Placentation – Arrangement of ovule within the ovary is known as placentation. Various types of placentations found in flowering plants are
(1) Marginal placentation
The placenta forms a ridge along through the ventral suture of the ovary, ovules are borne on the ridge to form two rows.
(2) Axile placentation
The placenta is axial and ovules are attached to it in a multilocular ovary.
(3) Parietal placentation – Ovules develop on the inner wall of the ovary or on the peripheral. It is single-chambered, but due to the formation of a false septum, it becomes two-chambered.
(4) Basal placentation – Placenta develops at the base of the ovary wherein a single ovule is attached to it.
(5) Free central placentation – Ovules are borne on the central axis and septa are absent