Taylor, Thomas N. Department of Biology, University of Kansas, Lawrence, Kansas.
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One of the major divisions (formerly known as Equisetophyta) of vascular plants that includes both living and fossil representatives. The three principal orders are Pseudoborniales (Devonian), Sphenophyllales (Devonian-Triassic), and Equisetales (Devonian-Recent); the Hyeniales (Devonian) may also be sphenophytes. See also: Equisetales; Hyeniales; Pseudoborniales; Sphenophyllales
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