Ragwort

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Jacobaea maritima SILVER RAGWORT  not Jacobaea cineraria

Jacobaea erucifolia HOARY RAGWORT
Jacobaea inaequidens NARROW-LEAVED RAGWORT
Jacobaea vulgaris RAGWORT not Jacobaea jacobaea (syn.Senecio jacobaea)
Jacobaea squalidus OXFORD RAGWORT (previously Senecio squalidus)
Senecio viscosus STICKY GROUNDSEL
Senecio vulgaris COMMON GROUNDSEL
Senecio vulgaris forma. radiatus RAYED GROUNDSEL
Senecio x baxteri HYBRID RAGWORT
 

Jacobaea is a genus of the tribe Senecioneae and the family Asteraceae. Its members used to be placed in the genus Senecio, but have been separated into the segregate genus Jacobaea on the basis of molecular phylogenetics in order to maintain genera that are monophyletic

 

Senecio cineraria SILVER RAGWORT  syn: Senecio bicolor, Jacobaea maritima,

Senecio erucifolius HOARY RAGWORT
Senecio inaequidens NARROW-LEAVED RAGWORT
Senecio jacobaea RAGWORT
Senecio squalidus OXFORD RAGWORT
 

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29 June 2022

Cinnabar Moth
Tyria jacobaeae
at Downs Link near the Cement Works

Common Ragwort was beginning to flower and was quite extensive on the New Erringham pastures to the east of Mill Hill. The caterpillars of this moth feed on Ragwort, but it is not clear if it is all species and I have only seen it on Common Ragwort,
 

29 March 2022 Groundsel on disturbed wasteland juxta Waller's Pumphouse, Shoreham Airport NE. A very small ground hugging single plant. More information Oxford Ragwort was seen near Eastern Avenue railway level crossing, Shoreham-by-Sea. The ragwort is a much larger plant.

22/23 October 2019

Hoary, Common, Oxford
Silver
Ragworts on Shoreham Beach

 
 
 
 
 
 

6 June 2019 A Silver Ragwort hosted a colony of Black Ants which were probably attracted by Ragwort Aphids, Aphis jacobaeae. The aphids are usually attended by ants which may build earth tents over them.    Ragwort Aphids

22 April 2019

A small bee on Oxford Ragwort, Widewater flood plain

17 July 2018

Hoary Ragwort
Common Ragwort
Mill Hill

7 June 2018

Silver Ragwort

October 2017
 
 

Common Ragwort	Oxford Ragwort	Hoary Ragwort

 

19 September 2017
 

Oxford Ragwort or Rayed Groundsel
Shoreham Beach (west of the Old Fort)

18 September 2017

Common Ragwort
except top right which is Hoary Ragwort with paler yellow flowers and the phyllary bracts are not black tipped

26 June 2017

Silver Ragwort
Shoreham Beach

      Common Ragwort was beginning to flower on Shoreham and Lancing beach.
 

4 June 2017

Silver Ragwort
Shoreham Beach

29 April 2017
Oxford Ragwort, Senecio squalidus, was very common, especially near the railway tracks in Shoreham.

25 April 2017

Oxford Ragwort
It was also seen flowering on the beach. by Widewater.

11 April 2017

Oxford Ragwort

25 October 2016

Oxford Ragwort, Senecio squalidus, is a alien hybrid ragwort first introduced to into the UK around 1690 via the Oxford Botanic Gardens. It escaped into the wild and spread rapidly along railway tracks from the late 19th century. In Shoreham it favours the gravel ballast of the railway track (near Eastern Avenue Railway Level Crossing) and areas of shingle on Shoreham Beach. Its flowers are a richer yellow than the native Common Ragwort and Hoary Ragwort. It is a more attractive plant with a longer flowering season.  It can be seen in flower from April until November. The small and weedy Groundsel was still flowering in Old Shoreham.
 

23 September 2016

Ragworts on Mill Hill
Common Ragwort   &  Hoary Ragwort

22 September 2016

 

 

Common Ragwort   Phyllary bracts are black tipped.

Hoary Ragwort at Old Shoreham.  Phyllary bracts are not black tipped. Flowers are paler yellow than those of Common Ragwort.

 
 
 
 
 
 

For Hoary Ragwort, the outer phyllaries under the flowerhead should be about half as long as the inner, which have green rather than dark tips. That all seems to be the case here. The late flowering is persuasive as well, though not conclusive. The leaves would clinch it further, but I'd be happy with Hoary.
ID confirmation by Scott on Flora of the British Isles

 

 

21 September 2016

 

 

Shoreham Beach

Silver Ragwort, Sticky Groundsel x 2

Silver Ragwort x 2, Common Ragwort

 

15 September 2016

 

Oxford Ragwort

Between the cracks in the tarmac on a road verge nearby, I recorded the Oxford Ragwort, Senecio squalidus, for the first time; a more showy immigrant plant than the native Common Ragwort.

 

Common Groundsel Senecio vulgaris

25 April 2016

Oxford Ragwort on Shoreham Beach
Senecio squalidus

 

This immigrant Oxford Ragwort was not identified until September 2016. Common Ragwort does not flower in April. June is usually the earliest.

 

9 June 2014 On Mill Hill, south of the Reservoir I spotted my first two Cinnabar Moths of the year. They were easily disturbed and flew through the long grasses and stems of Greater Knapweed quite quickly, and too elusive for a tired photographer as I was about to leave Mill Hill.

 

9 July 2009 By the Reservoir on Mill Hill the first Cinnabar Moth caterpillars of the year were seen on a small clump of Ragwort.

17 December 2006

 

Hoary Ragwort in flower on the Downs/Coastal Link Cyclepath. Same plant as shown immediately below.	Hoary Ragwort in flower on the Downs/Coastal Link Cyclepath. Same plant as shown immediately below.	A dimunitive 12 cm Ragwort on the Old Erringham pasture.

 

 

13 December 2006

 

Hoary Ragwort was in flower on the Coastal Link Cyclepath south of the Toll Bridge, Old Shoreham.

Only the phyllary bracts are black tipped in the Common Ragwort and some Groundsels.

The other green leaved species is the alien known as the Oxford Ragwort, Senecio squalidus. All bracts are black-tipped in this species.
Ragwort Facts
 

29 June 2015

Four types of Ragwort will be found in the UK, all of them poisonous to livestock :-

The Common Ragwort - Senecio jacobaea, the most widespread type.
The Marsh Ragwort - Senecio aquaticus, in wet meadows, ditches, marshland and moorland.
The Oxford Ragwort - Senecio squalidus.
The Hoary Ragwort - Senecio erucifolius.