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Expert: Pieter B. Pelser

ITIS records citing expert
 
 Kingdom Plantae
  Arnoglossum Raf. -- accepted -- arnoglossum, Indian plaintain, Indian plantain
  Arnoglossum album L.C. Anderson -- accepted -- Bay County Indian plantain
  Arnoglossum atriplicifolium (L.) H. Rob. -- accepted -- pale Indian plaintain, pale Indian plantain
  Arnoglossum diversifolium (Torr. & A. Gray) H. Rob. -- accepted -- variableleaf Indian plaintain, variableleaf Indian plantain
  Arnoglossum floridanum (A. Gray) H. Rob. -- accepted -- Florida cacalia
  Arnoglossum muehlenbergii (Sch. Bip.) H. Rob. -- not accepted -- great Indian plaintain
  Arnoglossum ovatum (Walter) H. Rob. -- accepted -- ovateleaf cacalia
  Arnoglossum plantagineum Raf. -- accepted -- arnoglossum, groovestem Indian plantain
  Arnoglossum reniforme (Hook.) H. Rob. -- accepted -- great Indian plantain
  Arnoglossum sulcatum (Fernald) H. Rob. -- accepted -- Georgia Indian plaintain, Georgia Indian plantain
  Barkleyanthus (Kunth) H. Rob. & Brettell -- accepted -- willow ragwort
  Barkleyanthus salicifolius (Kunth) H. Rob. & Brettell -- accepted -- willow ragwort
  Bethencourtia Choisy -- accepted
  Bethencourtia palmensis (Nees) Choisy -- accepted
  Blennosperma Less. -- accepted -- stickyseed
  Blennosperma bakeri Heiser -- accepted -- Baker's stickyseed, Sonoma sunshine
  Blennosperma nanum (Hook.) S.F. Blake -- accepted -- common stickyseed
  Blennosperma nanum var. nanum (Hook.) S.F. Blake -- accepted -- common stickyseed
  Blennosperma nanum var. robustum J.T. Howell -- accepted -- common stickyseed
  Cacalia atriplicifolia L. -- not accepted
  Cacalia auriculata DC. -- not accepted -- cacalia
  Cacalia auriculata ssp. kamtschatica (Maxim.) Hultén -- not accepted
  Cacalia coccinea Sims -- not accepted
  Cacalia decomposita A. Gray -- not accepted
  Cacalia diversifolia Torr. & A. Gray -- not accepted
  Cacalia elliottii (Harper) Shinners -- not accepted
  Cacalia floridana A. Gray -- not accepted
  Cacalia kamtschatica (Maxim.) Kudo -- not accepted
  Cacalia lanceolata Nutt. -- not accepted
  Cacalia lanceolata var. elliottii (Harper) Kral & R.K. Godfrey -- not accepted
  Cacalia lanceolata var. virescens (Harper) Shinners -- not accepted
  Cacalia muehlenbergii (Sch. Bip.) Fernald -- not accepted
  Cacalia muhlenbergii (Sch. Bip.) Fernald -- not accepted
  Cacalia nardosmia A. Gray -- not accepted
  Cacalia nardosmia var. glabrata (Piper) B. Boivin -- not accepted
  Cacalia ovata Walter -- not accepted
  Cacalia paniculata Raf. -- not accepted
  Cacalia plantaginea (Raf.) Shinners -- not accepted
  Cacalia pteranthes Raf. -- not accepted
  Cacalia reniformis Muhl. ex Willd. non Cacalia reniformis Lam. -- not accepted
  Cacalia rotundifolia (Raf.) House -- not accepted
  Cacalia rugelia (A. Gray) T.M. Barkley & Cronquist -- not accepted
  Cacalia sonchifolia L. -- not accepted
  Cacalia suaveolens L. -- not accepted
  Cacalia sulcata Fernald -- not accepted
  Cacalia tuberosa Nutt. -- not accepted
  Cacaliopsis A. Gray -- accepted -- cacaliopsis
  Cacaliopsis nardosmia (A. Gray) A. Gray -- accepted -- silvercrown
  Cacaliopsis nardosmia var. glabrata Piper -- not accepted
  Cineraria congesta R. Br. -- not accepted
  Cineraria salicifolia Kunth -- not accepted
  Crocidium Hook. -- accepted -- spring-gold
  Crocidium multicaule Hook. -- accepted -- common spring-gold
  Delairea Lem. -- accepted -- Cape ivy, Cape-ivy
  Delairea odorata Lem. -- accepted -- Cape ivy, Cape-ivy, German ivy, Italian ivy
  Doronicum L. -- accepted -- false leopardbane
  Doronicum austriacum Jacq. -- accepted
  Doronicum caucasicum M. Bieb. -- not accepted
  Doronicum cordatum Lam. -- not accepted
  Doronicum orientale Hoffmann -- accepted -- oriental false leopardbane, oriental leopard's-bane
  Doronicum pardalianches L. -- accepted -- great false leopardbane
  Doronicum plantagineum L. -- accepted -- plantain false leopardbane
  Emilia Cass. -- accepted -- tasselflower
  Emilia coccinea (Sims) G. Don -- accepted -- scarlet tasselflower
  Emilia fosbergii Nicolson -- accepted -- Florida tasselflower
  Emilia javanica (Burm. f.) C.B. Rob. -- not accepted
  Emilia sonchifolia (L) DC -- accepted -- lilac tasselflower
  Emilia sonchifolia var. javanica (Burm. f.) Mattf. -- not accepted -- lilac tasselflower
  Emilia sonchifolia var. sonchifolia (L) DC -- not accepted -- lilac tasselflower
  Erechtites Raf. -- accepted -- burnweed
  Erechtites agrestis (Sw.) Standl. & Steyerm. -- not accepted
  Erechtites arguta (A. Rich.) DC. -- not accepted
  Erechtites cacalioides (Spreng.) Less. -- not accepted
  Erechtites glomerata (Desf. ex Poir.) DC. -- not accepted -- Australian fireweed, cutleaf burnweed
  Erechtites hieracifolia (L.) Raf. ex DC. -- not accepted -- burnweed
  Erechtites hieraciifolia (L.) Raf. ex DC. -- not accepted -- American burnweed
  Erechtites hieraciifolia var. cacalioides (Fisch. ex Spreng.) Less. ex Griseb. -- not accepted -- American burnweed
  Erechtites hieraciifolia var. hieraciifolia (L.) Raf. ex DC. -- not accepted -- American burnweed
  Erechtites hieraciifolia var. intermedia Fernald -- not accepted
  Erechtites hieraciifolia var. megalocarpa (Fernald) Cronquist -- not accepted -- American burnweed
  Erechtites hieraciifolia var. praealta (Raf.) Fernald -- not accepted
  Erechtites hieraciifolius (L.) Raf. ex DC. -- accepted -- American burnweed, burnweed
  Erechtites hieraciifolius var. cacalioides (Fisch. ex Spreng.) Less. ex Griseb. -- not accepted
  Erechtites hieraciifolius var. hieraciifolius (L.) Raf. ex DC. -- accepted -- American burnweed
  Erechtites hieraciifolius var. megalocarpa (Fernald) Cronquist -- accepted -- American burnweed
  Erechtites megalocarpa Fernald -- not accepted
  Erechtites minima (Poir.) DC. -- not accepted -- Australian fireweed, coastal burnweed
  Erechtites minimus (Poir.) DC. -- accepted -- coastal burnweed
  Erechtites prenanthoides (A. Rich.) DC. -- not accepted
  Erechtites valerianifolia (Link ex Spreng.) DC. -- accepted -- tropical burnweed
  Gynura Cass. -- accepted -- gynura
  Gynura aurantiaca (Blume) DC. -- accepted -- velvetplant
  Hasteola Raf. -- accepted -- false Indian plaintain, false Indian plantain
  Hasteola robertiorum L.C. Anderson -- accepted -- hammockherb
  Hasteola suaveolens (L.) Pojark. -- not accepted
  Jacobaea Burm. -- accepted
  Jacobaea aquatica (Hill) P. Gaertn., B. Mey. & Scherb. -- accepted -- water ragwort
  Jacobaea aquatica var. aquatica (Hill) P. Gaertn., B. Mey. & Scherb. -- accepted
  Jacobaea aquatica var. erratica (Bertol.) Pelser & Meijden -- accepted
  Jacobaea cannabifolia (Less.) E. Wiebe -- accepted -- Aleutian ragwort
  Jacobaea erucifolia (L.) P. Gaertn., B. Mey. & Scherb. -- accepted -- hoary ragwort
  Jacobaea maritima (L.) Pelser & Meijden -- accepted -- dusty miller, silver ragwort
  Jacobaea vulgaris Gaertn. -- accepted -- stinking willie
  Koyamacalia auriculata (DC.) H. Rob. & Brettell -- not accepted -- koyamacalia
  Lepidospartum (A. Gray) A. Gray -- accepted -- broomsage
  Lepidospartum burgessii B.L. Turner -- accepted -- Burgess' broomsage
  Lepidospartum latisquamum S. Watson -- accepted -- Nevada broomsage
  Lepidospartum squamatum (A. Gray) A. Gray -- accepted -- California broomsage, California scalebroom
  Lepidospartum squamatum var. palmeri (A. Gray) L.C. Wheeler -- not accepted
  Ligularia Cass. -- accepted
  Ligularia amplectens (A. Gray) W.A. Weber -- not accepted
  Ligularia amplectens var. holmii (Greene) Dorn -- not accepted
  Ligularia bigelovii (A. Gray) W.A. Weber -- not accepted
  Ligularia bigelovii var. hallii (A. Gray) W.A. Weber -- not accepted
  Ligularia clivorum Maxim. -- not accepted
  Ligularia dentata (A. Gray) H. Hara -- accepted -- summer ragwort
  Ligularia holmii (Greene) W.A. Weber -- not accepted
  Ligularia porteri (Greene) W.A. Weber -- not accepted
  Ligularia pudica (Greene) W.A. Weber -- not accepted
  Ligularia soldanella (A. Gray) W.A. Weber -- not accepted
  Ligularia taraxacoides (A. Gray) W.A. Weber -- not accepted
  Ligularia websteri (Greenm.) W.A. Weber -- not accepted
  Luina nardosmia (A. Gray) Cronquist -- not accepted
  Luina nardosmia var. glabrata (Piper) Cronquist -- not accepted
  Luina stricta (Greene) B.L. Rob. -- not accepted
  Mesadenia atriplicifolia (L.) Raf. -- not accepted
  Mesadenia diversifolia (Torr. & A. Gray) Greene -- not accepted
  Mesadenia elliottii Harper -- not accepted
  Mesadenia floridana (A. Gray) Greene -- not accepted
  Mesadenia lanceolata (Nutt.) Raf. -- not accepted
  Mesadenia lanceolata var. virescens Harper -- not accepted
  Mesadenia maxima Harper -- not accepted
  Mesadenia reniformis (Hook.) Raf. -- not accepted
  Mesadenia sulcata (Fernald) Harper -- not accepted
  Mesadenia tuberosa (Nutt.) Britton -- not accepted
  Nardosmia arctica (A.E. Porsild) A. Löve & D. Löve -- not accepted
  Nardosmia japonica Siebold & Zucc. -- not accepted
  Nardosmia vitifolia (Greene) A. Löve & D. Löve -- not accepted
  Odontotrichum decompositum (A. Gray) Rydb. -- not accepted
  Packera Á. Löve & D. Löve -- accepted -- ragwort
  Packera actinella (Greene) W.A. Weber & A. Löve -- not accepted
  Packera anonyma (Alph. Wood) W.A. Weber & Á. Löve -- accepted -- Small's ragwort
  Packera antennariifolia (Britton) W.A. Weber & Á. Löve -- accepted -- shale barren ragwort, shalebarren ragwort
  Packera aurea (L.) Á. Löve & D. Löve -- accepted -- golden ragwort
  Packera bernardina (Greene) W.A. Weber & Á. Löve -- accepted -- San Bernardino ragwort
  Packera bolanderi (A. Gray) W.A. Weber & Á. Löve -- accepted -- Bolander's ragwort
  Packera bolanderi var. bolanderi (A. Gray) W.A. Weber & Á. Löve -- accepted -- Bolander's ragwort
  Packera bolanderi var. harfordii (Greenm.) D.K. Trock & T.M. Barkley -- accepted -- Harford's ragwort
  Packera breweri (Burtt Davy) W.A. Weber & Á. Löve -- accepted -- Brewer's ragwort
  Packera buekii D.K. Trock & T.M. Barkley -- not accepted
  Packera cana (Hook.) W.A. Weber & Á. Löve -- accepted -- woolly groundsel
  Packera cardamine (Greene) W.A. Weber & Á. Löve -- accepted -- bittercress ragwort
  Packera castoreus (S.L. Welsh) Kartesz -- accepted -- Beaver Mountain ragwort
  Packera clevelandii (Greene) W.A. Weber & Á. Löve -- accepted -- Cleveland's ragwort
  Packera contermina (Greenm.) J.F. Bain -- accepted -- northwestern groundsel
  Packera crocata (Rydb.) W.A. Weber & Á. Löve -- accepted -- saffron ragwort
  Packera cymbalaria (Pursh) W.A. Weber & Á. Löve -- accepted -- dwarf arctic ragwort
  Packera cymbalarioides (Nutt.) W.A. Weber & Á. Löve -- not accepted -- cleftleaf groundsel
  Packera cynthioides (Greene) W.A. Weber & Á. Löve -- accepted -- White Mountain ragwort
  Packera debilis (Nutt.) W.A. Weber & Á. Löve -- accepted -- weak groundsel
  Packera dimorphophylla (Greene) W.A. Weber & Á. Löve -- accepted -- splitleaf groundsel
  Packera dimorphophylla ssp. dimorphophylla (Greene) W.A. Weber & Á. Löve -- not accepted -- splitleaf groundsel
  Packera dimorphophylla ssp. intermedia (T.M. Barkley) W.A. Weber & Á. Löve -- not accepted
  Packera dimorphophylla var. dimorphophylla (Greene) W.A. Weber & Á. Löve -- accepted -- splitleaf groundsel
  Packera dimorphophylla var. intermedia (T.M. Barkley) D.K. Trock & T.M. Barkley -- accepted -- splitleaf groundsel
  Packera dimorphophylla var. paysonii (T.M. Barkley) D.K. Trock & T.M. Barkley -- accepted -- Payson's groundsel
  Packera eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve -- accepted -- widehead groundsel
  Packera eurycephala var. eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve -- accepted -- widehead groundsel
  Packera eurycephala var. lewisrosei (J.T. Howell) J.F. Bain -- accepted -- Lewis' groundsel
  Packera fendleri (A. Gray) W.A. Weber & Á. Löve -- accepted -- Fendler's ragwort
  Packera fernaldii (Greenm.) Á. Löve & D. Löve -- not accepted
  Packera flettii (Wiegand) W.A. Weber & Á. Löve -- accepted -- Flett's ragwort
  Packera franciscana (Greene) W.A. Weber & Á. Löve -- accepted -- San Francisco Peaks ragwort
  Packera ganderi (T.M. Barkley & R.M. Beauch.) W.A. Weber & Á. Löve -- accepted -- Gander's ragwort
  Packera glabella (Poir.) C. Jeffrey -- accepted -- butterweed
  Packera greenei (A. Gray) W.A. Weber & Á. Löve -- accepted -- flame ragwort
  Packera hartiana (A. Heller) W.A. Weber & Á. Löve -- accepted -- Hart's ragwort, Mogollon Mountain ragwort
  Packera hesperia (Greene) W.A. Weber & Á. Löve -- accepted -- western ragwort
  Packera hyperborealis (Greenm.) Á. Löve & D. Löve -- accepted -- northern groundsel
  Packera indecora (Greene) Á. Löve & D. Löve -- accepted -- elegant groundsel
  Packera ionophylla (Greene) W.A. Weber & Á. Löve -- accepted -- Tehachapi ragwort
  Packera layneae (Greene) W.A. Weber & Á. Löve -- accepted -- Layne's ragwort
  Packera macounii (Greene) W.A. Weber & Á. Löve -- accepted -- Siskiyou Mountain ragwort
  Packera malmstenii (S.F. Blake ex Tidestr.) Kartesz -- accepted -- Podunk ragwort
  Packera millefolia (Torr. & A. Gray) W.A. Weber & Á. Löve -- accepted -- piedmont ragwort
  Packera millelobata (Rydb.) W.A. Weber & Á. Löve -- accepted -- Uinta ragwort
  Packera moresbiensis (Calder & Roy L. Taylor) J.F. Bain -- not accepted
  Packera multilobata (Torr. & A. Gray ex A. Gray) W.A. Weber & Á. Löve -- accepted -- lobeleaf groundsel
  Packera musiniensis (S.L. Welsh) Trock -- accepted -- Musinea ragwort
  Packera neomexicana (A. Gray) W.A. Weber & Á. Löve -- accepted -- New Mexico groundsel
  Packera neomexicana var. metcalfei (Greene) D.K. Trock & T.M. Barkley -- not accepted -- Metcalf's groundsel
  Packera neomexicana var. mutabilis (Greene) W.A. Weber & Á. Löve -- accepted -- Metcalf's groundsel, New Mexico groundsel
  Packera neomexicana var. neomexicana (A. Gray) W.A. Weber & Á. Löve -- accepted -- New Mexico groundsel
  Packera neomexicana var. toumeyi (Greene) D.K. Trock & T.M. Barkley -- accepted -- Toumey's groundsel
  Packera obovata (Muhl. ex Willd.) W.A. Weber & Á. Löve -- accepted -- roundleaf ragwort
  Packera ogotorukensis (Packer) Á. Löve & D. Löve -- accepted -- Ogotoruk Creek ragwort
  Packera oodes (Rydb.) W.A. Weber -- not accepted
  Packera pauciflora (Pursh) Á. Löve & D. Löve -- accepted -- alpine groundsel
  Packera paupercula (Michx.) Á. Löve & D. Löve -- accepted -- balsam groundsel
  Packera plattensis (Nutt.) W.A. Weber & Á. Löve -- accepted -- prairie groundsel
  Packera porteri (Greene) C. Jeffrey -- accepted -- Porter's groundsel
  Packera pseudaurea (Rydb.) W.A. Weber & Á. Löve -- accepted -- falsegold groundsel
  Packera pseudaurea ssp. flavula (Greene) W.A. Weber & Á. Löve -- not accepted
  Packera pseudaurea var. flavula (Greene) D.K. Trock & T.M. Barkley -- accepted -- falsegold groundsel
  Packera pseudaurea var. pseudaurea (Rydb.) W.A. Weber & Á. Löve -- accepted -- falsegold groundsel
  Packera pseudaurea var. semicordata (Mack. & Bush) D.K. Trock & T.M. Barkley -- accepted -- falsegold groundsel
  Packera quaerens (Greene) W.A. Weber & Á. Löve -- not accepted -- Mogollon Mountain ragwort
  Packera quercetorum (Greene) C. Jeffrey -- accepted -- Oak Creek ragwort
  Packera resedifolia (Less.) Á. Löve & D. Löve -- not accepted
  Packera sanguisorboides (Rydb.) W.A. Weber & Á. Löve -- accepted -- burnet ragwort
  Packera schweinitziana (Nutt.) W.A. Weber & Á. Löve -- accepted -- Schweinitz's ragwort
  Packera spellenbergii (T.M. Barkley) C. Jeffrey -- accepted -- Carrizo Creek ragwort
  Packera streptanthifolia (Greene) W.A. Weber & Á. Löve -- accepted -- cleftleaf groundsel, Rocky Mountain groundsel
  Packera streptanthifolia var. rubricaulis (Greene) Dorn -- not accepted
  Packera streptanthifolia var. streptanthifolia (Greene) W.A. Weber & Á. Löve -- not accepted
  Packera subnuda (DC.) D.K. Trock & T.M. Barkley -- accepted -- Buek's groundsel
  Packera subnuda var. moresbiensis (Calder & Roy L. Taylor) Trock -- accepted -- cleftleaf ragwort
  Packera subnuda var. subnuda (DC.) D.K. Trock & T.M. Barkley -- accepted
  Packera tampicana (DC.) C. Jeffrey -- accepted -- Great Plains ragwort
  Packera texana O'Kennon & Trock -- accepted
  Packera tomentosa (Michx.) C. Jeffrey -- accepted -- woolly ragwort
  Packera tridenticulata (Rydb.) W.A. Weber & Á. Löve -- accepted -- threetooth ragwort
  Packera werneriifolia (A. Gray) W.A. Weber & Á. Löve -- accepted -- hoary groundsel
  Packera werneriifolia var. alpina (A. Gray) Dorn -- not accepted
  Parasenecio W.W. Sm. & Small -- accepted -- Indian plantain
  Parasenecio auriculata (DC.) J.R. Grant -- accepted -- eared Indian plantain
  Pericallis Webb -- accepted -- ragwort
  Pericallis cuneata (L'Hér.) Bolle -- not accepted -- common ragwort
  Pericallis cuneata (DC.) Webb & Bethel. non (Roth) Webb & Bethel. -- not accepted
  Pericallis hybrida B. Nord. -- accepted -- common ragwort
  Pericallis murrayi (Bornm.) B. Nord. -- accepted
  Pericallis webbii (Sch. Bip.) Bolle -- accepted
  Petasites Mill. -- accepted -- butterbur
  Petasites alaskanus Rydb. -- not accepted
  Petasites arcticus A.E. Porsild -- not accepted
  Petasites corymbosus (R. Br.) Rydb. -- not accepted
  Petasites dentatus Blank. -- not accepted
  Petasites frigidus (L.) Fr. -- accepted -- arctic sweet coltsfoot, arctic sweet-colt's-foot
  Petasites frigidus ssp. arcticus (A.E. Porsild) Cody -- not accepted
  Petasites frigidus ssp. nivalis (Greene) Cody -- not accepted
  Petasites frigidus ssp. palmatus (Aiton) Cody -- not accepted
  Petasites frigidus var. corymbosus (R. Br.) Cronquist -- not accepted
  Petasites frigidus var. frigidus (L.) Fr. -- accepted -- arctic sweet coltsfoot
  Petasites frigidus var. hyperboreoides Hultén -- not accepted
  Petasites frigidus var. nivalis (Greene) Cronquist -- not accepted -- arctic sweet coltsfoot
  Petasites frigidus var. palmatus (Aiton) Cronquist -- accepted -- arctic sweet coltsfoot, arctic sweet-colt's-foot
  Petasites frigidus var. sagittatus (Banks ex Pursh) Chern. -- accepted -- arrowleaf sweet coltsfoot
  Petasites frigidus var. vitifolius (Greene) Chern. -- accepted
  Petasites gracilis Britton -- not accepted
  Petasites hookerianus (Nutt.) Rydb. -- not accepted
  Petasites hybridus (L.) G. Gaertn., B. Mey. & Scherb. -- accepted -- pestilence wort
  Petasites hyperboreus Rydb. -- not accepted
  Petasites japonicus (Siebold & Zucc.) Maxim. -- accepted -- Japanese sweet coltsfoot
  Petasites nivalis Greene -- not accepted
  Petasites nivalis ssp. vitifolius (Greene) Toman -- not accepted
  Petasites officinalis Moench -- not accepted
  Petasites palmatus (Aiton) A. Gray -- not accepted
  Petasites palmatus var. frigidus Macoun -- not accepted
  Petasites sagittatus (Banks ex Pursh) A. Gray -- not accepted -- arrow butterbur, arrow-leaf sweet-colt's-foot, arrowleaf sweet coltsfoot
  Petasites speciosus (Nutt.) Piper -- not accepted
  Petasites trigonophylla Greene -- not accepted
  Petasites vulgaris Hill -- not accepted
  Petasites warrenii H. St. John -- not accepted
  Petasites X vitifolius Greene (pro sp.) -- not accepted -- sweet coltsfoot
  Psacalium Cass. -- accepted -- Indianbush, psacalium
  Psacalium decompositum (A. Gray) H. Rob. & Brettell -- accepted -- desert Indianbush, psacalium
  Pseudogynoxys (Greenm.) Cabrera -- accepted -- pseudogynoxys
  Pseudogynoxys chenopodioides (Kunth) Cabrera -- accepted -- Mexican flamevine
  Rainiera Greene -- accepted -- rainiera
  Rainiera stricta (Greene) Greene -- accepted -- false silverback
  Roldana Llave ex Lex. -- accepted -- groundsel
  Roldana carlomasonii (B.L. Turner & T.M. Barkley) C. Jeffrey -- not accepted
  Roldana hartwegii (Benth.) H. Rob. & Brettell -- accepted -- Hartweg's groundsel
  Roldana petasitis (Sims) H. Rob. & Brettell -- accepted -- California geranium, velvet groundsel
  Rugelia Shuttlw. ex Chapm. -- accepted -- Rugel's Indianplantain
  Rugelia nudicaulis Shuttlw. ex Chapm. -- accepted -- Rugel's Indianplantain
  Senecio L. -- accepted -- groundsel, ragwort
  Senecio actinella Greene -- accepted -- Flagstaff ragwort
  Senecio actinella var. mogollonicus (Greene) Greenm. -- not accepted
  Senecio acutidens Rydb. -- not accepted
  Senecio adamsii Howell -- not accepted
  Senecio admirabilis Greene -- not accepted
  Senecio alabamensis Britton ex Small -- not accepted
  Senecio alaskanus Hultén -- not accepted
  Senecio ambrosioides Rydb. -- not accepted
  Senecio amplectens A. Gray -- accepted -- alpine groundsel, showy alpine groundsel, showy alpine ragwort
  Senecio amplectens var. amplectens A. Gray -- accepted -- showy alpine ragwort
  Senecio amplectens var. holmii (Greene) H.D. Harr. -- accepted -- Holm's groundsel, Holm's ragwort
  Senecio amplectens var. taraxacoides A. Gray -- not accepted
  Senecio ampullaceus Hook. -- accepted -- Texas ragwort
  Senecio anonymus Alph. Wood -- not accepted -- Small's ragwort
  Senecio antennariifolius Britton -- not accepted -- shalebarren ragwort
  Senecio aphanactis Greene -- accepted -- chaparral ragwort
  Senecio aquaticus Hill -- not accepted
  Senecio aquaticus ssp. barbareifolius (Wimm. & Grab.) S.M. Walters -- not accepted
  Senecio argutus A. Rich. -- not accepted
  Senecio arizonicus Greene -- accepted -- Arizona ragwort
  Senecio aronicoides DC. -- accepted -- rayless ragwort
  Senecio astephanus Greene -- accepted -- San Gabriel ragwort
  Senecio atratus Greene -- accepted -- tall blacktip ragwort
  Senecio atropurpureus (Ledeb.) Fedtsch. -- not accepted -- arctic senecio
  Senecio atropurpureus ssp. frigidus (Richardson) Hultén -- not accepted
  Senecio atropurpureus ssp. tomentosus (Kjellm.) Hultén -- not accepted
  Senecio atropurpureus var. dentatus (A. Gray) Hultén -- not accepted
  Senecio atropurpureus var. ulmeri (Steffen) A.E. Porsild -- not accepted
  Senecio aureus L. -- not accepted -- golden ragwort
  Senecio aureus var. aquilonius Fernald -- not accepted
  Senecio aureus var. borealis Torr. & A. Gray -- not accepted
  Senecio aureus var. gracilis (Pursh) Hook. -- not accepted
  Senecio aureus var. intercursus Fernald -- not accepted
  Senecio aureus var. semicordatus (Mack. & Bush) Greenm. -- not accepted
  Senecio aureus var. werneriifolius A. Gray -- not accepted
  Senecio balsamitae Muhl. ex Willd. -- not accepted
  Senecio bernardinus Greene -- not accepted -- San Bernardino ragwort
  Senecio bicolor (Willd.) Todaro -- not accepted -- silver ragwort
  Senecio bicolor ssp. cineraria (DC.) Chater -- not accepted -- silver ragwort
  Senecio bigelovii A. Gray -- accepted -- nodding ragwort
  Senecio bigelovii var. bigelovii A. Gray -- accepted -- Bigelow ragwort, Bigelow's ragwort, nodding ragwort
  Senecio bigelovii var. hallii A. Gray -- accepted -- Hall's ragwort
  Senecio bivestitus Cronquist -- not accepted
  Senecio blitoides Greene -- not accepted
  Senecio blochmaniae Greene -- accepted -- dune ragwort
  Senecio bolanderi A. Gray -- not accepted -- Bolander's ragwort
  Senecio bolanderi var. bolanderi A. Gray -- not accepted -- Bolander's ragwort
  Senecio bolanderi var. harfordii (Greenm.) T.M. Barkley -- not accepted -- Harford's ragwort
  Senecio breweri Burtt Davy -- not accepted -- Brewer's ragwort
  Senecio cacalioides Fisch. ex Spreng. -- not accepted
  Senecio californicus DC. -- accepted -- California ragwort
  Senecio cannabifolius Less. -- not accepted -- Aleutian ragwort
  Senecio cannabinifolius Hook. & Arn. -- accepted -- hempleaf ragwort
  Senecio canus Hook. -- not accepted -- woolly groundsel
  Senecio cardamine Greene -- not accepted -- bittercress ragwort
  Senecio carlomasonii B.L. Turner & T.M. Barkley -- not accepted -- Carl Mason's ragwort
  Senecio carthamoides Greene -- not accepted
  Senecio castoreus S.L. Welsh -- not accepted
  Senecio cernuus A. Gray non L. f. -- not accepted
  Senecio cineraria DC. -- not accepted
  Senecio clarkianus A. Gray -- accepted -- Clark's ragwort
  Senecio cleavelandii Greene -- not accepted
  Senecio clevelandii Greene -- not accepted -- Cleveland's ragwort
  Senecio clevelandii var. heterophyllus Hoover -- not accepted
  Senecio clivorum Maxim. -- not accepted -- summer ragwort
  Senecio columbianus Greene -- not accepted
  Senecio confusus Britten -- not accepted
  Senecio congestus (R. Br.) DC. -- not accepted -- clustered marsh ragwort, marsh fleabane
  Senecio congestus ssp. tonsus (Fernald) Á. Löve & D. Löve -- not accepted
  Senecio congestus var. palustris (L.) Fernald -- not accepted
  Senecio congestus var. tonsus Fernald -- not accepted
  Senecio conterminus Greenm. -- not accepted -- senecio
  Senecio convallium Greenm. -- not accepted
  Senecio covillei Greene -- not accepted
  Senecio covillei var. scorzonella (Greene) Jeps. -- not accepted
  Senecio crassulus A. Gray -- accepted -- meadow groundsel, thickleaf groundsel, thickleaf ragwort
  Senecio crassulus var. cusickii (Piper) Greenm. -- not accepted
  Senecio crawfordii Britton -- not accepted
  Senecio crepidineus Greene -- not accepted
  Senecio crocatus Rydb. -- not accepted -- saffron ragwort
  Senecio crocatus var. wolfii Greenm. -- not accepted
  Senecio cruentus DC. -- not accepted
  Senecio cymbalaria Pursh -- not accepted -- dwarf arctic groundsel, dwarf arctic ragwort, séneçon fausse-cymbalaire
  Senecio cymbalarioides Nutt. non Senecio cymbalarioides H. Buek -- not accepted -- cleftleaf groundsel
  Senecio cymbalarioides H. Buek -- not accepted
  Senecio cymbalarioides ssp. moresbiensis Calder & Roy L. Taylor -- not accepted
  Senecio cymbalarioides var. borealis (Torr. & A. Gray) Greenm. -- not accepted
  Senecio cymbalarioides var. suksdorfii (Greenm.) M. Peck -- not accepted
  Senecio cynthioides Greene -- not accepted -- White Mountain ragwort
  Senecio debilis Nutt. -- not accepted -- weak groundsel
  Senecio densus Greene -- not accepted
  Senecio dimorphophyllus Greene -- not accepted -- splitleaf groundsel
  Senecio dimorphophyllus var. dimorphophyllus Greene -- not accepted -- splitleaf groundsel
  Senecio dimorphophyllus var. intermedius T.M. Barkley -- not accepted -- splitleaf groundsel
  Senecio dimorphophyllus var. paysonii T.M. Barkley -- not accepted -- Payson's groundsel
  Senecio discoideus (Hook.) Britton -- not accepted
  Senecio douglasii DC. -- not accepted
  Senecio douglasii ssp. longilobus (Benth.) W.A. Weber -- not accepted
  Senecio douglasii var. jamesii (Torr. & A. Gray) Ediger ex Correll & M.C. Johnst. -- not accepted
  Senecio douglasii var. longilobus (Benth.) L.D. Benson -- not accepted
  Senecio douglasii var. monoensis (Greene) Jeps. -- not accepted
  Senecio douglasii var. tularensis Munz -- not accepted
  Senecio elegans L. -- accepted -- redpurple ragwort
  Senecio elmeri Piper -- accepted -- Elmer's ragwort
  Senecio eremophilus Richardson -- accepted -- desert groundsel, desert ragwort
  Senecio eremophilus ssp. kingii (Rydb.) G.W. Douglas & G. Ruyle-Douglas -- not accepted
  Senecio eremophilus ssp. macdougalii (A. Heller) G.W. Douglas & G. Ruyle-Douglas -- not accepted
  Senecio eremophilus var. eremophilus Richardson -- accepted -- desert ragwort
  Senecio eremophilus var. kingii (Rydb.) Greenm. -- accepted -- King's groundsel, King's ragwort, ragwort groundsel
  Senecio eremophilus var. macdougalii (A. Heller) Cronquist -- accepted -- MacDougal's groundsel, MacDougal's ragwort
  Senecio erraticus Bertol. -- not accepted
  Senecio ertterae T.M. Barkley -- accepted -- Ertter's ragwort
  Senecio erucifolius L. -- not accepted -- hoary ragwort
  Senecio eurycephalus Torr. & A. Gray -- not accepted -- widehead groundsel
  Senecio eurycephalus var. eurycephalus Torr. & A. Gray -- not accepted -- Siskiyou ragwort
  Senecio eurycephalus var. lewisrosei (J.T. Howell) T.M. Barkley -- not accepted -- Lewis' groundsel
  Senecio eurypterus Greenm. -- not accepted
  Senecio exaltatus Nutt. -- not accepted
  Senecio fedifolius Rydb. -- not accepted
  Senecio fendleri A. Gray -- not accepted -- Fendler's ragwort
  Senecio fendleri var. lanatus Osterh. -- not accepted
  Senecio filifolius Nutt. non P.J. Bergius -- not accepted
  Senecio flaccidus Less. -- accepted -- threadleaf groundsel, threadleaf ragwort
  Senecio flaccidus var. douglasii (DC.) B.L. Turner & T.M. Barkley -- accepted -- Douglas' groundsel, Douglas' ragwort, Douglas' senecio
  Senecio flaccidus var. flaccidus Less. -- accepted -- threadleaf groundsel, threadleaf ragwort
  Senecio flaccidus var. monoensis (Greene) B.L. Turner & T.M. Barkley -- accepted -- green groundsel, Mono groundsel, Mono ragwort
  Senecio flavulus Greene -- not accepted
  Senecio flettii Wiegand -- not accepted -- Flett's ragwort
  Senecio foetidus J.T. Howell -- not accepted
  Senecio foetidus var. hydrophiloides (Rydb.) T.M. Barkley ex Cronquist -- not accepted
  Senecio franciscanus Greene -- not accepted -- San Francisco Peaks groundsel, San Francisco Peaks ragwort
  Senecio fremontii Torr. & A. Gray -- accepted -- dwarf mountain ragwort, Fremont's groundsel
  Senecio fremontii ssp. blitoides (Greene) W.A. Weber -- not accepted
  Senecio fremontii ssp. occidentalis (A. Gray) G.W. Douglas & G. Ruyle-Douglas -- not accepted
  Senecio fremontii var. blitoides (Greene) Cronquist -- accepted -- dwarf mountain ragwort
  Senecio fremontii var. fremontii Torr. & A. Gray -- accepted -- dwarf mountain ragwort
  Senecio fremontii var. inexpectatus Cronquist -- accepted -- dwarf mountain ragwort
  Senecio fremontii var. occidentalis A. Gray -- accepted -- dwarf mountain ragwort, western groundsel
  Senecio frigidus (Richardson) Less. -- not accepted
  Senecio fulgens Rydb. -- not accepted
  Senecio fuscatus auct. non Hayek -- not accepted -- fuscatus groundsel
  Senecio ganderi T.M. Barkley & R.M. Beauch. -- not accepted -- Gander's ragwort
  Senecio gaspensis Greenm. -- not accepted
  Senecio gaspensis var. firmifolius (Greenm.) Fernald -- not accepted
  Senecio gibbsonsii Greene -- not accepted
  Senecio glabellus Poir. -- not accepted -- butterweed, cressleaf, cressleaf groundsel
  Senecio glaucifolius Rydb. -- not accepted
  Senecio glomeratus Desf. ex Poir. -- accepted -- cutleaf burnweed
  Senecio gracilis Pursh -- not accepted
  Senecio greenei A. Gray -- not accepted -- flame ragwort
  Senecio greggii Rydb. -- not accepted
  Senecio hallii Britton -- not accepted
  Senecio hallii var. discoidea W.A. Weber -- not accepted
  Senecio harbourii Rydb. -- not accepted
  Senecio harfordii Greenm. -- not accepted
  Senecio hartianus A. Heller -- not accepted -- Hart's ragwort
  Senecio hartwegii Benth. -- not accepted
  Senecio hesperius Greene -- not accepted -- western ragwort
  Senecio heterodoxus Greene ex Rydb. -- not accepted
  Senecio hieraciifolia L. -- not accepted
  Senecio hieraciifolius L. -- not accepted
  Senecio holmii Greene -- not accepted
  Senecio hookeri Torr. & A. Gray -- not accepted
  Senecio howellii Greene -- not accepted
  Senecio huachucanus A. Gray -- not accepted
  Senecio hybridus (Willd.) Regel -- not accepted
  Senecio hydrophiloides Rydb. -- accepted -- tall groundsel
  Senecio hydrophilus Nutt. -- accepted -- alkali marsh groundsel, water groundsel, water ragwort
  Senecio hyperborealis Greenm. -- not accepted -- northern groundsel
  Senecio imparipinnatus Klatt -- not accepted
  Senecio indecorus Greene -- not accepted -- elegant groundsel
  Senecio integerrimus Nutt. -- accepted -- lamb-tongue ragwort, lambstongue groundsel, lambstongue ragwort
  Senecio integerrimus var. exaltatus (Nutt.) Cronquist -- accepted -- Columbia groundsel, Columbia ragwort
  Senecio integerrimus var. integerrimus Nutt. -- accepted -- lambstongue ragwort
  Senecio integerrimus var. lugens (Richardson) B. Boivin -- not accepted
  Senecio integerrimus var. major (A. Gray) Cronquist -- accepted -- lambstongue groundsel, lambstongue ragwort
  Senecio integerrimus var. ochroleucus (A. Gray) Cronquist -- accepted -- paleyellow ragwort
  Senecio integerrimus var. scribneri (Rydb.) T.M. Barkley -- accepted -- Scribner's ragwort
  Senecio integerrimus var. vaseyi (Greenm.) Cronquist -- not accepted
  Senecio integrifolius (L.) Clairv. -- not accepted
  Senecio ionophyllus Greene -- not accepted -- Tehachapi ragwort
  Senecio ionophyllus var. sparsilobatus (Parish) H.M. Hall -- not accepted
  Senecio jacobaea L. -- not accepted -- ragwort, stinking willie, tansy ragwort
  Senecio jonesii Rydb. -- not accepted
  Senecio kingii Rydb. -- not accepted
  Senecio kjellmanii A.E. Porsild -- not accepted
  Senecio laetiflorus Greene -- not accepted
  Senecio layneae Greene -- not accepted -- Layne's butterweed, Layne's ragwort
  Senecio lemmonii A. Gray -- accepted -- Lemmon's groundsel, Lemmon's ragwort
  Senecio leonardii Rydb. -- not accepted
  Senecio lewisrosei J.T. Howell -- not accepted
  Senecio ligulifolius Greene -- not accepted
  Senecio lindstroemii (Ostenf.) A.E. Porsild -- not accepted
  Senecio lobatus Pers. -- not accepted
  Senecio longilobus Benth. -- not accepted
  Senecio longipetiolatus Rydb. -- not accepted
  Senecio lugens Richardson -- accepted -- small blacktip ragwort
  Senecio lugens var. exaltatus (Nutt.) A. Gray -- not accepted
  Senecio lugens var. ochroleucus A. Gray -- not accepted
  Senecio lynceus Greene -- not accepted
  Senecio lynceus var. leucoreus (Greenm.) S.F. Blake -- not accepted
  Senecio lyonii A. Gray -- accepted -- island senecio
  Senecio macdougalii A. Heller -- not accepted
  Senecio macounii Greene -- not accepted -- Siskiyou Mountain ragwort
  Senecio madagascariensis Poir. -- accepted -- fireweed, Madagascar groundsel, Madagascar ragwort
  Senecio magnificus F. Muell. -- accepted -- tall yellowtop
  Senecio malmstenii S.F. Blake ex Tidestr. -- not accepted
  Senecio manitobensis Greenm. -- not accepted
  Senecio megacephalus Nutt. -- accepted -- rocky ragwort
  Senecio memmingeri Britton -- not accepted
  Senecio metcalfei Greene -- not accepted
  Senecio mikanioides Otto -- not accepted -- Cape-ivy, capeivy
  Senecio millefolium Torr. & A. Gray -- not accepted -- piedmont ragwort
  Senecio millefolius Torr. & A. Gray -- not accepted
  Senecio millelobatus Rydb. -- not accepted -- Uinta ragwort
  Senecio minimus Poir. -- not accepted
  Senecio mohavensis A. Gray -- accepted -- Mohave groundsel, Mojave ragwort
  Senecio molinarius Greenm. -- not accepted
  Senecio monoensis Greene -- not accepted
  Senecio moresbiensis (Calder & Roy L. Taylor) G.W. Douglas & G. Ruyle-Douglas -- not accepted -- cleftleaf ragwort
  Senecio muehlenbergii Sch. Bip. -- not accepted
  Senecio muirii Greenm. -- not accepted
  Senecio multicapitatus Greenm. ex Rydb. -- not accepted
  Senecio multidentatus Sch. Bip. ex Hemsl. -- accepted -- Huachuca Mountain ragwort
  Senecio multidentatus var. huachucanus (A. Gray) T.M. Barkley -- accepted -- Huachuca Mountain ragwort
  Senecio multidentatus var. multidentatus Sch. Bip. ex Hemsl. -- accepted
  Senecio multilobatus Torr. & A. Gray ex A. Gray -- not accepted -- lobeleaf groundsel
  Senecio murrayi Bornm. -- not accepted
  Senecio musiniensis S.L. Welsh -- not accepted -- Musinea ragwort
  Senecio mutabilis Greene -- not accepted
  Senecio neomexicanus A. Gray -- not accepted -- New Mexico groundsel
  Senecio neomexicanus var. griffithsii Greenm. -- not accepted
  Senecio neomexicanus var. metcalfei (Greene) T.M. Barkley -- not accepted -- Metcalf's groundsel
  Senecio neomexicanus var. mutabilis (Greene) T.M. Barkley -- not accepted -- New Mexico groundsel
  Senecio neomexicanus var. neomexicanus Gray -- not accepted -- New Mexico groundsel
  Senecio neomexicanus var. toumeyi (Greene) T.M. Barkley -- not accepted -- Toumey's groundsel
  Senecio neowebsteri S.F. Blake -- accepted -- Olympic Mountain ragwort
  Senecio obovatus Muhl. ex Willd. -- not accepted -- round-leaf groundsel, roundleaf ragwort, séneçon ŕ feuilles obovales
  Senecio obovatus var. elliottii (Torr. & A. Gray) Fernald -- not accepted
  Senecio obovatus var. rotundus Britton -- not accepted
  Senecio ogotorukensis Packer -- not accepted -- Ogotoruk Creek ragwort
  Senecio oodes Rydb. -- not accepted
  Senecio oresbius Greenm. -- not accepted
  Senecio palmensis (Nees) C. Sm. ex Link -- not accepted
  Senecio palustris (L.) Hook. -- not accepted
  Senecio pammelii Greenm. -- not accepted
  Senecio parryi A. Gray -- accepted -- mountain ragwort, Parry's groundsel
  Senecio pattersonensis Hoover -- accepted -- Mono groundsel, Patterson's senecio
  Senecio pauciflorus Pursh -- not accepted -- alpine groundsel
  Senecio pauciflorus var. fallax (Greenm.) Greenm. -- not accepted
  Senecio pauciflorus var. jucundulus Jeps. -- not accepted
  Senecio pauperculus Michx. -- not accepted -- balsam groundsel
  Senecio pauperculus var. balsamitae (Muhl. ex Willd.) Fernald -- not accepted
  Senecio pauperculus var. crawfordii (Britton) T.M. Barkley -- not accepted
  Senecio pauperculus var. firmifolius (Greenm.) Greenm. -- not accepted
  Senecio pauperculus var. neoscoticus Fernald -- not accepted
  Senecio pauperculus var. praelongus (Greenm.) House -- not accepted
  Senecio pauperculus var. thompsoniensis (Greenm.) B. Boivin -- not accepted
  Senecio pereziifolius Rydb. -- not accepted
  Senecio petasitis (Sims) DC. -- not accepted
  Senecio plattensis Nutt. -- not accepted -- prairie groundsel
  Senecio platylobus Rydb. -- not accepted
  Senecio porteri Greene -- not accepted -- Porter's groundsel
  Senecio pseudaureus Rydb. -- not accepted -- falsegold groundsel
  Senecio pseudaureus ssp. flavulus (Greene) G.W. Douglas & G. Ruyle-Douglas -- not accepted
  Senecio pseudaureus ssp. semicordatus (Mack. & Bush) G.W. Douglas & G. Ruyle-Douglas -- not accepted
  Senecio pseudaureus var. flavulus (Greene) Greenm. -- not accepted -- falsegold groundsel
  Senecio pseudaureus var. pseudaureus Rydb. -- not accepted -- falsegold groundsel
  Senecio pseudaureus var. semicordatus (Mack. & Bush) T.M. Barkley -- not accepted -- falsegold groundsel
  Senecio pseudoarnica Less. -- accepted -- seaside ragwort
  Senecio pseudotomentosus Mack. & Bush -- not accepted
  Senecio pudicus Greene -- accepted -- bashful ragwort
  Senecio purshianus Nutt. -- not accepted
  Senecio quaerens Greene -- not accepted -- Mogollon Mountain ragwort
  Senecio quaylei T.M. Barkley -- accepted -- Quayle's ragwort
  Senecio quercetorum Greene -- not accepted -- Oak Creek ragwort
  Senecio rapifolius Nutt. -- accepted -- openwoods ragwort
  Senecio resedifolius Less. -- not accepted
  Senecio riddellii Torr. & A. Gray -- accepted -- Riddell's groundsel, Riddell's ragwort, sand groundsel
  Senecio robbinsii Oakes ex Rusby -- not accepted
  Senecio rotundus (Britton) Small -- not accepted
  Senecio rubricaulis Greene -- not accepted
  Senecio rugelia A. Gray -- not accepted
  Senecio rupestris Waldst. & Kit. -- accepted -- rock ragwort
  Senecio sacramentanus Woot. & Standl. -- accepted -- Sacramento ragwort
  Senecio salignus DC. -- not accepted -- willow ragwort
  Senecio sandvicensis auct. non Less. -- not accepted
  Senecio sandwicensis auct. non Less. -- not accepted
  Senecio sanguisorboides Rydb. -- not accepted -- burnet ragwort
  Senecio saxosus Klatt -- not accepted
  Senecio saxosus var. toiyabensis Greenm. -- not accepted
  Senecio schweinitzianus Nutt. -- not accepted -- Schweinitz's ragwort
  Senecio scorzonella Greene -- accepted -- Sierra groundsel, Sierra ragwort
  Senecio scribneri Rydb. -- not accepted
  Senecio seemanii auct. non Sch. Bip. ex Seem. -- not accepted
  Senecio semicordatus Mack. & Bush -- not accepted
  Senecio serra Hook. -- accepted -- butterweed, butterweed groundsel, tall ragwort
  Senecio serra var. admirabilis (Greene) A. Nelson -- accepted -- tall ragwort
  Senecio serra var. altior Jeps. -- not accepted
  Senecio serra var. integriusculus A. Gray -- not accepted
  Senecio serra var. serra Hook. -- accepted -- tall groundsel, tall ragwort
  Senecio sheldonensis A.E. Porsild -- accepted -- Mt. Sheldon ragwort
  Senecio smallii Britton -- not accepted
  Senecio soldanella A. Gray -- accepted -- Colorado ragwort
  Senecio spartioides Torr. & A. Gray -- accepted -- broom groundsel, broom-like ragwort, broomlike ragwort
  Senecio spartioides var. fremontii (Torr. & A. Gray) Greenm. -- not accepted
  Senecio spartioides var. granularis Maguire & A.H. Holmgren ex Cronquist -- not accepted
  Senecio spartioides var. multicapitatus (Greenm. ex Rydb.) S.L. Welsh -- not accepted -- broom-like ragwort, many-head ragwort, ragwort groundsel
  Senecio spartioides var. parksii (Cory) Shinners -- not accepted
  Senecio spartioides var. spartioides Torr. & A. Gray -- not accepted -- broom-like ragwort
  Senecio spellenbergii T.M. Barkley -- not accepted -- Carrizo Creek ragwort
  Senecio sphaerocephalus Greene -- accepted -- ballhead ragwort, marsh groundsel
  Senecio spribillei W.A. Weber -- accepted
  Senecio squalidus L. -- accepted -- Oxford ragwort
  Senecio streptanthifolius Greene -- not accepted -- cleftleaf groundsel
  Senecio streptanthifolius var. borealis (Torr. & A. Gray) J.F. Bain -- not accepted -- Rocky Mountain groundsel
  Senecio streptanthifolius var. kluanei J.F. Bain -- not accepted -- Kluane's senecio
  Senecio streptanthifolius var. laetiflorus (Greene) J.F. Bain -- not accepted -- Rocky Mountain groundsel
  Senecio streptanthifolius var. moresbiensis (Calder & Roy L. Taylor) B. Boivin -- not accepted
  Senecio streptanthifolius var. oodes (Rydb.) J.F. Bain -- not accepted -- Rocky Mountain groundsel
  Senecio streptanthifolius var. rubricaulis (Greene) J.F. Bain -- not accepted -- Rocky Mountain groundsel
  Senecio streptanthifolius var. streptanthifolius Greene -- not accepted -- cleftleaf groundsel
  Senecio streptanthifolius var. wallowensis J.F. Bain -- not accepted -- Wallowa senecio
  Senecio stygius Greene -- not accepted
  Senecio suaveolens (L.) Ell. -- accepted -- false Indian plantain
  Senecio subcuneatus Rydb. -- not accepted
  Senecio subnudus DC. -- not accepted
  Senecio suksdorfii Greenm. -- not accepted
  Senecio sylvatica L. -- not accepted
  Senecio sylvaticus L. -- accepted -- woodland ragwort
  Senecio tampicanus DC. -- not accepted -- Great Plains ragwort
  Senecio taraxacoides (A. Gray) Greene -- accepted -- dandelion ragwort
  Senecio thornberi Greenm. -- not accepted
  Senecio thurberi A. Gray -- not accepted
  Senecio tichomirovii auct. non Schischkin -- not accepted
  Senecio toiyabensis S.L. Welsh & Goodrich -- not accepted
  Senecio tomentosus Michx. -- not accepted -- woolly ragwort
  Senecio toumeyi Greene -- not accepted
  Senecio triangularis Hook. -- accepted -- arrowleaf groundsel, arrowleaf ragwort
  Senecio triangularis var. angustifolius G.N. Jones -- not accepted
  Senecio tridenticulatus Rydb. -- not accepted -- threetooth ragwort
  Senecio tundricola auct. non Tolm. -- not accepted
  Senecio tweedyi Rydb. -- not accepted
  Senecio uintahensis (A. Nelson) Greenm. -- not accepted
  Senecio valerianifolius Link ex Spreng. -- not accepted
  Senecio vaseyi Greenm. -- not accepted
  Senecio viscosus L. -- accepted -- sticky ragwort
  Senecio vulgaris L. -- accepted -- common groundsel, old-man-in-the-spring
  Senecio wardii Greene -- not accepted
  Senecio warnockii Shinners -- accepted -- Warnock's ragwort
  Senecio webbii (Sch. Bip.) Christ -- not accepted
  Senecio websteri Greenm. non Hook. f. -- not accepted
  Senecio werneriifolius (A. Gray) A. Gray -- not accepted -- hoary groundsel
  Senecio werneriifolius var. alpinus (A. Gray) Dorn -- not accepted
  Senecio werneriifolius var. incertus Greenm. -- not accepted
  Senecio wootonii Greene -- accepted -- Wooton's ragwort
  Senecio wrightii Greenm. -- not accepted
  Senecio X hybridus (Willd.) Regel -- not accepted -- common ragwort, florist's cineraria
  Senecio yukonensis A.E. Porsild -- not accepted -- Yukon groundsel
  Synosma Raf. ex Britt. -- not accepted -- synosma
  Synosma suaveolens (L.) Raf. ex Britton -- not accepted
  Tephroseris (Rchb.) Rchb. -- accepted -- groundsel
  Tephroseris atropurpurea ssp. atropurpurea (Ledeb.) Holub -- not accepted
  Tephroseris atropurpurea ssp. frigida (Richardson) A. Löve & D. Löve -- not accepted
  Tephroseris atropurpurea ssp. tomentosa (Kjellm.) A. Löve & D. Löve -- not accepted
  Tephroseris frigida (Richardson) Holub -- accepted
  Tephroseris integrifolia (L.) Holub -- accepted
  Tephroseris integrifolia ssp. atropurpurea (Ledeb.) B. Nord. -- accepted -- arctic groundsel
  Tephroseris kjellmanii (A.E. Porsild) Holub -- accepted -- Kjellman's groundsel
  Tephroseris lindstroemii (Ostenf.) A. Löve & D. Löve -- accepted -- fuscate groundsel
  Tephroseris palustris (L.) Reichenbach -- accepted -- marsh fleabane
  Tephroseris tundricola (Tolm.) Holub -- accepted
  Tephroseris tundricola var. lindstroemii (Ostenf.) V. Yu. -- not accepted
  Tephroseris yukonensis (A.E. Porsild) Holub -- accepted -- Yukon groundsel
  Tetradymia DC. -- accepted -- horsebrush, tetradymia
  Tetradymia argyraea Munz & Roos -- accepted -- striped cottonthorn, striped horsebrush
  Tetradymia axillaris A. Nelson -- accepted -- longspine horsebrush
  Tetradymia axillaris var. axillaris A. Nelson -- accepted -- longspine horsebrush
  Tetradymia axillaris var. longispina (M.E. Jones) Strother -- accepted -- longspine horsebrush
  Tetradymia canescens DC. -- accepted -- gray horsebrush, spineless horsebrush
  Tetradymia canescens var. inermis (Rydb.) Payson -- not accepted
  Tetradymia comosa A. Gray -- accepted -- hairy horsebrush
  Tetradymia comosa ssp. tetrameres S.F. Blake -- not accepted
  Tetradymia filifolia Greene -- accepted -- threadleaf horsebrush
  Tetradymia glabrata Torr. & A. Gray -- accepted -- littleleaf horsebrush
  Tetradymia nuttallii Torr. & A. Gray -- accepted -- Nuttall's horsebrush
  Tetradymia spinosa Hook. & Arn. -- accepted -- shortspine horsebrush, spiny horsebrush
  Tetradymia spinosa var. longispina M.E. Jones -- not accepted
  Tetradymia stenolepis Greene -- accepted -- Mojave cottonthorn, Mojave horsebrush
  Tetradymia tetrameres (S.F. Blake) Strother -- accepted -- four-part horsebrush, fourpart horsebrush
  Tussilago L. -- accepted -- coltsfoot
  Tussilago farfara L. -- accepted -- colts foot, coltsfoot
  Yermo Dorn -- accepted -- desert yellowhead
  Yermo xanthocephalus Dorn -- accepted -- desert yellowhead
   

A gray bar