SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Castor Oil Plant (Ricinus Communis) growing in the Botanical Gardens in Siena, Italy. This plant is widely used for medicinal purposes, particularly as a laxative. Raw castor beans contain ricin and are poisonous to animals and humans when broken seeds are ingested. Ricin has been investigated as a potential insecticide. The plant also contains undecylenic acid which is a natural fungicide.
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