Equisetales

plural noun
Eq·​ui·​se·​ta·​les

Definition of Equisetales 

: an order of lower tracheophytes (subdivision Sphenopsida) that have the sporangiophores inserted directly on the axis and have existed since the Devonian — see calamariaceae, equisetaceae — compare archaeocalamites

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History and Etymology for Equisetales

New Latin, from Equisetum + -ales

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