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Juncus compressus Jacq.

Roundfruit rush (en), Jonc à tiges comprimées (fr), Jonc comprimé (fr)

Species

Angiosperms > Poales > Juncaceae > Juncus

Characteristics

Herbs, perennial, to 8 dm. Rhizomes short-creeping or densely branching, if densely branching herb appearing cespitose. Cataphylls 1--3. Leaves basal and cauline, 1--2; auricles 0.3--0.5 mm, scarious to membranous; blade flat to slightly channeled, 5--35 cm x 0.8--2 mm, margins entire. Inflorescences 5--60-flowered, lax, loose to moderately congested, 1.5--8 cm; primary bract usually exceeding inflorescence. Flowers: bracteoles 2; tepals brownish, ovate to oblong, 1.7--2.7 mm; inner and outer series nearly equal, apex obtuse; stamens 6, filaments 0.5--0.7 mm, anthers 0.6--1 mm; style 0.3 mm. Capsules brown or darker, pseudo-3-locular, widely ellipsoid to obovoid, 2.5--3.5 x 1.4--1.8 mm, exceeding tepals. Seeds light brown, ellipsoid to lunate, 0.35--0.556 mm, not tailed. 2n = 44.
More
Much like no. 1 [Juncus gerardii Loisel]; primary invol bract usually surpassing the infl; tep oblong to obovate, obtuse, light brown with greenish midstrip and membranous margin, the sep 2–2.5 mm; stamens 6, extending to about the middle of the tep or a bit beyond, the anthers up to ca 1 mm, 1–2 times as long as the filaments; fr obovoid-globose, 2.1–2.6 mm, short-beaked, obviously surpassing the sep; 2n=40, 44. Wet meadows and salt-marshes; native to Europe, now irregularly established from Nf. to Me. and N.H., w. to Wis., Minn., Mont., and Utah.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention evergreen
Sexuality hermaphrodite
Pollination anemogamy
Spread epizoochory
Mature width (meter) -
Mature height (meter) 0.7 - 0.8
Root system creeping-root rhizome
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Light 4-9
Soil humidity 6-8
Soil texture 1-4
Soil acidity 1-7
Soil nutriment -
Hardiness (USDA) 5-7

Usage

Uses medicinal
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by divisions or seedlings.
Mode divisions seedlings
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -29
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Leaf

Juncus compressus leaf picture by Txasko Ander (cc-by-sa)

Flower

Juncus compressus flower picture by Erik Berkhof (cc-by-sa)
Juncus compressus flower picture by Jennifer Soukup (cc-by-sa)
Juncus compressus flower picture by Peter V (cc-by-sa)

Fruit

Juncus compressus fruit picture by Alexander Baransky (cc-by-sa)
Juncus compressus fruit picture by Jacques Maréchal (cc-by-sa)
Juncus compressus fruit picture by Stéphane Mars (cc-by-sa)

Distribution

Juncus compressus world distribution map, present in Afghanistan, Albania, Argentina, Armenia, Austria, Azerbaijan, Belgium, Bulgaria, Bosnia and Herzegovina, Belarus, Canada, Switzerland, Czech Republic, Germany, Denmark, Spain, Estonia, Finland, France, United Kingdom of Great Britain and Northern Ireland, Georgia, Greece, Croatia, Hungary, Iraq, Italy, Kazakhstan, Kyrgyzstan, Liberia, Liechtenstein, Lithuania, Luxembourg, Latvia, North Macedonia, Malta, Montenegro, Mongolia, Netherlands, Norway, Pakistan, Poland, Portugal, Romania, Russian Federation, Serbia, Slovakia, Slovenia, Sweden, Tajikistan, Turkmenistan, Turkey, Ukraine, Uruguay, United States of America, Uzbekistan, and South Africa

Conservation status

Juncus compressus threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:442830-1
WFO ID wfo-0000776221
COL ID 3QTLJ
BDTFX ID 36476
INPN ID 104155
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Juncus compressus f. laxus Juncus compressus f. longirepens Juncus compressus f. euxinus Juncus comppressus f. alpinus Juncus gramineus Juncus metzleri Juncus bulbosus var. compressus Juncus compressus var. dianthelus Juncus compressus var. euxinus Juncus compressus var. nudiculmis Juncus compressus var. pseudogerardii Juncus bulbosus var. alpinus Juncus compressus f. elongatus Juncus compressus f. tenuifolius Juncus compressus
WorldFloraDB 2024