1. Komarov Botanical Inst., Russian Academy of Science; Prof. Popov Str. 2 RU-197376 St Petersburg Russia
2. Center for Plant Conservation; no. 25/32, lane 191, Lac Long Quan, Nghia Do, Cau Giay District, Ha Noi Vietnam
3. Inst. of Ecology and Biological Resources, Vietnam Academy of Science and Technology; 18 Hoang Quoc Viet, Cau Giay, Ha Noi Vietnam
4. Key Laboratory of Plant Resources Conservation and Sustainable Utilization; South China Botanical Garden, Chinese Academy of Sciences; Guangzhou 510650 PR China
5. National Univ. of Laos, Faculty of Science; Dept of Biology; Dong Dok, PO Box 7322, Vientian LAO PDR
6. National Science Council Dept; National Herbarium of Laos
7. Hanoi Univ. of Science; 334 Nguyen Trai, Thanh Xuan, Hanoi Vietnam