Ziziphus is a genus of 80-100 species, native in the tropics and warm-temperate regions of the world. It is rather heterogeneous and possibly not monophyletic. Old World species are more closely related to Paliurus than to New World species (Mabberley 2008). Several species are economically important (for timber, edible fruits or as ornamentals). Three species are cultivated in Europe (McKean 1997).
Mabberley D.J. (2008) Mabberley’s plant-book (3th ed.). Cambridge University Press, Cambridge: XVIII + 1021 p.
McKean D.R. (1997) Ziziphus. In: Cullen J. & al. (eds.), The European Garden Flora, vol. 5. Cambridge University Press, Cambridge: 189-190.