Clapham, A.R., Tutin, T.G. & Moore, D.M. (1989) Flora of the British Isles. 3rd edition. Cambridge University Press, Cambridge
Creeping perennial herbs. Leaves petiolate, lobed, palmately-veined, alternate above, opposite below. Flowers solitary in the leaf axils. Calyx 5-lobed.Corolla tube spurred at base. Stamens 4. Capsule opening by 2 lateral pores, each pore with 3 valves.
Worldwide: 9 species in W Europe, the Mediterranean region to Iran
Zimbabwe: 1 cultivated taxon.