The Phylogeny of Calligonum and Pteropyrum (Polygonaceae) Based on Nuclear Ribosomal DNA ITS and Chloroplast trnL-F Sequences

This study represents phylogenetic analyses of two woody polygonaceous genera Calligonum and Pteropyrum using both nrDNA ITS and trnL-F sequence data. All inferred phylogenies using both parsimony and Bayesian methods show that Calligonum and Pteropyrum are each monopyletic and closely related taxa. They have no affinity with Atraphaxis, instead allied with a clade in which the genus is nested. In contrast to Pteropyrum, infrageneric relationships in Calligonum, due to the paucity of informative nucleotide sites in both DNA regions are not resolved.