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

Diploid hybrid lineages often are ecologically distinct from their parental species. However, it
is unclear whether this niche divergence is typically achieved via hybrid intermediacy, a …

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 …

The proportion of loci deviating from the expected monogenic segregation ratios in the
genera Lens. Capsicum, and Lycopersicon is significantly higher (61/114 genes, 54%) for …

The flowering plants comprise some 250,000 species and are tremendously diverse in
growth habit, environmental adaptation, and nuclear genome structure. Plant genomes tend …

Ecology affects each of the three principal processes leading to speciation: genetic
differentiation among populations within species, acquisition of reproductive isolation …

Hybridization is an important evolutionary mechanism in plants and has been increasingly
documented in animals. Difficulty in reconstruction of reticulate evolution, however, has …

The origin of new diploid, or homoploid, hybrid species is associated with rapid genomic
restructuring in the hybrid neospecies. This mode of speciation has been best characterized …

Below the level of what is commonly accepted as the species in sexual organisms there may
be no phylogeny, only reticulate relationships (tokogeny) among individuals. The …

The identification and study of adaptively important genes in forest trees represents a
formidable challenge because of their long generation spans. In annual or perennial herbs …