flowering branch; photograph by M. van Balgooy, NHN Leiden
flowering branch; photograph by L.J.G. van der Maesen, NHN Wageningen
fruiting branch; photograph by J. Ridder-Numan, NHN Leiden
flowering and fruiting branch; drawing from Th. F. Colladon (1816), Histoire Naturelle et Medicale des Casses f. 5