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Family: Asteraceae
  Genus: Sonchus

    Sonchus arvensis L.*+

        field sow-thistle, perennial sow-thistle
    Sonchus arvensis L. var. arvensis +

        field sow-thistle, perennial sow-thistle
             Sonchus arvensis L. subsp. arvensis
             Sonchus arvensis L. var. shumovichii B.Boivin
             Sonchus arvensis L. var. typicus Beck
    Sonchus arvensis L. var. glabrescens GŁnther, Grab. & Wimm.*+

        marsh sow-thistle
             Sonchus arvensis L. subsp. uliginosus
             Sonchus uliginosus M.Bieb.
    Sonchus asper (L.) Hill*+

        prickly sow-thistle, spiny sow-thistle
             Sonchus asper (L.) Hill f. glandulosus Beckh.
             Sonchus asper (L.) Hill f. inermis (Bisch.) Beck
             Sonchus asper (L.) Hill var. inermis Bisch.
             Sonchus asper (L.) Hill f. gracilis A.F.Schwarz var. inermis Bisch.
             Sonchus asper (L.) Hill var. pungens Bisch.
    Sonchus oleraceus L.*+

        common sow-thistle, field sow-thistle
  Genus: Lactuca

    Lactuca biennis (Moench) Fernald*+
        tall blue lettuce, woodland lettuce
             Lactuca biennis (Moench) Fernald f. aurea (Jenn.) Fernald
             Lactuca biennis (Moench) Fernald f. integrifolia (Torr. & A.Gray) Fernald
             Lactuca spicata auct. non (Lam.) Hitchc.
             Lactuca spicata (Lam.) Hitchc. var. integrifolia (Torr. & A.Gray) Britton
             Mulgedium spicatum auct. non (Lam.) Small
             Mulgedium spicatum (Lam.) Small var. integrifolium (Torr. & A.Gray) Small
             Sonchus biennis Moench
    Lactuca ludoviciana (Nutt.) Riddell+
        prairie lettuce, prairie wild lettuce, western wild lettuce
             Lactuca campestris Greene
             Lactuca campestris Greene var. typica Wiegand
             Sonchus ludovicianus Nutt.
    Lactuca pulchella (Pursh) DC.*+
        showy blue lettuce
             Lactuca oblongifolia Nutt.
             Lactuca tatarica (L.) C.A.Mey. subsp. pulchella
             Lactuca tatarica (L.) C.A.Mey. var. heterophylla (Nutt.) B.Boivin
             Lactuca tatarica (L.) C.A.Mey. var. pulchella (Pursh) Breitung
             Mulgedium heterophyllum Nutt.
             Sonchus pulchellus Pursh
             Sonchus tataricus L., pro parte

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