Robert W. Freckmann Herbarium


  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
(Glossary)

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

Flora of North America (off site)
Synonyms 
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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