Acioa edulis
Acioa edulis, syn. Couepia edulis Prance, is a fruit and timber tree in the family Chrysobalanaceae, which is native to the Amazon rainforest in Brazil. The tree's Portuguese common name is Castanha-de-cutia. The tree grows naturally only within a small area of Brazil; however, they proliferate widely within this area. The tree is around tall, with entire leaves that are oval or round, measuring diameter, with a petiole up to long. Its fruit ranges from long and diameter. and contain a single nut. Later these nuts float on the waters and have been collected for centuries as the source of a valuable oil, but their source was unknown until 1978 when botanical explorer Ghillean Prance discovered the species of tree which produces them.