Perennial, aquatic, often slender herb. Rhizome woody, fibre-covered, 5–12 mm thick. Tubers near-globular to broadly obovoid, 8–38 mm long, 4–14 mm diam.; terminating roots c. 1–11 cm long. Leaves either ± linear or terete, floating to erect, to 75 cm long and 15 mm wide, spongy basally; basal sheath tapered; T.S. of linear leaves c. 3 cm below sheath summit ± plano-convex, with width of spongy portion c. 2.5–3.8 times its thickness, the sheath margins not meeting across blade face. Scape at fruiting c. 23–67 cm long, 1–8 mm diam. Infructescence a raceme, 4–38 cm long, 13–25 mm diam.; pedicels 1.3–5 mm long. Fruits c. (15–) 39–250 per infructescence, loosely to not touching, variable, 8.3–21.1 mm long, 5.5–8.8 mm wide. Carpels 2–6, all maturing or some aborting; central axis absent; mature carpels free, erect to semi-outspread, ± lanceoloid, circular in T.S., lacking ridges or with inconspicuous broad-convex dorsal ridges.
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A small herb. It has grass-like leaves. It grows in water. Under the ground it forms small tubers. It keeps growing from year to year.
Occurs usually in saturatedsoils or still ephemeral fresh water to 50 cm deep, in swamps, creeks andfloodplains; also in water to 2 m deep or strong-flowing streams in the tropics.Typically in Eucalyptus largiflorens/Muehlenbeckia florulenta (BlackBox/Lignum) sites in N.S.W. and Vic.; in varied associations elsewhere.
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A tropical plant. It can grow in tropical and warm temperate places. It occurs in wet or swampy areas. It grows in freshwater and nears springs.
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