1975 Volume 50 Issue 4 Pages 345-352
Analyzing the patterns of H-segments revealed in the cold treated chromosomes, Trillium×yezoense Tatewaki hyb. (2n=15, K1SU) was reconfirmed to be the natural hybrid between T. kamtschaticum Pall. (2n=10, K1K1) and T. apetalon Makino (2n=20, SSUU). Chromosomal polymorphism of the two parental species made the hybrid plants naturally chromosomally polymorphic. In reality, three hybrid plants from a single locality were different from one another in their chromosome constitutions. Pattern of H-segments of the chromosome complement of T.×miyabeanum Tatewaki hyb. (2n=20, K2TSU) was composite one of those of T. apetalon and T. tschonoskii Maxim. (2n=20, K2K2TT). All the ten hybrid plants ananlyzed were different from one another in their chromosome constitutions.