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Key to Lygodium

Lygodiaceae

Lygodium

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(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
1 Sterile pinnae palmately lobed into 4-8 entire-margined to undulate lobes; [native, mainly inland provinces but also Coastal Plain from SC northwards along the coast]
(c) Bradley, Keith
1 Sterile pinnae pinnately divided into numerous serrate pinnules; [non-native, mainly Coastal Plain, but also inland].
(c) Sorrie, Bruce A. - CC-BY
  2 Pinnules usually more than 1-pinnate, the primary divisions further divided or at least basally lobed
(c) Bradley, Keith
(c) Cressler, Alan M.
  2 Pinnules usually 1-pinnate, the primary divisions usually undivided and without basal lobes (other than the cordate to hastate base)