▪ Abstract Floral evolution has often been associated with differences in pollination
syndromes. Recently, this conceptual structure has been criticized on the grounds that …

Whether interspecific hybridization is important as a mechanism that generates biological
diversity is a matter of controversy. Whereas some authors focus on the potential of …

Phylogeography is a discipline concerned with various relationships between gene
genealogies—phylogenetics—and geography. The word “phylogeography” was coined in …

Adaptive radiation is the evolution of diversity within a rapidly multiplying lineage. It can
cause a single ancestral species to differentiate into an impressively vast array of species …

One view of pollination systems is that they tend toward specialization. This view is implicit in
many discussions of angiosperm evolution and plant—pollinator coevolution and in the long …

Chloroplast DNA sequences are a primary source of data for plant molecular systematic
studies. A few key papers have provided the molecular systematics community with …

Directional evolutionary trends have long garnered interest because they suggest that
evolution can be predictable. However, the identification of the trends themselves and the …

The family Ranunculaceae, a member of early-diverging eudicots that is increasingly being
used as a model for the study of plant developmental evolution, has been the focus of …

Recent models and analyses of paleoecological records suggest that tree populations are
capable of rapid migration when climate warms. Fossil pollen is commonly interpreted as …

Molecular data have had a profound impact on the field of plant systematics, and the
application of DNA-sequence data to phylogenetic problems is now routine. The majority of …