Washers are also known as Olum, Bobimbi, Country-Onions. These hazelnuts have an oval shape, hence its name rondelle.

From a tropical forest plant, they are dried after picking, and its husk and removed before use.

In Cameroon they are used as a condiment and in traditional medicine. Its aroma is powerful and pleasant, slightly similar to that of garlic, hence its name garlic tree. In Cameroon its fruits or rings, as well as its bark or Olum, are used in cooking in the preparation of dishes such as "Yellow sauce", "Mbongo", "Nkui", yellow sauce, nkwem without salt, pepper soup etc ...