[Members of the Sunflower Family Found West of the Cascade Mountains With Flower Heads Consisting Entirely of Ray Flowers]

Sow Thistles West of the Cascade Mountains of Oregon and Washington

The Genus Sonchus

Prickly Sow Thistle, Prickly Sow-thistle, Spiny Sow-thistle, Spiny-leaf Sow-thistle: Sonchus asper

Prickly Sow Thistle: Sonchus asper

Corn Sow Thistle, Field Sowthistle, Field Sow Thistle, Field Sow-thistle, Perennial Sow Thistle: Sonchus arvensis var. arvensis (Synonym: Sonchus arvensis var. shumovichii) -

Prickly Sow Thistle, Prickly Sow-thistle, Spiny Sowthistle, Spiny Sow-thistle, Spiny-leaf Sow-thistle: Sonchus asper (Synonyms: Sonchus asper ssp. asper, Sonchus asper ssp. glaucescens, Sonchus nymanii, Sonchus oleraceus var. asper) -

Annual Sow Thistle, Common Sowthistle, Common Sow Thistle, Common Sow-thistle: Sonchus oleraceus -


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