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The Botanical Review

, Volume 79, Issue 2, pp 147–177 | Cite as

Biology and Functional Ecology of Equisetum with Emphasis on the Giant Horsetails

  • Chad Husby
Article

Abstract

Horsetails are unique survivors of a very ancient group of vascular plants, the Sphenophyta, which has a history reaching back to the Upper Devonian. Despite the striking conservatism of Equisetum architecture and anatomy and the small number of species (15) in the modern flora, their ability to thrive under a wide range of conditions is remarkable. This is due to a diverse suite of adaptations that allow tolerance of disturbance, soil anoxia, high metals, and salinity, along with efficient nutrient uptake and nitrogen fixation. The giant horsetails represent the largest living Sphenophyta and provide insights into how their larger ancestors lived and how this ancient lineage has managed to survive in tropical regions.

Keywords

Equisetum Pteridophyte Functional ecology Root biology Phylogeny Horsetails 

Notes

Acknowledgments

I would like to thank the late Dr. Warren H. Wagner, Jr. for his encouragement to pursue studies of Equisetum. I also thank Dr. Jack Fisher for suggesting the development of this manuscript.

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© The New York Botanical Garden 2013

Authors and Affiliations

  1. 1.The Montgomery Botanical CenterCoral GablesUSA

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