A large broad-leafed evergreen tree, Bertholettia excelsa, that grows wild in the forests of the Amazon valley of Brazil and Bolivia. The fruit is a spherical capsule, 3–6 in. (7.5–15 cm) in diameter and weighing 2–4 lb (0.9–1.8 kg) which, when mature, consists of an outer hard indehiscent husk about ½ in. (1.2 cm) thick enclosing an inner hard-shelled container or pod filled with about 20 rather triangular seeds or nuts.