Equisetatae

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Noun1.Equisetatae - horsetails and related forms
class Equisetatae, class Sphenopsida, Sphenopsida
class - (biology) a taxonomic group containing one or more orders
division Pteridophyta, Pteridophyta - containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta
Equisetales, order Equisetales - lower tracheophytes in existence since the Devonian
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