| УДК |
Аннотация: The hypothesis was tested that red spruce and black spruce are two distinct species which are capable of hybridizing, and that intrigressive hybridization or introgression has occurred since Pleistocene glaciations. Evidence was obtained from the literature regarding F1 hybrids, isolating mechanisms, and the possible evolution of the species. Data are presented concerning morphological variation of seedlings in provenance tests, and of trees in natural stands. Mosr samples from the overlapping range showed a proportion of individuals typical of one species with other individuals showing a degree of resemblance to the other species. In these latter individuals, character assotiation was evident. While the data are not conclusive, they are compatible with the theory of introgression
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Farrar, J.L.
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