| Hydrophyllum acerifolium Salisb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum albifrons A. Heller | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum albifrons var. fendleri (A. Gray) Brand | 
		Unresolved | 
		  | 
		TRO | 
	
	
		| Hydrophyllum aldea Roem. & Schult. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum alpestre A.Nelson & P.B.Kenn. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum appendiculatum Michx. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum atranthum Alexander | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum brownei Kral & V.M.Bates | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum canadense L. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum capitatum Douglas ex Benth. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum capitatum var. thompsonii (M. Peck) Constance | 
		Unresolved | 
		  | 
		TRO | 
	
	
		| Hydrophyllum cochinchinense Lour. ex Steud. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum congestum Wiegand | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum erectum Sessé & Moç. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum fendleri (A. Gray) A. Heller | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum fendleri var. albifrons (A. Heller) J.F. Macbr. | 
		Unresolved | 
		  | 
		TRO | 
	
	
		| Hydrophyllum hispidum Riddell | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum lineare Pursh | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum lobatum Stokes | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum macrophyllum Nutt. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum macrophyllum var. occidentale S. Watson | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum magellanicum Lam. | 
		Synonym | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum magellanicum var. pinnatum Macloskie | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum occidentale (S. Watson) A. Gray | 
		Accepted | 
		  | 
		TRO | 
	
	
		| Hydrophyllum occidentale var. fendleri A. Gray | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum occidentale var. watsonii A.Gray | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum paniculatum Poepp. ex A.DC. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum patens Britton | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum pinnatifidum Moench | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum pusillum Muhl. ex A.DC. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum spiraeifolium Salisb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum tenuipes A.Heller | 
		Accepted | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum thompsonii M. Peck | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Hydrophyllum trilobum Raf. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum virginianum L. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum virginianum var. patens (Britton) Brand | 
		Unresolved | 
		  | 
		TRO | 
	
	
		| Hydrophyllum virginicum L. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum viridulum G.N.Jones | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Hydrophyllum watsonii (A.Gray) Rydb. | 
		Unresolved | 
		  | 
		WCSP (in review) |