"Silphium" is an extinct plant species, suspected to be used as an Ancient Roman contraceptive
It has been speculated that the plant may also have functioned as a contraceptive, based partly on Pliny's statement that it could be used "to promote the menstrual discharge".[3] Many species in the parsley family have estrogenic properties, and some, such as wild carrot, have been found to work as abortifacients (chemicals that terminate a pregnancy). Given this, it is quite possible that the plant was pharmacologically active in the prevention or termination of pregnancy.@Curionic
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