| | clover fern, pepperwort; pillwort, Pilularia globulifera; regnellidium, Regnellidium diphyllum; floating-moss, Salvinia rotundifolia, Salvinia auriculata; mosquito fern, floating fern, Carolina pond fern, Azolla caroliniana; floating fern, water sprite, Ceratopteris pteridioides; floating fern, Ceratopteris thalictroides |