Synthesis

Species description (Flora Helvetica 2018)

Blütentragende Stängel 15-50 cm hoch, ca. 1 mm dick, dicht stehend, oft etwas gebogen, rund oder abgeflacht, am Grund mit 1-2 Blättern. Grundständige Blätter ca. 1 mm breit, flach, gerade aufrecht. Blütenstand endständig, vielblütig, von 2-3 Hochblättern überragt. Perigonblätter 3-4 mm lang, gelbgrün, fein zugespitzt, 3nervig, länger als die gelbbraune Frucht.

Flowering period (Flora Helvetica 2018)

6-9

Habitat and distribution inside Switzerland (Flora Helvetica 2018)

Feuchte Wege, Rasen, Ödland / kollin-montan / CH

World distribution (Flora Helvetica 2018)

Ursprünglich nordamerikanisch

Ecological indicator (Landolt & al. 2010)

3+w+24-43+3.h.2n=30,32,40,84
.

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

Perennial hemicryptophyte

Habitats

Habitats Delarze & al. 2015

Less strictly linked to a specific habitat 7.1.1 - Feuchte Trittflur (Agropyro-Rumicion)

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 3+w+ Light Value L 4 Salinity Index --
Reaction Value R 2 Temperature factor T 3+
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)

Nomenclature

Vernacular name

Deutscher Name:
Zarte Binse
Nom français:
Jonc grêle
Nome italiano:
Giunco americano

Match with other reference books

Relation Nom Book No
=Juncus tenuis Willd.Checklist 2017220000
=Juncus tenuis Willd.Flora Helvetica 20012439
=Juncus tenuis Willd.Flora Helvetica 20122611
=Juncus tenuis Willd.Flora Helvetica 20182611
=Juncus tenuis Willd.Index synonymique 1996220000
=Juncus tenuis Willd.Landolt 1977588
=Juncus tenuis Willd.Landolt 1991515
=Juncus tenuis Willd.SISF/ISFS 2220000
=Juncus tenuis Willd.Welten & Sutter 19822145

= 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   -  -

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 in einer Reihe. Epidermiszellen verholzt.

Description

Culm-diameter 1-2 mm, wall very large, radius of culm in relation to wall thickness approximately 1:0.75. Outline circular with a smooth surface. Center hollow and surrounded by many large thin-walled, not lignified cells. Without cortex/cylinder separation. Epidermis smooth. Epidermis thin-, peripheral thicker-walled (lignified). Large vascular bundles arranged in one peripheral row. Small or rudimentary vascular bundles mainly at the periphery. Chlorenchyma present, continuous peripheral belt with unlignified round cells (like a large cortex). Vascular bundles collateral closed. Sclerenchymatic sheath around vascular bundles circular large, 3 to x cells. Vessels arrangement in vascular bundles in lateral position. Largest vessel in the bundle 20-50 μm. Distinct cavities (intercellulars) in the protoxylem area of vascular bundles.