Ballhead Waterleaf, Wool Breeches, Woolen Breeches: Hydrophyllum capitatum var. capitatum -
Ballhead Waterleaf, Wool Breeches, Woolen Breeches: Hydrophyllum capitatum var. thompsonii -
Fendler's Waterleaf, White-leaved Fendler's Waterleaf: Hydrophyllum fendleri var. albifrons (Synonym: Hydrophyllum congestum) -
Pacific Waterleaf: Hydrophyllum tenuipes (Synonym: Hydrophyllum viridulum) -