The genus Miliusa (Annonaceae) in the Austro-Malesian area

A taxonomic revision of the Austro-Malesian species of Miliusa Lesch. ex A.DC. (Annonaceae) is presented. Ten species can be recognised in the area, including one new species, Miliusa novoguineensis, described here. Most species are restricted to certain islands or geographic areas. Miliusa horsfieldii (Benn.) Pierre is the main exception as it is distributed from Hainan up to Queensland, Australia. Six of the ten species (except M. amplexicaulis Ridl., M. longipes King, M. macropoda Miq. and M. parviflora Ridl.) have a deciduous habit, and are largely restricted to areas with a monsoon climate. A key, based primarily on generative characters, and descriptions to the species are included.