SMOOTH SOW-THISTLE
COMMON SOW-THISTLE
Sonchus oleraceus
Daisy & Dandelion [Asteraceae] 
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Daisy & Dandelion [Asteraceae]
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flower
inner
morph
petals
stem
stem
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| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Grows up to 1.5m tall. Stout and hairless stems; leaves also hairless unless young. |
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| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Leaves have a satin sheen and are not glossy, un-like Perennial Sow-thistle (Corn Sow-thistle). Leaves are pinnatifid have broad lobes, triangular in overall shape at the termination. |
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| 21st Sept 2010, East Lancs Rd, Walkden, Gtr M/cr. | Photo: © RWD |
| The triangular shaped leaves have a stepped or ladder appearance. |
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| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Leaves are toothed but without spines. |
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| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Flowers are a paler yellow than those of Rough sow-Thistle, and typically have an even paler halo. Leaves are a grey-green and clasp the stem with two auricles either side of the stem. |
_2010_09_05_Wigan_Parbold_BurscoughBridge_019p09.jpg)
| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Any hairs are not sticky (un-like those of Perennial Sow-thistle). When in seed, the flower heads bulge at the bottom to accommodate the seeds. |
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| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Flowers Dandelion-type and up to an inch across. Text goes here |
_2010_09_05_Wigan_Parbold_BurscoughBridge_045p99.jpg)
| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Florets pale yellow; paler towards the periphery. |
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| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
Like some Hawkweeds, the obverse side of the outer florets sometimes have a pale purple stripe. |
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| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Stem leaves clasp the stem with two auricles either side. |
_2010_09_05_Wigan_Parbold_BurscoughBridge_027p5.jpg)
| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Small leaves just at the node of the (branched) flower stalks. |
_2010_09_05_Wigan_Parbold_BurscoughBridge_022p7.jpg)
| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Basal leaves are broad and deeply cut with triangular lobes, ending in a terminating triangle. Leaves are toothed but without spines. |
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| 5th Sept 2010, Leeds & L/pool canal, Appley Bridge. | Photo: © RWD |
| Text goes here |
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Hybridises with : Prickly Sow-Thistle (Sonchus asper) to produce Sonchus asper × glaucescens.
Some similarities to : Prickly Sow-Thistle, Superficial resemblance to : Perennial Sow-thistle The sap, contained in numerous channels, is milky.
It is also and confusingly called 'Milk Thistle', but true Milk Thistle (Silybum marianum) is a thistle with marbled leaves and a purple thistle-like flower head. ANY TEXT GOES HERE |
 Sonchus (Sow-Thistles) |
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Daisy & Dandelion [Asteraceae]
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