Stace, C.A. (1997) New Flora of the British Isles. 2nd edition. Cambridge University Press, Cambridge
Description of the genus
Unarmed shrubs. Stipules
caducous. Leaves simple, entire. Flowers solitary, in cymose clusters or corymbs. Petals 5, white or pink. Carpels 2-5; ovules
2 in each carpel. Styles 2-5. Fruit with mealy flesh, red (in ours) with 2-5 pyrenes.