are diploid species (Table 1 & reference [12]), and C. naktongense
has various ploidy levels (2x to 4x and 6x) (Table 1). The
population ZJ of C. naktongense that is clustered with C. arisanense
and close to C. sinuatum is diploid. These three species are
morphologically distinct and geographically separated. C. sinuatum
is a narrowly distributed species only in Altai, Russia [12].