An updated synopsis of Ludwigia (Onagraceae) in Malesia.
A synopsis of the seven native or naturalised species of Ludwigia (Onagraceae) occurring in Malesia is presented. The newly established Ludwigia leptocarpa is included. The paper incorporates a key to the species, synonymy and typification. Lectotypes are designated for 25 names, including five at the second step.