Classification
Under the Cronquist system, the first four families (including Begoniaceae, Cucurbitaceae, and Datiscaceae), were placed in the order Violales, within the Dilleniidae, with the Tetramelaceae subsumed within the Datiscaceae. The other families were distributed throughout various orders. The present classification is due to APG III (2009).
Read more about this topic: Cucurbitales