Aconitum ( monkshood) All parts of the plant are highly poisonous. Poison is concentrated in the unripe seed pods and roots. Causes burning, tingling, and numbness in the mouth, then the intestine, followed by vomiting, death by asphyxiation.
Allium (Onions &Garlic) they contain thiosulphate, which in higt doses is toxic to dogs, cats and other livestock.
Asparagus. The berries are poisonous.
Azalea. All parts of the plant are poisonous and cause nausea, vomiting, depression, birthing difficulties, coma. Rarely fatal.
Daphne. A few berries can kill a child.
Delphinium. Contains the alkaloid delsoline. Young plants and sseds are poisonous, causing nausea, muscle twitches, paralysis, often fatal.
Digitalis (Foxglove) The leaves, seeds, and flowers are poisonous, containing cardial ar other glycosides. These cause irregular heatdeat, general digestive upset, and confusion. Can be fatal.
Hedera (Ivy) The leaves and berries are poisonous, causing stomach pains, labored breathing, possible coma.
Holly. Berries causes vomiting, nausea, and diarrhea.
Hyacinth. The bulbs are poisonous, causing nausea, vomiting, gasping, convulsions, and possible death.
Iris. Underground stems are poisonous. Severe, but not usually serious, digestive upset.
Lilies. Most are poisonous, especially to cats.
Lily-of-the-valley. The plant contains cardiac glycosides, as well as saponins. It can cause problems to family pets such as cats and dogs.