The Collaborative International Dictionary
Earthpea
Earthpea \Earth"pea`\, n. (Bot.) A species of pea ( Amphicarp[ae]a monoica). It is a climbing leguminous plant, with hairy underground pods.
Wiktionary
earthpea
n. A species of pea, (taxlink Amphicarpaea bracteata species noshow=1), that is a climbing leguminous plant with hairy underground pods.