Diversity and origin Gymnosperm



zamia integrifolia, cycad native florida


conifers far abundant extant group of gymnosperms 6 8 families, total of 65-70 genera , 600-630 species (696 accepted names). conifers woody plants , evergreens. leaves of many conifers long, thin , needle-like, other species, including cupressaceae , podocarpaceae, have flat, triangular scale-like leaves. agathis in araucariaceae , nageia in podocarpaceae have broad, flat strap-shaped leaves.


cycads next abundant group of gymnosperms, 2 or 3 families, 11 genera, , approximately 338 species. majority of cycads native tropical climates , abundantly found in regions near equator. other extant groups 95-100 species of gnetales , 1 species of ginkgo.








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