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The plants belong to the scientific order of Polemoniales and the Solanaceae family of plants. The nightshades include numerous vegetables: potatoes, tomatoes, sweet peppers, hot peppers, eggplant, tomatillos, tamarillos, pepitos, pimentos, paprika, and cayenne peppers.
Nightshade (Solanum species).Â© michael ledray/Shutterstock.com. Members of the Solanaceae family are found throughout the world but are most abundant and widely distributed in the tropical regions of Latin America, where about 40 genera are endemic. Very few members are found in temperate regions, and only about 50 species are found in the United States and Canada combined. The genus Solanum contains almost half of all the species in the family, including all the species of wild potatoes found in the Western Hemisphere.