Incongruence length difference (ILD) test [47] implemented in
PAUP 4.0b10 [48] was used to assess the congruence of the data,
between each pair of the seven chloroplast loci, between the exons
and introns of CDS, and between the combined cpDNA and
nuclear CDS data. When the test was conducted between
chloroplast and nuclear DNA, only plant individuals lacking
divergent nuclear haplotypes were used. Because CDS intron
sequences only from the Chrysanthemum, Ajania, and Phaeostigma
species could be aligned, the exons and introns from these samples
were used to perform the ILD test. The test was performed with
1000 replicates, random taxon addition (10 replicates) and