Which plant family includes tomatoes, potatoes, and eggplants?

Which plant family includes tomatoes, potatoes, and eggplants? Solanaceae includes all three crops. Also called the nightshade family, Solanaceae is a flowering-plant family in the order Solanales. Tomatoes, potatoes, and eggplants belong to the genus Solanum, which contains roughly 1,500 species and is the family’s largest genus.

The family includes several other familiar plants, including peppers, tobacco, petunias, and deadly nightshade. This is why a culinary group that seems unrelated—fruits, tubers, ornamental flowers, and tobacco—can share a botanical family. Many nightshades produce alkaloids, chemical compounds that help defend plants from herbivores.

A common mix-up is assuming that all nightshades are poisonous. Some species and plant parts contain harmful compounds, but tomatoes, potatoes, and eggplants are important food crops when properly grown and prepared. Another surprise is that the potato is botanically a stem tuber, while the tomato and eggplant are fruits.

Solanaceae originated primarily in the Americas, especially South America, but its members are now cultivated worldwide. The family is recognized by botanical relationships, not by whether a plant is edible or resembles its relatives.