Plants annual, 20-60 cm tall, rarely taller. Stem erect or with procumbent branches, glabrous. Leaves alternate; petiole 5-10 cm, with 2 globose basal glands; leaf blade ovate-oblong, 2.5-5 × 1.5-2 cm, ciliate at base, lateral veins 6-8 pairs, base cuneate, margin sharply serrate, apex acute or acuminate. Inflorescences axillary, 1(or 2)-flowered; peduncles short, 0.6-2 cm. Pedicels bracteate at middle; bracts setose or narrowly lanceolate. Flowers spreading, yellow, red spotted or not, 2-2.5 cm deep. Lateral sepals 2, green, ovate or ovate-oblong, apex mucronulate. Lower sepal funnelform, narrowed into an incurved or erect spur 1-2 cm. Upper petal cucullate, orbicular, ca. 1 cm, apex mucronate, abaxial midvein thickened; lateral united petals clawed, 2.2-2.5 cm, 2-lobed; basal lobes ovate to orbicular, 5-6 mm, small; distal lobes large, broadly obovate, falcate basally, apex rounded; auricle absent. Filaments linear; anthers small. Capsule linear-cylindric, to 2 cm. Fl. Aug-Sep. 2n = 14.
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An erect herb. It grows about 40 cm high. The leaves are alternate and on stalks. They are oval with teeth along the edge. They are thin in texture. The flowers occur singly. They are yellow and in the axils of leaves. The spur is as long as the rest of the flower. The fruit is a capsule.
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