Caltha palustris – marsh marigold, is a plant that, before blooming, is harmless and it can be consumed, by both animals and people. After blooming, it is poisonous and its toxicity increases as she becomes more mature. The animals avoid consumption, eating it only in case of extreme hunger. Dry, it is much more toxic. The harm is caused by the content of helleborin glucoside and jervine alkaloid. The symptoms of poisoning are: haemoglobinuria, mouth irritation, drooling abundance, diarrhea.