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  Section: Introduction to Botany » Gymnosperms
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The First Seed Plants

  The First Seed Plants
  Classifying the Gymnosperms
  Ginkgo biloba

The first seed plants were seed ferns and some primitive conifers. All of these can be called gymnosperms, forms whereinth e seeds are not enclosed within ovaries. Seed ferns that bore seeds on their leaves appeared during the Carboniferous period of the Paleozoic era, approximately 340 to 280 million years ago. Although these ferns became extinct during the Mesozoic era, the plants that evolved into modem seed plants probably trace their origin to them.


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