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The term gymnosperm comes from the Greek word gymnospermos (??µ??spe?µ??), meaning "naked seeds" and referring to the unenclosed condition of the seeds, as when they are produced they are found naked on the scales of a cone or similar structure. There are between 700 and 900 species of Gymnosperm. It is widely accepted [2] that the gymnosperms originated in the late Carboniferous period of the Paleozoic era within the Phanerozoic eon. Early characteristics of seed plants were evident in fossil progymnosperms of the late Devonian period around 380 million years ago.
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