MARSH RAGWORT

Senecio aquaticus

Daisy & Dandelion Family [Asteraceae]

Flowers:
month8jun month8june month8jul month8july month8aug month8sep month8sept month8oct

Pappus: pappusZpossible (white, simple)
pappus8aug pappus8sep pappus8sept pappus8oct pappus8nov

status
statusZnative
flower
flower8yellow
morph
morph8actino
petals
petalsZMany
stem
stem8round
stem
stem8ribbed
toxicity
toxicityZmedium

5th July 2017, Entwistle Resr, Chorley, Lancs. Photo: © RWD
At 80cm it is shorter than Common Ragwort and with branches more widely spreading.


5th July 2017, Entwistle Resr, Chorley, Lancs. Photo: © RWD
Grows it wettish places, here on the edge of a water-supply reservoir. Lower leaves have one large terminating lobe.


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD


17th July 2015, marshland, Side Fm, Patterdale, Cumbria. Photo: © RWD
Grows in marshland and other wettish places, here with Marsh Bedstraw.


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD
With flowers more widely separated.


17th July 2015, marshland, Side Fm, Patterdale, Cumbria. Photo: © RWD
At 20 - 25m across (up to 45mm across in Scotland) the flowers are often slightly larger than those of the 15 - 25mm across of Common Ragwort.


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD
No other text mentions that the stalks often have matted white hairs appressed to them, but many other photos of Marsh Ragwort on the internet do have them but this is NOT Hoary Ragwort (Senecio erucifolis) nor the silvery Silver Ragwort (Senecio cineraria).


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD
Usually with just over 12 petals or so ray-florets.


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD
Each ray-floret has two nicks at the tip, therefore there are three flowers per ray.


5th July 2017, Entwistle Resr, Chorley, Lancs. Photo: © RWD
Centre: unopened flower bud. Lower left a recently opened one with florets still green within. Far left and off the screen, opened flower, disc florets still closed, ray florets yet to grow more and splay out.


5th July 2017, Entwistle Resr, Chorley, Lancs. Photo: © RWD
Outer disc florets opened.


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD
The inner bracts surrounding the lower part of the flower are pointed, the outer bracts much shorter.


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD
Flower stems half covered in cob-weby white hairs.


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD
Bracts pale green and with whitish edges.


17th July 2015, marshland, Side Fm, Patterdale, Cumbria. Photo: © RWD
Distinctive leaves, lower ones have wide end-lobe, with only a few and shorter side-lobes.


17th July 2015, marshland, Side Fm, Patterdale, Cumbria. Photo: © RWD
Some leaves are so deeply lobed that the casual observer may count them as separate leaves.


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD
Whilst other leaves display squegging or 'motorboating' as exhibited by blocking oscillators or other unstable electronic circuits.


16th July 2015, Lee Green Resr, Burnley way, Burnley, Lancs. Photo: © RWD
The end-lobe has fairly pronounced teeth.


17th July 2015, marshland, Side Fm, Patterdale, Cumbria. Photo: © RWD
The basal leaves are without lobes until a large oval end-lobe (which has fewer and shallower or even no teeth - un-like the end lobes of leaves of those a bit higher up the plant).


Easily confused with : many other Ragworts, but the wide end-lobes and the wettish location might give it away.

Not to be semantically confused with : Perennial Ragweed (Ambrosia psilostachya) or Ragweed (Ambrosia artemisiifolia) but these totally lack any ray florets [more members of the Dandelion & Daisy Family (Asteraceae)]. Nor with Ragged-Robin (Silene flos-cuculi) [a member of the Campion family (Caryophyllacaea)].

A yellow dye can be obtained from this plant.

Along with Common Ragwort (Senecio jacobaea) and Oxford Ragwort (Senecio squalidus) , Marsh Ragwort is ubiquitous throughout much of the UK, but more prevalent in the west where it is wetter. It grows in marshes or other wettish grassland areas such as besides streams and in damp meadows. The leaves of Marsh Ragwort are quite distinctive with fewer side-lobes and a wider end-lobe. Un-like Oxford Ragwort, which grows only in lowlands, Marsh Ragwort can grow at heights up to 460m, but is beaten by the 710m of Common Ragwort. A further identifying feature, but one not so easily seen without dismantling a flower-head, is the short plume of hairs on the seeds of both ray and disc florets of Marsh Ragwort.


  Senecio aquaticus  ⇐ Global Aspect ⇒ Asteraceae  

Distribution
 family8Daisy & Dandelion family8Asteraceae

 BSBI maps
genus8Senecio
Senecio
(Ragworts)

MARSH RAGWORT

Senecio aquaticus

Daisy & Dandelion Family [Asteraceae]