What does dieffenbachia contains?

i am a little bit confused because i wonder what it contains why if it eaten, it can kill people or even animals?

What does dieffenbachia contains?
Dieffenbachia is a genus of tropical plants in the Family Araceae noted for their patterned leaves. Members of this genus are popular as houseplants because of their tolerance to shade. The Dieffenbachia is often referred to as the "King of Plants".





The cells of the Dieffenbachia plant contain needle-shaped calcium oxalate crystals called raphides. If a leaf is chewed, these crystals cause a burning sensation in the mouth and throat; swelling can occur along with a temporary inability to speak, and from this effect the plants are commonly called dumb cane (other names include Galatea and Leopard Lily). Chewing could result in death if swelling of the throat blocks the airway. Slaves were supposedly sometimes punished by having dieffenbachia put into their mouths . Young children (at the age where they regularly put things into their mouths) are at risk of suffocation and death if they eat or chew on Dieffenbachia leaves. Some cats eat houseplants and flowers; they are similarly at risk.
Reply:The Dieffenbachia contains a toxic sap thus giving the name Dumb Cane, ... It does not require a lot of care, yet adds a beautiful touch to your home. ...