Artemisia absinthium: A plant species of the genus ARTEMISIA, family ASTERACEAE that has been used in ABSINTHE. The oil contains neurotoxic 1-thujone and d-isothujone.Artemisia: A plant genus of the family ASTERACEAE with strong-smelling foliage. It is a source of SANTONIN and other cytotoxic TERPENES.Simarouba: A plant genus of the family SIMAROUBACEAE. Members produce quassinoids.Artemisia annua: A plant species of the genus ARTEMISIA, family ASTERACEAE. It is the source of the antimalarial artemisinin (ANTIMALARIALS).