Robert W. Freckmann Herbarium


  Sonchus arvensis L. image
Photographer: Robert W. Freckmann           

Botanical Illustration

Botanical Illustration

Botanical Illustration

Botanical Illustration

Botanical Illustration

Keir Morse

Kurt Stüber

Christopher Noll
Family Asteraceae
Sonchus arvensis L.
field sow-thistle, perennial sow-thistle
Sonchus: the Greek name for sowthistle
arvensis: of planted fields
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - naturalized
Plant: erect, perennial, 16"-60" tall forb with milky juice; stems hairless below the inflorescence; deep, creeping roots forming large patches
Flower: head 1 1/4"-2" wide with yellow ray flowers; inflorescence of several heads in open, branched clusters; blooms July-Oct.
Fruit:wrinkled, dry seed with 5 obvious ribs on each side
Leaf:alternate, edges prickly, lower leaves mostly pinnately-divided, upper leaves upper smaller, less divided and with heart-shaped bases clasping part way around the stem
Habitat: disturbed sites
(Glossary)

More Information Natural Communities Herbarium Specimens
All Sonchus list Google- Images or Text

Flora of North America (off site)
Synonyms 
(for list of synonyms - see the varieties)

         
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