Passiflora,known also as the passion flowers or passion vines, is a genus of about 500 species of flowering plants, the namesakes of the family Passifloraceae.They are mostly vines, with some being shrubs, and a few species being herbaceous.
Approximately 2.5 percent appears to be flavonoids such as vitexin, orientin, homo-orientin, saponarin, schaftoside, and a few others as glucosides, together with free flavonoids including apigenin, luteolin, quercetin, and kaempferol.
In Europe, passionflower is required to contain not less than 0.8 percent total flavonoids, calculated as vitexin.
