R. Mason, New Zealand J. Bot. 5:524, figs 1 & 2 (1967).
Synonymy: R. maritima sensu H. Aston, Aquatic plants of Australia, 290 (1973), partly, auct. non L.; R. spiralis sensu Jessop in J. Black, Fl. S. Aust. 80 (1978), partly, auct. non L. ex Dumort.
Common name: Widgeon grass.
Rhizomatous annual or perennial; stems usually to 20 sometimes to 40 cm long, occasionally inconspicuous; leaves filiform, 5-15 mm long, usually less than 0.5 mm broad; apices obtuse to acute; turions formed in some ephemeral habitats.
Inflorescence 2-flowered, surface-pollinated; peduncle usually less than 1 m long, coiling after pollination; carpels 2-16 (mostly 4-8), initially subsessile, stalk lengthening to 2 cm with a slender straight base 0.2-0.4 mm wide at its attachment to the endocarp.
Fruiting carpels slightly asymmetrical, 2-3 mm long, 0.5-0.8 mm wide; endocarp with a stylar beak less than 0.5 mm long and an elliptic or narrow-elliptic perforation on each side.
Sainty & Jacobs (1981) Waterplants of New South Wales, p. 396.
In fresh to hypersaline coastal lakes, lagoons and estuaries.
S.Aust.: EP, MU, SL, KI, SE. W.Aust.; N.S.W.; Vic.; Tas. New Zealand.
Flowering time: Sept. — Nov.
SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia
Seeds, turions and leaves consumed by water birds.
Not yet available