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Interspecific Hybridization in the Ranunculus lappaceus Group
Barbara G. Briggs
Vol. 16, No. 3 (Sep., 1962), pp. 372-390
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2406286
Page Count: 19
You can always find the topics here!Topics: Hybridity, Species, Plants, Genetic hybridization, Grasses, Habitats, Population ecology, Ecological genetics, Wetland ecology, Fens
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Evidence of natural hybridization among nine species of the Ranunculus lappaceus group of south-eastern Australia has been obtained from morphological studies of population samples. All the species have similar karyotypes, and natural hybrids show normal meiosis and high fertility. Plants described as R. ligulatus and R. victoriensis appear to be of hybrid origin, the latter being a well-established and partially stabilized hybrid derivative. The species differ in their ecological adaptations, as shown both by field observations and transplant experiments. In general, the hybrids are rigidly restricted to narrow marginal zones between stands of the parental species and this restriction appears to be the principal factor limiting gene flow between species of contiguous areas. The evolutionary flexibility provided by such reliance upon ecological barriers has been discussed.
Evolution © 1962 Society for the Study of Evolution