Callitriche hamulata W. D. J. Koch

Callitriche hamulata W. D. J. Koch

ISFS : 73100
Checklist : 1008110


Species description (© Flora Helvetica 2018)

Vollständig untergetaucht, ohne schwimmende Blattrosetten, meist nur mit bandförmigen, nach hinten allmählich verschmälerten Blättern (selten Landformen mit spatelförmigen Blättern). Narben zurückgebogen und auf der ganzen Länge der Frucht angedrückt (nur bei dieser C.-Art). Frucht rund, mit scharfen Kanten, aber nicht geflügelt, Durchmesser ca. 1 mm. Sonst wie C. palustris (Nr. 1638).

Flowering period (© Flora Helvetica 2018)


Habitat and distribution inside Switzerland (© Flora Helvetica 2018)

Fliessende oder stehende, nährstoffarme Gewässer / (montan-)alpin / A, vereinzelt J und M

World distribution (© Flora Helvetica 2018)


Ecological indicator (© Landolt & al. 2010)



IUCN status

 Near threatened

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

Habitat and distribution inside Switzerland

A, vereinzelt J und M

World distribution



Life form

Hydrophyte, Therophyte


Habitats © Delarze & al. 2015

Character species 1.2.1 - Brachsmen- und Barbenregion (Epipotamon) (Ranunculion fluitantis)
Character species 1.2.2 - Äschenregion (Hyporhithron) (Fontinalidion antipyreticae)

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 1
Reaction Value R 2 Temperature factor T 3
Nutriments value N 2 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)


Accepted Name (Checklist 2017)

Callitriche hamulata W. D. J. Koch

Vernacular name

Deutscher Name :

Hakiger Wasserstern

Nom français :

Etoile d'eau en crochet

Nome italiano :

Gamberaia arrotondata

Match with other reference books

Relation Nom Book No
=Callitriche hamulata W. D. J. KochChecklist 201773100
=Callitriche hamulata W. D. J. KochFlora Helvetica 20011618
=Callitriche hamulata W. D. J. KochFlora Helvetica 20121643
=Callitriche hamulata W. D. J. KochFlora Helvetica 20181643
=Callitriche hamulata W. D. J. KochIndex synonymique 199673100
=Callitriche hamulata W. D. J. KochLandolt 19771974
=Callitriche hamulata W. D. J. KochLandolt 19911617
=Callitriche hamulata W. D. J. KochSISF/ISFS 273100
=Callitriche hamulata W. D. J. KochWelten & Sutter 19821365
= 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)


Native status

IUCN list of endangered species (© Walter & Gillett 1997) : No

Status on national Red List 2016

IUCN status:

 Near threatened

Near threatened

Additional information

IUCN criteria: B2a

Status on regional Red List 2019

Biogregraphic regions Status IUCN criteria
Jura (JU) ENC2a(i)
Mittelland (MP) VUA2ac
Alpennordflanke (NA) NTB2a
Alpensüdflanke (SA) VUA2ac
Östliche Zentralalpen (EA) VUA2ac
Westliche Zentralalpen (WA) DD
  • Legend
    RERegionally Extinct
    CR(PE)Critically Endangered, Probably Extinct
    CRCritically Endangered
    NTNear Threatened
    LCLeast Concern
    DDData Deficient
    NENot Evaluated
    NANot Applicable

National Priority Species List Status

No national priority or international responsability

Protection status

International (Bern Convention) No
NWtotal protection (29.11.2005)
VDtotal protection (02.03.2005)
Switzerland --
GEtotal protection (25.07.2007)
  • 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.