Passion flower extract targets the central nervous system and works to ease tension and prevent twitching in the muscles. This calming effect does not affect brain function or respiratory rate, unlike what most Natural passionflower extract is therefore much safer than medications with sedative effects. Passiflora,known also as the passion flowers or passion vines,is a genus of about 500 species of flowering plants,the namesakes of the familyPassifloraceae.They are mostly vines,with some being shrubs,and a few species being herbaceous.For information about the fruit of the passiflora plant,see passionfruit.The monotypic genus Hollrungia seems to be inseparable from Passiflora,but further study is needed.