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

Field Sow-thistle, Marsh Sow-thistle, Wet Ground Sow-thistle: Sonchus arvensis ssp. uliginosus (Synonyms: Sonchus arvensis var. glabrescens, Sonchus uliginosus) -

Prickly Sow Thistle, Prickly Sow-thistle, Spiny Sowthistle, Spiny-leaf Sow-thistle, Spiny 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 -


Paul Slichter E-mail