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| minute rootless aquatic herbs having globular fronds floating on or near the water surface and bearing one flower per frond ❲Wolffia❳ | |||
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| minute rootless aquatic herbs having flat fronds floating on or below the water surface and bearing 1-2 flowers per frond; minute rootless aquatic herbs having flat fronds floating on or below the water surface and bearing 1-2 flowers per frond; America and Africa ❲Wolffiella❳ |