A genus of about 40 species, mostly in the Western Hemisphere. As here circumscribed broadly, following PPG I (PPG 2016), Pellaea is not monophyletic and will likely be additionally split in the future (Kessler, Smith, & Prado 2017).
ID notes:Pellaea are small rock ferns with dark and lustrous petioles and rachises, and at least some of the pinnae grouped into 3s (except P. ovata, which has tannish petioles and rachises and pinnae all well-separated).
Ref: Gastony (1988); Gastony & Rollo (1998); Gastony, Yatskievych, & Dixon (1992); Heafner (2001); Kessler, Smith, & Prado (2017); Tryon, Tryon, & Kramer In Kramer & Green (1990); Windham (1993c) In Flora of North America Editorial Committee (1993b); Windham et al. (2022). Show full citations.