. . . "Magnoliophyta" . "Alismatales" . "Liliopsida" . . . "Hydrocharitaceae" . "Vallisneria" . . "Eelgrass" . "Vallisneria gigantea Graebn." . . . "Vallisneria gigantea" . . . . "Graebn." . "Plantae" . .