A flowering vine plant,Gelsemium spp.,includes two separate species that formerly occupied a large,common habitat area,and currently occupy overlapping areas in the southeastern United States.Gelsemium sempervirens and Gelsemium rankinii have reproductive isolation,which has allowed them to exist as separate species due to

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Sympatric speciation occurs when new species evolve from a single ancestral species while inhabiting the same geographic region. In this case, Gelsemium sempervirens and Gelsemium rankinii have reproductive isolation but share overlapping areas, indicating they evolved into separate species while still in the same environment, characteristic of sympatric speciation.

A Flowering Vine Plant,Gelsemium Spp