Scentless Mayweed - Tripleurospermum inodorum

    Description

    Erect, branched low to medium plant with feathery leaves. Flowerheads are white with a yellow disc, not aromatic, the white rays not reflexing fully after opening, and the disc cone not hollow.

    Similar Species

    Scented Mayweed (Matricaria chamomilla) and Chamomiles (Anthemis and Chamaemelum nobile)

    Identification difficulty
    ID guidance

    There is a very common and similar white daisy of waste ground and arable margins - Scented Mayweed (Matricaria recutita (synonym = M. chamomilla).  Both species can be aromatic.  The best way to tell is to slice through the boss of yellow florets (the receptacle) in the centre of the flower with your thumbnail; Scented Mayweed has a definitely hollow receptacle and Scentless Mayweed has a more or less solid receptacle. 

    Chamomile (Chamaemelum nobile), Corn Chamomile (Anthemis arvensis), Stinking Chamomile (Anthemis cotula) and Austrian Chamomile (Cota austriaca (synonym = Anthemis)) have all been recorded in VC55, but are scarce or very rare; a specimen will be needed to verify them.  They all have scales among the yellow florets on the receptacle, unlike Matricaria or Tripleurospermum.  Corn or Austrian Chamomile are often included in seed-mixes of cornfield annuals, and are occasionally naturalised.

    Recording advice

    A photograph of the whole plant, with detail of sliced-through receptacle

    Habitat

    Cultivated and arable land, waste ground.

    When to see it

    July to September.

    Life History

    Annual.

    UK Status

    Common throughout much of Britain, but scarcer in the north.

    VC55 Status

    Very common in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 600 of the 617 tetrads.

    Leicestershire & Rutland Map

    UK Map