Turnera diffusa, known as damiana, is a shrub native to southern Texas in the United States, Central America, Mexico, South America, and the Caribbean. It belongs to the family Passifloraceae. Damiana is a relatively small, woody shrub that produces small, aromatic flowers.
Damiana has been used in Mexico, Central America, and South America since the times of the ancient Aztec, and remains quite popular today. Although its noted effect on sexual desire has been its primary traditional use across cultures, it has also been valued as a relaxant, digestive stimulant, mood enhancer, or just an enjoyable beverage that was often given to children. In modern times it has also been used as an herbal smoke and a liqueur.