Plants annual, 10-30 cm tall, glabrous. Stem slender, simple or shortly branched. Leaves alternate; petiole 1-5 cm, slender; leaf blade ovate, 3-5 × 1.5-2.5 cm, thinly membranous, without basal glands, lateral veins 4 or 5 pairs, base cuneate or truncate, margin coarsely crenate, teeth obtuse or emarginate, mucronulate, apex acuminate or slightly acute. Inflorescences axillary, 1-or 2-flowered; peduncles shorter or longer than petioles. Pedicels ca. 1 cm, bracteate at middle; bracts ovate-lanceolate. Flowers white, small, ca. 1 cm in diam. Lateral sepals 2, green, linear, apex acute, abaxial midvein carinate, apex acute. Lower sepal navicular, gradually narrowed into an incurved spur ca. as long as limb. Upper petal broadly elliptic, 4-5 mm, cucullate, apex acute, abaxial midvein thickened, broadly carinate; lateral united petals clawed, 2-lobed; basal lobes ovate, apex acute; distal lobes dolabriform, ca. 3 × as long as basal lobes, apex obtuse; auricle inflexed, reniform. Anthers small, obtuse. Capsule linear, 3-3.5 cm. Seeds 3-5, elliptic, smooth. Fl. Jun-Sep.
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