PolyploidyGenome, PlantEvolution, MolecularPhylogenyDiploidyPloidiesTetraploidyDNA, PlantChromosomes, PlantDirected Molecular EvolutionElymusGossypiumMolecular Sequence DataHybridization, GeneticSequence Analysis, DNAModels, GeneticGenetic VariationSelection, GeneticFernsAsteraceaeSpecies SpecificityGenes, PlantSaccharumTragopogon