Bertholletia Bonpl.

Canopy to emergent trees. Leaves scattered along branches, medium to large-sized (17-36cm long), glabrous; venation not markedly percurrent. Inflorescences terminal or axillary, spicate or once-branched paniculate arrangements of spikes, growth of rachises determinate. Flowers present with leaves, zygomorphic; sepals 2 at anthesis; petals 6, flat at apices; staminal lip present; androecial hood swept inward but not coiled, bearing vestigial stamens, the stamens not reflexed, the anthers laterally dehiscent; ovary usually 4-locular, 16-25 ovules per locule, attached at base of septum, the style relatively long, geniculate, without stylar collar. Fruit dehiscent but opening smaller in diameter than seeds, dropping from tree at maturity with seeds inside, globose, pericarp thick. Seeds not winged, the testa hard, glabrous; cotyledons absent; embryo macropodial.