, at least below, or verticillasters, lowermost arising from leaf roils, mostly distant. Pedicels up to 3 mm. Bracts linear-subulate, c. as long as calyces, ciliate. Calyx 3.5-4 mm, often purplish, with spreading villous hairs, narrow tubular; throat oblique; teeth c. 1/3-1/4 length of tube, subulate. Corolla lilac to purplish, c. 8 mm. Nutlets c. 1 x 0.6 mm, oblong-ellipsoid, palish brown, depressed-tuberculate, with a bilobed basal areole, mucilaginous on wetting.