An Introduction to the Genus Equisetum ( Horsetail ) and the Class Equisetopsida ( Sphenopsida ) as a whole
https://internationalequisetologicalassociation.yolasite.com/resources/IEA-Paper-2012.pdf
https://internationalequisetologicalassociation.yolasite.com/resources/IEA-Paper-2012.pdf
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