A revised taxonomy for the Malesian Cryptocoryne cordata complex with a resurrection to species level of the diploid C. cordata (2n = 34), the tetraploid C. grabowskii (2n = 68), and the hexaploid C. siamensis (2n = 102), and the consequent nomenclatural changes, are here presented. Some members of the C. cordata complex have previously been shown to be involved as parents in naturally occurring hybrids, hence some nomenclatural changes are also made concerning the parents involved in the hybrids.