SEA MAYWEED

Tripleurospermum maritimum

Daisy & Dandelion Family [Asteraceae]

month8jun month8june month8jul month8july month8aug month8sep month8sept

status
statusZnative
flower
flower8white
inner
inner8yellow
morph
morph8actino
petals
petalsZMany
stem
stem8angular

27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Just above the strand-line on the foreshore.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
With Sea Rocket just behind. Un-like Scentless Mayweed, which looks very similar, Sea Mayweed is almost always confined to the coast, and more often than not on or near the highest drift-line or in the spray-zone on the sea-walls and sea-cliffs. It is a halophyte, able to tolerate salt as are many plants thriving near the drift-line.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Inhabits shingle and other bare places near the sea. There is significant variation in the morphology of Sea Mayweed regarding stems and leaf thickness.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Sea Mayweed is usually stouter and spreads further than does Scentless Mayweed.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Flowers a large 30 - 45mm across, leaves fine and feathery.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Stems grow to 40cm and are sturdy and branched, with branched and wiry leaves.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
White ray-florets surround a dense cluster of yellow disc-florets.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Disc-florets form a hemispherical dome. Ray florets often swept backwards slightly.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
About 20-30 fairly broad oval white ray florets, and a dense mass of yellow disc-florets in the centre.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Many overlapping sepal bracts.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Sepal-like bracts are brown-edged and semi-translucent as are those of Scentless Mayweed and Corn Chamomile, but not those of the similar Scented Mayweed, Stinking Chamomile or Chamomile.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Leaves many branched and wire-thin. Stems often purplish, un-like those of Scented Mayweed.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Stems sturdy, variously square or angular with purplish edges. Leaves adjoin the stem by a flattish almost succulent stem that gradually tapers and branches, the branches also being branched.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Leaves join the main stem wrapping itself about half-way around that stem.


27th July 2012, Marshside, Sefton Coastline, Lancs. Photo: © RWD
Flower buds in various stages.


Easily mistaken for : Scentless Mayweed [see captions].

Hybridises with : Scentless Mayweed (Tripleurospermum inodorum) to produce Tripleurospermum maritimum × inodorum but which occurs in only very few hectads, none around the Sefton Coastline.

Many similarities to :

  • Scentless Mayweed (Tripleurospermum inodorum)
  • Scented Mayweed (Matricaria chamomilla)
  • Corn Chamomile (Anthemis arvensis)
  • Austrian Chamomile (Anthemis austriaca)
  • Stinking Chamomile (Anthemis cotula)
  • Sicilian Chamomile (Anthemis punctata)
  • Chamomile (Chamaemelum nobile) which is fairly rare.
but many of the above are odorous or perfumy, or do not grow next the sea.

No relation to : May Apple (Podophyllum peltatum) [a poisonous plant with similar name that is not native to the UK].


  Tripleurospermum maritimum  ⇐ Global Aspect ⇒ Asteraceae  

Distribution
 family8Daisy & Dandelion family8Asteraceae

 BSBI maps
genus8Tripleurospermum
Tripleurospermum
(Mayweeds)

SEA MAYWEED

Tripleurospermum maritimum

Daisy & Dandelion Family [Asteraceae]