1. Corresponding author. Missouri Botanical Garden, Post Office Box 299, St. Louis, MO 63116, USA ( ) jan.salick@mobot.org
2. Central Department of Botany, Tribhuvan University, Post Box 26429, Kirtipur, Kathmandu, Nepal ( ) sureshkghimire@yahoo.com
3. Shangri-La Alpine Botanical Garden, 21 Heping Road, Shangri-la County, Diqing Prefecture, Yunnan 674400, China ( ) zhendong.fang@gmail.com
4. National Biodiversity Centre, Ministry of Agriculture and Forests, Post Box 875, Serbithang, Thimphu, Bhutan ( ) sdema06@gmail.com
5. Missouri Botanical Garden, Post Office Box 299, St. Louis, MO 63116, USA ( ) katie.konchar@gmail.com