Sonchus arvensis L.
(Perennial Milk-thistle, Perennial Sow-thistle)

Taxonomic hierarchy:
SpeciesSonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle)
GenusSonchus (sow thistles)
TribeLactuceae (“dandelions”)
SubfamilyLACTUCOIDEAE (“dandelions”)
FamilyASTERACEAE (daisies, dandelions and thistles, composite)
OrderASTERALES (daisies, dandelions, thistles and bell flowers)
SubclassEU-DICOTS (dicotyledonous flowering plants)
ClassMAGNOLIOPSIDA (flowering plants)
PhylumTRACHEOPHYTA (vascular plants)
KingdomPLANTAE (plants)
DomainEukaryota (eukaryotes)
LifeBIOTA (living things)
Records of Sonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle) :
1: Sonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle)
21 Jul 2002 OSGR: ST25 51° 20’ N, 3° 0’ W Vice County: North Somerset (VC 6) England
Image 1: Basal leavesImage 2: Capitulum - close-upImage 3: Flower headsImage 4: Plants growing on sand dunes
2: Sonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle)
5 Aug 2001 OSGR: SU67 51° 30’ N, 1° 10’ W Vice County: Berks (VC 22) England
Image 1: Buds and capitula - side viewImage 2: Buds and capitulumImage 3: Buds - close-upImage 4: Buds - close-up (2)Image 5: Capitula and buds - side viewImage 6: Capitula - top viewImage 7: Capitulum - side viewImage 8: Leaf basesImage 9: Leaf base - side viewImage 10: Leaf rosettesImage 11: LeavesImage 12: Leaves (2)Image 13: PlantsImage 14: Plants (2)
3: Sonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle)
5 Aug 2001 OSGR: SU67 51° 30’ N, 1° 10’ W Vice County: Berks (VC 22) England
On brick retaining wall
Image 1: Basal leavesImage 2: Plant
4: Sonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle)
7 Sep 1970 OSGR: TQ20 50° 50’ N, 0° 10’ W Vice County: East Sussex (VC 14) England
Image 1: Capitula - side view - close-upImage 2: Capitulum - side view - close-up
5: Sonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle)
9 Aug 1970 OSGR: TQ50 50° 50’ N, 0° 10’ E Vice County: East Sussex (VC 14) England
Image 1: Plant

Sonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle) may be included in identification literature listed under the following higher taxa:

NBNNBN (data.nbn.org.uk) has a distribution map for Sonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle)
BioInfoBioInfo (www.bioinfo.org.uk) has 19 host/parasite/foodplant and/or other relationships for Sonchus arvensis (Perennial Milk-thistle, Perennial Sow-thistle)
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