Posidonia australis Hook.f.

Fibre-ball Weed

Fl. Tasman. 2: 43 (1858) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: rare (r)

Rhizomes and older stems covered with fibrous remains of decaying leaf-sheaths. Leaves 2 or 3(or 4) per shoot; sheaths overlapping for about one-third of their length, persistent; ligule 0.5–1 mm long; auricle 3–4 mm long; lamina (15–)20–50(–90) X 0.5–1.5(–2) cm. Inflorescence borne about the same height as, or extended above, the canopy of leaves on an axis 15–45(–60)cm long. Flowers (2–)4(–6) per spike. Stamens with anther connective ovate, extended beyond locules, persistent and bract-like at base of fruit.

GipP, OtP, WPro. Also WA, SA, NSW, Tas. In Victoria, only recorded from Barwon Heads, Jack Smith Lake and Corner Inlet. It grows in shallow water up to c. 15 m deep, in sandy soil with rhizomes just below the substrate surface.

Source: Conn, B.J. (1994). Posidoniaceae. 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: Daniel Ohlsen, 2017-04-26
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Alismatales
family Posidoniaceae
genus Posidonia
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Posidonia australis in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Posidonia australis in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Gippsland Plain present native
Otway Plain present native
Wilsons Promontory present native

State distribution

Distribution map
Western Australia
South Australia
New South Wales
Australian Capital Territory