European Birthwort / Žuta vučja stopa

It was formerly used as a medicinal plant, though it is poisonous, and is now occasionally found established outside of its native range as a relic of cultivation. It is now known to be the cause of thousands of kidney failures in Romania, Bulgaria, Serbia, Bosnia and Herzegovina and Croatia where the plant is unintentionally consumed through contaminated flour. Urinary tract malignacies among those who have consumed the plant are also reported. The link with the plant's content of aristolochic acid was discovered after a clinic for obesity in Belgium used herbal products based on another plant of the same genus as a diuretic. After a few months, some of the patients experienced kidney failure.