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cycadophyte

any member of a diverse collection of mostly extinct primitive gymnospermous plants. They probably had their origins among the progymnosperms of the Devonian Period (416 to 359 million years ago), possibly among a primitive, long-extinct group of non-seed-bearing plants, the Aneurophytaceae, in which disposition of fertile structures and patterns of branching bear some resemblance to those of seed ferns.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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