*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

Synonymy: = C, NE, SE1, Va, WV; = Sonchus arvensis L. ssp. uliginosus (M.Bieberstein) Nyman – FNA19, GrPl, K1, K3, K4, NY, Pa, Tn; = Sonchus uliginosus M.Bieberstein – G, Il, Oh3; < Sonchus arvensis L. – Mi, RAB, W; > Sonchus arvensis L. var. glabrescens (Günther) Grab. & Wimm. – F; > Sonchus uliginosus M.Bieberstein – F

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