| Sium aberdarensum (C.Norman) M.Hiroe | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium ammi Vest | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium amomum Roth | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium angustifolium L. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium annuum Roth | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium apium Roth | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium aquaticum Gueldenst. ex Ledeb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium aromaticum Lam. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium asperum Thunb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium augustifolium L. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium berula Gouan | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium berula J.F.Gmel. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium bracteatum (Roxb.) Cronk | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium brevifolium DC. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium bulbocastanum Spreng. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium bulbosum Thore | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium bulbosum Poir. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium burchellii Hemsl. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium californicum Baill. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium canadense Lam. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium carsonii Durand | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium carum F.H.Wigg. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium carvi Bernh. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium cicuta F.H.Wigg. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium cicutarium W.H.Baxter | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium cicutifolium Schrenk | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium cicutifolium var. carsonii (Durand) Eames | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium cicutifolium var. heterophyllum (Greene) Jeps. | 
		Unresolved | 
		  | 
		TRO | 
	
	
		| Sium cicutifolium var. lineare H.Wolff | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium conium Vest | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium cordiennii Loisel. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium coriaudrum Vest | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium crassipes Spreng. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium crinitum Poir. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium crispum Noronha | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium cyminosma Basiner | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium cynapium Vest | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium decumbens Thunb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium denticulatum Baldwin ex Elliott | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium difformum (L.) M.Hiroe | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium diversifolium H.Wolff | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium douglasii DC. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium erectum Huds. | 
		Synonym | 
		  | 
		WCSP (in review) | 
	
	
		| Sium falcaria L. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium falcatum Dubois | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium ferula Raeusch. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium ferulifolium Spreng. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium filifolium Steud. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium filifolium Thunb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium floridanum Small | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium formosanum Hayata | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium frigidum Hand.-Mazz. | 
		Accepted | 
		  | 
		TRO | 
	
	
		| Sium gallabatense Schweinf. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium glaucum Vest | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium graecum Guss. ex Spreng. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium graecum Lour. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium graecum L. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium grandiflorum Thunb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium graveolens Vest | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium helenianum Hook.f. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium heterophyllum Greene | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium hippomarathrum Roth | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium hispidum Thunb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium incisum Torr. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium intermedium DC. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium intermedium Ten. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium inundatum Lam. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium japonicum Thunb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium javanicum Blume | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium laciniatum Blume | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium lancifolium M.Bieb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium lancifolium Schrank | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium latifolium L. | 
		Accepted | 
		  | 
		TRO | 
	
	
		| Sium latijugum C.B.Clarke | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium latissimum Boreau | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium limosum Moris ex DC. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium lineare Michx. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium lobatum Moon | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium longifolium Pursh | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium luteum Spreng. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium marginatum Poir. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium matsumurae H. Boissieu | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium medium Fisch. & C.A. Mey. | 
		Accepted | 
		  | 
		TRO | 
	
	
		| Sium napiforme Schult. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium neurophyllum (Maxim.) H. Hara | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium ninsi Thunb. | 
		Accepted | 
		  | 
		TRO | 
	
	
		| Sium nipponicum Maxim. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium nodiflorum L. | 
		Synonym | 
		  | 
		WCSP (in review) | 
	
	
		| Sium nodiflorum Walter | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium novae-mexicae Koso-Pol. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium novi-mexici Koso-Pol. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium nudicaule Lam. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium oppositifolium Kit. ex Schult. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium orientale Soó | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium ovatum Yatabe | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium paniculatum Thunb. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium patulum Thunb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium petroselinum Vest | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium peucedanoides Spreng. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium podagraria F.H.Wigg. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium podolicum Colla | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium podolicum G.Don | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium podolicum Besser ex Rchb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium pusillum Nutt. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium radiatum Viv. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium repandum Welw. ex Hiern | 
		Accepted | 
		  | 
		WCSP (in review) | 
	
	
		| Sium repens Jacq. | 
		Synonym | 
		  | 
		WCSP (in review) | 
	
	
		| Sium rigidius L. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium rugosum Raf. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium saxifragum Roth | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium segetum Lam. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium serrum (Franch. & Sav.) Kitag. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium siculum L. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium silaus Roth | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium simense J.Gay ex A.Rich. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium sisaroideum DC. | 
		Accepted | 
		  | 
		TRO | 
	
	
		| Sium sisarum L. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium stoloniferum Guss. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium suave Walter | 
		Accepted | 
		  | 
		WCSP (in review) | 
	
	
		| Sium suave f. carsonii (Durand) Fassett | 
		Accepted | 
		  | 
		TRO | 
	
	
		| Sium suave var. floridanum (Small) C.F. Reed | 
		Accepted | 
		  | 
		TRO | 
	
	
		| Sium sulcatum Pers. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium tenue Kom. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium tenuifolium Muhl. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium teretifolium Elliott | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium testiculatum Vest | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium thunbergii DC. | 
		Synonym | 
		  | 
		TRO | 
	
	
		| Sium tortuosum Roth | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium tricuspidatum Elliott | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium trifoliatum Poir. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium triternatum Moon | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium triternatum Miq. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium turfosum H.Wolff | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium verrucosum J.Gay ex A.Rich. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium verticillatum Petters ex Rchb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium verticillatum Lam. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium villosum Thunb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium virens Steud. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium virescens Spreng. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium visnaga Stokes | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium vulgare Gueldenst. ex Ledeb. | 
		Unresolved | 
		  | 
		WCSP (in review) | 
	
	
		| Sium vulgare Bernh. | 
		Unresolved | 
		  | 
		WCSP (in review) |