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.
WaP, 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., Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons, pp. 155–156. Inkata Press, Melbourne.
