Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants
Pryer, K. M., H .Schneider, A. R. Smith, R. Cranfill, P. G. Wolf, J. S. Hunt, and S. D. Sipes
Nature. 409, 2001, 618-622
© 2001 Nature Publishing Group http://www.nature.com/. Reproduced with permission.
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