Based on morphological and molecular data, we have concluded that Acmena, Acmenosperma, Cleistocalyx, Piliocalyx and Waterhousea should be combined with Syzygium. The five genera are formally transferred to Syzygium and new names provided for those of their accepted representatives for which names are as yet not available in Syzygium, with the exception of the New Caledonian members of Piliocalyx as these currently are being revised.

Myrtaceae, Acmena, Acmenosperma, Cleistocalyx, Piliocalyx, Syzygium, Waterhousea, taxonomy
Blumea: Biodiversity, Evolution and Biogeography of Plants

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Naturalis journals & series

Craven, L.A, Biffin, E, & Ashton, P.S. (2006). Acmena, Acmenosperma, Cleistocalyx, Piliocalyx and Waterhousea formally transferred to Syzygium (Myrtaceae). Blumea: Biodiversity, Evolution and Biogeography of Plants, 51(1), 131–142.