Najas marina L.

Sp. Pl. 1015 (1753) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: vulnerable (v)


Some authorities distinguish subspecies within Najas marina but this distinction is not followed in VicFlora. The sole Victorian record has been attributed to subsp. armata (H.Lindb.) Horn.

Herb up to 3 m long; dioecious. Leaves 20–50 × 2–5 mm, length to width ratio 7.5–15; sheath truncate to blunt distally, auricles absent; lamina margin with teeth c. 0.6–0.7 mm long; dorsal surface with 1–many teeth; leaf-sheath scales blunt and often asymmetrical. Flowers solitary. Male flowers with outer cup-like structure 3–4 mm long. Female flowers 1.9–4 mm long; stigmas 2–4.

EGL. Also WA, NT, Qld, NSW. Tropical and warmer parts of Europe and Africa, to Japan and Malesia (excluding New Guinea), North and South America. Only one recent collection in Victoria, from the brackish Swan Lake, east of Sydenham Inlet, East Gippsland. Extensive subsurface growth of this species can interfere with boating and fishing (Sainty & Jacobs 1981).

Source: Conn, B.J. (1994). Najadaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne.
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Alismatales
genus Najas
Higher taxa
species Najas marina L.


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Najas marina in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Najas marina in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
East Gippsland Lowlands present native

State distribution

Distribution map
Western Australia
Northern Territory
New South Wales