Abstract
On the bases of a series of studies on karyotypes, chromosome pairing and external characters, the genomic constitutions of all the Japanese members of the genus Trillium were suggested as follows:
Plant Chromosome Genom
number pairing
T. kamtschaticum 2x=10 5II K1K1
T. Hagae 3x=15 5II+5I K1K2T
T. Hagae 6x=30 15II K1K1K2K2TT
T. Tschonoskii 4x=20 10II K2K2TT
T. Smallii 4x=20 10II SSxx
T. ainabile 6x=30 15II KKSSxx
In the above tabulation, x represents a genom undefined as yet. K1 and K2 are genoms highly homologous, but not identical, at least, chromosome morphologically. These two genoms are comprised by an collective symbol K, when the distinction between them is not necessary in description or is not definitive in the present status of investigation.
The writer wishes to express his gratitude to Professor H. Matsuura of Hokkaido University for his valuable suggestions in the course of the work. Expense of the present work was partly defrayed by a Grant in Aid for Fundamental Scientific Research of the Ministry of Education.
