Selbyana 26(1,2): 196-216. 2005. MOLECULAR IDENTIFICATION OF CYPRIPEDIOID ORCHIDS IN INTERNATIONAL TRADE CHERYL L. MORRISON* U.S. Geological Survey, Biological Resources Division, Leetown Science Center, Aquatic Ecology Branch, 11649 Leetown Road, Kearneysville, WV 25430 USA. Email:
[email protected] KATIE HOVATTER United States Department of Agriculture, National Center for Cool and Cold Water Aquaculture, 11876 Leetown Road, Kearneysville, WV 25430 USA. MIlm EACKLES, ADRIAN P. SPIDLE, AND TIM L. KING U.S. Geological Survey, Biological Resources Division, Leetown Science Center, Aquatic Ecology Branch, 11649 Leetown Road, Kearneysville, WV 25430 USA. ABSTRACT. Two cypripedioid orchid genera, Paphiopedilum and Phragmipedium, are listed in Appendix I of CITES and are restricted from international trade. Because of their morphological similarity to other genera, however, they may be disguised as belonging to one of the other cypripedioids listed along with other orchids in Appendix II of CITES. Sequence analysis was performed on the internal transcribed spacer region (ITS) of ribosomal DNA of cypripedioid orchids to develop a molecular marker system capable of discriminating among rare species in trade. Molecular analyses concentrated on rare cypripedioid orchids from the genera Paphiopedilum and Phragmipedium, which are known to be poached from the wild and smuggled across international borders disguised as common species. A total of 48 taxa representing two genera (Paphiopedilum, N = 43; Phragmipedium, N = 5) have been sequenced and compared for distinc tiveness. Phylogenetic analyses clearly distinguish between these two genera and among other cypripedioid genera, with 5-10 fixed nucleotide differences reported between genera. Within a genus, sections of closely related taxa are recoverable in phylogenetic analyses, in most cases, with low sequence divergence within sections.