What are examples of some common outdoor plants that contain poisonous parts?

Answer 1

Buttercup, castor bean, daffodil, English ivy, eucalyptus, foxglove, holly, horse chestnut, iris, Jack-in-the-pulpit, larkspur, morning glory, potato, oleander, tomato, yew, wisteria, sweet pea, rhubarb.

Answer 2

Poison by contact or poison by consumption are the two main categories within which poisonous plants fall.

A good example of the two poisonous possibilities in one plant may be seen in poison ivy (Toxicodendron radicans). All parts of the plant contain urushiol oil. Interaction with that oil is harmless for wildlife. It can be uncomfortable, painful or downright fatal for people.

Specifically, contact with the oil occurs by brushing against the plant and breaking open the stem, for example. Consumption occurs when the plant is burned and its toxic particles thereby are caught up in the area's air circulation. Either way, particles that come in contact with any part of the head or the respiratory system provoke a medical emergency. The situation is so critical that unless given proper medical care, the patient may die from the body's reaction to the urushiol particles in the air.