Acknowledgement
This study was supported by a research project (A survey on the vascular flora of Mongolia; Grant Number KNA 1-2-38, 20-5) of the Korean National Arboretum, South Korea, and partly supported by the National University of Mongolia's Seed Grant. We thank Mr. E. Choijilsuren, who found the first locations of this species in Mongolia, for providing valuable information. The authors are grateful to two anonymous reviewers and David Boufford (Harvard University Herbaria) for their critical reading of the manuscript with valuable comments.
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