3500 species in 180 genera are of cosmopolitan distribution. The leaves are often hairy and possess epidermal glands which secrete volatile oils giving characteristic scents to many species.
Many species yield essential oils.
Coleus 150 species are palaeotropical. Many hybrids and forms are popular as house, greenhouse and garden plants. Lavandula 28 species are native to Atlantic Islands and the Mediterranean region west to India. L. spica and L. stoechas are also used. The oils from the various commercial plants vary considerably in chemical content.