Placentation is the arrangement of the ovules in the ovary and their attachment to it. Placentation are of various type in the angiosperms - marginal, axile, central, parietal, basal, and free central.
Image (iii) is free-central placentation and in it the ovules are attached at the central axis of the ovary without any septa present like in axile pattern. Superficial placentation is shown by image (iv) where the placentation occurs in a multicarpellary, multiocular ovary. The ovules develop all round the inner surface of the partition wall and borne on the placentae. In parietal, the ovules are attached to the inner wall or towards the periphery of the ovary, observed in image (ii). Image (i) shows basal placentation where the ovules are attached at the base of the ovary.
