It is a synonym of E. nigrum ssp. asiaticum
Swapped
see: https://powo.science.kew.org/results?q=Empetrum%20nigrum%20var.%20japonicum, https://www.gbif.org/species/4013053, and http://sp2000.org.cn/species/show_species_details/T20201000001299
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see: https://powo.science.kew.org/results?q=Empetrum%20nigrum%20var.%20japonicum, https://www.gbif.org/species/4013053, and http://sp2000.org.cn/species/show_species_details/T20201000001299