"Plantae" . . . "Waterthyme" . . "Hydrocharitaceae" . "Hydrilla verticillata" . . . . . . . "(L. f.) Royle" . . . "Magnoliophyta" . . "Hydrilla" . "Hydrilla verticillata (L. f.) Royle" . "Liliopsida" . . . . . . "Alismatales" . .