Ludwigia hexapetala (Hook. & Arn.) Zardini, H.Y. Gu & P.H. Raven Ludwigia hexapetala (Hook. & Arn.) Zardini, H.Y. Gu & P.H. Raven in Syst. Bot. 16(2): 243. 1991 sec. Wagner & al. 2007