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Expert: David J. Keil

ITIS records citing expert
 
 Kingdom Plantae
  Arctium L. -- accepted -- burdock, burrdock
  Arctium lappa L. -- accepted -- bardane, great burdock, greater burdock, greater burrdock, woodland burdock
  Arctium minus Bernh. -- accepted -- bardane, beggar's button, burdock, common burdock, lesser burdock, lesser burrdock, small burdock, smaller burdock, wild burdock, wild rhubarb
  Arctium minus ssp. nemorosum (Lej. & Court.) Syme -- not accepted
  Arctium nemorosum Lej. & Court. -- not accepted
  Arctium tomentosum Mill. -- accepted -- woolly burdock, woolly burrdock
  Arctium vulgare (Hill) Evans -- not accepted -- woodland burrdock
  Arctium X mixtum Nyman -- accepted -- burrdock
  Arctium X nothum (Ruhmer) J. Weiss -- accepted -- burrdock
  Breea arvensis (L.) Less. -- not accepted
  Breea incana (S.G. Gmel.) W.A. Weber -- not accepted
  Carduus altissimus L. -- not accepted
  Carduus americanus (A. Gray) Rydb. -- not accepted
  Carduus araneosus Osterh. -- not accepted
  Carduus arvensis (L.) Robson -- not accepted
  Carduus austrinus Small -- not accepted
  Carduus carolinianus Walter -- not accepted
  Carduus coloradensis Rydb. -- not accepted
  Carduus discolor (Muhl. ex Willd.) Nutt. -- not accepted
  Carduus helenioides L. -- not accepted
  Carduus helenoides L. orth. var. -- not accepted
  Carduus helleri Small -- not accepted
  Carduus inamoenus Greene -- not accepted
  Carduus lanceolatus L. -- not accepted
  Carduus lecontei (Torr. & A. Gray) Pollard -- not accepted
  Carduus macounii Greene -- not accepted
  Carduus muticus (Michx.) Pers. -- not accepted
  Carduus nevadensis Greene -- not accepted
  Carduus nuttallii (DC.) Pollard -- not accepted
  Carduus pinetorum Small -- not accepted
  Carduus pulchellus Greene -- not accepted
  Carduus pumilus Nutt. -- not accepted
  Carduus repandus (Michx.) Pers. -- not accepted
  Carduus smallii (Britton) H.E. Ahles -- not accepted
  Carduus spathulatus Osterh. -- not accepted
  Carduus spinosissimus Walter -- not accepted
  Carduus tracyi Rydb. -- not accepted
  Carduus truncatus Greene -- not accepted
  Carduus undulatus Nutt. -- not accepted
  Carduus undulatus var. canescens (Nutt.) Porter -- not accepted
  Carduus virginianus L. -- not accepted
  Carduus vulgaris Savi -- not accepted
  Chthonia glaucescens Cass. -- not accepted
  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 -- roadside thistle, tall 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 -- Anderson's thistle, rose 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 -- monarch thistle, Navajo thistle, queen 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 -- Californian thistle, Canada thistle, Canadian 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 -- Platte thistle, prairie 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 -- Carolina thistle, soft 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 -- crow thistle, fringed thistle, gray thistle, lacy thistle, mountain slope thistle, porcupine thistle, Rocky Mountain fringed thistle
  Cirsium clavatum var. clavatum (M.E. Jones) Petr. -- accepted -- Fish Lake thistle
  Cirsium clavatum var. osterhoutii (Rydb.) D.J. Keil -- accepted -- jeweled thistle, Osterhout's thistle
  Cirsium clokeyi S.F. Blake -- not accepted -- Charleston Mountain thistle, whitespine 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 -- alpine thistle, mountain 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 -- Murdock's thistle, northern mountain thistle
  Cirsium eatonii var. peckii (L.F. Hend.) D.J. Keil -- accepted -- ghost thistle, Steens Mountain thistle
  Cirsium eatonii var. viperinum D.J. Keil -- accepted -- Snake Range thistle
  Cirsium edule Nutt. -- accepted -- cardoon, edible thistle, Hall's thistle
  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 -- Drummond's thistle, elk 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, Rusby's thistle, virgin 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 -- lavender thistle, New Mexico thistle, powderpuff thistle, Utah 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 -- Cloudcroft thistle, Gila thistle, Mogollon thistle, pale thistle, Parry's 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 -- Pitcher's thistle, sand dune 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 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 -- fewleaf thistle, fringe-scaled thistle, Mt. Tamalpais thistle, Pacific fringed 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, glory thistle, summer 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 -- gray thistle, Jackson Hole 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 -- gray thistle, wavy-leaf thistle, wavyleaf thistle
  Cirsium undulatum var. megacephalum (A. Gray) Fernald -- not accepted
  Cirsium undulatum var. tracyi (Rydb.) S.L. Welsh -- not accepted -- gray thistle, Tracy's thistle, wavyleaf thistle
  Cirsium undulatum var. undulatum (Nutt.) Spreng. -- accepted -- gray thistle, wavy-leaf thistle, wavyleaf 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 marsh thistle, Wright's 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
  Cnicus amplifolius Greene -- not accepted
  Cnicus arizonicus A. Gray -- not accepted
  Cnicus breweri var. vaseyi A. Gray -- not accepted
  Cnicus calcareus M.E. Jones -- not accepted
  Cnicus drummondii var. acaulescens Rydb. -- not accepted
  Cnicus ochrocentrus (A. Gray) A. Gray -- not accepted
  Cnicus parryi A. Gray -- not accepted
  Cnicus tioganus Congd. -- not accepted
  Cnicus undulatus var. megacephalus A. Gray -- not accepted
  Cnicus wheeleri A. Gray -- not accepted
  Crepis occidentalis var. nevadensis Kellogg -- not accepted
  Crupina (Pers.) DC. -- accepted -- crupina
  Crupina vulgaris Cass. -- accepted -- bearded creeper, common crupina
  Crupina vulgaris var. brachypappa P. Beauv. -- accepted
  Crupina vulgaris var. vulgaris Cass. -- accepted -- common crupina
  Lappa major Gaertn. -- not accepted
  Lappa minor Hill -- not accepted
  Pectis L. -- accepted -- chinchweed, cinchweed, fetid marigold, fetidmarigold
  Pectis angustifolia Torr. -- accepted -- lemonscent, narrowleaf pectis
  Pectis angustifolia var. angustifolia Torr. -- accepted -- lemonscent, narrowleaf pectis
  Pectis angustifolia var. fastigiata (A. Gray) Keil -- accepted -- lemonscent
  Pectis angustifolia var. tenella (DC.) Keil -- accepted -- lemonscent
  Pectis carthusianorum Less. -- accepted -- Caribbean chinchweed, Caribbean cinchweed
  Pectis ciliaris L. -- accepted -- donkeyweed
  Pectis coulteri Harv. & A. Gray -- accepted -- Coulter's cinchweed
  Pectis cylindrica (Fernald) Rydb. -- accepted -- Sonoran chinchweed, Sonoran cinchweed
  Pectis elongata Kunth -- accepted -- tropical chinchweed, tropical cinchweed
  Pectis elongata var. elongata Kunth -- accepted -- tropical chinchweed
  Pectis elongata var. floribunda (A. Rich.) Keil -- accepted -- tropical chinchweed, tropical cinchweed
  Pectis febrifuga H.C. Hall -- not accepted
  Pectis filipes Harv. & A. Gray -- accepted -- five-bract cinchweed, fivebract chinchweed, fivebract cinchweed
  Pectis filipes var. filipes Harv. & A. Gray -- accepted
  Pectis filipes var. subnuda Fernald -- accepted -- fivebract chinchweed, fivebract cinchweed
  Pectis floribunda A. Rich. -- not accepted
  Pectis glaucescens (Cass.) Keil -- accepted -- sanddune chinchweed, sanddune cinchweed
  Pectis humifusa Sw. -- accepted -- yerba de San Juan
  Pectis imberbis A. Gray -- accepted -- beardless chinchweed, beardless cinchweed
  Pectis leptocephala (Cass.) Urb. -- not accepted
  Pectis linearifolia Urb. -- accepted -- Florida chinchweed, Florida cinchweed
  Pectis linearis Llave -- accepted -- West Indian chinchweed, West Indian cinchweed
  Pectis linifolia L. -- accepted -- narrowleaf lemonweed, romero macho
  Pectis longipes A. Gray -- accepted -- longstalk chinchweed, longstalk cinchweed, mat cinchweed
  Pectis multisetosa Rydb. -- not accepted
  Pectis palmeri S. Watson -- not accepted
  Pectis papposa Harv. & A. Gray -- accepted -- cinchweed, cinchweed fetidmarigold, manybristle chinchweed, manybristle cinchweed
  Pectis papposa var. grandis Keil -- accepted -- manybristle chinchweed, manybristle cinchweed
  Pectis papposa var. papposa Harv. & A. Gray -- accepted -- many-bristle cinchweed, manybristle chinchweed, manybristle cinchweed
  Pectis portoricensis Urb. -- not accepted
  Pectis postrata var. cylindrica Fernald -- not accepted
  Pectis prostrata Cav. -- accepted -- spreading chinchweed, spreading cinchweed
  Pectis prostrata var. cylindrica Fernald -- not accepted
  Pectis prostrata var. urceolata Fernald -- not accepted
  Pectis rusbyi Greene ex A. Gray -- accepted -- Rusby's chinchweed, Rusby's cinchweed
  Pectis tenella DC. -- not accepted
  Pectis tenuicaulis Urb. -- accepted -- island chinchweed, island cinchweed
  Pectis texana Cory -- not accepted
  Pectis X floridana Keil -- accepted -- hybrid Florida cinchweed
  Serratula arvensis L. -- not accepted
   

A gray bar