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Taxonomic revision of Phyllanthus (Phyllanthaceae) in Madagascar and the Comoro Islands I: synopsis and subgenera Isocladus, Betsileani, Kirganelia and Tenellanthus

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Summary

In this first part of a taxonomic revision of Phyllanthus L. in Madagascar and the Comoro Islands, a synopsis of the 55 species and a key to the nine subgenera (three of which are new) and two sections are given. The taxonomic treatment in this paper includes the 11 species, four subspecies and two varieties of subgenera Isocladus G. L. Webster, Betsileani (Jean F. Brunel) Ralim. & Petra Hoffm. stat. nov., Kirganelia (A. Juss.) G. L. Webster and Tenellanthus Jean F. Brunel. Distribution maps and IUCN conservation assessments are provided for each taxon. The three Madagascan endemic species without phyllanthoid branching are placed in the new subgen. Betsileani separate from subgen. Isocladus. Revised circumscription of species within Kirganelia s.s. reduces the number of species in this group from nine to four. Section Pentandra G. L. Webster is separated as subgen. Tenellanthus as suggested by Brunel (1987).

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Acknowledgements

We would like to thank the Friends of Kew, the Bentham Moxon Trust and the Royal Botanic Gardens, Kew, who generously supported this study. We also thank the staff of the following herbaria for placing at our disposal herbarium material of Phyllanthus: BM, K, LINN, P, TAN, TEF. Study and field work was conducted under a collaboration agreement between the Royal Botanic Gardens, Kew and the Association Nationale pour la Gestion des Aires Protégées (ANGAP), Parc Botanique et Zoologique de Tsimbazaza (PBZT) and the Département de Biologie et Ecologie Végétales de l’Université d’Antananarivo (DBEV). We particularly thank C. Rajeriarison (DBEV), the university supervisor of this study, D. Kirkup (K) for assistance with DELTA, G. Challen (K) for general and curatorial assistance, especially during visits of the first author to Kew, S. Bachman (K) for producing the maps, A. Davis (K) for nomenclatural advice, G. McPherson (MO) for reviewing the manuscript, R. Lala (MO) for Figs 1, 2, 3 and 5, 6, Ny Avo R. (DBEV) for Fig. 4 and R. Rajaonarison for driving us during fieldwork. We also thank M. Vorontsova (BM/K) and M. Thomas (K) for their help.

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Authors and Affiliations

  1. Madagascar Conservation Centre, Royal Botanic Gardens, Kew, Lot II J 131 B Ambodivoanjo, 101, Antananarivo, Madagascar

    Hélène Ralimanana

  2. University of Antananarivo, B.P. 906, Antananarivo, Madagascar

    Hélène Ralimanana

  3. Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, UK

    Petra Hoffmann

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  1. Hélène Ralimanana
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  2. Petra Hoffmann
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Correspondence to Hélène Ralimanana.

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Ralimanana, H., Hoffmann, P. Taxonomic revision of Phyllanthus (Phyllanthaceae) in Madagascar and the Comoro Islands I: synopsis and subgenera Isocladus, Betsileani, Kirganelia and Tenellanthus . Kew Bull 66, 331–365 (2011). https://doi.org/10.1007/s12225-011-9294-8

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