Turnera diffusa, known as Damiana, is a shrub belonging to the family Passifloraceaenative. The plant is native to Central America, South America, Caribbean Islands, and Native America, specifically, Texas. Damiana is a mental and physical stimulant that can help battle fatigue. The herb is also an aphrodisiac and can help treat sexual problems such as impotence. Damiana in general is a tonic and is valuable tool for those suffering from mild depression.