Plants annual, (3-)20-60 cm tall. Stem erect, branched, glabrous. Leaf petiole (0.2-)1-2.5 cm; leaf blade elliptic-lanceolate or elliptic-ovate, (1.5-)5-10 × (0.5-)2-4(-5) cm, membranous, both surfaces glabrous, setose between teeth, lateral veins 7-9 pairs, base cuneate, attenuate into petiole, margin crenate, apex acuminate. Inflorescences axillary or subterminal, racemose, 2-10 cm, 4-10-flowered; peduncles often over subtending leaves, slender. Pedicels slender, bracteate at base; bracts persistent, ovate-lanceolate, small, apex glandular. Flowers yellow or pale yellow, small; buds apically rounded. Lateral sepals 2, red when dry, falcate or obliquely ovate, small, 2-3 mm, with 1 gland at one side of upper margin, apex aristate. Lower sepal navicular, usually 1.1-1.8 cm deep including spur, narrowed into an incurved, long spur, or spur very short or absent. Upper petal cucullate, orbicular, 3-5 × 5-8 mm, abaxial midvein not thickened; lateral united petals not clawed, 2-lobed; basal lobes ovate to orbicular, 2-5 × 1.5-3 mm; distal lobes broadly dolabriform, 0.7-1.4 × 0.4-0.7 cm, apically 2-lobed, apex rounded; auricles rounded. Anthers obtuse. Capsule linear or narrowly clavate, to 2.5 cm. Seeds many, brown, oblong. Fl. Jun-Aug.
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A herb which has many branches. It grows each year from seed. It grows 20-60 cm tall. The leaves are alternate and have stalks. They are oval and taper to the tip. They have small rounded teeth along the edge. The flowers are yellow. The spur is rounded. The fruit is a capsule and is club shaped. The seeds are brown and oblong.
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