Isolepis R.Br.

Plants in tufts or with a filiform rhizome; nut without hypogynous disc at base Isolepis

Stamens mostly 3. Spikelets solitary without a continuing bract or only with short ones. Culms weak, floating or creeping

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Glumes reddish-purple at least on the margins. Spikelets 2–3 mm long, 1–1.5 mm wide. Anthers 1.5–3 mm long. Trailing aquatic plants with long culms and floating linear leaves. Widespread. Streams Isolepis producta

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Glumes greenish or brownish. Spikelets 5–8 mm long, 3–4 mm wide. Anthers 0.9–1.2 mm long. Usually in swamps or on mud but sometimes aquatic in streams. More robust than I. producta. Widespread. Wet places Isolepis crassiuscula