Callitriche heterophyllaPursh

Two-headed water-starworttwoheaded water-starwort

WFO wfo-0000777434 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Callitriche heterophylla, photographed by Northcut
fig. a Northcut, CC BY 4.0 / 2022-03-19 / obs. 183757127
Callitriche heterophylla, photographed by Josh
fig. b Josh, CC BY 4.0 / obs. 132006238
Callitriche heterophylla, photographed by Michelle W. （鍾偉瑋）
fig. c Michelle W. （鍾偉瑋）, CC BY 4.0 / obs. 118378507
Callitriche heterophylla, photographed by kcthetc1
fig. d kcthetc1, CC0 1.0 / obs. 113809764
Callitriche heterophylla, photographed by Robert Webster
fig. e Robert Webster, CC BY-SA 4.0 / obs. 67718024
Callitriche heterophylla, photographed by Don Loarie
fig. f Don Loarie, CC BY 4.0 / obs. 13555757
Callitriche heterophylla, photographed by Will Bennett
fig. g Will Bennett, CC BY 4.0 / obs. 63859152
Callitriche heterophylla, photographed by Robert Webster
fig. h Robert Webster, CC BY-SA 4.0 / obs. 69529167

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 77 botanical countries

Regions where Callitriche heterophylla is native: Kamchatka, Kuril Is., Alabama, Alaska, Alberta, Aleutian Is., Arizona, Arkansas, British Columbia, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Greenland, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Labrador, Louisiana, Maine, Manitoba, Maryland, Massachusetts, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Minnesota, Mississippi, Missouri, Montana, Nevada, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, Newfoundland, North Carolina, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Québec, Rhode I., South Carolina, Tennessee, Texas, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, Yukon, Argentina Northeast, Argentina Northwest, Argentina South, Bolivia, Chile Central, Chile South, Costa Rica, Dominican Republic, Ecuador, Guatemala, Uruguay, Venezuela KamchatkaAlabamaAlaskaAlbertaArizonaArkansasBritish ColumbiaCaliforniaColoradoConnecticutFloridaGeorgiaGreenlandIdahoIllinoisIndianaIowaKansasKentuckyLabradorLouisianaMaineManitobaMarylandMassachusettsMexico CentralMexico GulfMexico NortheastMexico NorthwestMexico SoutheastMexico SouthwestMinnesotaMississippiMissouriMontanaNevadaNew BrunswickNew HampshireNew JerseyNew MexicoNew YorkNewfoundlandNorth CarolinaNova ScotiaOhioOklahomaOntarioOregonPennsylvaniaQuébecSouth CarolinaTennesseeTexasVermontVirginiaWashingtonWest VirginiaWisconsinWyomingYukonArgentina NortheastArgentina NorthwestArgentina SouthBoliviaChile CentralChile SouthCosta RicaDominican RepublicEcuadorGuatemalaUruguayVenezuela DelawareDistrict of ColumbiaRhode I.
Native distribution of Callitriche heterophylla, 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
Aleutian Is. ALU
Arizona ARI
Arkansas ARK
British Columbia BRC
California CAL
Colorado COL
Connecticut CNT
Delaware DEL
District of Columbia WDC
Florida FLA
Georgia GEO
Greenland GNL
Idaho IDA
Illinois ILL
Indiana INI
Iowa IOW
Kansas KAN
Kentucky KTY
Labrador LAB
Louisiana LOU
Maine MAI
Manitoba MAN
Maryland MRY
Massachusetts MAS
Mexico Central MXC
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Northwest MXN
Mexico Southeast MXT
Mexico Southwest MXS
Minnesota MIN
Mississippi MSI
Missouri MSO
Montana MNT
Nevada NEV
New Brunswick NBR
New Hampshire NWH
New Jersey NWJ
New Mexico NWM
New York NWY
Newfoundland NFL
North Carolina NCA
Nova Scotia NSC
Ohio OHI
Oklahoma OKL
Ontario ONT
Oregon ORE
Pennsylvania PEN
Québec QUE
Rhode I. RHO
South Carolina SCA
Tennessee TEN
Texas TEX
Vermont VER
Virginia VRG
Washington WAS
West Virginia WVA
Wisconsin WIS
Wyoming WYO
Yukon YUK
Argentina Northeast AGE SOUTHERN AMERICA
Argentina Northwest AGW
Argentina South AGS
Bolivia BOL
Chile Central CLC
Chile South CLS
Costa Rica COS
Dominican Republic DOM
Ecuador ECU
Guatemala GUA
Uruguay URU
Venezuela VEN
Kamchatka KAM ASIA-TEMPERATE
Kuril Is. KUR

Not drawn on the map: Kuril Is., Aleutian Is.. We hold no public-domain boundary for these regions, so they are listed rather than guessed at.

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 11 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.

  • Callitriche anceps Fernald
  • Callitriche asagraei Hegelm.
  • Callitriche bolanderi Hegelm.
  • Callitriche brevifolia Pursh
  • Callitriche cruciata Raf.
  • Callitriche heterophylla subsp. bolanderi (Hegelm.) Calder & Roy L.Taylor
  • Callitriche heterophylla var. bolanderi (Hegelm.) Fassett
  • Callitriche heterophylla var. heterophylla
  • Callitriche ovata Raf.
  • Callitriche palustris var. bolanderi (Hegelm.) Jeps.
  • Callitriche tuerckheimii Urb.

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.