A–C Aristolochia pseudoutriformis X.X.Zhu & J.S.Ma, sp. nov. A leaves B flower (lateral view) C opened flower (showing the inside structure). D–F A. utriformis S.M.Hwang D leaves E flower (lateral view) F opened flower (showing the inside structure). G–I A. forrestiana J.S.Ma G leaves H flower (lateral view) I opened flower (showing the inside structure). J–L A. yangii X.X.Zhu & J.S.Ma. J leaves K flower (lateral view) L Opened flower (showing the inside structure). Photographed by Xinxin Zhu (A–C, G–L); Photographed by Lei Cai (D–F).