STICKY GROUNDSEL

STINKING GROUNDSEL

Senecio viscosus

Daisy & Dandelion Family [Asteraceae]  

Flowers:
month8jul month8july month8aug month8sep month8sept

Pappus: pappusZpossible (white, simple)
pappus8sep pappus8sept pappus8oct

**
status
statusZneophyte
 
flower
flower8yellow
 
morph
morph8actino
 
petals
petalsZMany
 
stem
stem8round
 
stem
stem8ribbed
in places
smell
smell8foetid
foetid
toxicity
toxicityZlowish
 
sex
sexZbisexual
 

1st Aug 2008, Walkden High Level Stn, Mcr. Photo: © RWD
A rather straggly plant growing in waste places and cracks in under-used pavements.


2nd Aug 2017, Ash Grove, Walkden, Gtr M/cr. Photo: © RWD
The leaves lower down look like those of a Ragwort, which is not surprising really as they all come under the Senecio genus.


2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
A top-down approach. After opening the petals soon curve underneath the flower.
[The teensy-weensy whorls of white flowers of Gipsywort make an appearance at waters-edge, top of the photo]


2nd Aug 2017, Ash Grove, Walkden, Gtr M/cr. Photo: © RWD


2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
The stems are hoary with short white hairs.


22nd Sept 2012, Wigan Athletic FC, Leeds & L/pool canal, Lancs. Photo: © RWD
Flowers singly at the top of somewhat wavy and branched stems. Flowers about to set seed start to bulge visibly at the bottom to accommodate the seeds (top right).


2nd Aug 2017, Ash Grove, Walkden, Gtr M/cr. Photo: © RWD


2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
Covered in shortish clammy sticky-glandular hairs. Few ray petals and not usually extending far for long before curling over.


2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
The books say that Sticky Groundsell lacks the black-tipped bracts of many other Groundsels, but clearly not all. This has sticky glandular hairs, as per spec. The flower heads are 10 to 12mm across when the petals are sticking out, but quickly curl-over downwards.

[The fewer-petalled hybrid between Oxford Ragwort and Groundsel called Welsh Groundsel also has petals which soon curl-over].



2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
The numerous sticky glandular hairs (of various lengths on this specimen).

According to Clive Stace, the way to differentiate Sticky Groundsel (which is very sticky) from the very similar Heath Groundsel (Senecio sylvaticus) (which can be not sticky or only slightly sticky) is by way of the length of the supplementary phyllaries: on Sticky Groundsel the supplementary phyllaries at the base of the capitulum are between 1/2 to 1/3rd as long as the phyllaries which reach to the top, (whereas for Heath Groundsel they are between 1/3rd to 1/4 as long as the phyllaries).

So, according to that criteria, these photos are indeed of Sticky Groundsel. [Another book says that Heath Groundsel has yellow-green leaves whereas those of Sticky Groundsel are dark-green! Hmmph!!! Stace makes no mention of colour of leaves in any differentiation.]



12th June 2009, Jubilee Hut, Greenside Mines. Photo: © RWD
Flower yellow with many inner disc florets and only few ray florets which soon curl-underneath.


2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
The ray florets about to curl under.


22nd Sept 2012, Wigan Athletic FC, Leeds & L/pool canal, Lancs. Photo: © RWD
Only the very tips of the narrow bracts are dark-tipped. Bracts of one length only, un-like Groundsel.


22nd Sept 2012, Wigan Athletic FC, Leeds & L/pool canal, Lancs. Photo: © RWD
Hairs tipped with small sticky spheres.


12th June 2009, Jubilee Hut, Greenside Mines. Photo: © RWD
Seed clocks robust with long brown/blackish seed pods. Parachutes not spherical, but conical.


12th June 2009, Jubilee Hut, Greenside Mines. Photo: © RWD
A miniature and dimpled white spherical 'golf-ball' remains when the seeds have flown the nest.


22nd Sept 2012, Wigan Athletic FC, Leeds & L/pool canal, Lancs. Photo: © RWD
After rain the hairs of the parachute may congregate together by capillary action. Note the bracts have now opened up to allow the seeds to escape, but they wont be flying tonight whilst moist!


2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
The leaves are very similar to those of Groundsel, but they have one or two more side-branches off the main axis. The glandular-tipped hairs are sticky. The main stem has many narrow ridges running its' length.


22nd Sept 2012, Wigan Athletic FC, Leeds & L/pool canal, Lancs. Photo: © RWD
Leaves are greyish green with short whitish hairs, and angularly lobed.


2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
The top-side of that same leaf - it has many more short, sticky, glandular hairs than underneath.


2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
The underside of a leaf.


2nd Sept 2014, Ashton Canal, Manchester. Photo: © RWD
The top of the leaf seems to have more glandular hairs than the underside.


22nd Sept 2012, Wigan Athletic FC, Leeds & L/pool canal, Lancs. Photo: © RWD
A plant fully in fruit looks most untidy.


2nd Aug 2017, Ash Grove, Walkden, Gtr M/cr. Photo: © RWD
The junction of branch with main stem looks like it has been stuck on with purple glue!


2nd Aug 2017, Ash Grove, Walkden, Gtr M/cr. Photo: © RWD
Stems grooved / ribbed and with glandular hairs.


Easily confused with : other Groundsels, such as Hoary Groundsel (Senecio erucifolius).

Not to be confused with : Sticky Mouse-Ear (Cerastium glomeratum), Sticky Stork's-bill (Erodium aethiopicum), Sticky Phacelia (Phacelia viscida), Sticky Clary (Salvia glutinosa), Sticky Catchfly (Silene viscaria), [plants with similar names from differing families]

Hybridizes with :

  • Heath Groundsel (Senecio sylvaticus) to produce Senecio × viscidulus;
  • Oxford Ragwort (Senecio squalidus) to produce Senecio × baxteri.
It is not known whether any of the above photographs represents a hybrid.

Grows on waste ground and other bare places, often between stones or gaps in outdoor paving. A weed of disturbed grounds and gardens. The plant is both viscous sticky and foetid smelling.


  Senecio viscosus  ⇐ Global Aspect ⇒ Asteraceae  

Distribution
 family8Compositae family8Daisy family8Dandelion family8Asteraceae
 BSBI maps
genus8Senecio
Senecio
(Ragworts)

STICKY GROUNDSEL

STINKING GROUNDSEL

Senecio viscosus

Daisy & Dandelion Family [Asteraceae]  

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