Annual or possibly short-lived perennial. Stems to c. 30 cm tall, glabrous. Lvs glabrous; petioles 3-20 mm long. Lamina 1.5-6.5 × 1-2.5 cm, ovate, coarsely and irregularly serrate; base truncate, rounded or subcordate, with blade sometimes shortly attenuate; apex acute. Infl. sub-corymbose; bracts linear, mostly entire, the lowest distantly serrate. Pedicels slender, to 2 cm long, ± glandular. Sepals 3-4 mm long, lanceolate or elliptic-lanceolate; margins often ciliate. Corolla 8-11 mm long, white; spur c. 6-7 mm long, obtuse; upper lip with rounded lobes; lower lip slightly emarginate, broad; pouch yellow and composed of dense glandular puberulence. Capsule 10-12 × 6-8 mm, broadly urceolate-oblong; base rounded; valves diverging at an obtuse angle. Seed c. 1 mm long, fusiform; wing broad, suborbicular.