Figure 21.2.A Diagram illustrating the basic types of placentation. A, E, longitudinal sections of individual carpels, in which there are two longitudinal rows of ovules (A), or one ovule attached basally (E); B, C, transverse sections of gynoecia with fused carpels; D, free central type placentation seen in transverse and longitudinal section. [B—E redrawn from Plant Taxonomy by E. L. Core. Prentice Hall, Englewood Cliffs, N.J. 1955.] (Figure from: Gifford and Foster, 1989. Morphology and Evolution of Vascular Plants, Third Edition, W. H. Freeman.)