Hydrilla verticillata subsp. tenuis Casp. Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Alismatales family Hydrocharitaceae genus Hydrilla species Hydrilla verticillata Name Homonyms Hydrilla verticillata var. tenuis Casp. Hydrilla verticillata subsp. tenuis Casp.