Juncus roemerianus Scheele

Needlegrass rush (en)

Species

Angiosperms > Poales > Juncaceae > Juncus

Characteristics

Stout, rigid, erect, gyno-dioecious, colonial perennial from long rhizomes, mostly (4–)10–15(–20) dm; basal sheaths inflated, mostly bladeless, only the inner ones bearing rigid, erect, terete blades about as long as or longer than the stem, the plants otherwise lfless except for the erect invol lf, this up to 3(–9) dm and appearing like a continuation of the stem; infl apparently lateral, 2–45 cm, usually with numerous repeatedly forked, spreading branches, each branchlet terminated by 2–6 sessile, 2–8-fld glomerules that are subtended by short, ovate bracts; fls not prophyllate, the perfect ones with pale brown, glossy, indurate tep ca 4 mm, the 6 stamens nearly as long, with anthers ca 5 times as long as the filaments, the fls producing relatively few good seeds; pistillate fls with shorter, red-brown tep ca 3 mm, short staminodes, and long red stigmas, the abruptly short-acuminate frs trilocular, ca 5.5 mm, much surpassing the tep, the seeds obovoid, 0.4–0.6 mm; 2n=18. Tidal marshes from s. N.J. to Fla. and Tex.
More
Herbs, perennial, 5--15 dm. Rhizomes long, thick, scaly. Culms gray-green, 2--5 mm diam. Cataphylls 2--5. Leaves basal, 1--3; auricles absent; blade terete, 40--80 cdm x 1.5--2.5 mm. Inflorescences sympodial or appearing lateral, glomerules to 150, each with 2--6 perfect or pistillate flowers, congested to open, 4--20 x 5--10 cm; primary bracts terete, longer than inflorescence. Flowers: tepals pale brown, 2.5--3.3 mm, apex acuminate; outer series acuminate; inner series slightly shorter, acutish; stamens 6, sometimes rudimentary, filaments 0.2--0.7 mm, anthers 1.3--2.5 mm; style 0.3--1 mm. Capsules brown, 3-locular, ovoid to oblate, 1.7--3 x 1.3--1.6 mm, mostly distinctly shorter than perianth, apiculate. Seeds dark brown, ellipsoid, 0.4--0.6 mm, not tailed.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention evergreen
Sexuality
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 1.0 - 1.5
Root system rhizome
Rooting depth (meter) 0.4
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Light 7-8
Soil humidity 7-8
Soil texture 1-2
Soil acidity 1-6
Soil nutriment -
Hardiness (USDA) 4-11

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 roemerianus unspecified picture

Distribution

Juncus roemerianus world distribution map, present in Bahamas, Bermuda, Haiti, and United States of America

Conservation status

Juncus roemerianus threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:443432-1
WFO ID wfo-0000777173
COL ID 6NGWF
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Juncus roemerianus