Polypogon viridis (Gouan) Breistr.

Water Bent

Bull. Soc. Bot. France 110 (Sess. Extr.): 56 (1966) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Stoloniferous perennial, culms ascending to erect, to 100 cm high. Leaf-blades flat, scabrous on both surfaces, to 15 cm long and 5 mm wide; sheaths smooth; ligules membranous, truncate, to 5 mm long. Inflorescence a rather dense panicle of several whorls of branchlets, the lower usually somewhat distant from the upper, to 12 cm long and 4 cm wide; glumes broadly acute, scabrous, sometimes ciliate along margins, 1.5–2.5 mm long; lemma ovate, c. 1 mm long, membranous, shallowly dentate; palea subequal to lemma. Flowers Sep.–Mar.

*CVU, *GipP, *Gold, *HSF, *OtP, *VVP. WA, SA, Qld, NSW, Tas. Native to the Mediterranean, but widely naturalised in temperate regions (e.g. Central Asia, South Africa, the Americas, New Zealand). Known from a few scattered localities, mostly in southern Victoria, e.g. Nhill, Hamilton, Essendon, Wonthaggi, Orbost, but probably more widespread. A weed of damp or wet sites, e.g. irrigation ditches, roadside drains etc. Sometimes treated as Agrostis viridis Gouan due largely to the lack of awned glumes (a feature of Polypogon), but the persistent glumes and features of the lemma epidermis (the 'trichodium net') unite it with Polypogon. Molecular studies (e.g. Saarela et al. 2017) also support its placement in Polypogon.

Source: Walsh, N.G. (1994). Poaceae. 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: Neville Walsh, 2019-06-12

Saarela, J.M., Bull, R.D., Paradis, M.J., Ebata, S.N., Peterson, P.M., Soreng, R.J., Paszko, B. (2017). Molecular phylogenetics of cool-season grasses in the subtribes Agrostidinae, Anthoxanthinae, Aveninae, Brizinae, Calothecinae, Koeleriinae and Phalaridinae (Poaceae, Pooideae, Poeae, Poeae chloroplast group 1), Phytokeys 87: 1-139.

Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Poales
family Poaceae
genus Polypogon
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Polypogon viridis in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Polypogon viridis in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present naturalised
Gippsland Plain present naturalised
Otway Plain present naturalised
Goldfields present naturalised
Central Victorian Uplands present naturalised
Highlands-Southern Fall present naturalised

State distribution

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