Black nightshade, common name for both a family of plants, and for a genus of mostly weedy plants. The nightshade family has about 90 genera and 2,600 species and includes crop and garden plants such as potato, tomato, petunia, tobacco and eggplant, as well as many poisonous plants. However, black nightshade with the botanical name solunum nigrum is useful as natural remedies.

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