Figure 18.20   Diverse gymnosperms: (a) leaves of the modern ginkgo, Ginkgo biloba and (b) of the Jurassic ginkgo, Sphenobaiera paucipartita; (c) reconstruction of the 1.5 m-tall cycad Leptocycas gigas a from the Late Triassic of North America; and (d) reconstruction of the 2 m-tall bennettitalean Cycadeoidea from the Cretaceous of North America. (Based on Delevoryas 1977.)

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