Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  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

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

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

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