Between the Lime and the Exochorda, which can be expected to have more variety between individual plants?
Exochorda:  Numerous species have been described on the basis of differing appearance and geographical separation, but a systematic study revealed that the different types are closely related and probably all descended from a single species that formerly had a wide distribution that has been fragmented by habitat loss. Lime (fruit): A lime (from French "lime", from Arabic "līma", from Persian "līmū", "lemon") is a hybrid citrus fruit, which is typically round, lime green, 3 – in diameter, and contains acidic juice vesicles.
i don't know