The genus Salvia L., commonly known as sage, is one of the largest genera in the family Lamiaceae (Labiatae). It is known that this genus contains about 1000 plant species, more than 40 of which are endemic to the Mediterranean area. Salvia consists of annual, biennial, perennial, and woody shrubs species, many of which are ethnomedicinally significant in regions where they naturally grow. Salvia has been placed in the subfamily Nepetoideae and is commonly considered as monophyletic. However, the high level of cross-hybridization in this genus makes the study of its chemical features, morphology, and anatomy difficult. Phylogenetic and genetic studies based on morphology, anatomy, and chemical features have many potential disadvantages. For instance, there are many unanswered questions concerning the biogeography, character evolution, and relationships within the genus