In nearly all cases, each species’ closest relatives occur in a similar niche on a different island
More so than reproductive or anatomical features, morphology defines evolutionary relationships among early vascular plants.
Huang et al. propose that whole genome duplication events serve as a constant pump for continuous and high species diversification.
Did the Cyatheaceae become such a diverse family slowly over time, or in spurts? The largest molecular sampling yet points to gradual accumulation of species.
Normally you would expect organs to change across evolutionary time. However, this is not always the case, and some clades can be species-rich, but still have very similar flowers.
Aridification has been a major force in cycad evolution, says José Said Gutiérrez-Ortega. It helps to explain why cycads were capable to adapt and diversify in the modern habitats, even when they originated in the early evolution of land plants.
This study explores phloem evolution in the species-rich Bignonieae (Bignoniaceae) tribe.
Freudenstein and Chase analyse seven loci from 310 genera of epidendroids and find increased resolution and support for many groups.