River Water-crowfoot - Ranunculus fluitans

    Description

    Dark blackish-green plant with submerged leaves only, with a few very long parallel segments, collapsing out of water. Flowers white, large 20 to 30 mm petals overlapping.

    Similar Species

    Other crowfoots, especially R penicillatus subsp. pseudofluitans

    Identification difficulty
    ID guidance

    Ref. key in Stace.  The differences between species in this difficult subgenus are hard to tell from a photo.  Details of the flower petals and nectaries, and of the two types of leaf, are needed.  Capillary leaves are thread like, usually but not always submerged; and laminar are 'normal', usually floating or terrestrial, but not always.

    Recording advice

    Photograph: in habitat, of both kinds of leaf, and a close-up of flower.  Take a specimen, including both types of leaf, if present, and retain it until your record is verified; you may need to send the specimen to the County Recorder.  An explanation of how it fits the key in Stace is needed.

    Habitat

    Fast flowing fresh water, rivers and streams.

    When to see it

    June to August.

    Life History

    Perennial.

    UK Status

    Found from southern Scotland southwards, but rare in Wales and south-western England.

    VC55 Status

    Occasional in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 23 of the 617 tetrads.

    It is listed as Native and Frequent in west, rare or absent elsewhere, in the current VC55 Checklist (Jeeves, 2011)

    Leicestershire & Rutland Map

    UK Map