Redefinition of Zehneria and four new related genera (Cucurbitaceae), with an enumeration of the Australasian and Pacific species

The genus Zehneria Endl. is split into 5 genera, of which 4 are new: Indomelothria, Neoachmandra, Scopella, and Urceodiscus. Apart from several new combinations and taxa of subspecific rank, the following species are described as new: I. chlorocarpa, N. backeri, N. lancifolia, N. macrantha, N. nesophila, N. platysperma, U. arfakensis, U. carrii, U. hippocrepicus, U. parviflora, U. scabridula, U. viridis, Z. elbertii, Z. erythrobacca, Z. immarginata, Z. neocaledonica, Z. pedicellata, Z. pisifera, Z. tahitensis, and Z. trullifolia. The New World genus Melothria was introduced in Asia where it is represented by one species, M. pendula L.