
Reprinted by permission from Nature: Pryer, Kathleen M.; Schneider, Harald ; Smith, Alan R.; Cranfill, Raymond; Wolf, Paul G.; Hunt, Jeffrey S.; Sipes, Sedonia D. Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants Nature (London). 409(6820). 1 February, 2001. 618-622. Copyright ©2001Macmillan Publishers Ltd. http://www.nature.com/
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