Damiana Leaf Turnera diffusa common names: Damina Mexican damiana Damiane oreganillo the bourrique Mexican holly damiana de Gerrero. Damiana leaves come from a small shrub that’s found throughout Mexico Central America and the West Indies as well as parts of South America. This shrub has pale yellow flowers that bloom in early to late summer. However the most important part of the plant is its leaves which are harvested during the flowering season. The leaves contain essential oil resins tannins starch arbutin bartering and a bitter substance known as damianin. Damiana has a long history of herbal uses around the world.