Plants annual, 30-40 cm tall. Stem erect, simple or shortly branched in lower part, glabrous or slightly pubescent in upper part. Leaves opposite or alternate, rarely verticillate; petiole long, 0.5-2 cm, sparsely pubescent; leaf blade ovate or ovate-lanceolate, 4-6 × 2.5-4 cm, abaxially slightly pubescent on veins, adaxially sparsely or densely adpressed hairy, lateral veins 7 or 8 pairs, margin crenate-serrate, apex acute or acuminate. Inflorescences terminal, occasionally axillary, erect, subumbellate or densely racemose, 4-8-flowered; peduncles 1.5-6 cm. Pedicels bracteate at base; bracts linear, ciliate. Flowers pink-purple or purple, small. Lateral sepals 2, lanceolate. Lower sepal navicular, with an incurved spur 8-9 mm. Upper petal ovate-orbicular, abaxial midvein conspicuously cristate; lateral united petals ± clawed; basal lobes orbicular, small; distal lobes subovate; auricle inflexed. Anthers obtuse. Ovary oblong. Capsule elliptic, narrowed at both ends, glabrous. Seeds obovoid, compressed, hairy. Fl. Aug-Sep, fr. Oct.
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