Northern America: Subarctic America (AlaskanativeA), United States of AmericanativeA,B
Bibliografía
A.POWO 2019: Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://www.plantsoftheworldonline.org/. Plants of the World Online
B.Govaerts, R. (Ed.) 2013: WCSP: World Checklist of Selected Plant Families