Categories Wildflowers | yellow & orange flowers |Aristolochia clematitis Aristolochia clematitisCommon name(s): Birthwort, HeartwortSynonyme(s): N/AFamily: AristolochiaceaeOrigin: Europe to Turkey, CaucasusMore infos: all parts of these perennial plant are poisonous. USDA zone 6.Related plants:Asarum europaeum