The last decade has witnessed a resurgence in the study of the evolution of plant development, combining investigations in systematics, developmental morphology, molecular developmental genetics, and molecular evolution. The integration of phylogenetic studies, structural analyses of fossil and extant taxa, and molecular developmental genetic information… (More)
Fig. 4. Evolution of leaves. A minimum of three evolutionary origins of leaves are inferred in the gametophyte generation. One origin is among complex thalloid liverworts, another in simple thalloid liverworts, and a third in the common ancestor of extant mosses. Three evolutionary origins are also inferred in the sporophyte generation. One origin is in Lycopsida, another in the moniliformopses, and a third in the common ancestor of seed plants and Archaeopteridales.