Abstract
Three kinds of karyotype, A, B, and C, were found in apopulation of Heterotropa hexaloba F. MAEKAWA. The karyotype A was composed of 11 pairs of metacentric chromosomes (Nos. 1 - 11) and a pair of small submetacentric SAT-chromosomes (No. 12). The karyotype B differedfrom the karyotype A in the presence of a heterozygous intercalary satellite on the long arm of chromosome 8. The karyotype C was different from karyotype A with respect to a heterozygous pair of chromosome 2 composed of metacentric and subtelocentric chromosomes. Karyotype A was the most frequent in the population and must be a standard type. Plants with karyotype A were randomly found, but those with karyotypes B and C were growing in a limited part of the mapping area. The distribution patterns of different karyotypes might be explained by self-pollination and ant seed-dispersal.
