Lemna L.

Roots never more than 1 on each cladode Lemna

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Floating on the surface. Cladodes thick, opaque, broad-ovate to elliptic, 1–4 mm long, stalkless. In still water. Widespread but uncommon in the area. Fl. summer Lemna disperma

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Floating beneath the surface. Cladodes thin, translucent, narrow-oblong to lanceolate, 2–8 mm long, stalked when mature. Picton Lakes; Eastlakes. In still water Lemna trisulca