The area of Sombor occupies the north-west part of Bačka Plateau. The examined area is mostly an agricultural land, the rest are wood-steppe type and swamps.

On this terrain, 645 wild-growing plants have been described. Among them, we've found 53 poisonous. These are the plants of the almost infrequent Yellow pheasant's eye (Adonis vernalis), through gorgeous Yellow iris (Iris pseudacorus) up to everywhere present Thorn-apple (Datura stramonium). We've found poisonous plants of 30 families. The most numerous, 11 of them, belong to Buttercup Family (Ranunculaceae). Each plant we've termed in Latin and English. Besides, a short description of habitat, poisonous parts of plant, content of toxic substances and related symptoms of intoxication are presented too. The enclosed original photos show the typical terrain around Sombor and some of founded poisonous plants.

The encouraging fact is that in the area where 90.7% of land is agricultural still such a number of wild-growing plants can be found. In this investigation, we've paid attention only to poisonous wild-growing plants.

Key words: poisonous plants, poisonous parts of plants, toxic plant's origin substances, symptoms of plant intoxication.