Phylogeny of the StH genome species in Triticeae (Poaceae): Evidence from chloroplast trnL-F and mitochondria COXII intron sequences

► The trnL-F and COXII intron sequences of 16 StH genome species were analyzed with those of putative diploid donor species. ► The trnL-F and COXII sequence may evolve faster in the polyploid species than in the diploids. ► The COXII has a high evolutionary rate compared to trnL-F sequence. ► Different St genome donor might serve as the maternal donor during the polyploid speciation. ► Phylogenetic relationships of the StH genome species may be not linked with the inter-continental disjunction between Eurasia and North America.