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I don't understand how it can be native both to Asia and to the United States. Was it introduced somewhere at some time? Milkfish (talk) 01:24, 16 June 2020 (UTC)
- Dozens of species have a circumpolar distribution. Asia and North America are practically joined, only separated by about 83km.Plantsurfer 09:49, 16 June 2020 (UTC)