Synthesis

Species description (Flora Helvetica 2018)

Ähnlich wie P. natans, aber untergetauchte Blätter zur Blütezeit noch vorhanden, lanzettlich, durchsichtig, meist lang gestielt, Schwimmblätter meist nur ca. 1,5mal so lang wie breit, ohne helles «Gelenk», Blatthäutchen stets kürzer als der Blattstiel (bei P. natans bis 10 cm lang, oft länger als der Blattstiel), Frucht nur 2-2,5 mm lang.

Flowering period (Flora Helvetica 2018)

6-8

Habitat and distribution inside Switzerland (Flora Helvetica 2018)

Langsam fliessende, nährstoffarme, kalkfreie Gewässer / kollin / Südliches TI

World distribution (Flora Helvetica 2018)

West- und südeuropäisch

Ecological indicator (Landolt & al. 2010)

5vw22-44+1.a.2n=26
.

Distribution map

Simple

Before threshold year
After threshold year
Before and after threshold year

Advanced

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

Number of observations

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

Ecology

Life form

Hydrophyte

Habitats

Habitats Delarze & al. 2015

Character species 2.1.3 - Strandlingsgesellschaften (Littorellion)

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 -- Light Value L -- Salinity Index --
Reaction Value R -- Temperature factor T --
Nutriments value N -- Continentality K --
  • Ecological values legend
    Humidity Value H
    1very dry
    1+dry
    2moderatly dry
    2+moist
    3medium wet
    3+wet
    4very wet
    4+soggy
    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
    1halotolerant
    3halophyle
    Light Value L
    1very shady
    2shady
    3lighted areas
    4luminous
    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

Nomenclature

Vernacular name

Deutscher Name:
Knöterichblättriges Laichkraut
Nom français:
Potamot à feuilles de renouée
Nome italiano:
Brasca poligonifoglia

Match with other reference books

Relation Nom Book No
=Potamogeton polygonifolius Pourr.Checklist 2017320000
=Potamogeton polygonifolius Pourr.Flora Helvetica 20012396
=Potamogeton polygonifolius Pourr.Flora Helvetica 20122388
=Potamogeton polygonifolius Pourr.Flora Helvetica 20182388
=Potamogeton polygonifolius Pourr.Index synonymique 1996320000
=Potamogeton polygonifolius Pourr.SISF/ISFS 2320000
=Potamogeton polygonifolius Pourr.Welten & Sutter 19822031

= 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)

Status

Native status   -  -

Status on national Red List 2016

IUCN status:   Endangered

LC: Non menacé

Additional information

IUCN criteria: B2ab(ii,iii,iv)

Status on regional Red List 2019

Biogregraphic regions Status IUCN criteria
Jura (JU) --
Mittelland (MP) --
Alpennordflanke (NA) --
Westliche Zentralalpen (WA) --
Östliche Zentralalpen (EA) --
Alpensüdflanke (SA) ENB2ab(ii,iii,iv)
  • Legend
    EXExtinct
    RERegionally Extinct
    CR(PE)Critically Endangered, Probably Extinct
    CRCritically Endangered
    ENEndangered
    VUVulnerable
    NTNear Threatened
    LCLeast Concern

IUCN list of endangered species (Walter & Gillett 1997)

No

National Priority Species List Status

National Priority 3 - medium national priority
Need to take action 2 -
International responsibility 1 - weak
Need to monitor populations 2 -

Protection status

International (Bern Convention) No
Cantonal--
Switzerland --
  • 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.

Anatomy

Images and descriptions (© Fritz H. Schweingruber & Hugo Berger)

text alt Stems, 100x
text alt Stems 400x

Summary of stem anatomy (German)

Umriss rund oder oval. Leitbündel diffus verteilt. Grosse runde oder ovale Intercellularen. Epidermiszellen nicht verholzt.

Description

Culm-diameter 2-5 mm, center full, radius of culm in relation to wall thickness 1:1. Outline circular with a smooth surface. Epidermis smooth. Epidermis thin-, peripheral thicker-walled (lignified). Chlorenchyma present, continuous peripheral belt with unlignified round cells (like a large cortex). One vascular bundle in the center. Small sclerenchymatic sheath around vascular bundles with 1-2 cells. Vessels in vascular bundles around the phloem not to recognize in normal light. Cavities (intercellulars) between parenchyma cells net-like (honeycomb). Cavities in the center of the central cylinder.