New York Natural Heritage Program
Swamp Oats
Sphenopholis pensylvanica (L.) A.S. Hitchc.
Monocots
Family: Grass Family (Poaceae)

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?
The genus name comes from the Greek sphen, a wedge, and pholis, a scale, and refers to the shape of the second glume, a part of the flower (Fernald 1950).

State Ranking Justification [-]
There is one existing population which is very small and has not been seen since 1991. There are eight historical populations from the early 1900s which need to be resurveyed. There are four populations which no longer exist because their habitat has been destroyed.

Short-term Trends [-]

Long-term Trends [-]