Alpine Waterleaf, Ballhead Waterleaf, Woolen Breeches: Hydrophyllum capitatum var. alpinum -
Fendler's Waterleaf, White-leaved Fendler's Waterleaf: Hydrophyllum fendleri var. albifrons (Synonyms: Hydrophyllum albifrons, Hydrophyllum congestum) -
Western Waterleaf: Hydrophyllum occidentale (Synonyms: Hydrophyllum occidentale var. occidentale, Hydrophyllum occidentale var. watsonii) -
Pacific Waterleaf, Slender-stemmed Waterleaf: Hydrophyllum tenuipes (Synonym: Hydrophyllum viridulum) -