Juncus dubius Engelm.

Questionable rush (en)

Species

Angiosperms > Poales > Juncaceae > Juncus

Characteristics

Herbs, perennial, rhizomatous, 3--7.5 dm. Rhizomes 2--3 mm diam., not swollen. Culms erect, terete, 2--4 mm diam., smooth or rugulose. Cataphylls 1--2, pink to straw-colored, apex acute. Leaves: basal 1--2, cauline 1--2; auricles 1--4.9 mm, , apex rounded, membranaceous; blade green to straw-colored, terete, 20--30 cm x 1.5--4 mm, rugulose or smooth. Inflorescences terminal panicles of 25--66 heads, 7--13 cm, branches spreading; primary bract erect; heads 6--10-flowered, hemispheric to obovoid, 5--10 mm diam. Flowers: tepals straw-colored to brown, lanceolate, apex acuminate; outer tepals (2--)2.5--3.4 mm; inner tepals (2--)2.6--3.6 mm; stamens 6, anthers 1.5--2 times filament length. Capsules exserted, chestnut brown, 1-locular, subuloidsubulate, (2.4--)3--3.9 mm, apex tapering to subulate tip, valves separating at dehiscence. Seeds obovoid, 0.3--0.4 mm, not tailed. 2n = 40.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention evergreen
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.3 - 0.75
Root system rhizome
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light 4-9
Soil humidity 5-7
Soil texture 1-2
Soil acidity 1-5
Soil nutriment -
Hardiness (USDA) -

Usage

Uses -
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°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Juncus dubius unspecified picture

Distribution

Juncus dubius world distribution map, present in Mexico and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:442903-1
WFO ID wfo-0000776334
COL ID 3QTNC
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Juncus dubius Juncus rugulosus Juncus dubius f. rugulosus