Round-leaved Crowfoot - Ranunculus omiophyllus

    Alt Name
    Round-leaved Ranunculus
    Description

    The white flowers are typical of other Crowfoots. In Ranunculus omiophyllus they measure about 8 to 12 mm, the petals at least twice as long as the sepals. The leaf lobes are narrowed at the base.

    Similar Species

    Other crowfoots

    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

    It grows in shallow water or on wet soil. Typical sites include the margins of ponds and ditches, flushes, damp depressions, gateways and tracks in pastures and on heathland, and the sheltered backwaters of rivers. Unlike Ranunculus hederaceus, it is confined to acidic, mesotrophic or oligotrophic soils.

    When to see it

    Flowers April to August.

    Life History

    Annual or short-lived perennial.

    UK Status

    Ranunculus omiophyllus remains frequent in W. Britain and S. Ireland, where there are many more records than there were in the 1962 BSBI Atlas. The decline at the fringes of its range was already discernible in the 1962 Atlas, and is now much more marked.

    VC55 Status

    Scarce in Leicestershire and Rutland where it is almost confined to the Charnwood area. In the 1979 Flora survey of Leicestershire it was found in 8 of the 617 tetrads. 

    It is listed as Scarce in the current Checklist (Jeeves, 2011) and is on the VC55 Rare Plant Register

    Leicestershire & Rutland Map

    UK Map