Species description (Flora Helvetica 2018)

Stängel 10-70 cm lang, kahl, auf dem Schlamm kriechend oder im Wasser flutend, an den Knoten oft wurzelnd. Blätter gegenständig, breit-lanzettlich, ganzrandig, 1-3 cm lang, in den Stiel verschmälert, dieser bis zuunterst schmaler werdend. Blüten einzeln in den Blattwinkeln, sitzend, 4teilig, ohne Krone. Vorblätter kürzer als 1 mm. Kelch ca. 1,5 mm lang, hellgrün, Fruchtkapsel ca. 5 mm lang, mit 4 dunklen Nerven.

Flowering period (Flora Helvetica 2018)


Habitat and distribution inside Switzerland (Flora Helvetica 2018)

Gräben, Tümpelränder, zeitweise überschwemmte Orte / kollin / Südliches TI, GE, JU

World distribution (Flora Helvetica 2018)


Ecological indicator (Landolt & al. 2010)


Distribution map


Before threshold year
After threshold year
Before and after threshold year


Validated observations
Observations waiting for validation
Occurrences from Atlas Welten & Sutter (1982) and supplements (1984, 1994) without confirmation in the Info Flora database since
Before threshold year
After threshold year
Not native / introduced / subspontaneous / escaped

Number of observations

Below the threshold number of observations
Above or equal the threshold number of observations


Life form

Perennial hemicryptophyte, Therophyte


Habitats Delarze & al. 2015

Character species 2.5.1 - Einjährige Schlammflur (Zwergbinsenflur) (Nanocyperion)

bold Dominant species, influencing the appearance of the habitat
Character species Character species
Less strictly linked to a specific habitat Less strictly linked to a specific habitat

Ecological indicator values by Landolt & al. (2010)

Soil factors Climatic factors Salinity tolerance
Humidity Value H 5w+ Light Value L 4 Salinity Index --
Reaction Value R 2 Temperature factor T 4+
Nutriments value N 3 Continentality K 2
  • Ecological values legend
    Humidity Value H
    1very dry
    2moderatly dry
    3medium wet
    4very wet
    5submerged or underwater
    fplants living in running water
    umostly submerged plants
    vpartly submerged, partly floating plants
    whumidity moderately variable (± scale of 1-2)
    w+highly variable humidity (scale exceeding ± 2)
    Reaction Value R
    1Very acid (pH 2.5-5.5)
    2acid (pH 3.5-6.5)
    3lightly acid to neutral (pH 4.5-7.5)
    4neutral to basic (pH 5.5-8.5)
    5basic (pH 6-5 -> 8.5
    Nutriments value N
    1very low in nutrients
    2low in nutriments
    3medium-poor to medium-rich in nutrients
    4rich in nutriments
    5very rich in nutriments
    Salinity tolerance
    Light Value L
    1very shady
    3lighted areas
    5highly luminous
    Temperature factor T
    1alpine to nival stages (from the treeline to the snowline)
    1+suprasubalpine and upper subalpine levels (pine and larch forests)
    2subalpine level (coniferous forests without beeches up to the upper limit of spruces)
    2+lower subalpine and upper mountain stages
    3mountain level (beech and silver fir forests, in the central Alps Scots pine forests)
    3+lower mountain and upper hill levels
    4hill level (mixed deciduous oak forests)
    4+hot places, hill level
    5very hot places, hill level (only in the hottest places, typical of southern Europe)
    Continentality K
    1Atlantic (high air humidity, very low temperature variations, mild winters)
    2Sub-Atlantic (high air humidity, low temperature variations, relatively mild winters)
    3sub-Atlantic to subcontinental (average air humidity, moderately variable temperature, slightly low winter temperatures)
    4subcontinental (low air humidity, large temperature variations, rather cold winters)
    5continental (very low air humidity, very large temperature variations, cold winters)

Water dependency

Rivers 0 - No link
Calm water 2 - Essential habitat
Ground water 0 - No link


Vernacular name

Deutscher Name:
Nom français:
Ludwigie des marais
Nome italiano:
Porracchia dei fossi

Match with other reference books

Relation Nom Book No
=Ludwigia palustris (L.) ElliottChecklist 2017245300
=Ludwigia palustris (L.) ElliottFlora Helvetica 20011289
=Ludwigia palustris (L.) ElliottFlora Helvetica 20121036
=Ludwigia palustris (L.) ElliottFlora Helvetica 20181036
=Ludwigia palustris (L.) ElliottIndex synonymique 1996245300
=Ludwigia palustris (L.) ElliottLandolt 19772101
=Ludwigia palustris (L.) ElliottLandolt 19911715
=Ludwigia palustris (L.) ElliottSISF/ISFS 2245300
=Ludwigia palustris (L.) ElliottWelten & Sutter 19821092

= The taxon corresponds to the accepted taxon (Checklist 2017)
< The taxon is included in the accepted taxon (Checklist 2017)
> The taxon includes (among others) also the accepted taxon (Checklist 2017)

Checklist 2017 comments  

Auf Verwechslungen mit Ludwigia ×kentiana E. J. Clement ist zu achten.


Native status   -  -

Status on national Red List 2016

IUCN status:   Critically endangered

LC: Non menacé

Additional information

IUCN criteria: C1

Status on regional Red List 2019

Biogregraphic regions Status IUCN criteria
Jura (JU) CRC1
Mittelland (MP) CR(PE)
Alpennordflanke (NA) --
Westliche Zentralalpen (WA) --
Östliche Zentralalpen (EA) --
Alpensüdflanke (SA) CRC1
  • Legend
    RERegionally Extinct
    CR(PE)Critically Endangered, Probably Extinct
    CRCritically Endangered
    NTNear Threatened
    LCLeast Concern

IUCN list of endangered species (Walter & Gillett 1997)


National Priority Species List Status

National Priority 2 - high national priority
Need to take action 2 -
International responsibility 1 - weak
Need to monitor populations 2 -

Protection status

International (Bern Convention) No
GEtotal protection (25.07.2007)
VDtotal protection (02.03.2005)
Switzerland --
TItotal protection (23.01.2013)
  • Disclaimer
    InfoFlora compiles information on protected species as accurately as possible, taking it from the respective cantonal laws. In some cases, however, it was not possible to use the plant names as listed in the original text, but an interpretation of their taxonomy or nomenclature was necessary. The exact meaning of the categories „completely protected“ and „partially protected“ differs among the cantons.

    InfoFlora cannot guarantee that the information on the protection status is correct and complete. In case of doubts, we recommend to look up the texts of the respective cantonal law.

Threats and measures

Scomparsa dell'habitat

Stagni periodicamente svuotati (stagni per carpe), soprattutto nell'Ajoie, da convogliare(?) o restaurare. Rinaturalizzazione di vecchi stagni di carpe interrati e ombreggiati. Verificare se è possibile una possibile reintroduzione con materiale adatto.

Attività turistiche intensive (nuoto, campeggio, grigliata)

Creare delle zone protette (micro-riserve)

Popolazioni piccole e isolate

Moltiplicazione ex-situ in previsione di una reintroduzione; proseguire le misure di cura attuali; garantire il monitoraggio continuo dell'efficacia delle misure

Distruzione involontaria

Controlli regolari di ehemaligen Vorkommen e siti potenziali.

Ex situ material

In-situ measures