Extrafloral Nectaries in Solanum

Abstract
Extrafloral nectaries (EFN) occur on the corollas of 3 dioecious species of Solanum (S. cunninghambii Benth., S. dioicum W.V. Fitzg., and S. tudununggae Symon) from Australia. S. dioicum also bears EFN on the leaves. This is the 1st report of nectaries of any kind for the genus Solanum, the 1st report of EFN for the family Solanaceae, and only the 3rd genus from the 8 families in the order Solanales possessing EFN. The EFN are structurally complex and seem to function during the bud stage during which time they are actively visited by ants.