Species: Adiantum pedatum

Plantae - Filicinophyta - Filicopsida - Filicales - Pteridaceae - Adiantum - This was once believed to be a single species that occurred with taxonomic variation in a wide range of natural community types, and occurred in eastern Asia and throughout much of North America. Now these populations are viewed as three species in North America alone: A. aleuticum which occurs from Alaska down into Mexico, with a few disjunct populations scattered from Newfoundland to Maryland (primarily or exclusively on serpentine); A. pedatum which occurs in forests in the approximate eastern half of the U.S.; and A. viridimontanum, an allopolyploid species arising from A. aleuticum and A. pedatum (Flora of North America Editorial Committee 1993, Gleason and Cronquist 1963), which is confined to Vermont and Quebec according to Kartesz (1999).