Kalmar “ja zobo” yawanci tana nufin wani nau’in tsiro ne, musamman tsiron tsiro wanda ke cikin zuriyar Rumex. Ita wannan shuka tana da kyawawan ganyenta masu haske, masu launin ja, da ƙananan furanninta masu ja. Ana amfani da kalmar "zobo" don bayyana nau'ikan tsire-tsire masu ɗanɗano mai ɗanɗano ko ɗanɗano, kuma wannan shuka ta musamman an santa da ɗanɗanon acidic, wanda galibi ana amfani dashi a cikin dafa abinci.