Scouleria aquatica f. nigrescens Kindb. Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Bryophyta class Bryopsida order Scouleriales family Scouleriaceae genus Scouleria species Scouleria aquatica Name Homonyms Scouleria aquatica f. nigrescens Kindb. Scouleria aquatica var. nigrescens (Kindb.) E.Britton