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Pictures of Sonchus asper (prickly sow thistle) and Sonchus oleraceus (common sow thistle). Sonchus asper (A). plant; (C). achene; (E,G). rounded leaf base auricle and prickly leaf margin. Sonchus oleraceus (B). plant; (D). achene; (F,H). pointed leaf base auricle and lobed leaf margin. Photo credits: (C,D) (Jose Mejías); (A,B,E–H) (Jin Hyeong Kim and Myong-Suk Cho).
