Isolepis R.Br.
Stamens mostly 1 or 2, rarely 3. Spikelets usually with a continuing bract
Spikelet solitary, 3–8 mm long. Nut greyish, c. 1.5 mm long. Lowest glume empty, only rarely produced into a linear lamina longer than the spikelet. Stamens 2, rarely 3. Usually aquatic, often with long narrow leaves rhizomes and culms. When on mud, the leaves are up to 1 mm wide and the culms more erect. Widespread. In water or on wet mud Isolepis fluitans
Spikelets usually more than 1 in each cluster; basal bract apparently continuing the culm, 2–3(5) mm long. Stamens 1 rarely 2. Nut yellowish or brownish, c. 1 mm long. Leaves linear, less than 1 mm wide; innermost leaf ensheathing each culm and usually reduced to a sheath alone or with a mucro. Erect herb with rhizome, often proliferating. Widespread. Wet places Isolepis inundata