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 asper (L.) Hill image
Photographer: Paul Drobot           

Botanical Illustration

Botanical Illustration

Botanical Illustration

Emmet J. Judziewicz

Paul Drobot

Paul Drobot
Family Asteraceae
Sonchus asper (L.) Hill
prickly sow-thistle, spiny sow-thistle
Sonchus: the Greek name for sowthistle
asper: rough
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - naturalized
Plant: erect, annual, 4"-80" tall, mostly hairless forb with milky juice
Flower: head 1/2"-1" wide with pale yellow ray flowers; inflorescence of several heads in open, branched clusters; blooms July-Oct.
Fruit:dry, unwrinkled seed faintly 3-5 ribbed on each side
Leaf:alternate, often not lobed, heart-shaped bases clasping and curving around the stem, toothed to pinnately-divided, edges quite prickly, upper leaves smaller and less divided
Habitat: disturbed sites
Notes: similar to S. oleraceus but more prickly and with an unwrinked seed

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

Flora of North America (off site)
Sonchus asper (L.) Hill f. glandulosus Beckh.
Sonchus asper (L.) Hill f. inermis (Bisch.) Beck
Sonchus asper (L.) Hill var. inermis Bisch.
Sonchus asper (L.) Hill var. inermis Bisch. f. gracilis A.F.Schwarz
Sonchus asper (L.) Hill var. pungens Bisch.

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