Ko e ʻakau tenga-efuefu ko e ʻakau ia ʻoku ne fakafanau ngāueʻaki he tengaefuefu. Ko e vahe ia ʻi he fakafaʻafaʻahinga fakasaienisi, tatau mo hono tokoua, ko e fanga ʻakau tengaʻiʻakau. Ko e tracheophytes kinaua, ʻa ia ʻoku ʻi ai haʻane ngaahi kālava ʻi loto maʻa e fetuku ʻo e vai pe toʻi.