Elatine triandraSchkuhr

Mudwortthree-stamened waterwortthreestamen waterwort

WFO wfo-0000665387 Accepted WFO 2026-06 4 photographs CC BY

Plate 1 figs. a–d · 1 observation

This species has been photographed under an open licence only 1 time, 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.

Elatine triandra, photographed by Olivier Argagnon
fig. a Olivier Argagnon, CC BY 4.0 / 2021-09-23 / obs. 159439787
Elatine triandra, photographed by Olivier Argagnon
fig. b Olivier Argagnon, CC BY 4.0 / obs. 159439803
Elatine triandra, photographed by Olivier Argagnon
fig. c Olivier Argagnon, CC BY 4.0 / obs. 159439810
Elatine triandra, photographed by Olivier Argagnon
fig. d Olivier Argagnon, CC BY 4.0 / obs. 159439813

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 44 botanical countries

Regions where Elatine triandra is native: Altay, Amur, Buryatiya, China Southeast, Inner Mongolia, Japan, Khabarovsk, Korea, Manchuria, Nansei-shoto, Primorye, Tadzhikistan, Taiwan, West Siberia, Bangladesh, India, Jawa, Nepal, Philippines, Sumatera, Thailand, Vietnam, West Himalaya, Austria, Baltic States, Belarus, Belgium, Bulgaria, Central European Russia, Czechia-Slovakia, East European Russia, Finland, France, Germany, Hungary, Italy, Krym, North European Russia, Northwest European Russia, Norway, NW. Balkan Pen., Poland, Romania, Sweden AltayAmurBuryatiyaChina SoutheastInner MongoliaJapanKhabarovskManchuriaPrimoryeTadzhikistanTaiwanWest SiberiaBangladeshIndiaJawaNepalPhilippinesSumateraThailandVietnamWest HimalayaAustriaBaltic StatesBelarusBelgiumBulgariaCentral European RussiaCzechia-SlovakiaEast European RussiaFinlandFranceGermanyHungaryItalyKrymNorth European RussiaNorthwest European RussiaNorwayNW. Balkan Pen.PolandRomaniaSweden KoreaNansei-shoto
Native distribution of Elatine triandra, 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
Austria AUT EUROPE
Baltic States BLT
Belarus BLR
Belgium BGM
Bulgaria BUL
Central European Russia RUC
Czechia-Slovakia CZE
East European Russia RUE
Finland FIN
France FRA
Germany GER
Hungary HUN
Italy ITA
Krym KRY
North European Russia RUN
Northwest European Russia RUW
Norway NOR
NW. Balkan Pen. YUG
Poland POL
Romania ROM
Sweden SWE
Altay ALT ASIA-TEMPERATE
Amur AMU
Buryatiya BRY
China Southeast CHS
Inner Mongolia CHI
Japan JAP
Khabarovsk KHA
Korea KOR
Manchuria CHM
Nansei-shoto NNS
Primorye PRM
Tadzhikistan TZK
Taiwan TAI
West Siberia WSB
Bangladesh BAN ASIA-TROPICAL
India IND
Jawa JAW
Nepal NEP
Philippines PHI
Sumatera SUM
Thailand THA
Vietnam VIE
West Himalaya WHM

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.

Where it actually grows measured, from 68 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -14.3 °C -4.8 °C 10.1 °C
Warmest month, mean daily high 21.1 °C 23.4 °C 30.1 °C
Annual rainfall 579 mm 702 mm 2,827 mm
Rainfall in the driest quarter 63 mm 113 mm 384 mm

It is found where winters bring hard frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 68 research-grade observations of Elatine triandra that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.

Also published as 31 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.

  • Alsinastrum callitrichoides (Nyl.) Rupr.
  • Alsinastrum triandrum (Schkuhr) Rupr.
  • Birolia palludosa Bellardi
  • Crypta triandra A.Braun ex Walp.
  • Elatine callitrichoides (Nyl.) Kauffm.
  • Elatine gracilis H.Mason
  • Elatine hydropiper var. triandra (Schkuhr) Wahlenb.
  • Elatine hydropiper var. tripetala Hartm.
  • Elatine inaperta Lloyd
  • Elatine inaperta J.Lloyd ex Kuntze
  • Elatine microphylla Griseb.
  • Elatine nivalis Speg.
  • Elatine orientalis Makino
  • Elatine oryzetorum Kom.
  • Elatine senegalensis Perrott. ex A.Chev.
  • Elatine senegalensis Perr. ex A.Chev.
  • Elatine tetrandra Maxim.
  • Elatine triandra f. callitrichoides (Nyl.) Saelán, Kihlm. & Hjelt
  • Elatine triandra f. intermedia Seub.
  • Elatine triandra f. stenophylla Seub.
  • Elatine triandra f. submersa Seub.
  • Elatine triandra f. terrestris Seub.
  • Elatine triandra var. callitrichoides Nyl.
  • Elatine triandra var. genuina Fassett

and 7 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.