Cajanus Cajan is a legume plant commonly known as pigeon pea or red gram. There are several synonyms for this plant, including Cajanus indicus, Cajanus flavus, and Cajanus bicolor. The plant is native to Africa but has spread to other regions worldwide, including Asia and the Americas, due to its nutritional and medicinal properties. The plant is known for its rich protein content, fiber, and various minerals such as potassium, phosphorus, iron, and zinc. Pigeon pea is often used in traditional medicine to treat fever, coughs, and various respiratory conditions. The plant is also important in agricultural practices due to its nitrogen-fixing properties, which improve soil fertility and crop yield.