New York Natural Heritage Program
Climbing Fern
Lygodium palmatum (Bernh.) Sw.
Ferns
Family: climbing fern family (Lygodiaceae)

State Protection: Endangered
listed species are those with: 1) 5 or fewer extant sites, or 2) fewer than 1,000 individuals, or 3) restricted to fewer than 4 U.S.G.S. 7 minute topographical maps, or 4) species listed as endangered by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S1
A State Rarity Rank of S1 means: This plant is endangered/critically imperiled in New York because of extreme rarity (typically 5 or fewer populations or very few remaining individuals) or is extremely vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G4
A Global Rarity Rank of G4 means: This species is apparently secure globally (typically with more than 100+ populations), though it may be quite rare in parts of its range, especially at the periphery.


Did you know?
This is our only fern that acts as a true vine, although it doesn't climb very high.

State Ranking Justification [-]
There are four existing populations but they are small and only one of them is on protected land. There are only five other historical locations for this fern in New York, from 1868 to 1965, but three of them no longer exist.

Short-term Trends [-]

Long-term Trends [-]