Common duckweed  (Lemna gibba)

Common duckweed leaf
Common duckweed leaf
© G. I. Bernard / www.nhpa.co.uk		Common duckweed
Common duckweed
© John Clegg / www.ardea.com		Common duckweed roots visible
Common duckweed roots visible
© www.osfimages.com
Common duckweed
Common duckweed
© R. V. Lansdown		Common duckweed at water surface
Common duckweed at water surface
© Barrie Watts / www.osfimages.com		Common duckweed, view from underneath water
Common duckweed, view from underneath water
© www.osfimages.com