Common Duckweed - Lemna minor


    Fronds pale green, rounded to oval, 1.5 mm, opaque, floating, flat, 3 veined. Linked by an inconspicuous stalk or separate and with a single root.

    Similar Species

    Other Lemna, especially L minuta, which has only one vein on the frond

    Identification difficulty
    ID guidance

    Only use well-grown material in summer.  Ovate (widest near middle), no red pigmentation, 3 or more obscure veins on underside

    Recording advice

    Photo of summer leaf frond underside, with veins


    Lakes, ponds, ditches and backwaters - even in cattle troughs.

    When to see it

    May to July.

    Life History


    UK Status

    Common throughout Britain except the north of Scotland.

    VC55 Status

    Common in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 405 of the 617 tetrads. 

    It is probably over-recorded instead of L minuta.

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    Leicestershire & Rutland Map

    MAP KEY:

    Yellow squares = NBN records (all known data)
    Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

    UK Map