a formation in a flower of a unicellular pistil and, thereby, of a fruit, which has a central, or columnal, placenta. The carpels grow together early in the placenta with their edges turned in, while their side walls are destroyed, or undergo lysis. The floral disk, which is located between the edges of the carpels in the center of the ovary, is sometimes included in the process. This formation is encountered in the primrose family, some pinks, leadworts, buckwheats, and other dicotyledonous plants.
REFERENCESTakhtadzhian, A. L. Morfologicheskaia evoliutsiia pokrytosemennykh. Moscow, 1948.
Eames, A. Morfologiia tsvetkovykh rastenii. Moscow, 1964. (Translated from English.)