Callitriche hermaphroditicaL.

Autumnal Water-starwortautumnal water-starwortnorthern water-starwort

WFO wfo-0000777394 Accepted WFO 2026-06 8 photographs CC BY

Plate 1 figs. a–h · 5 observations

This species has been photographed under an open licence only 5 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.

Callitriche hermaphroditica, photographed by Michael D. Pirie
fig. a Michael D. Pirie, CC BY 4.0 / 2021-09-06 / obs. 155605492
Callitriche hermaphroditica, photographed by Valerii Glazunov
fig. b Valerii Glazunov, CC BY 4.0 / obs. 176660492
Callitriche hermaphroditica, photographed by Matt Bowser
fig. c Matt Bowser, CC BY 4.0 / obs. 22857940
Callitriche hermaphroditica, photographed by Юлия
fig. d Юлия, CC BY 4.0 / obs. 102741071
Callitriche hermaphroditica, photographed by Юлия
fig. e Юлия, CC BY 4.0 / obs. 102741082
Callitriche hermaphroditica, photographed by Юлия
fig. f Юлия, CC BY 4.0 / obs. 100649964
Callitriche hermaphroditica, photographed by Юлия
fig. g Юлия, CC BY 4.0 / obs. 100649961
Callitriche hermaphroditica, photographed by Michael D. Pirie
fig. h Michael D. Pirie, CC BY 4.0 / obs. 155605515

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 67 botanical countries

Regions where Callitriche hermaphroditica is native: Altay, Buryatiya, Chita, Inner Mongolia, Irkutsk, Japan, Kamchatka, Kazakhstan, Khabarovsk, Kirgizstan, Krasnoyarsk, Kuril Is., Magadan, Mongolia, Primorye, Sakhalin, Tadzhikistan, Tibet, Tuva, West Siberia, Xinjiang, Yakutiya, East Himalaya, West Himalaya, Baltic States, Belarus, Central European Russia, Czechia-Slovakia, Denmark, East European Russia, Finland, Føroyar, Germany, Great Britain, Iceland, Ireland, Netherlands, North European Russia, Northwest European Russia, Norway, Poland, Romania, Sweden, Ukraine, Alaska, Alberta, Aleutian Is., British Columbia, Colorado, Greenland, Idaho, Illinois, Minnesota, Montana, Nebraska, New Jersey, New York, Newfoundland, Northwest Territories, Ontario, Oregon, Québec, Saskatchewan, Utah, Vermont, Wisconsin, Wyoming AltayBuryatiyaChitaInner MongoliaIrkutskJapanKamchatkaKazakhstanKhabarovskKirgizstanKrasnoyarskMagadanMongoliaPrimoryeSakhalinTadzhikistanTibetTuvaWest SiberiaXinjiangYakutiyaEast HimalayaWest HimalayaBaltic StatesBelarusCentral European RussiaCzechia-SlovakiaDenmarkEast European RussiaFinlandGermanyIcelandIrelandNetherlandsNorth European RussiaNorthwest European RussiaNorwayPolandRomaniaSwedenUkraineAlaskaAlbertaBritish ColumbiaColoradoGreenlandIdahoIllinoisMinnesotaMontanaNebraskaNew JerseyNew YorkNewfoundlandNorthwest TerritoriesOntarioOregonQuébecSaskatchewanUtahVermontWisconsinWyoming Føroyar
Native distribution of Callitriche hermaphroditica, 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
Alaska ASK NORTHERN AMERICA
Alberta ABT
Aleutian Is. ALU
British Columbia BRC
Colorado COL
Greenland GNL
Idaho IDA
Illinois ILL
Minnesota MIN
Montana MNT
Nebraska NEB
New Jersey NWJ
New York NWY
Newfoundland NFL
Northwest Territories NWT
Ontario ONT
Oregon ORE
Québec QUE
Saskatchewan SAS
Utah UTA
Vermont VER
Wisconsin WIS
Wyoming WYO
Altay ALT ASIA-TEMPERATE
Buryatiya BRY
Chita CTA
Inner Mongolia CHI
Irkutsk IRK
Japan JAP
Kamchatka KAM
Kazakhstan KAZ
Khabarovsk KHA
Kirgizstan KGZ
Krasnoyarsk KRA
Kuril Is. KUR
Magadan MAG
Mongolia MON
Primorye PRM
Sakhalin SAK
Tadzhikistan TZK
Tibet CHT
Tuva TVA
West Siberia WSB
Xinjiang CHX
Yakutiya YAK
Baltic States BLT EUROPE
Belarus BLR
Central European Russia RUC
Czechia-Slovakia CZE
Denmark DEN
East European Russia RUE
Finland FIN
Føroyar FOR
Germany GER
Great Britain GRB
Iceland ICE
Ireland IRE
Netherlands NET
North European Russia RUN
Northwest European Russia RUW
Norway NOR
Poland POL
Romania ROM
Sweden SWE
Ukraine UKR
East Himalaya EHM ASIA-TROPICAL
West Himalaya WHM

Not drawn on the map: Kuril Is., Great Britain, 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 19 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 angustifolia Gilib.
  • Callitriche aquatica var. autumnalis Bonnier
  • Callitriche autumnalis L.
  • Callitriche autumnalis f. linnei Kütz.
  • Callitriche autumnalis f. macrocarpa Hegelm.
  • Callitriche autumnalis var. linearis (Pursh) A.Gray
  • Callitriche confervoides Thuill. ex Link
  • Callitriche decussata Link
  • Callitriche euautumnalis Syme
  • Callitriche exalata (Tzvelev) Tzvelev
  • Callitriche foliosa Raf.
  • Callitriche glomerata Thuill. ex Link
  • Callitriche linearis Pursh
  • Callitriche sessilis DC.
  • Callitriche sessilis var. autumnalis Mérat
  • Callitriche sessilis var. confervoides Mérat
  • Callitriche stellaria Raf.
  • Callitriche virens Goldb.
  • Stellaria autumnalis Houtt.

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.