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Key to Amphicarpum

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Show caption*© Douglas Goldman, some rights reserved (CC BY-SA), uploaded by Douglas Goldman 1 Leaf blades hirsute with pustular-based hairs on both surfaces, the margins ciliate (and also slightly cartilaginous-thickened); [of moist to wet, peaty or sandy-peaty soils]  Amphicarpum amphicarpon

Show caption*© Scott Ward 1 Leaf blades glabrous, the margins cartilaginous-thickened; [of seasonally flooded natural ponds]  Amphicarpum muehlenbergianum