As classified in WFO snapshot
June 2023
Warning: older classification
variety
Phegopteris alpestris var. americana
(Butters) Jeps.
This variety name was first published in Man. Fl. Pl. Calif. [Jepson] 29. 1925 , as 'var. americanum'
This variety name has been reclassified since this snapshot. Its current preferred usage is a synonym .