PRICKLY SOW-THISTLE

ROUGH SOW-THISTLE

Sonchus asper

Daisy & Dandelion Family [Asteraceae]

Flowers:
month8apr month8april month8may month8jun month8june month8jul month8july month8aug month8sep month8sept month8oct month8nov

Pappus: pappusZpossible (white)
pappus8sep pappus8sept pappus8oct pappus8nov pappus8dec

status
statusZnative
 
flower
flower8yellow
 
morph
morph8actino
 
petals
petalsZMany
 
stem
stem8round
 
stem
stem8hollow
 
stem
stem8milkysap stem8milkylatex
 

24th May 2011, Worsley, Gtr Mcr. Photo: © RWD
Stout plant growing up to 1.5 metres it has narrow spiny glossy leaves and yellow Dandelion-type flowers.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Leaves narrower than those of Smooth Sow-Thistle, nor as deeply cut.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Leaves clasp the stem in a bending-over-backwards kind of fashion (un-like the almost right-angled clasp of Smooth Sow-Thistle.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Flowers a deeper shade of yellow than the much paler Smooth Sow-Thistle.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Flowers golden yellow, about an inch across.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Base of closed sepals bulges out into a vase shape when the seeds and pappus are developing.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Flower buds cylindrical when flower not yet opened (centre) and bulbous at the base when about to open in seed with parachutes.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Florets do not fade towards the periphery of the flower-head.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Leaves clasping the stem with rounded auricles adpressed against the stem.


24th May 2011, Worsley, Gtr Mcr. Photo: © RWD
Very stout angular stem, with reddish streaks. Leaves with rounded auricles that are clasping the stem un-like Smooth Sow-Thistle.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Leaves not as deeply cut nor as broad as those of Smooth Sow-Thistle.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Instead, the leaves are not only doubly-toothed, but also crisped or wavy and spiny on the edges like they are in many thistles.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Dandelion-type pappus with smooth-sided achenes.


5th Sept 2010, Leeds & L/pool canal, Appley Bridge. Photo: © RWD
Smooth-sided achenes.


Easily confused with : sub-species Sonchus asper subsp. glaucescens (but that only grows in two separated hectads on the Mid-Wales coast)

Hybridizes with : Smooth Sow-Thistle (Sonchus oleraceus) to produce Sonchus asper × glaucescens.

Easily confused with: Smooth Sow-Thistle, but that has pointed auricles whereas Prickly Sow-thistle sas rounded auricles which clasp the stem.

Some similarities to : Prickly Lettuce and Great Lettuce

Some resemblance to : Perennial Sow-thistle

Like many Sow-Thistles, this too has a milky sap.

The name Sonchus is derived from the Greek for 'hollow', the Sow-thistles have hollow stems.


  Sonchus asper  ⇐ Global Aspect ⇒ Asteraceae  

Distribution
 family8Daisy & Dandelion family8Asteraceae

 BSBI maps
genus8Sonchus
Sonchus
(Sow-Thistles)

PRICKLY SOW-THISTLE

ROUGH SOW-THISTLE

Sonchus asper

Daisy & Dandelion Family [Asteraceae]

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