Plant Diversity and Evolution

Flowering plants — angiosperms — make up roughly 90 percent of all plant species on Earth, and understanding how they diversified from a single common ancestor into this vast array of forms is one of biology's central challenges. Researchers use molecular phylogenetics, combining DNA sequence data with fossil evidence and geographic records, to reconstruct the evolutionary relationships among plant lineages and trace how and where major groups first appeared and spread. A key open question is what drove the exceptionally rapid early diversification of angiosperms, a puzzle Darwin himself called an "abominable mystery," with current work examining factors like pollinator co-evolution, genome duplication, and shifts in developmental timing. At the same time, ongoing efforts to stabilize plant taxonomy — deciding which groups truly constitute natural lineages — continue to revise classifications as new molecular data challenge long-held assumptions based on physical traits alone.

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Keywords

Angiosperm PhylogenyFlowering PlantsBiogeographyDiversificationPhylogeneticsEvolutionary History