Instead, we found C. cordata when we veered off our planned route for a while and travelled along one of the road leading to Sarawak. We found a carpet of cryptocorynes under one of the many bridges which we passed by. The leaves are dark green, heavily bullated with purplish undersides.
Trekking upstream for a while, we reached a section of the stream where the depth became much shallower and emersed cryptocorynes could be found along the banks. There we found 2 opened spathes to confirm that the cryptocoryne should be C. cordata.
The crypts pages highlighted that 2 varieties of C. cordata could be found in Borneo, one is C. cordata var. grabowskii and the other is C. cordata var. zonata. Comparing the photographs, the emersed spathes of the cryptocorynes we found looked similar in size and appearance to that of C. cordata var. zonata.
However, when we cut opened the spathe, there was no purple coloured kettle walls which supposedly should be a characteristic of C. cordata var. zonata.