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- W2325249239 abstract "Two interspecific hybrids were added as supplements to the genus Trillium in Japan. The parentages were confirmed cytologically, with the aid of differential reaction in chromosomes. The chromosome number, genomic constitution and parentage of these hybrids are tabulated as follows:The isolation mechanisms separating the parental species were examined. It was shown that there were differences among them in respect to flowering time and some ecological characters.These differences were more conspicuous between T. kamtschaticum and T. smallii than between T. tschonoskii and T. smallii. Hybridization occurred in localities where these external barriers were removed or reduced. These parental species were completely isolated, however, by an internal barrier, viz., chromosomal sterility, and the hybrids produced no progeny in nature.The external morphology of the hybrids was generally intermediate between their parents. One of the parents, T. smallii, is an apetal species, and others had three petals. The number of petals of the hybrids varied from three to zero. The reduction of petal number was often accompanied by staminody.The process of speciation of Japanese Trillium previously proposed by Haga (1951) was partly rewritten adding the two newly found hybrids. At the same time, a modification was made in the scheme of evolutionary sequences of chromosome doubling, on the assumption that the doubling is conditioned by the pre-existence of sterile hybrids." @default.
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- W2325249239 date "1957-01-01" @default.
- W2325249239 modified "2023-09-27" @default.
- W2325249239 title "Evolution and Variation in <i>Trillium</i>" @default.
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- W2325249239 doi "https://doi.org/10.1508/cytologia.22.263" @default.
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