Many plants produce milky sap that contains toxic compounds as a defense mechanism against herbivores.
Various species of Euphorbia, such as Euphorbia marginata and Euphorbia tirucalli, produce a toxic milky sap that can cause skin irritation and is toxic if ingested.
Oleander is a highly toxic plant that contains toxic compounds in its milky sap, including oleandrin. All parts of the plant are poisonous if ingested.
The castor bean plant contains ricin in its milky sap, which is a highly toxic protein. Ingesting even a small amount of ricin can be lethal.
Also known as the sandbox tree, it produces a toxic sap that can cause skin irritation and is harmful if ingested.