This species was described by Herb Wagner and Jason Grant (2002) from the interior of Alaska: "It is an allotetraploid of B. lunaria (L.) Sw. x B. lanceolatum (S.G. Gmel.) Ã…ngstr., the same species parentage that gave rise to the morphologically and isozymically distinct B. pinnatum H. St. John." (Wagner and Grant 2002).
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