Sium suaveWalter

Water parsniphemlock water-parsniphemlock waterparsnip

WFO wfo-0000431479 Accepted WFO 2026-06 8 photographs CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Sium suave, photographed by Ryan Sorrells
fig. a Ryan Sorrells, CC BY 4.0 / 2021-10-28 / obs. 166364138
Sium suave, photographed by Mary Krieger
fig. b Mary Krieger, CC BY 4.0 / obs. 166033990
Sium suave, photographed by Kathy Richardson
fig. c Kathy Richardson, CC BY 4.0 / obs. 155353821
Sium suave, photographed by Mary Krieger
fig. d Mary Krieger, CC BY 4.0 / obs. 155036978
Sium suave, photographed by Mary Krieger
fig. e Mary Krieger, CC BY 4.0 / obs. 155045356
Sium suave, photographed by Mary Krieger
fig. f Mary Krieger, CC BY 4.0 / obs. 154650099
Sium suave, photographed by Nina Filippova
fig. g Nina Filippova, CC BY 4.0 / obs. 152676655
Sium suave, photographed by Henry "Nick" Robertson
fig. h Henry "Nick" Robertson, CC BY-SA 4.0 / obs. 151479611

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 82 botanical countries

Regions where Sium suave is native: Amur, Buryatiya, China North-Central, Chita, Inner Mongolia, Irkutsk, Japan, Kamchatka, Khabarovsk, Korea, Krasnoyarsk, Manchuria, Mongolia, Primorye, Sakhalin, Taiwan, Tuva, West Siberia, Yakutiya, Alabama, Alaska, Alberta, Arizona, Arkansas, British Columbia, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Labrador, Louisiana, Maine, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, Newfoundland, North Carolina, North Dakota, Northwest Territories, Nova Scotia, Nunavut, Ohio, Ontario, Oregon, Pennsylvania, Prince Edward I., Québec, Rhode I., Saskatchewan, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, Yukon AmurBuryatiyaChina North-CentralChitaInner MongoliaIrkutskJapanKamchatkaKhabarovskKrasnoyarskManchuriaMongoliaPrimoryeSakhalinTaiwanTuvaWest SiberiaYakutiyaAlabamaAlaskaAlbertaArizonaArkansasBritish ColumbiaCaliforniaColoradoConnecticutFloridaGeorgiaIdahoIllinoisIndianaIowaKansasKentuckyLabradorLouisianaMaineManitobaMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew BrunswickNew HampshireNew JerseyNew MexicoNew YorkNewfoundlandNorth CarolinaNorth DakotaNorthwest TerritoriesNova ScotiaNunavutOhioOntarioOregonPennsylvaniaPrince Edward I.QuébecSaskatchewanSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyomingYukon KoreaDelawareDistrict of ColumbiaRhode I.
Native distribution of Sium suave, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows. Regions too small to draw at this scale are marked with a dot.
RegionTDWG codeContinent
Alabama ALA NORTHERN AMERICA
Alaska ASK
Alberta ABT
Arizona ARI
Arkansas ARK
British Columbia BRC
California CAL
Colorado COL
Connecticut CNT
Delaware DEL
District of Columbia WDC
Florida FLA
Georgia GEO
Idaho IDA
Illinois ILL
Indiana INI
Iowa IOW
Kansas KAN
Kentucky KTY
Labrador LAB
Louisiana LOU
Maine MAI
Manitoba MAN
Maryland MRY
Massachusetts MAS
Michigan MIC
Minnesota MIN
Mississippi MSI
Missouri MSO
Montana MNT
Nebraska NEB
Nevada NEV
New Brunswick NBR
New Hampshire NWH
New Jersey NWJ
New Mexico NWM
New York NWY
Newfoundland NFL
North Carolina NCA
North Dakota NDA
Northwest Territories NWT
Nova Scotia NSC
Nunavut NUN
Ohio OHI
Ontario ONT
Oregon ORE
Pennsylvania PEN
Prince Edward I. PEI
Québec QUE
Rhode I. RHO
Saskatchewan SAS
South Carolina SCA
South Dakota SDA
Tennessee TEN
Texas TEX
Utah UTA
Vermont VER
Virginia VRG
Washington WAS
West Virginia WVA
Wisconsin WIS
Wyoming WYO
Yukon YUK
Amur AMU ASIA-TEMPERATE
Buryatiya BRY
China North-Central CHN
Chita CTA
Inner Mongolia CHI
Irkutsk IRK
Japan JAP
Kamchatka KAM
Khabarovsk KHA
Korea KOR
Krasnoyarsk KRA
Manchuria CHM
Mongolia MON
Primorye PRM
Sakhalin SAK
Taiwan TAI
Tuva TVA
West Siberia WSB
Yakutiya YAK

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Also published as 39 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Apium cicutifolia (J.F.Gmel.) Benth. & Hook.f. ex F.B.Forbes & Hemsl.
  • Apium cicutifolium (Schrenk) Benth. & Hook.f. ex F.B.Forbes & Hemsl.
  • Apium lineare (Michx.) Alph.Wood
  • Cicuta dahurica Fisch.
  • Cicuta davurica (Hoffm.) Fisch. ex F.Dietr.
  • Critamus dauricus Hoffm.
  • Drepanophyllum heterophyllum (Greene) Koso-Pol.
  • Drepanophyllum lineare (Michx.) Koso-Pol.
  • Falcaria dahurica DC.
  • Sium californicum Baill.
  • Sium cicutarium W.H.Baxter
  • Sium cicutifolium Schrank
  • Sium cicutifolium var. angustifolium Kom.
  • Sium cicutifolium var. brevifolium Peck
  • Sium cicutifolium var. carsonii Stevens
  • Sium cicutifolium var. heterophyllum (Greene) Jeps.
  • Sium cicutifolium var. latifolium Kom.
  • Sium cicutifolium var. lineare H.Wolff
  • Sium floridanum Small
  • Sium formosanum Hayata
  • Sium heterophyllum Greene
  • Sium lineare Michx.
  • Sium lineare var. intermedium Torr. & A.Gray
  • Sium nipponicum Maxim.

and 15 more.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.