This is a small, obscure family consisting of three genera and 12 species. The three genera are: Gelsemium (three species), Mostuea (eight species) and Ptelocarpa (one species). This is a recently reformed family that has been the subject of much reclassification. Swamp jessamine (Gelsemium rankinii) and yellow jessamine (Gelsemium sempervirens) are are native to the southeastern U.S. The other species, including the pan-Asiatic heartbreak grass (Gelsemium elegans), are spread throughout the tropics.
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