Amphicarpaea bracteata shine sunan kimiyya don shuka wanda aka fi sani da gyada na Amurka ko gyada. Nasa ne na gidan Fabaceae kuma asalinsa ne a Arewacin Amurka. Itacen yana da tubers masu cin abinci kuma a wasu lokuta ana amfani dashi azaman tushen abinci ga namun daji. Sunan ta, Amphicarpaea, tana nufin gaskiyar cewa tana samar da furanni iri biyu - furannin iska waɗanda kwari ke lalata su da furannin ƙasa waɗanda suke da kansu. Bracteata yana nufin kasancewar ɓangarorin, ko ganyayen da aka gyara, akan shukar.