The narrow-leaved Cryptocoryne crispatula Engl. from the far eastern Thailand has proven to be different from the Vietnamese C. crispatula Engl. var. tonkinensis (Gagnep.) N. Jacobsen. It is characterized by having the most narrow leaves within C. crispatula, and a spathe with a very short tube and a long, conspicuously spirally twisted limb. It is here described as a new variety: Cryptocoryne crispatula Engl. var. kubotae N. Jacobsen & Bastmeijer, var. nov.