Some plants have great medicinal value, some are quite poisonous.
The calyx and corolla are 5-lobed, and usually there are 5 stamens. The fruit is partitioned into 2 or 4 seed-producing divisions, and may be dry or a fleshy berry. Identification of the nightshades can be really confusing - the same plant, when keyed out, will often lead to two different identities. These are covered in the entry Solanum sp. February - October.