Within the larger context of metamorphoses into plants in Greek and Roman mythology, the paper aims to analyse the myth of Myrrha and her metamorphosis into a tree, focusing on the triggering cause of the transformation as well as the response given to her newly-acquired form of life. Myrrha’s transformation into a myrrh tree takes place as a consequence of her transgressive incestuous act of love with her father, Cinyras. Her metamorphosis occurs as a consequence of sinful passion – passion