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Glyceria maxima (Hartm.) Holmb.

Species
ISFS : 191600
Checklist : 1021780

Synthesis

Species description (© Flora Helvetica 2018)

80-200 cm hoch, aufrecht, schilfartig, Stängel unten 0,5-1 cm dick. Blätter 10-20 mm breit, oberseits glatt, unterseits rau. Blatthäutchen 2-5 mm lang, abgerundet, oft mit aufgesetzter Spitze. Rispe 20-40 cm lang, ausgebreitet, dicht. Äste zu 5-10, schief aufrecht, starr. Ährchen sehr zahlreich, 5-12 mm lang, oval, etwas abgeflacht, 5-8blütig, gelbbraun. Untere Hüllspelze 2-2,5 mm lang, kürzer als die obere, beide +/- spitz. Deckspelzen 3-3,5 mm lang, 7nervig, unbegrannt.

Flowering period (© Flora Helvetica 2018)

7-8

Habitat and distribution inside Switzerland (© Flora Helvetica 2018)

Gräben, Ufer / kollin / M, vereinzelt JN und ANE

World distribution (© Flora Helvetica 2018)

Eurasiatisch

Ecological indicator (© Landolt & al. 2010)

5fw34+443.g.2n=60

Status

IUCN status

 Vulnerable

National Priority

 4 - weak national priority

International responsibility

 1 - weak

Anatomy

Summary of leaf anatomy (German)

Obere Epidermiszellen gleich gross wie untere. Epidermiszellen aussen verholzt. Punktuelle Versteifungselemente am Blattrand und bei der Blattrippe. Leitbündel freistehend. Leitbündelhülle nicht verholzt.

Summary of stem anatomy (German)

Umriss rund oder oval. Leitbündel in mehreren Reihen. Kleine Interzellularen, oft dreieckig. Epidermiszellen verholzt.

Description

Culm-diameter 2-5 mm, wall thin, radius of culm in relation to wall thickness approximately 1:0.25 or < 0.25. Outline circular with a smooth surface. Culm-center hollow and surrounded by many large thin-walled, not lignified cells. Epidermis-cells thick-walled all around. Large vascular bundles arranged in one peripheral row. Chlorenchyma absent. Sclerenchyma in a large, peripheral continuous belt (> 3 cells). Cells thick-walled. Small sclerenchymatic sheath with 1-2 cells around vascular bundles. Largest vessels in vascular bundles in lateral position. Largest vessel in the bundle 20-50 μm. Cavities (intercellulars) between parenchyma-cells present, small, often triangular. Distinct cavities (intercellulars) in the protoxylem area of vascular bundles.

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

Habitat and distribution inside Switzerland

M, vereinzelt JN und ANE

World distribution

Eurasiatisch

Ecology

Life form

Geophyte

Habitats

Habitats © Delarze & al. 2015

Character species 2.1.2.1 - Stillwasser-Röhricht (Phragmition)

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 5fw Light Value L 4 Salinity Index 1
Reaction Value R 3 Temperature factor T 4
Nutriments value N 4 Continentality K 3
  • 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

Accepted Name (Checklist 2017)

Glyceria maxima (Hartm.) Holmb.

Vernacular name

Deutscher Name :

Grosses Süssgras

Nom français :

Grande glycérie

Nome italiano :

Gramignone maggiore

Match with other reference books

Relation Nom Book No
=Glyceria maxima (Hartm.) Holmb.Checklist 2017191600
=Glyceria maxima (Hartm.) Holmb.Flora Helvetica 20012644
=Glyceria maxima (Hartm.) Holmb.Flora Helvetica 20122820
=Glyceria maxima (Hartm.) Holmb.Flora Helvetica 20182820
=Glyceria maxima (Hartm.) Holmb.Index synonymique 1996191600
=Glyceria maxima (Hartm.) Holmb.Landolt 1977301
=Glyceria maxima (Hartm.) Holmb.Landolt 1991264
=Glyceria maxima (Hartm.) Holmb.SISF/ISFS 2191600
=Glyceria maxima (Hartm.) Holmb.Welten & Sutter 19822244
= 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

-

IUCN list of endangered species (© Walter & Gillett 1997) :

No

Status on national Red List 2016

IUCN status:

 Vulnerable

LC: Non menacé

Additional information

IUCN criteria: A2c

Status on regional Red List 2019

Biogregraphic regions Status IUCN criteria
Jura (JU) ENA3c
Mittelland (MP) VUA2c
Alpennordflanke (NA) CRC2a(ii)
Westliche Zentralalpen (WA) --
Östliche Zentralalpen (EA) --
Alpensüdflanke (SA) --
  • Legend
    EXExtinct
    RERegionally Extinct
    CR(PE)Critically Endangered, Probably Extinct
    CRCritically Endangered
    ENEndangered
    VUVulnerable
    NTNear Threatened
    LCLeast Concern

National Priority Species List Status

National Priority 4 - weak national priority
Need to take action 2 -
International responsibility 1 - weak
Need to monitor populations 1 -

Protection status

International (Bern Convention) No
VDtotal protection (02.03.2005)
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.

Conservation

Threats and measures