Vallisneria annua S.W.L.Jacobs & K.A.Frank

Submerged, tufted, stoloniferous annual. Leaves basal, to c. 50 cm long, (1.5–) 2–7 (–10) mm wide, long-acute and finely tapering at apex, sometimes with 1 main central nerve or 3–8 longitudinal nerves; margins usually finely toothed. Male spathe ovate, (2.7–) 7–10 mm long, 2.2–6 mm diam. Male flowers

Grows in shallow running water or ephemeralpools or billabongs, occasionally in more perennial habitats.