Juncus acuminatus Michx.

Fl. Bor.-Amer. 1: 192 (1803) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Tufted, sometimes shortly rhizomatous perennial. Culms erect, 30–85 cm high. Leaves cauline and basal; blade hollow, with ± conspicuous transverse septa, very rarely exceeding the culms, compressed or terete, c. 1–3 mm wide, apex acute or obtuse; auricles usually obtuse, to c. 3 mm long. Inflorescence of 5–70(–100) usually discrete clusters, each with 4–20 (rarely more) flowers, 5–8 mm wide in fruit; primary bract shorter than inflorescence; prophylls absent. Tepal midrib green, turning light brown, margins pale, membranous, the ± curved tips often tinged reddish-brown; outer tepals (2.5–)2.8–3.5 mm long, acuminate; inner shorter or sub-equal to outer, acuminate. Stamens 3, anthers 0.5–0.7 mm long. Capsules light brown to red-brown, slightly 3-angled in the upper half at maturity, narrowly ovoid, c. 2.5–3.5 mm long, shorter than or subequal to tepals, tapering to a broadly acute and shortly mucronate tip; seeds c. 0.3–0.4 mm long, slightly asymmetrical, very fine longitudinal and transverse ridges discernible at moderately high magnification, minutely apiculate at each end. Flowers recorded Jan., fruiting period unknown.

*EGU, *GipP, *HNF, *MuM, *NIS, *VRiv. Also naturalised in NSW, Tas. Native to North and South America. Naturalised in New Zealand. Known in Victoria from a few recent (1980-2011) collections in the Walwa, Tubbut, Lake Nagambie, and Tonimbuk areas.

Similar to Juncus holoschoenus, but differs in its smaller seeds, fewer stamens and generally smaller fruit clusters.

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, 2018-01-08
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 acuminatus in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Juncus acuminatus in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present naturalised
Victorian Riverina present introduced
Gippsland Plain present naturalised
Northern Inland Slopes present introduced
East Gippsland Uplands present introduced
Highlands-Northern Fall present naturalised

State distribution

Distribution map
New South Wales