Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants

@article{Pryer2001HorsetailsAF,
  title={Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants},
  author={Kathleen M Pryer and Harald Schneider and Alan R. Smith and Raymond Cranfill and Paul G. Wolf and Jeffrey S. Hunt and Sedonia D Sipes},
  journal={Nature},
  year={2001},
  volume={409},
  pages={618-622}
}
Most of the 470-million-year history of plants on land belongs to bryophytes, pteridophytes and gymnosperms, which eventually yielded to the ecological dominance by angiosperms 90 Myr ago. Our knowledge of angiosperm phylogeny, particularly the branching order of the earliest lineages, has recently been increased by the concurrence of multigene sequence analyses. However, reconstructing relationships for all the main lineages of vascular plants that diverged since the Devonian period has… 

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