New York Natural Heritage Program
Peanut Grass
Amphicarpum purshii Kunth
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: 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?
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 [-]