Juncus ingens N.A.Wakef.

Giant Rush

Victorian Naturalist 73: 211 (1957) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Dioecious perennial with horizontal or ascending rhizomes. Cataphylls pale to dark brown towards the base, to 40 cm or more long. Culms erect, dull green, (1.5–)2–5m high and 4–10 mm diam.; striations c. 100–200, crowded, not strongly raised; pith interrupted throughout or continuous (and dense) at base and interrupted above; stomates superficial. Inflorescence large, lax, many-flowered with flowers scattered along fine branchlets; primary bract continuous with culm, to c. 50 cm long; prophylls present. Tepals stramineous, 1.6–2.6 mm long in male flowers, 1.5–2.0 mm in female flowers; stamens 6, anthers c. 1–1.5 mm long, reduced to staminodes in female flowers. Capsules equal to or exceeding the tepals, straw colour to light brown, 1.5–2 mm long. Flowers mostly Oct.–Jan., seeds shed mostly Dec.–Apr.

CVU, DunT, EGL, EGU, GipP, Gold, GGr, HNF, HSF, MuF, NIS, VRiv, VVP, WaP, Wim. Also NSW. Usually forms extensive pure stands on heavy soils within and on the margins of lakes, billabongs and drainage channels.

Sometimes robust specimens of Juncus procerus are misdetermined as J. ingens, but the two are readily separated on sexuality, inflorescence form, and tepal, anther and capsule size. Hybrids with J. pallidus are known.

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 ingens in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Juncus ingens in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Fans present native
Gippsland Plain present native
Warrnambool Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native

State distribution

Distribution map
New South Wales