20 of the World's Deadliest Plants

Abrus precatorius (aka Jequirity, Crab's Eye, Rosary Pea)
Abrus precatorius is native to Indonesia, where its vibrant black, red, and white beads are often used in the region's percussion instruments. But the seeds are also highly poisonous on account of their abrin content. Abrin, which is chemically similar to the ricin found in castor seeds (see below), sabotages your body's functions at the cellular level by inactivating ribosomes, the molecular machines in your body responsible for synthesizing proteins. The abrin content of just one seed is said to be fatal to humans.