nightshade family

noun
the plant family Solanaceae, characterized by herbaceous plants, trees, shrubs, and vines having alternate, simple or pinnate leaves, conspicuous flowers, and fruit in the form of a berry or capsule, and including belladonna, eggplant, nightshade, peppers of the genus Capsicum, petunia, potato, tobacco, and tomato.
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Encyclopedia Britannica
Encyclopedia

nightshade family

the nightshade, or potato, family of flowering plants (order Solanales), with 102 genera and nearly 2,500 species, many of considerable economic importance as food and drug plants. Among the most important of these are the potato (Solanum tuberosum); eggplant (S. melongena); tomato (Lycopersicon esculentum); garden, or capsicum, pepper (Capsicum annuum and C. frutescens); tobacco (Nicotiana tabacum); deadly nightshade, the source of belladonna (Atropa belladonna); the poisonous jimsonweed (Datura stramonium) and nightshades (S. nigrum, S. dulcamara, and others); and many garden ornamentals, such as the genera Petunia, Lycium, Solanum, Nicotiana, Datura, Salpiglossis, Browallia, Brunfelsia, Cestrum, Schizanthus, Solandra, Streptosolen, and Nierembergia.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Moreover, being part of the nightshade family, those seed pods are actually
  poisonous.
Maybe there's a hint of danger on this side of the nightshade family, too.
Roasting at a high temperature seems to sweeten this member of the nightshade
  family.
Tomatillo is a member of the nightshade family, related to tomatoes.
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