Amphicarpum amphicarpon, commonly known as peanut grass or Pursh's blue maidencane, is an annual wetland species found in the eastern United States.

Its common name honours botanist Frederick Traugott Pursh.

[2] It was previously found within New York state but is now considered possibly extirpated.

[3] A single population was discovered on Nantucket in 1988, 240 miles north of its previously known northernmost site.

[5] The plant produces subterranean fruits early in the growing season, which are self-fertilizing (chasmogamous).