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Herbs, annual, 10-50(-60) cm tall. Stems erect, 3-angular, winged, glabrous, branched. Leaves alternate; petiole 1-4 mm, winged; blade broadly deltoid-ovate, 0.8-2.5 × 0.4-2.5 cm, upper ones smaller and more narrow, abaxially glabrous, adaxially sparsely puberulent, base truncate or shallowly cordate, often decurrent, apex rounded or acute. Flowers solitary, axillary at leaflike bracts, often forming a raceme; bracts narrowly elliptic, shorter than pedicels; pedicels 1-1.5(-2) cm, slender, with 2 bracteoles at base; bracteoles subulate, less than 1 mm, often caducous. Hypanthium campanulate, 1-2 mm, glabrous; calyx lobes longer than hypanthium at anthesis, but shorter than tube after anthesis, subulate, 2-3 mm, entire. Corolla pale purple, 3-5 mm, inside sparsely puberulent; limb 2-lipped, upper lobes erect, linear, less than 1 mm; lower lobes spreading, elliptic to suborbicular, ca. 2 mm. Stamens connate into tube above middle of filaments; anther tube ca. 1 mm, lower 2 anthers barbate at top. Capsule oblong or obovoid-oblong, 4-5 × 2-4 mm. Seeds pale red-brown, ellipsoid, slightly compressed, smooth. Fl. and fr. Jan-Dec.
Leaves up to 13–35 x 8–20 mm., ovate to suborbicular, gradually narrowing upwards, acute or obtuse at the apex, gradually or abruptly narrowing below into a petiole–like base, usually rather bluntly and shallowly dentate–crenate, glabrous or rarely pubescent on both sides (not in the FZ–area); venation prominent beneath.
Flowers in lax terminal and axillary leafy racemes; pedicels up to 10–20 mm. long, glabrous or papillose; upper bracts lanceolate to ovate or elliptic, shorter to longer than pedicels; bracteoles 0·2–0·8 mm. long, at or near the base of the pedicel.
Corolla 3·5–5·2 mm. long, pink, pale mauve or pale blue, usually with darker markings, split to 0·4–0·5 mm. from the base on the back, pubescent inside on the bottom of the tube.
Anther–tube 0·6–1 mm. long, pubescent at least towards the apex on the back or glabrous; the two lower anthers each with a tuft of hairs and a hyaline appendage at the apex.
Calyx–lobes subulate, erect or somewhat spreading, 1·2–3·2 mm. long, entire or rarely with a single tooth at the margin, glabrous or ciliate.
Capsule obovoid to narrowly obconical, c. 8–nerved, with 2 valves ± 1 mm. long, inferior part of capsule 2·5–5 mm. long.
Stem sparsely to much branched, triangular and broadly winged, glabrous or rarely pubescent (not in the FZ–area).
Filaments linear, the two lower pubescent below, attached to the corolla–tube at the base.
Seeds broadly elliptic in outline, compressed, 0·35–0·45 mm. long, finely striate, brown.
Hypanthium obovoid to obconical, c. 8–nerved, glabrous.
Annual erect or ascending herb, 5–25 cm. tall.
Ovary subinferior.
