Pharmacognostical studies of cistanchis herba (III) phylogenetic relationship of the cistanche plants based on plastid rps2 gene and rpl16-rpl14 intergenic spacer sequences.

The phylogenetic relationship of Cistanche deserticola, C. salsa and C. tubulosa was analyzed by comparing the nucleotide sequences of the plastid rps2 gene and the intergenic spacer region between rpl16 and rpl14.