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Chromosomal Differentiation and the Sources of the South American Species of Epilobium (Onagraceae)
Steven R. Seavey and Peter H. Raven
Journal of Biogeography
Vol. 4, No. 1 (Mar., 1977), pp. 55-59
Published by: Wiley
Stable URL: http://www.jstor.org/stable/3038128
Page Count: 5
You can always find the topics here!Topics: Ravens, Species, Hybridity, Biological taxonomies, Plants, Chromosomes, Evolution, Genera, Genomes, Reciprocal translocation
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An analysis of chromosome pairing in thirty-four artificially produced hybrids involving seven South American species of Epilobium (Onagraceae) and three from elsewhere has shown that the approximately thirty-five species of this worldwide genus on that continent have been derived from at least two separate introductions from North American, two from Australasia, and one or more additional introductions that could have been from either source. The species derived from North America have the AA chromosome arrangement, and most of the others the BB arrangement, which differs from AA by the one reciprocal translocation. The south American population of E. hirtigerum examined had a chromosome arrangement that differed from BB by one reciprocal translocation, from AA by two. In addition to these species, there are at least two others introduced into South America by man, one from North America and one from Europe.
Journal of Biogeography © 1977 Wiley