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This review focuses on two related outcomes of hybridization sensu lato (i.e. findings from both natural and experimental hybrids are discussed): (1) the production of hybrid genotypes with various fitnesses, and (2) the origin/transfer of adaptations in the Louisiana Iris species complex. Since effects on fitness, and the origin or transfer of adaptations, are of fundamental evolutionary importance, the examples discussed in this review reflect some of the most significant phenomena deriving from the transfer of genetic material via natural hybridization. [ABSTRACT FROM AUTHOR]

Investigates the relative contribution of pollen-tube growth rate and pollen-tube attrition, two prefertilization mechanisms, to the reproductive isolation of Iris fulva and Iris brevicaulis. What studies conducted revealed; Description of methodology used in the study; Analysis of data collected.

Provides information on the study testing of three models of hybrid zone structure experimenting with Louisiana irises. Detailed information on the three models used; Materials and methodology used to conduct the study; Results of the study; Discussion on the results.

Examines the sources of genetic structure in the woody perennial Betula occidentalis in the United States. Identification of the species latitudinal range; Detection of high level gene flow using hierarchical analysis; Adaptive significance of polyploidy and hybridity of the species.