Phylogenetic relationships among species of Carthamus sect. Carthamus based on single-gene analyses. Neighbor-Joining trees were generated for each individual gene. Species names and accession codes are given in Table 1. Accession names followed by -1 or -2 denote alleles for a given locus. Alleles followed by a * were determined using haplotype subtraction by maximum likelihood; the remainder of the alleles were determined by cloning.