Journal Article Quercus Research Support, Non-U.S. Gov't phylogenomics American oaks Research Support, U.S. Gov't, Non-P.H.S. anchored hybrid enrichment ancient introgression convergence diversification rates gene flow genomic mosaicism hybridisation introgression niche evolution oaks phylogenetic network phylogeny restriction site-associated DNA sequencing (RAD-seq) restriction-site associated DNA sequencing (RAD-seq) sympatric parallel diversification tree diversity white oaks woody plants