Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Click images to enlarge and show more photo credit.

Key to Pteridium

Dennstaedtiaceae

Pteridium

Copy permalink to share

(c) Campos, Aidan
1 Terminal segments of well-developed pinnules generally 10-15× as long as broad, about 1-2.5 mm wide; [FL peninsula only]
(c) Fleming, Gary P.
(c) jrcagle - CC-BY
1 Terminal segments of well-developed pinnules generally 2-15× as long as broad, about 2-8 mm wide; [widespread in our region].
(c) jrcagle - CC-BY
(c) Weakley, Alan - CC-BY-NC, permission granted to NCBG
  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
(c) Fleming, Gary P.
  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