Slender erect or ascending annual or short-lived perennial. Stems simple or branched, 30-60 cm, quadrangular, with short adpressed retrorse eglandular hairs. Leaves ovate to ovate-triangular, thin-textured, c. 25-30 x 16-20 mm, eglandular pilose to villous with numerous oil globules on abaxial surface, crenate to serrate, truncate to cordate, acute; petiole slender, up to 20 mm on lower stem leaves, less above. Inflorescence of few-flowered, lax cymes on very slender ± filiform peduncles and pedicels; lowermost cymes borne in axils of leaves. Peduncles horizontally spreading or spreading-erect up to 25 mm. Bracts linear-subulate, ciliate, shorter than calyces. Pedicels up to 3.5 mm. Calyx c. 4.5 mm, eglandular pilose with scattered oil globules; throat oblique, villous within; teeth unequal, subulate from a narrow triangular base, longest as long as calyx tube. Corolla 7-9 mm, pink or lilac; tube exserted from calyx. Nutlets 1.2 x 0.6 mm, brown, broad ellipsoid, flat-tuberculate, somewhat flattened, with a bibbed areole c. 1/3 length of nutlet.