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Molecular phylogeny of horsetails (Equisetum) including chloroplast atpB sequences

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Abstract

Equisetum is a genus of 15 extant species that are the sole surviving representatives of the class Sphenopsida. The generally accepted taxonomy of Equisetum recognizes two subgenera: Equisetum and Hippochaete. Two recent phylogenetical studies have independently questioned the monophyly of subgenus Equisetum. Here, I use original (atpB) and published (rbcL, trnL-trnF, rps4) sequence data to investigate the phylogeny of the genus. Analyses of atpB sequences give an unusual topology, with E. bogotense branching within Hippochaete. A Bayesian analysis based on all available sequences yields a tree with increased resolution, favoring the sister relationships of E. bogotense with subgenus Hippochaete.

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Acknowledgments

I thank Marc Girondot, Bernard Lejeune, and Sophie Nadot for useful advice and discussion. Odile Jonot, Paola Bertolino, and Catherine Colombeau are acknowledged for their help in DNA extractions and amplifications. Chad Husby provided plants from his personal collections and commented on the manuscript. Chad Husby and Franz Tod kindly collected many wild plants for me. I am also grateful to many people who sent me plants and, in some cases, vouchered them for me: Peter Atkinson at Cambridge University Botanic Garden; Holly Forbes at University of California Botanic Garden; Mike Gross at Georgian Court College; Philip O. Ashby, Fiona Inches, and Adele Smith at Royal Botanic Garden, Edinburgh; Sophie Dunand-Martin et Philippe Clerc at Conservatoire et Jardin Botanique de la Ville de Genève; Clinton Morse and Andrew Doran at University of Connecticut; and Nathalie Machon at Conservatoire National Botanique du Bassin Parisien. Tatiana Giraud, Claire Lavigne, Roxana Yockteng, and Odylle Cudelou are also acknowledged for their help.

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  1. Laboratoire Ecologie Systématique et Evolution, UMR 8079 CNRS-Université Paris-Sud, Bâtiment 362, Université Paris-Sud, 91405, Orsay Cedex, France

    Jean-Michel Guillon

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Correspondence to Jean-Michel Guillon.

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Guillon, JM. Molecular phylogeny of horsetails (Equisetum) including chloroplast atpB sequences. J Plant Res 120, 569–574 (2007). https://doi.org/10.1007/s10265-007-0088-x

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  • DOI: https://doi.org/10.1007/s10265-007-0088-x

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