Placentation : arrangement of ovules within the ovary is known as Placentation.
- Marginal: Placenta forms a ridge along the ventral suture of ovary.
- Axile: Margins of carpels fuse to form central axis.
- Parietal: Ovules develop on inner wall of ovary.
- Free central: Ovules borne on central axis, lacking septa.
- Basal: Placenta develops at the base of ovary.