Short- or long-rhizomatous perennial, forming tufts or swards, often red-tinged. Culms decumbent, rarely erect, new shoots often arising from nodes, to c. 50 cm high. Leaves arising from culms and creeping stems; blade hollow, with conspicuous transverse septa, usually shorter than culms, terete or slightly compressed, c. 0.5–2 mm wide, apex broadly acute to obtuse; auricles usually obtuse, up to c. 2 mm long. Inflorescence of 4–40(–60) usually discrete clusters, each with 2–13(–25) flowers, 5–9 mm wide when in fruit; primary bract shorter than inflorescence; prophylls absent. Tepal midrib green, soon becoming strongly reddish-brown, margins pale; outer tepals 2–3 mm long, acute; inner equal to or slightly shorter than outer, acute or obtuse; stamens 6, anthers 0.5–0.9 mm long. Capsules dark brown or red-brown to almost black (at least in upper half), occasionally dark golden-brown, trigonous-ovoid, 2.5–4 mm long, exceeding tepals, tapering gradually or contracted rather abruptly to a distinct mucro to c. 0.8 mm long; seeds 0.4–0.6 mm long, slightly asymmetrical, finely reticulate-patterned discernible at moderately high magnification, minutely apiculate at each end. Flowers mostly Nov.–Mar., seeds shed mostly Dec.–Jun.
*CVU, *DunT, *EGL, *EGU, *GipP, *Glep, *Gold, *GGr, *HNF, *HSF, *MonT, *MuF, *NIS, *OtP, *OtR, *SnM, *Strz, *VAlp, *VRiv, *VVP, *WaP, *WPro, *Wim. A common weed of creeks, rivers, swamps, irrigation channels, moist pastures and other soakage areas at a range of altitudes throughout Victoria.
Some authors (e.g. Snogerup 1980) report tepal lengths of up to 3.5 or 4 mm for Juncus articulatus. Of the numerous specimens examined here, none were found to have tepals exceeding 3 mm.
|Bioregion||Occurrence status||Establishment means|
|Victorian Volcanic Plain||present||naturalised|
|Central Victorian Uplands||present||naturalised|
|Northern Inland Slopes||present||naturalised|
|East Gippsland Lowlands||present||naturalised|
|East Gippsland Uplands||present||naturalised|