Integrated Taxonomic Information System - Search Results
Results of: Search in every Kingdom for Common Name containing 'cirsium'
 
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Results of: Search in every Kingdom for Scientific Name containing 'cirsium'
 
 Kingdom Plantae
  Cirsium Mill. – accepted – thistle
  Cirsium acanthodontum S.F. Blake – not accepted
  Cirsium acaule var. americanum A. Gray – not accepted
  Cirsium acaulescens (Rydb.) K. Schum. – not accepted
  Cirsium acuatum (Osterh.) Petr. – not accepted
  Cirsium altissimum (L.) Hill – accepted – tall thistle, roadside thistle
  Cirsium altissimum var. biltmoreanum Petr. – not accepted
  Cirsium altissimum var. filipendulum (Engelm.) A. Gray – not accepted
  Cirsium amblylepis Petr. – not accepted – Mt. Tamalpais thistle
  Cirsium americanum (A. Gray) K. Schum. – not accepted
  Cirsium andersonii (A. Gray) Petr. – accepted – rose thistle, Anderson's thistle
  Cirsium andrewsii (A. Gray) Jeps. – accepted – Franciscan thistle
  Cirsium araneans Rydb. – not accepted – jeweled thistle
  Cirsium arcuum A. Nelson – not accepted – powderpuff thistle
  Cirsium aridum Dorn – not accepted – desert thistle
  Cirsium arizonicum (A. Gray) Petr. – accepted – Arizona thistle
  Cirsium arizonicum var. arizonicum (A. Gray) Petr. – accepted – Arizona thistle
  Cirsium arizonicum var. bipinnatum (Eastw.) D.J. Keil – accepted – Cainville thistle
  Cirsium arizonicum var. chellyense (R.J. Moore & Frankton) D.J. Keil – accepted – Navajo thistle, queen thistle, monarch thistle
  Cirsium arizonicum var. nidulum (M.E. Jones) S.L. Welsh – not accepted – Arizona thistle
  Cirsium arizonicum var. rothrockii (A. Gray) D.J. Keil – accepted – Rothrock's thistle
  Cirsium arizonicum var. tenuisectum D.J. Keil – accepted – desert mountains thistle
  Cirsium arvense (L.) Scop. – accepted – Canada thistle, Canadian thistle, Californian thistle, creeping thistle, field thistle
  Cirsium arvense var. argenteum (Vest) Fiori – not accepted
  Cirsium arvense var. horridum Wimm. & Grab. – not accepted
  Cirsium arvense var. integrifolium Wimm. & Grab. – not accepted
  Cirsium arvense var. mite Wimm. & Grab. – not accepted
  Cirsium arvense var. vestitum Wimm. & Grab. – not accepted
  Cirsium barnebyi S.L. Welsh & Neese – accepted – Barneby's thistle
  Cirsium bigelovii DC. – not accepted
  Cirsium bipinnatum (Eastw.) Rydb. – not accepted
  Cirsium blumeri Petr. – not accepted
  Cirsium botrys Petr. – not accepted
  Cirsium brevifolium Nutt. – accepted – Palouse thistle
  Cirsium brevistylum Cronquist – accepted – clustered thistle
  Cirsium breweri (A. Gray) Jeps. – not accepted
  Cirsium breweri var. lanosissimum Petr. – not accepted
  Cirsium breweri var. wrangelii Petr. – not accepted
  Cirsium butleri (Rydb.) Petr. – not accepted
  Cirsium calcareum (M.E. Jones) Woot. & Standl. – not accepted – Cainville thistle
  Cirsium calcareum var. bipinnatum (Eastw.) S.L. Welsh – not accepted
  Cirsium calcareum var. pulchellum (Greene) S.L. Welsh – not accepted
  Cirsium californicum A. Gray – not accepted
  Cirsium californicum ssp. pseudoreglense Petr. – not accepted
  Cirsium californicum var. bernardinum (Greene) Petr. – not accepted
  Cirsium californicum var. californicum A. Gray – not accepted – California thistle
  Cirsium callilepis (Greene) Jeps. – not accepted
  Cirsium callilepis var. callilepis (Greene) Jeps. – not accepted – fringebract thistle
  Cirsium callilepis var. oregonense (Petr.) J.T. Howell – not accepted
  Cirsium callilepis var. pseudocarlinoides (Petr.) J.T. Howell – not accepted
  Cirsium campylon H.K. Sharsmith – not accepted
  Cirsium candidissimum (Greene) Davidson & Moxley – not accepted
  Cirsium canescens Nutt. – accepted – prairie thistle, Platte thistle
  Cirsium canovirens (Rydb.) Petr. – not accepted – graygreen thistle
  Cirsium canum (L.) All. – accepted – Queen Anne's thistle
  Cirsium carolinianum (Walter) Fernald & B.G. Schub. – accepted – soft thistle, Carolina thistle
  Cirsium centaureae (Rydb.) K. Schum. – not accepted
  Cirsium chellyense J.W. Moore & Frankton – not accepted – queen thistle
  Cirsium chuskaense J.W. Moore & Frankton – not accepted – monarch thistle
  Cirsium ciliolatum (L.F. Hend.) J.T. Howell – accepted – Ashland thistle
  Cirsium clavatum (M.E. Jones) Petr. – accepted – Fish Lake thistle
  Cirsium clavatum var. americanum (A. Gray) D.J. Keil – accepted – Rocky Mountain fringed thistle, fringed thistle, lacy thistle, mountain slope thistle, porcupine thistle, crow thistle, gray thistle
  Cirsium clavatum var. clavatum (M.E. Jones) Petr. – accepted – Fish Lake thistle
  Cirsium clavatum var. osterhoutii (Rydb.) D.J. Keil – accepted – Osterhout's thistle, jeweled thistle
  Cirsium clokeyi S.F. Blake – not accepted – whitespine thistle, Charleston Mountain thistle
  Cirsium coccinatum Osterh. – not accepted
  Cirsium coloradense (Rydb.) Cockerell – not accepted
  Cirsium coloradense ssp. acaulescens (Rydb.) Petr. – not accepted
  Cirsium coloradense ssp. longissimum (A. Heller) Petr. – not accepted
  Cirsium congdonii J.W. Moore & Frankton – not accepted – rosette thistle
  Cirsium coulteri Harv. & A. Gray – not accepted
  Cirsium crassicaule (Greene) Jeps. – accepted – slough thistle
  Cirsium cymosum (Greene) J.T. Howell – accepted – peregrine thistle
  Cirsium cymosum var. canovirens (Rydb.) D.J. Keil – accepted – graygreen thistle
  Cirsium cymosum var. cymosum (Greene) J.T. Howell – accepted – peregrine thistle
  Cirsium davisii Cronquist – not accepted
  Cirsium diffusum (Eastw.) Rydb. – not accepted
  Cirsium discolor (Muhl. ex Willd.) Spreng. – accepted – field thistle
  Cirsium douglasii DC. – accepted – Douglas' thistle
  Cirsium douglasii var. breweri (A. Gray) D.J. Keil & C.E. Turner – accepted – Douglas' thistle
  Cirsium douglasii var. canescens (Petr.) J.T. Howell – not accepted
  Cirsium douglasii var. douglasii DC. – accepted – Douglas' thistle
  Cirsium drummondii Torr. & A. Gray – accepted – dwarf thistle
  Cirsium drummondii ssp. lanatum Petr. – not accepted
  Cirsium drummondii ssp. latisquamum Petr. – not accepted
  Cirsium drummondii ssp. vexans Petr. – not accepted
  Cirsium drummondii var. acaulescens (Rydb.) J.F. Macbr. – not accepted
  Cirsium drummondii var. oregonense Petr. – not accepted
  Cirsium eatonii (A. Gray) B.L. Rob. – accepted – Eaton's thistle, mountaintop thistle
  Cirsium eatonii var. clokeyi (S.F. Blake) D.J. Keil – accepted – Clokey's thistle, Spring Mountains thistle, white-spine thistle
  Cirsium eatonii var. eatonii (A. Gray) B.L. Rob. – accepted – Eaton's thistle, mountaintop thistle
  Cirsium eatonii var. eriocephalum (A. Gray) D.J. Keil – accepted – mountain thistle, alpine thistle
  Cirsium eatonii var. harrisonii S.L. Welsh – not accepted
  Cirsium eatonii var. hesperium (Eastw.) D.J. Keil – accepted – tall mountain thistle
  Cirsium eatonii var. murdockii S.L. Welsh – accepted – northern mountain thistle, Murdock's thistle
  Cirsium eatonii var. peckii (L.F. Hend.) D.J. Keil – accepted – Steens Mountain thistle, ghost thistle
  Cirsium eatonii var. viperinum D.J. Keil – accepted – Snake Range thistle
  Cirsium edule Nutt. – accepted – edible thistle, Hall's thistle, cardoon
  Cirsium edule var. edule Nutt. – accepted – edible thistle, Hall's thistle
  Cirsium edule var. macounii (Greene) D.J. Keil – accepted – Macoun's thistle
  Cirsium edule var. wenatchense D.J. Keil – accepted – Wenatchee thistle
  Cirsium engelmannii Rydb. – accepted – Engelmann's thistle
  Cirsium eriocephalum A. Gray – not accepted
  Cirsium eriocephalum var. leiocephalum D.C. Eaton – not accepted
  Cirsium erosum (Rydb.) K. Schum. – not accepted
  Cirsium filipendulum Engelm. – not accepted
  Cirsium flaccidum Small – not accepted
  Cirsium floccosum (Rydb.) Petr. – not accepted
  Cirsium flodmanii (Rydb.) Arthur – accepted – Flodman's thistle
  Cirsium foliosum (Hook.) DC. – accepted – elk thistle, Drummond's thistle, leafy thistle, meadow thistle
  Cirsium foliosum var. minganense (Victorin) B. Boivin – not accepted – chardon multifeuille variété de la Minganie
  Cirsium fontinale (Greene) Jeps. – accepted – fountain thistle
  Cirsium fontinale var. campylon (H. Sharsm.) Pilz ex Keil & C. Turner – accepted – Mt. Hamilton thistle
  Cirsium fontinale var. fontinale (Greene) Jeps. – accepted – fountain thistle
  Cirsium fontinale var. obispoense J.T. Howell – accepted – Chorro Creek bog thistle
  Cirsium gilense Woot. & Standl. – not accepted – Gila thistle
  Cirsium grahamii A. Gray – accepted – Graham's thistle
  Cirsium griseum (Rydb.) K. Schum. – not accepted – gray thistle
  Cirsium hallii (A. Gray) M.E. Jones – not accepted – Hall's thistle
  Cirsium helenioides (L.) Hill – accepted – melancholy thistle
  Cirsium helleri (Small) Cory – not accepted
  Cirsium hesperium (Eastw.) Petr. – not accepted
  Cirsium heterophyllum (L.) Hill – not accepted
  Cirsium hillii (Canby) Fernald – not accepted – Hill's thistle
  Cirsium hookerianum Nutt. – accepted – white thistle
  Cirsium hookerianum var. eriocephalum (A. Gray) A. Nelson – not accepted
  Cirsium horridulum Michx. – accepted – yellow thistle
  Cirsium horridulum var. elliottii Torr. & A. Gray – not accepted
  Cirsium horridulum var. horridulum Michx. – accepted – yellow thistle
  Cirsium horridulum var. megacanthum (Nutt.) D.J. Keil – accepted
  Cirsium horridulum var. vittatum (Small) R.W. Long – accepted – yellow thistle
  Cirsium howellii Petr. – not accepted
  Cirsium humboldtense Rydb. – not accepted – Humboldt County thistle
  Cirsium hydrophilum (Greene) Jeps. – accepted – Suisun thistle
  Cirsium hydrophilum var. hydrophilum (Greene) Jeps. – accepted – Suisun thistle
  Cirsium hydrophilum var. vaseyi (A. Gray) J.T. Howell – accepted – Vasey's thistle
  Cirsium inamoenum (Greene) D.J. Keil – accepted
  Cirsium inamoenum var. davisii (Cronquist) D.J. Keil – accepted – Davis' thistle
  Cirsium inamoenum var. inamoenum (Greene) D.J. Keil – accepted – Greene's thistle, Jackson Hole thistle
  Cirsium incanum (S.G. Gmel.) Fisch. ex M. Bieb. – not accepted
  Cirsium inornatum Woot. & Standl. – not accepted – Cloudcroft thistle
  Cirsium japonicum Fisch. ex DC. – accepted – Japanese thistle
  Cirsium joanne S.L. Welsh, N.D. Atwood & L.C. Higgins – accepted – Joanna's thistle
  Cirsium kamtschaticum Ledeb. ex DC. – accepted – Kamchatka thistle
  Cirsium kelseyi (Rydb.) Petr. – not accepted
  Cirsium lacerum (Rydb.) Petr. – not accepted
  Cirsium lactucinum Rydb. – not accepted
  Cirsium lanceolatum (L.) Scop., non Hill – not accepted – bull thistle
  Cirsium lanceolatum var. hypoleucum DC. – not accepted
  Cirsium laterifolium (Osterh.) Petr. – not accepted – porcupine thistle
  Cirsium lecontei Torr. & A. Gray – accepted – Le Conte's thistle
  Cirsium loncholepis Petr. – not accepted – La Graciosa thistle
  Cirsium longistylum J.W. Moore & Frankton – accepted – longstyle thistle
  Cirsium macounii (Greene) Rydb. – not accepted
  Cirsium magnificum (A. Nelson) Petr. – not accepted
  Cirsium maritimum (Elmer) Petr. – not accepted
  Cirsium megacephalum (A. Gray) Cockerell – not accepted
  Cirsium mendocinum Petr. – not accepted – Mendocino thistle
  Cirsium mexicanum DC. – accepted – Mexican thistle
  Cirsium minganense Victorin – not accepted
  Cirsium modestum (Osterh.) Cockerell – not accepted – lacy thistle
  Cirsium mohavense (Greene) Petr. – accepted – Mojave thistle, virgin thistle, Rusby's thistle
  Cirsium montigenum Petr. – not accepted
  Cirsium murdockii (S.L. Welsh) Cronquist – not accepted – Murdock's thistle
  Cirsium muticum Michx. – accepted – swamp thistle
  Cirsium muticum var. monticola Fernald – not accepted
  Cirsium muticum var. subpinnatifidum (Britton) Fernald – not accepted
  Cirsium navajoense J.W. Moore & Frankton – not accepted – Navajo thistle
  Cirsium nebraskense (Britton) Lunell – not accepted
  Cirsium nebraskense var. discissum Lunell – not accepted
  Cirsium nelsonii (Pammel) Petr. – not accepted
  Cirsium neomexicanum A. Gray – accepted – New Mexico thistle, powderpuff thistle, Utah thistle, lavender thistle
  Cirsium neomexicanum var. neomexicanum A. Gray – not accepted – New Mexico thistle
  Cirsium neomexicanum var. utahense (Petr.) S.L. Welsh – not accepted – Utah thistle
  Cirsium nidulum (M.E. Jones) Petr. – not accepted
  Cirsium nuttallii DC. – accepted – Nuttall's thistle
  Cirsium oblanceolatum (Rydb.) K. Schum. – not accepted
  Cirsium occidentale (Nutt.) Jeps. – accepted – cobwebby thistle
  Cirsium occidentale var. californicum (A. Gray) Keil & C. Turner – accepted – cobwebby thistle
  Cirsium occidentale var. candidissimum (Greene) J.F. Macbr. – accepted – snowy thistle
  Cirsium occidentale var. compactum Hoover – accepted – compact cobwebby thistle
  Cirsium occidentale var. coulteri (Harv. & A. Gray) Jeps. – accepted – Coulter's thistle
  Cirsium occidentale var. lucianum D.J. Keil – accepted – Cuesta Ridge thistle
  Cirsium occidentale var. occidentale (Nutt.) Jeps. – accepted – cobwebby thistle
  Cirsium occidentale var. venustum (Greene) Jeps. – accepted – cobwebby thistle
  Cirsium ochrocentrum A. Gray – accepted – yellowspine thistle
  Cirsium ochrocentrum ssp. martinii P. Barlow – accepted
  Cirsium ochrocentrum ssp. ochrocentrum A. Gray – accepted – yellowspine thistle
  Cirsium ochrocentrum var. helleri (Small) Petr. – not accepted
  Cirsium odoratum (Muhl. ex W. Bartram) Petr. – not accepted
  Cirsium olivescens (Rydb.) Petr. – not accepted – summer thistle
  Cirsium oreganum Piper – not accepted
  Cirsium oreophilum (Rydb.) K. Schum. – not accepted – crow thistle
  Cirsium osterhoutii (Rydb.) Petr. – not accepted – Osterhout's thistle
  Cirsium ownbeyi S.L. Welsh – accepted – Ownbey's thistle
  Cirsium pallidum Woot. & Standl. – not accepted – pale thistle
  Cirsium palousense Piper – not accepted
  Cirsium palustre (L.) Scop. – accepted – marsh thistle
  Cirsium parryi (A. Gray) Petr. – accepted – Parry's thistle, pale thistle, Cloudcroft thistle, Gila thistle, Mogollon thistle
  Cirsium parryi ssp. mogollonicum C. Schaack & G. Goodwin – not accepted – Mogollon thistle
  Cirsium parryi ssp. parryi (A. Gray) Petr. – not accepted – Parry's thistle
  Cirsium pastoris J.T. Howell – not accepted – snowy thistle
  Cirsium peckii L.F. Hend. – not accepted – Steens Mountain thistle
  Cirsium perennans (Greene) Woot. & Standl. – not accepted
  Cirsium perplexans (Rydb.) Petr. – accepted – Rocky Mountain thistle, spring thistle
  Cirsium pitcheri (Torr. ex Eaton) Torr. & A. Gray – accepted – sand dune thistle, Pitcher's thistle
  Cirsium plattense (Rydb.) Cockerell ex Daniels – not accepted
  Cirsium polyphyllum (Rydb.) Petr. – not accepted
  Cirsium praeteriens J.F. Macbr. – accepted – Palo Alto thistle
  Cirsium proteanum J.T. Howell – not accepted
  Cirsium pugnax Sommier & Levier – not accepted
  Cirsium pulchellum (Greene) Woot. & Standl. – not accepted
  Cirsium pulchellum ssp. bipinnatum (Eastw.) Petr. – not accepted
  Cirsium pulchellum ssp. diffusum (Eastw.) Petr. – not accepted
  Cirsium pulchellum var. glabrescens Petr. – not accepted
  Cirsium pulcherrimum (Rydb.) K. Schum. – accepted – Wyoming thistle
  Cirsium pulcherrimum var. aridum (Dorn) D.J. Keil – accepted – Cedar Rim thistle, desert thistle
  Cirsium pulcherrimum var. pulcherrimum (Rydb.) K. Schum. – accepted – Wyoming thistle
  Cirsium pumilum Spreng. – accepted – pasture thistle
  Cirsium pumilum ssp. hillii (Canby) J.W. Moore & Frankton – not accepted
  Cirsium pumilum var. hillii (Canby) B. Boivin – accepted – Hill's thistle
  Cirsium pumilum var. pumilum Spreng. – accepted – pasture thistle
  Cirsium pyrenaicum (Jacq.) All. – accepted – Pyrenean thistle
  Cirsium quercetorum (A. Gray) Jeps. – accepted – Alameda County thistle
  Cirsium quercetorum var. citrinum Petr. – not accepted
  Cirsium quercetorum var. mendocinum Petr. – not accepted
  Cirsium quercetorum var. quercetorum (A. Gray) Jeps. – not accepted – Alameda County thistle
  Cirsium quercetorum var. walkerianum (Petr.) Jeps. – not accepted – Walker's thistle
  Cirsium quercetorum var. xerolepis Petr. – not accepted – Alameda County thistle
  Cirsium remotifolium (Hook.) DC. – accepted – fewleaf thistle
  Cirsium remotifolium ssp. oregonense Petr. – not accepted – fewleaf thistle
  Cirsium remotifolium ssp. pseudocarlinoides Petr. – not accepted – fewleaf thistle
  Cirsium remotifolium ssp. remotifolium (Hook.) DC. – not accepted – fewleaf thistle
  Cirsium remotifolium var. odontolepis Petr. – accepted – Pacific fringed thistle, fringe-scaled thistle, fewleaf thistle, Mt. Tamalpais thistle
  Cirsium remotifolium var. remotifolium (Hook.) DC. – accepted – fewleaf thistle, remote-leaved thistle
  Cirsium remotifolium var. rivulare Jeps. – accepted – Klamath thistle, Mendocino thistle
  Cirsium repandum Michx. – accepted – sandhill thistle
  Cirsium revolutum (Small) Petr. – not accepted
  Cirsium rhothophilum S.F. Blake – accepted – surf thistle
  Cirsium rothrockii (A. Gray) Petr. – not accepted – Rothrock's thistle
  Cirsium rusbyi (Greene) Petr. – not accepted – Rusby's thistle
  Cirsium rydbergii Petr. – accepted – Rydberg's thistle
  Cirsium scabrum (Poir.) Bonnet & Barratte – accepted – rough thistle
  Cirsium scapanolepis Petr. – not accepted – mountain slope thistle
  Cirsium scariosum Nutt. – accepted – meadow thistle
  Cirsium scariosum var. americanum (A. Gray) D.J. Keil – accepted – dinnerplate thistle, sessile thistle, stemless thistle, Tioga thistle
  Cirsium scariosum var. citrinum (Petr.) D.J. Keil – accepted – La Graciosa thistle
  Cirsium scariosum var. coloradense (Rydb.) D.J. Keil – accepted – Colorado thistle, summer thistle, glory thistle
  Cirsium scariosum var. congdonii (R.J. Moore & Frankton) D.J. Keil – accepted – rosette thistle
  Cirsium scariosum var. robustum D.J. Keil – accepted – Shasta Valley thistle
  Cirsium scariosum var. scariosum Nutt. – accepted – meadow thistle
  Cirsium scariosum var. thorneae S.L. Welsh – accepted – meadow thistle
  Cirsium scariosum var. toiyabense D.J. Keil – accepted – Toiyabe thistle
  Cirsium scopulorum (Greene) Cockerell ex Daniels – not accepted – mountain thistle
  Cirsium setosum (Willd.) Besser ex M. Bieb. – not accepted
  Cirsium smallii Britton – not accepted
  Cirsium spathulifolium Rydb. – not accepted
  Cirsium spinosissimum auct. non (L.) Scop. – not accepted
  Cirsium stenolepidum Nutt. – not accepted
  Cirsium subniveum Rydb. – not accepted – Jackson Hole thistle, gray thistle
  Cirsium terraenigrae Shinners – not accepted
  Cirsium texanum Buckley – accepted – Texas thistle
  Cirsium texanum var. stenolepis Shinners – not accepted
  Cirsium tioganum (Congd.) Petr. – not accepted – stemless thistle
  Cirsium tioganum var. coloradense (Rydb.) Dorn – not accepted – Colorado thistle, stemless thistle
  Cirsium tioganum var. tioganum (Congd.) Petr. – not accepted – Tioga thistle
  Cirsium tracyi (Rydb.) Petr. – accepted – Tracy's thistle
  Cirsium triacanthum Petr. – not accepted
  Cirsium turneri Warnock – accepted – cliff thistle
  Cirsium tweedyi auct. non (Rydb.) Petr. – not accepted
  Cirsium tweedyi (Rydb.) Petr. – not accepted
  Cirsium undulatum (Nutt.) Spreng. – accepted – wavyleaf thistle, gray thistle, wavy-leaf thistle
  Cirsium undulatum var. megacephalum (A. Gray) Fernald – not accepted
  Cirsium undulatum var. tracyi (Rydb.) S.L. Welsh – not accepted – Tracy's thistle, gray thistle, wavyleaf thistle
  Cirsium undulatum var. undulatum (Nutt.) Spreng. – accepted – wavyleaf thistle, gray thistle, wavy-leaf thistle
  Cirsium utahense Petr. – not accepted
  Cirsium validus Greene – accepted – graceful thistle
  Cirsium vaseyi (A. Gray) Jeps. – not accepted
  Cirsium vaseyi var. hydrophilum (Greene) Petr. – not accepted
  Cirsium vernale (Osterh.) Cockerell – not accepted – spring thistle
  Cirsium vinaceum Woot. & Standl. – accepted – Sacramento Mountains thistle
  Cirsium virginense S.L. Welsh – not accepted – virgin thistle
  Cirsium virginianum (L.) Michx. – accepted – Virginia thistle
  Cirsium vittatum Small – not accepted
  Cirsium vulgare (Savi) Ten. – accepted – bull thistle, common thistle, spear thistle
  Cirsium walkerianum Petr. – not accepted
  Cirsium wallowense M. Peck – not accepted
  Cirsium wheeleri (A. Gray) Petr. – accepted – Wheeler's thistle
  Cirsium wrightii A. Gray – accepted – Wright's thistle, Wright's marsh thistle
  Cirsium X canalense Petr. – accepted – canal thistle
  Cirsium X crassum Petr. – accepted – thistle
  Cirsium X erosum (Rydb.) K. Schum. (pro sp.) – not accepted – glory thistle
  Cirsium X iowense (Pammel) Fernald (pro sp.) – accepted – Iowa thistle
  Cirsium X vancouverense J.W. Moore & Frankton – accepted – Vancouver thistle
   

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Disclaimer: ITIS taxonomy is based on the latest scientific consensus available, and is provided as a general reference source for interested parties. However, it is not a legal authority for statutory or regulatory purposes. While every effort has been made to provide the most reliable and up-to-date information available, ultimate legal requirements with respect to species are contained in provisions of treaties to which the United States is a party, wildlife statutes, regulations, and any applicable notices that have been published in the Federal Register. For further information on U.S. legal requirements with respect to protected taxa, please contact the U.S. Fish and Wildlife Service.
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