Abstract
The taxonomy and distribution of Pacific Annonaceae are reviewed in light of recent changes in generic delimitations. A new species of the genus Monoon from the Solomon Archipelago is described, Monoon salomonicum I.M.Turner & Utteridge sp. nov., together with an apparently related new species from New Guinea, Monoon pachypetalum I.M.Turner & Utteridge sp. nov. The confirmed presence of the genus in the Solomon Islands extends the generic range eastward beyond New Guinea. Two new species of Huberantha are described, Huberantha asymmetrica I.M.Turner & Utteridge sp. nov. and Huberantha whistleri I.M.Turner & Utteridge sp. nov., from the Solomon Islands and Samoa respectively. New combinations are proposed: Drepananthus novoguineensis (Baker f.) I.M.Turner & Utteridge comb. nov., Meiogyne punctulata (Baill.) I.M.Turner & Utteridge comb. nov. and Monoon merrillii (Kaneh.) I.M.Turner & Utteridge comb. nov. One neotype and four lectotypes are designated. The geographic patterns exhibited by nine native Annonaceae genera, that range in the Pacific beyond New Guinea, are discussed.
Highlights
There has been considerable change in the classification of the large tropical family the Annonaceae over recent decades (Chatrou et al 2012)
We describe two new species of Monoon and two new species of Huberantha
The genus has not been monographed, but in listing the species that they recognised in the genus and making many new combinations, Xue et al (2012) included three species from New Guinea: Monoon chloranthum (Lauterb. & K.Schum.) B.Xue & R.M.K.Saunders, Monoon chloroxanthum Miq. and Monoon polycarpum (Burck) B.Xue & R.M.K.Saunders
Summary
There has been considerable change in the classification of the large tropical family the Annonaceae over recent decades (Chatrou et al 2012). In this region (here taken as the Solomon Archipelago and beyond but not including the Bismarck Archipelago) the realignment of genera and the correction of faulty generic placements have led to name changes in a relatively high proportion of the native species. The currently accepted scenario for colonisation of this region by Annonaceae genera is one of dispersal from West Malesia to East Malesia, Australia and the Pacific, probably in the Miocene (5–23 Ma), during periods of relatively low sea levels resulting in larger and more closely spaced stepping stones that facilitated such migration. This has been inferred from molecular phylogenies and estimated divergence times in the Annonaceae genera Meiogyne
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