Central Placentation is similar to Axile except that there is only One Locule. The Ovules are attached to a central pilar of tissue but there is only one Locule.
Diagrams of the Three Most Common types of Placentation
Basal Placentation occurs when there is only one to a few Ovules, one Locule and the Placenta is at the base of the Ovary.
Composites offer a good example of Basal Placentation. Each Disk or Ray Flower has one Ovule mature in each Ovary, and that ovule has Basal Placentation.
Diagrams & Photo of Composite Flowers with Basal Placentation