Placentation as seen in ovary cross-sections of Bertholletia excelsa.

Placentation of Bertholletia excelsa as shown in cross-section  based on Freitas 511 from Amazonas, Brazil. A. Looking from the base toward the apex of the ovary. Note that ovules are attached above this point. B. Looking from the apex toward the base of the ovary. The round cap in the center was lifted without tearing it away from other tissue to reveal the view seen in the next image. C. View same as in B. Note this view shows the top of the placenta and the uppermost ovules attached to it. D. Close-up of C. Note the broadly triangular shape of the placentae which arise at the ends of the septa. E. An apical view of the very base of the locules, i.e., of an ovule-free area below the placentae. The locule number of four is relatively consistent in this species.