The
strychnine tree (
Strychnos nux-vomica L.), also known as
strychnine tree,
nux vomica,
poison nut,
semen strychnos and
quaker buttons, is a
deciduous tree native to
India, and
southeast Asia. It is a medium-sized tree in the family
Loganiaceae that grows in open habitats. Its leaves are ovate and in size.