- Outdoor garden
Poison sumac (Toxicodendron vernix). All parts of the plant contain a resin called urushiol that causes skin and mucous membrane irritation to humans. Poison sumac is far more virulent than poison ivy.
Photo: Jardin botanique de Montréal (Robert Mineau)

Red baneberry (Actaea rubra). The entire plant, including the berries, is highly toxic to humans
Photo: Jardin botanique de Montréal (Isabelle Dupras)

Poison hemlock (Conium maculatum). The entire plant is highly toxic and can cause fatal poisoning
Photo: Jardin botanique de Montréal (Gilles Murray)

Wild parsnip (Pastinaca sativa). The sap of wild parsnip contains furanocoumarins which cause skin reactions aggravated by exposure to the Sun's rays
Photo: Jardin botanique de Montréal (Gilles Murray)
