Sonchus arvensis Linnaeus var. glabrescens (Günther) Grabowski & Wimmer. Perennial Sow-thistle. Phen: Jun-Nov. Hab: Disturbed areas. Dist: Native of Europe.
Origin/Endemic status: Europe
Syn: = C, NE, SE1, Va, WV; = Sonchus arvensis ssp. uliginosus – FNA19, GrPl, K1, K3, K4, Pa, Tn; = Sonchus uliginosus – G, Il, Oh3; < Sonchus arvensis – Mi, RAB, W; > Sonchus arvensis var. glabrescens – F; > Sonchus uliginosus – F
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