Abstract
(1)Eleven strains of mint which have morphological characteristics of Meletha gentilis were represented by the material used in this research. Ten of them were considered to be identifiable with Mentha gentilis L. f. cardiaca(SM. ) BRIQ. by comparing their characteristics with the textual description of this mint species. (2) Karyological figures and morphological characteristics of the material above mentioned were also compared with those of F1 hybrids (2n=72) between M. arvensis L. var. piperasceles MAL.. (Japanese mint, 2n=96) and M. spicata L. (including var, crispa BENTH.) (2n=48). And it was considered that M. gentilis f. cardiaca must have originated frolorl this crossing, on account of the close resemblance between the two. (table 1 and table 4, fg. I and fig. 6).
