, in axile placentation, the placenta is axial and ovules are attached to it in a multilocular ovary. Examples explicitly listed include China rose, tomato, and lemon . Furthermore, Petunia is listed as a member of the family Solanaceae , which is described as having axile placentation . In contrast, Mustard has parietal placentation , Primrose and Dianthus have free-central placentation , and Pea and Beans have marginal placentation .