Glabrous aromatic annual or short-lived perennial with long trailing or scrambling, succulent stems, sometimes climbing to 2 m high. Lvs simple, peltate. Petioles to c. 30 cm long, usually not coiling. Lamina to c. 18-(21) cm diam., suborbicular, often slightly asymmetric, entire but often sinuate, glaucescent beneath. Fls usually solitary, sometimes in clusters of 2-3; pedicels resembling petioles in length and form. Calyx somewhat irregular, pale orange; sepals 1.5-2.2 cm long, narrow-ovate to narrowly ovate-oblong, the dorsal and 2 lateral sepals larger; spur 2.5-3.3 cm long, ± curved, tapering, usually pale orange. Corolla moderately irregular, (2)-3-4 × (1.7)-2.2-3.3 cm, usually yellow or orange to scarlet, sometimes semi-double with 7-8 petals; lower 3 petals with very slender claw and broad-ovate to almost reniform limb, the limb fimbriate at base and ± sinuate or undulate; upper 2 petals with claw broader and adnate to calyx at base, often with crimson markings on claw and lower limb. Supernumary petals usually 0, but if present, similar to lower 3 but smaller. Stamens yellow to reddish, the same colour as corolla. Frs dry; carpels with 2 flattened faces and the third or dorsal side rounded and obtusely ribbed, remaining green until abscission, usually 1-2 remaining small; fertile carpels 1-1.4 cm long.