1. College of Life Science and Technology, Harbin Normal University, Harbin 150025, China
2. Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309, USA
3. University of Michigan Biological Station, Pellston, MI 49769, USA
4. Department of Water Plants Taxonomy and Geography, I.D. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742 Yaroslavl, Nekouz, Borok, Russia
5. Kaluga State University, 248023, Kaluga District, Stepan Rasin Street 26, Russia
6. Institute of Plant Physiology, Russian Academy of Sciences, Botanical Street 35, 127276, Moscow, Russia