The species category marks the boundary between systematics and population biology,
hence a clear understanding of species is critical for both these fields and their …

▪ Abstract The study of natural plant populations has provided some of the strongest and
most convincing cases of the operation of natural selection currently known, partly because …

The importance of genome size, as a useful taxonomic marker, has been stressed in many
studies based on different groups. A critical appraisal of intraspecific variability reported in …

Phylogeny reconstruction has become respectable science over the last few decades, and
trees are accumulating rapidly in the literature. Botanists have been active in this effort and …

Phylogenetic analyses of DNA sequences have prompted spectacular progress in
assembling the Tree of Life. However, progress in constructing phylogenies among closely …

Hybrids between flowering plant species often exhibit reduced fitness, including sterility and
inviability. Such hybrid incompatibilities create barriers to genetic exchange that can …

Hybridization is an important part of the evolutionary history of flowering plants. If
hybridization has occurred among the species of a taxon under cladistic analysis the results …

Premise of the Study Discordant gene trees are commonly encountered when sequences
from thousands of loci are applied to estimate phylogenetic relationships. Several processes …

Flowering plants represent the most significant branch in the tree of land plants, with respect
to the number of extant species, their impact on the shaping of modern ecosystems and their …

Although approximately 150 years have passed since the publication of On the origin of
species by means of natural selection, the definition of what species are and the ways in …