Myriophyllum laxum Shuttlew. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Saxifragales family Haloragaceae genus Myriophyllum species Myriophyllum laxum Name Homonyms Myriophyllum laxum Shuttlew. ex Chapm. Myriophyllum laxum Shuttlew.