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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.
Glycoalkaloids are natural pesticides produced by nightshade plants. Glycoalkaloids are bitter compounds which are found throughout the plant, but their concentrations are especially high in leaves, flowers, and unripe fruits. They are there to defend plants against bacteria, fungi, viruses, and insects.