Screw bean is a plant species that belongs to the Leguminosae family. It is also known as the Tornillo tree, and it is native to the southwestern region of the United States, Mexico, and Central America. This plant grows in arid or semi-arid regions and has a unique coiled-pod structure, which gives it a distinct look. Some of the synonyms for screw bean include the twisted bean, snakewood, spiraled bean, and coiled pod. These synonyms reflect the plant's characteristic helical pods that resemble a twisted spring or corkscrew. Screw bean is an essential plant species for the desert ecosystem, as it provides shelter and food for many desert animals, including birds and insects.