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Key to Pteridium

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Show caption*© Aidan Campos 1 Terminal segments of well-developed pinnules generally 10-15× as long as broad, about 1-2.5 mm wide; [FL peninsula only]  Pteridium caudatum

1 Terminal segments of well-developed pinnules generally 2-15× as long as broad, about 2-8 mm wide; [widespread in our region].

2 Leaf segment margins slightly to moderately pubescent (with 1-12 hairs per mm); terminal (caudate) tip of the basalmost pinnule of the basal pinna (3-) avg. 12 (-28)% as long as the entire pinnule; terminal segments of well-developed pinnules generally 2-4× as long as broad, about 3-8 mm wide  Pteridium latiusculum

Show caption*© Gary P. Fleming   2 Leaf segment margins glabrous (rarely sparsely pilose with as many as 4 hairs per mm); terminal (caudate) tip of the basalmost pinnule of the basal pinna (16-) avg. 25 (-45)% as long as the entire pinnule; terminal segments of well-developed pinnules generally 6-15× as long as broad, about 2-5 mm wide  Pteridium pseudocaudatum