Petunia is genus of 35 species of flowering plants of South American origin, closely related to tobacco, cape gooseberries, tomatoes, deadly nightshades, potatoes and chili peppers; in the family Solanaceae. The popular flower of the same name derived its epithet from the French, which took the word petun, meaning “tobacco,” from a Tupi–Guarani language. An annual, most of the varieties seen in gardens are hybrids [Petunia × atkinsiana, also known as Petunia × hybrid].
Petunia is a genus in the family Solanaceae, subfamily Petunioideae. Well known members of Solanaceae in other subfamilies include tobacco [Nicotianoideae], and the cape gooseberry, tomato, potato, deadly nightshades and chili pepper [Solanoideae].