Myrtaceae is a family of flowering plants that are well known for their essential oils and spices as well as some exotic looking flowers. There are about 143 genera in the family. More popular genera include Callistemon, Eucalyptus, Melaleuca, Myrtus (Myrtle), Pimenta (Allspice), Psidium (Guava), Syzygium (Clove).