Plants annual, 50-80 cm tall. Stem erect, robust, branched in upper part, sparsely glandular hairy or glabrous. Leaves alternate; petiole 2-5 cm; leaf blade ovate-oblong or ovate-lanceolate, 7-18 × 2.5-5 cm, lateral veins 6-8 pairs, base cuneate, margin coarsely crenate or crenulate, apex acuminate. Inflorescences axillary; racemose, 5-13-flowered; peduncles 6-10 cm. Pedicels slender, bracteate at base; bracts ovate, apex glandular-aristate. Flowers yellow. Lateral sepals 2, broadly ovate, apex glandular-aristate. Lower sepal funnelform, narrowed into a curved, long spur. Upper petal orbicular, apex mucronulate, abaxial midvein carinate; lateral united petals ± clawed, 2-lobed; basal lobes suborbicular; distal lobes narrowly lanceolate. Anthers obtuse. Capsule linear. Fl. Aug-Sep.
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