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Family: Asteraceae
  Genus: Cirsium

    Cirsium altissimum (L.) Spreng.*+

        tall thistle, wood thistle
             Carduus altissimus L.
             Cirsium altissimum (L.) Spreng. var. biltmoreanum Petr.
             Cirsium iowense (Pammel) Fernald
             Cirsium X iowense (Pammel) Fernald (pro sp.) X
             Cnicus iowensis Pammel
    Cirsium altissimum (L.) Spreng. X C. discolor (Muhl. ex Willd.) Spreng.+

        
             Cirsium discolor (Muhl. ex Willd.) Spreng. X C. altissimum (L.) Spreng.
    Cirsium arvense (L.) Scop.*+

        Canada thistle, creeping thistle, field thistle
             Carduus arvensis (L.) Robson
             Cirsium arvense (L.) Scop. f. albiflorum (E.L.Rand & Redfield) Ralph Hoffm.
             Cirsium arvense (L.) Scop. var. argenteum (Vest) Fiori
             Cirsium arvense (L.) Scop. var. horridum Wimm. & Grab.
             Cirsium arvense (L.) Scop. var. integrifolium Wimm. & Grab.
             Cirsium arvense (L.) Scop. var. mite Wimm. & Grab.
             Cirsium arvense (L.) Scop. var. vestitum Wimm. & Grab.
             Cirsium incanum (Gmel.) Fisch.
             Cirsium setosum (Willd.) Besser ex M.Bieb.
             Cnicus arvensis (L.) Roth
             Cnicus arvensis (L.) Roth f. albiflorum E.L.Rand & Redfield
             Serratula arvensis L.
    Cirsium canescens Nutt.*
        Platte thistle, prairie thistle
             Carduus undulatus Nutt. var. canescens (Nutt.) Porter
             Cirsium nebraskense (Britton) Lunell
             Cirsium nelsonii (Pammel) Petr.
             Cirsium plattense (Rydb.) Cockerell ex Daniels
    Cirsium discolor (Muhl. ex Willd.) Spreng.*+

        field thistle, pasture thistle, prairie thistle
             Carduus discolor (Muhl. ex Willd.) Nutt.
             Cirsium discolor (Muhl. ex Willd.) Spreng. f. albiflorum (Britton) House
    Cirsium discolor (Muhl. ex Willd.) Spreng. X C. muticum Michx.+

        
             Cirsium muticum Michx. X C. discolor (Muhl. ex Willd.) Spreng.
    Cirsium flodmanii (Rydb.) Arthur*+

        Flodman's thistle, prairie thistle
             Carduus oblanceolatus Rydb.
             Cirsium nebraskense (Britton) Lunell var. discissum Lunell
             Cirsium oblanceolatum (Rydb.) K.Schum.
    Cirsium hillii (Canby) Fernald*+

        Hill's thistle, hollow-rooted thistle, prairie thistle
             Cirsium pumilum (Nutt.) Spreng. subsp. hillii
             Cirsium pumilum (Nutt.) Spreng. var. hillii (Canby) B.Boivin
             Cnicus hillii Canby
    Cirsium muticum Michx.*+

        swamp thistle
             Carduus muticus (Michx.) Pers.
             Cirsium bigelovii DC.
             Cirsium muticum Michx. f. lactiflorum Fernald
             Cirsium muticum Michx. var. monticola Fernald
             Cirsium muticum Michx. var. subpinnatifidum (Britton) Fernald
    Cirsium ochrocentrum A.Gray
        yellow-spine thistle
             Cnicus ochrocentrus (A.Gray) A.Gray
    Cirsium palustre (L.) Scop.*+

        European swamp thistle, marsh thistle
             Cnicus palustris (L.) Willd.
    Cirsium pitcheri (Torr. ex Eaton) Torr. & A.Gray*+

        dune thistle, sand dune thistle
             Cnicus pitcheri Torr. ex Eaton
    Cirsium undulatum (Nutt.) Spreng.*+

        wavy-leaved thistle
             Carduus helleri Small
             Carduus megacephalus (A.Gray) Nutt.
             Carduus undulatus Nutt.
             Cirsium helleri (Small) Cory
             Cirsium megacephalum (A.Gray) Cockerell
             Cirsium ochrocentrum A.Gray var. helleri (Small) Petr.
             Cirsium undulatum (Nutt.) Spreng. var. megacephalum (A.Gray) Fernald
             Cirsium undulatum (Nutt.) Spreng. var. undulatum
             Cnicus undulatus (Nutt.) A.Gray
             Cnicus undulatus (Nutt.) A.Gray var. megacephalus A.Gray
    Cirsium vulgare (Savi) Ten.*+

        bull thistle
             Carduus lanceolatus L.
             Carduus vulgaris Savi
             Cirsium lanceolatum (L.) Scop., non Hill
             Cirsium lanceolatum (L.) Scop. var. hypoleucum DC.

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