Study on orchid identififif ication of genus Dendrobium to monitor and control wild populations which impact by exportation in compliance with the Plant Act B.E. 2518

Abstract

Dendrobium orchids were listed as conserved plant under the Plant Act B.E. 2518 and Appendix II in CITES Convention as well. According to the both Regulations, it is need to monitor and control of international trade to ensure that the population of this genus in the nature, are not impacted by that trade. Therefore, population survey of Dendrobium in distribution areas and monitor at border markets were studied. Most of orchid plants were traded in non-blooming plant, to facilitate the competent officers to regulate import and export. Dendrobium morphology was studied form specimens which found in nature, nurseries and disputed orchids during October, 2008 to September, 2009. The survey of Dendrobium from nature were found 45 species. At border markets 62 species were found and 6 of them are rare and endangered species, as Dendrobium albosanguineum Lindl. & Paxton, Dendrobium chrysanthum Wall. ex Lindl., Dendrobium falconeri Hook., Dendrobium garettii Seidenf., Dendrobium peguanum Lindl. and Dendrobium wardianum R.Warner. The study of Dendrobium morphology in non-blooming plants found 10 groups of pseudobulb shapes which are used to identify Dendrobium orchids. The group of pseudobulb areas follows; flat linear, flat/lateral compress, swollen nodes/contricted node, cylindrical, clavatelike, ovate to globose, fusiform,pseudobulb like, square, and unique/distinct pseudobulb.