Juncus tenuis Willd.

Slender Rush

Sp. Pl., edn 5, 2: 214 (1799) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Tufted, shortly rhizomatous perennial. Culms erect, 10–60(–80)cm high, each with up to c. 5 leaves and 1–3 cataphylls towards the base. Leaf-blades solid, longer or shorter than culms and 0.5–2 mm wide, flat or shallowly channelled above, apex truncate and usually irregularly toothed, rarely acute; auricles obtuse, to c. 6 mm long in the upper leaves (shorter below). Inflorescence with flowers usually well spaced, occasionally congested (but not forming well-defined clusters); 1–several leaf-like bracts exceeding the inflorescence, often two more than 5 cm long; prophylls present. Tepals with broad green midrib when young, margins pale, membranous; outer tepals 3–5 mm long, acute to acuminate; inner shorter than or subequal to the outer; stamens 6, anthers 0.3–0.6 mm long. Capsules light brown at maturity, ovoid, c. 2.5–3.5 mm long, obtuse and shortly mucronate, shorter than or subequal to the tepals; seeds c. 0.3–0.5 mm long, slightly asymmetrical, with very fine longitudinal and transverse ridges discernible at high magnification, minutely apiculate at one or both ends. Flowers mostly Nov.–May, seeds shed mostly Jan.–Jul.

*EGL, *EGU, *GipP, *HNF, *HSF, *NIS, *OtP, *OtR, *Strz, *VAlp, *VRiv, *VVP. Also naturalised in NSW, Tas. Native to temperate North America. Occurs in disturbed lowland sites (e.g. moist paddocks), but is more common at higher altitudes within disturbed moist areas in wet sclerophyll forests and subalpine woodlands.

Source: Albrecht, D.E. (1994). Juncus. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2019-03-04
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Poales
family Juncaceae
genus Juncus
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Juncus tenuis in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Juncus tenuis in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present introduced
Victorian Riverina present naturalised
Gippsland Plain present naturalised
Otway Plain present introduced
Northern Inland Slopes present introduced
East Gippsland Lowlands present naturalised
East Gippsland Uplands present introduced
Highlands-Southern Fall present naturalised
Highlands-Northern Fall present naturalised
Otway Ranges present naturalised
Strzelecki Ranges present introduced
Victorian Alps present naturalised

State distribution

Distribution map
Western Australia
New South Wales
Australian Capital Territory