Stems erect, c. 30 cm high, semi-succulent, tending purple around nodes. Leaves very thin. Flowers flat; petals 2-2.3 cm long; large one c. 2.5 cm wide and ± bilobed; other petals c. 1.5-1.6 cm wide, ± obovate, unlobed, orange or pink usually, sometimes white; spur c. 3 cm long. Very common.