Journal Article Research Support, Non-U.S. Gov't 7631-86-9 Arabidopsis Chrysophyceae GC content Mallomonas Ornstein-Uhlenbeck models Silicon Dioxide V-rib bristle dome evolution flow cytometry genome duplication genome size hybrid seed incompatibility hybrid zones interspecific competition orchids partial endoreplication phenotypic evolution phylogenetic comparative methods phylogeny ploidy coexistence polyploid establishment polyploidy reproductive isolation serpentine silica scales