Glabrous subshrub to c. 2 m high, bushy; stems green, ± succulent above. Lvs in whorls of up to 6. Petioles 0.5-2 cm long, winged. Lamina 6-12 × 2-3.5 cm, oblong or oblong-obovate, prominently glandular-ciliate; base attenuate or narrow-cuneate; apex acute. Fls solitary on slender pedicels amongst axils of uppermost lvs, 5-6.5 cm diam., pink. Lateral sepals 10-11 mm long, ovate, acuminate. Posterior sepal broadly ovate, convex and keeled when fresh, flat or nearly so when dry; spur 2-4.5 cm long; very slender. Corolla irregular, flattened and in 1 plane; upper petal c. 2.5-3 × 2.5-3 cm, deeply emarginate; each lateral petal united at base, having a lower obovate and an upper suborbicular segment, c. 2-2.5 × 1.5-2.5 cm, slightly emarginate. Anthers rose. Fr. to c. 2.5 cm long, fusiform. Seed not seen.