Hybrid speciation refers to the establishment of novel hybrid genotypes that are
reproductively isolated from their parental species and genetically stabilized. Most …

Hybrid or “recombinational” speciation refers to the origin of a new homoploid species via
hybridization between chromosomally or genetically divergent parental species. Theory …

New species may arise via hybridization and without a change in ploidy. This process,
termed homoploid hybrid speciation, is theoretically difficult because it requires the …

Sunflowers of the genus Helianthus are models for hybridization research and contain three
of the best-studied examples of homoploid hybrid speciation. To understand a broader …

Abstract.—Reproductive barrier formation between newly derived hybrid taxa and their
parental species represents a major evolutionary hurdle. Here, I examine the development …

Hybridization is frequent in many organismal groups, but its role in adaptation is poorly
understood. In sunflowers, species found in the most extreme habitats are ancient hybrids …

This study aims to identify selection pressures during the historical process of homoploid
hybrid speciation in three Helianthus (sunflower) hybrid species. If selection against intrinsic …

Although there are many studies of the evolution and ecology of hybrid zones, few extend
over long enough time periods to track evolutionary changes in the zones or assess the …

Genetic architecture may profoundly influence the ability of adaptive traits to spread between
species via introgressive hybridization. Here, we examine the genomic location of …

This article reviews past successes and future potential of the use of interspecific hybrids in
the breeding of cultivated Helianthus annuus, with emphasis on the necessity for …