Herbs annual. Stems slender, suberect to decumbent, 30-50 cm, sparsely puberulent, much branched. Stem leaves petiolate; blade ovate, ca. 2 × 1 cm, adaxially sparsely puberulent, abaxially densely pubescent, sparsely puberulent on veins, base cordate, margin crenate, apex obtuse. Verticillasters 2(-4)-flowered, widely spaced; upper floral leaves sessile, base cuneate, margin ± entire, shorter than calyx; bracteoles ca. 1 mm. Pedicel ca. 1 mm. Calyx tubular-campanulate, ca. 3 mm, densely puberulent, 10-veined; teeth subequal, lanceolate-triangular, ca. 1 mm, apex acute; fruiting calyx urceolate, conspicuously netted. Corolla red, ca. 3 mm, nearly included; upper lip ovate, ca. 1 mm, puberulent outside; lower lip spreading, pubescent outside; middle lobe largest, circular; lateral lobes ovate. Nutlets brown, ovoid, ca. 1.5 mm. Fl. and fr. year round.
"Taprooted annual; stems diffuse or decumbent, 2–6 dm, sparsely hirsute; lvs broadly ovate, 2–4 cm, broadly obtuse or rounded at the summit, coarsely serrate, truncate or subcordate at base; petioles of the main lvs a third to half as long as the blade; cal-lobes nearly as long as the tube; cor anthocyanic to white, 6–8 mm, scarcely exceeding the cal; 2n=10, 20. Native of Europe, now an occasional weed from Me. to Va. and casually inland. July–Oct."
Annual herb branching from the base; stems erect or decumbent, simple or branched, 0.2-0.4 m long, hispid-pilose with long spreading hairs. Leaves petiolate; blade broadly ovate, 20-30 x 10-20 mm, appressed-pilose on both surfaces, apex rounded, base shallowly cordate to truncate, margin crenate to crenate-serrate; petiole up to 10 mm long. Inflorescence of several verticils, lax below, crowded towards the apex; verticils (2-)4-6-flowered; bracts leaf-like below, becoming smaller and subequal to the calyx above. Calyx hirsute with long multicellular hairs and some gland-tipped hairs, 6-7 mm long. Corolla scarcely longer than the calyx, mauve; tube 5 mm long; upper lip 1.5 mm long; lower lip 2 mm long.
Indigenous in Europe, the Middle East, north Africa and the Atlantic Islands, now widespread throughout the World and introduced into South Africa before the end of the 17th Century (represented in Herb. Oldenland fide Burm. f., Fl. Cap. Prodr. 16, 1768); mainly in the south-western Cape Province, with two records from East London.