Isoetes echinosporaDurieu

WFO wfo-0001107321 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Isoetes echinospora, photographed by Randal
fig. a Randal, CC0 1.0 / 2020-07-26 / obs. 86694700
Isoetes echinospora, photographed by Valerii Glazunov
fig. b Valerii Glazunov, CC BY 4.0 / obs. 74924873
Isoetes echinospora, photographed by Doug Suitor
fig. c Doug Suitor, CC BY 4.0 / obs. 141065620
Isoetes echinospora, photographed by Matt Bowser
fig. d Matt Bowser, CC BY 4.0 / obs. 25264835
Isoetes echinospora, photographed by Norma Malinowski
fig. e Norma Malinowski, CC BY 4.0 / obs. 22915044
Isoetes echinospora, photographed by Norma Malinowski
fig. f Norma Malinowski, CC BY 4.0 / obs. 21356868
Isoetes echinospora, photographed by Lara Gibson
fig. g Lara Gibson, CC BY 4.0 / obs. 9923475
Isoetes echinospora, photographed by Anastasia Titovets
fig. h Anastasia Titovets, CC BY 4.0 / obs. 176771465

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.

The specimen a real sheet, in a real collection

Herbarium
The New York Botanical Garden
Accession
02911829
Filed as
Isoetes echinospora Durieu
Det. by
A. Smith 2010-01-01
Collected
B. Ertter 2004-09-07
Origin
US
The sheet
View the digitised specimen (CC BY 4.0)

A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.

Native range 62 botanical countries

Regions where Isoetes echinospora is native: Buryatiya, Chita, Irkutsk, West Siberia, Yakutiya, Austria, Baltic States, Central European Russia, Czechia-Slovakia, Denmark, East European Russia, Finland, France, Germany, Great Britain, Iceland, Ireland, Italy, Netherlands, North European Russia, Norway, Poland, Spain, Sweden, Switzerland, Alaska, Alberta, British Columbia, California, Colorado, Connecticut, Delaware, Greenland, Idaho, Labrador, Maine, Manitoba, Massachusetts, Michigan, Minnesota, Montana, New Brunswick, New Hampshire, New Jersey, New York, Newfoundland, Northwest Territories, Nova Scotia, Nunavut, Ohio, Ontario, Oregon, Pennsylvania, Québec, Rhode I., Saskatchewan, Utah, Vermont, Washington, Wisconsin, Wyoming, Yukon BuryatiyaChitaIrkutskWest SiberiaYakutiyaAustriaBaltic StatesCentral European RussiaCzechia-SlovakiaDenmarkEast European RussiaFinlandFranceGermanyIcelandIrelandItalyNetherlandsNorth European RussiaNorwayPolandSpainSwedenSwitzerlandAlaskaAlbertaBritish ColumbiaCaliforniaColoradoConnecticutGreenlandIdahoLabradorMaineManitobaMassachusettsMichiganMinnesotaMontanaNew BrunswickNew HampshireNew JerseyNew YorkNewfoundlandNorthwest TerritoriesNova ScotiaNunavutOhioOntarioOregonPennsylvaniaQuébecSaskatchewanUtahVermontWashingtonWisconsinWyomingYukon DelawareRhode I.
Native distribution of Isoetes echinospora, 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
British Columbia BRC
California CAL
Colorado COL
Connecticut CNT
Delaware DEL
Greenland GNL
Idaho IDA
Labrador LAB
Maine MAI
Manitoba MAN
Massachusetts MAS
Michigan MIC
Minnesota MIN
Montana MNT
New Brunswick NBR
New Hampshire NWH
New Jersey NWJ
New York NWY
Newfoundland NFL
Northwest Territories NWT
Nova Scotia NSC
Nunavut NUN
Ohio OHI
Ontario ONT
Oregon ORE
Pennsylvania PEN
Québec QUE
Rhode I. RHO
Saskatchewan SAS
Utah UTA
Vermont VER
Washington WAS
Wisconsin WIS
Wyoming WYO
Yukon YUK
Austria AUT EUROPE
Baltic States BLT
Central European Russia RUC
Czechia-Slovakia CZE
Denmark DEN
East European Russia RUE
Finland FIN
France FRA
Germany GER
Great Britain GRB
Iceland ICE
Ireland IRE
Italy ITA
Netherlands NET
North European Russia RUN
Norway NOR
Poland POL
Spain SPA
Sweden SWE
Switzerland SWI
Buryatiya BRY ASIA-TEMPERATE
Chita CTA
Irkutsk IRK
West Siberia WSB
Yakutiya YAK

Not drawn on the map: Great Britain. We hold no public-domain boundary for this region, so it is 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.

Where it actually grows measured, from 109 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -23.6 °C -13.0 °C -0.2 °C
Warmest month, mean daily high 14.2 °C 22.4 °C 26.1 °C
Annual rainfall 630 mm 910 mm 2,271 mm
Rainfall in the driest quarter 71 mm 152 mm 295 mm

It is found where winters are severely cold. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 109 research-grade observations of Isoetes echinospora 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 65 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.

  • Calamaria echinospora (Durieu) Kuntze
  • Isoetes ambigua A.Braun
  • Isoetes boottii A.Braun
  • Isoetes braunii Durieu
  • Isoetes braunii f. astoma (Iversen) M.Broun
  • Isoetes braunii f. oligostoma (Iversen) M.Broun
  • Isoetes braunii f. polystoma (Iversen) M.Broun
  • Isoetes echinospora f. astoma Iversen
  • Isoetes echinospora f. boottii (Engelm.) Clute
  • Isoetes echinospora f. oligostoma Iversen
  • Isoetes echinospora f. polystoma Iversen
  • Isoetes echinospora subf. angusstivelata Iversen
  • Isoetes echinospora subf. angustivelata Iversen
  • Isoetes echinospora subf. lativelata Iversen
  • Isoetes echinospora subsp. admixta Gand.
  • Isoetes echinospora subsp. belgica Gand.
  • Isoetes echinospora subsp. borealis Gand.
  • Isoetes echinospora subsp. centralis Gand.
  • Isoetes echinospora subsp. discedens Gand.
  • Isoetes echinospora subsp. fennica Gand.
  • Isoetes echinospora subsp. gothica Gand.
  • Isoetes echinospora subsp. montana Gand.
  • Isoetes echinospora subsp. muricata (Durieu) Á.Löve & D.Löve
  • Isoetes echinospora subsp. oligophylla Gand.

and 41 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. 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.