Nicotiana glauca is a species of plant belonging to the Nicotiana genus. This plant is commonly known by different names like tree tobacco, Aztec tobacco, wild tobacco, and South American tobacco. It is a small tree or large shrub that can grow up to 6 meters in height. The leaves of the plant are light green and have a waxy coating, which helps prevent water loss. The flowers appear in clusters at the end of the branches and can range in color from yellow to white. Nicotiana glauca is native to South America but is now widely distributed around the world. It has been used for medicinal and ornamental purposes.