Warburgia ugandensis, also known as Uganda greenheart, is a species of evergreen tree native to Africa. The wood is resistant to insect attack and very strong. It was commonly used for the yoke pole of ox-wagons, the Disselboom. Early Indian immigrants to Kenya, working on the construction of the railway, used the leaves to flavor their curries before the chilli plant was commonly introduced. The flavor is fiercely hot and subtly different from chillies.