The strychnine tree (Strychnos nux-vomica L.) also known as nux vomica, poison nut, semen strychnos, Liz Vomica and quaker buttons, is a deciduous tree native to India, southeast Asia. It is a medium-sized tree in the family Loganiaceae that grows in open habitats. Its leaves are ovate and 2–3.5 inches (5.1–8.9 cm) in size.
It is a major source of the highly poisonous alkaloids strychnine and brucine, derived from the seeds inside the tree's round, green to orange fruit. The seeds contain approximately 1.5% strychnine, and the dried blossoms contain 1.0%. However, the tree's bark also contains brucine and other poisonous compounds.
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