Coriander is a member of the parsley (Apiaceae) family. It's an annual plant that grows on slender green stems. The aromatic plant can grow up to three feet tall and the leaves resemble parsley leaves. It is one of the oldest herbs and spices on record. Both the leaves and fruit (seeds) of coriander are used as food and medicine. However, the term "coriander" is typically used to refer to the fruit. Coriander leaves are usually referred to as cilantro.