Serial cross sections of an ovary of Begonia guixiensis Yan Liu, S.M. Ku & C.-I Peng. A, The tip of cavity; B, Near the tip: three parietal placentae; C, Upper part: three placentae fused in the center but with three separate vascular bundles, forming gaps between placental branches; D, Upper-middle ovary: placental branches fusing on the sides; E, F, middle to lower ovary: vascular bundles united and assuming a 3-locular appearance. All from Peng et al. 20310.