Flowers of the solanaceae (nightshade) family are characterised by their (five) fused petals, beneath which is a lobed calyx formed of five fused sepals. The flower center contains five stamens, attached at the base of the ovary. Leaves tend to be undivided, alternate and stalked. Leaf edges can be entire or lobed. Plants may be herbs, vines, trees or shrubs. There are 211 species in the US, in 38 genera; some are poisonous, but others are edible, including the tomato, potato, eggplant and various varieties of pepper.