The term 'Plant of the Nightshade Family' refers to two plants in particular: the TOMATO (6 letters) and henbane (7 letters). The TOMATO is a widely cultivated plant that is used as a food source in many cultures. It is a member of the nightshade family, which includes other edible plants such as potatoes, peppers, and eggplants. Henbane is a toxic plant that has been used for medicinal purposes since ancient times. It is also a member of the nightshade family and contains several alkaloids that can be poisonous if ingested in large amounts.