What is the flower? Describe the parts of a typical angiosperm flower.
The placentation of flowering plants is the distribution of ovule-bearing cushions or placentae inside the ovary. It is of the following types. Marginal. A monocarpellary unilocular, ovary bears ovules longitudinally along the ventral suture in one or two alternate rows, e.g., Pea. Parietal. A syncarpous, unilocular ovary bears two or more placentae longitudinally along the wall, e.g., Fumaria, Viola. A false septum occurs between two parietal placentae in the Mustard. It makes the ovary falsely bilocular. In cucurbits, the three parietal placentae grow inwardly, meet in the centre and bend outwardly The ovary becomes trilocular. Axile. A syncarpous bilocular to multilocular ovary bears ovules on the central axile column where the septa meet, e.g., China rose, Petunia, Asphodelus. Free central. Polycarpellary syncarpous but unilocular, ovary bears ovules around a central column which is not connected to the ovary wall. Basal. Unilocular ovary bears a single ovule from the basal region, e.g., Ranunculus, Sunflower. Apical. Unilocular ovary bears a single ovule from the apical region, e.g., Cannabis. Superficial. Ovules are borne along the inner surface of the ovary including the septa if present, e.g., Butomus (unilocular), Nymphaea (multilocular).
