Elatine gratioloides A.Cunn.

Weak glabrous annual herb, prostrate to decumbent, mat-forming when growing in wet mud or stems ascending to c. 40 cm high when growing as an aquatic; stems rooting at least at lower nodes. Leaves opposite, with short or indistinct petioles, lamina ovate, lanceolate or elliptic, rarely oblong, 2–20 mm long, 0.8–5 mm wide (on submerged plants the leaves are longer and usually more lanceolate, and the internodes longer, than in plants growing in wet mud), with 1 apical and 1–several marginal hydathodes, venation often evident in fresh material, apex obtuse to acute; stipules membranous to somewhat herbaceous, c. ovate, [This description is based on specimens collected throughout the N.T. and may require revision-Editor, October 2021.]

Grows on mud and in shallow freshwater, in swamps, lagoons, streams, drainage channels and temporary ponds, clay pans; margins of wetlands; also with rice crops. Occurs predominantly in or beside permanent or semi-permanent waterhole, rock holes.