Scouleria aquatica var. nigrescens (Kindb.) E.Britton Dataset Rank VARIETY 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