Mayweed, Scentless

Information on Scentless Mayweed

Common Name: Scentless Mayweed
Scientific Name: Tripleurospermum inodorum
Irish Name: MeĆ” drua
Family Group: Asteraceae
Distribution: View Map (Courtesy of the BSBI)
Flowering Period

Click for list of all flowering by month
Scentless Mayweed could sometimes be confused with:

Mayweed Sea, Mayweed, Scented,

Scentless Mayweed is a species which grows in abundant masses in arable fields and on cultivated and disturbed ground. The plants grow to about 75cm, bearing daisy-like flower-heads (20-40mm across) which have yellow disc florets at their centre and white ray florets around. These flower-heads are solitary, on long-stalked, straggling and branching stems. The plants are not aromatic (like Scented Mayweed). The leaves are alternate, feathery and much divided into very fine, narrow segments. This is a native perennial, more common in the South, East and North East of Ireland. It flowers from April until October and belongs to the Asteraceae or Daisy family. 

I first saw and photographed this species growing in fields along the New Line Road in Co Wexford in 2013. The fields were so full of these flowers that it looked as if there had been a fall of snow!

If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre

The main feature which identifies this species from Scented Mayweed is the receptacle at the centre of the flower-head. In this species it is solid – you can pull it apart with your thumbnail to check. In Scented Mayweed the receptacle of yellow disc florets is hollow. See the picture below. 

Mayweed, Scentless
Mayweed, Scentless
Mayweed, Scentless
Mayweed, Scentless