New York Natural Heritage Program
Peanut Grass
Amphicarpum amphicarpon (Pursh) Nash
Amphicarpum purshii illustration USDA Plants USDA Plants website
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: SH
A State Rarity Rank of SH means: This plant is only historically known from New York State, typically with the last plant observed over 20 years ago. Many SH plants have not been seen in 50-100 years.

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?
Amphicarpic plants produce both aerial fruits and subterranean fruits. Like peanuts, this grass produces subterranean fruits early in the season and a few aerial fruits, which are also fertile, later in the summer (Flora of North America Editorial Committee 2003). The species is named for the botanist Frederick Pursh who discovered the plant (Fernald 1950).

State Ranking Justification [-]
There was one population that was newly documented in 1992 but it may not have survived. Additional surveys, especially during low water years, are needed to determine if the population has survived.

Short-term Trends [-]

Long-term Trends [-]