Sonchus asper (L.) Hill  
Family: Asteraceae
prickly sow-thistle, spiny sow-thistle, spiny-leaf sow-thistle
[Sonchus asper f. glandulosus (L.) Hill, Sonchus asper f. inermis (L.) Hill, Sonchus asper var. inermis (L.) Hill, Sonchus asper var. inermis f. gracilis (L.) Hill, Sonchus asper var. pungens (L.) Hill]
Sonchus asper image
Paul Drobot  
Etymology: Sonchus: the Greek name for sowthistle
Plants: erect, annual, 4"-80" tall, mostly hairless forb with milky juice
Leaves: 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
Flowers: head 1/2"-1" wide with pale yellow ray flowers; inflorescence of several heads in open, branched clusters; blooms July-Oct.
Fruits: dry, unwrinkled seed faintly 3-5 ribbed on each side
Habitat: disturbed sites
Sonchus asper image
Paul Drobot  
Sonchus asper image
Paul Drobot  
Sonchus asper image
Emmet J. Judziewicz  
Sonchus asper image
Botanical Illustration  
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