Poisonous plants, plants that produce and accumulate in the vital activity of poisons. Cause poisoning of animals and humans. The world knows the flora of more than 10 thousand species Ya pp., Mainly in tropical and subtropical regions, many of them in countries of temperate and cold climates, and in Russia about 400 species. J. pp. occur among the fungi, horsetails, club mosses, ferns, gymnosperms and angiosperms. In countries of temperate climate most commonly they are represented in the family Ranunculaceae, poppy, Euphorbiaceae, Asclepiadoideae, Apocynaceae, Solanaceae, Fig-wort, Araceae. Many plant poisons in small doses - valuable therapeutic agents (morphine, strychnine, atropine, physostigmine, etc.).
The main active substances Ya pp. - Alkaloids, glycosides (including sapon