Potamogeton L. >

Inflorescence usually more than 2-flowered. Carpels 4. Mature fruit ± sessile Potamogeton
Leaves sessile or nearly so, all alike, submerged, membranous
Leaves narrow- to broad-ovate or almost orbicular, 1–4 cm long, cordate and stem-clasping, with 5–7 strong longitudinal veins and fainter intermediate veins. Spikes 1–2 cm long; peduncles longer than the leaves. Fruiting carpels scarcely beaked. Nepean River. Fl. spring–summer Potamogeton perfoliatus