Most modern plant families and genera evolved during or after the time when the supercontinent Pangaea was breaking up.Because of this evolutionary history,one would expect the plant families and genera of North America to be most similar to those of

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North America and Asia were connected during the time of Pangaea and have had intermittent connections since then, which allowed for the exchange of plant species and genetic material. This would lead to similarities between their plant families and genera.

Most Modern Plant Families and Genera Evolved During or After