Acknowledgements
The research was supported by Mahidol University and the Na-tional Research Council of Thailand. We are grateful to the Plant Genetic Conservation Project initiated by Her Royal Highness Prin-cess Maha Chakri Sirindhorn. We are also grateful to the Electricity Generating Authority of Thailand, Srinakarind dam, and the Armed Forces Development Command, Royal Thai Armed Forces, Khao Wang-khamen, for providing facilities and cooperation during field work. We also would like to thank Assist. Prof. Kasem Kulpradit for planning and coordination throughout this project and Mr. George A. Attig for editorial assistance.