| | |
| Erigeron alaskanus Cronquist | Erigeron hyperboreus Greene trib. Astereae |
| Erigeron alexeenkoi (Krasch.) Botsch. | Psychrogeton alexeenkoi Krasch. trib. Astereae |
| Erigeron alpestris Hoppe ex Nyman | Erigeron alpinus L. trib. Astereae |
| Erigeron alpinus eriocalyx Ledeb., Fl. Altaic. [Ledebour] 4: 91 (1833) | Erigeron eriocalyx (Ledeb.) Vierh. trib. Astereae |
| Erigeron alpinus Less. | Erigeron caucasicus Steven trib. Astereae |
| Erigeron alpinus neglectus (A.Kern.) O.BolĂłs & Vigo | Erigeron neglectus A.Kern. trib. Astereae |
| Erigeron alpinus oreades (Schrenk) Trautv. | Erigeron oreades (Schrenk) Fisch. & C.A.Mey. trib. Astereae |
| Erigeron amorphoglossus Boiss. | Psychrogeton amorphoglossus (Boiss.) Novopokr. trib. Astereae |
| Erigeron amphibolus Ledeb. | Erigeron caucasicus Steven trib. Astereae |
| Erigeron andicola humilior Vierh. | Erigeron andicola DC. trib. Astereae |
| Erigeron andicola pleiocephalus Vierh. | Erigeron cinereus Hook. & Arn. trib. Astereae |
| Erigeron andinus Phil. | Erigeron andicola DC. trib. Astereae |
| Erigeron angustatus (A,Gray) Greene | Erigeron reductus (Cronquist) G.L.Nesom trib. Astereae |
| Erigeron angustifolius Rydb. | Erigeron peregrinus (Pursh) Greene trib. Astereae |
| Erigeron aphanactis aphanactis (A.Gray) Cronquist | Erigeron aphanactis (A.Gray) Greene trib. Astereae |
| Erigeron araucanus Phil. | Erigeron andicola DC. trib. Astereae |
| Erigeron armenus Boiss. & A.Huet ex Boiss. | Erigeron caucasicus Steven trib. Astereae |
| Erigeron arthuri B.Boivin | Erigeron aureus Greene trib. Astereae |
| Erigeron asper Nutt. | Erigeron glabellus Nutt. trib. Astereae |
| Erigeron aureus acutifolius Raup | Erigeron aureus Greene trib. Astereae |
| Erigeron australis Phil. | Symphyotrichum glabrifolium (DC.) G.L.Nesom trib. Astereae |
| Erigeron awapensis S.L.Welsh | Erigeron abajoensis Cronquist trib. Astereae |
| Erigeron bellidioides (D.Don) Benth. ex C.B.Clarke | Erigeron emodi I.M.Turner trib. Astereae |
| Erigeron berteoranus DC. | Erigeron fasciculatus Colla trib. Astereae |
| Erigeron berteroanus DC. | Erigeron fasciculatus Colla trib. Astereae |
| Erigeron berteroanus prostratus (Phil.) Reiche | Erigeron othonnifolius Hook. & Arn. trib. Astereae |
| Erigeron biflorus Phil. | Erigeron andicola DC. trib. Astereae |
| Erigeron biramosus Botsch. | Psychrogeton biramosus (Botsch.) Grierson trib. Astereae |
| Erigeron bistiensis G.L.Nesom & Hevron | Erigeron pulcherrimus A.Heller trib. Astereae |
| Erigeron bizgensis Rech.f. | Psychrogeton amorphoglossus (Boiss.) Novopokr. trib. Astereae |
| Erigeron blasdalei Greene | Erigeron foliosus Nutt. trib. Astereae |
| Erigeron bonplandii Buchanan | Celmisia bonplandii (Buchanan) Allan trib. Astereae |
| Erigeron borealis alpiniformis (Cronquist) �.Löve | Erigeron alpiniformis Cronquist trib. Astereae |
| Erigeron brachyspermus Botsch. | Psychrogeton brachyspermus (Botsch.) Grierson trib. Astereae |
| Erigeron brandegeei A.Gray | Erigeron concinnus (Hook. & Arn.) Torr. & A.Gray trib. Astereae |
| Erigeron brevicaulis Phil. | Erigeron leptopetalus Phil. trib. Astereae |
| Erigeron breweri elmeri (Greene) Jeps. | Erigeron elmeri (Greene) Greene trib. Astereae |
| Erigeron breweri klamathensis G.L.Nesom, Phytologia 72: 175 (1992) | Erigeron klamathensis (G.L.Nesom) G.L.Nesom trib. Astereae |
| Erigeron brittonianus Rusby | Erigeron rosulatus Wedd. trib. Astereae |
| Erigeron cabrerae Solbrig | Erigeron andicola DC. trib. Astereae |
| Erigeron cabulicus (Boiss.) Botsch. | Psychrogeton cabulicum Boiss. trib. Astereae |
| Erigeron caespitosus grandiflorus (Hook.) Torr. & A.Gray | Erigeron caespitosus Nutt. trib. Astereae |
| Erigeron caespitosus nauseosus M.E.Jones, Proc. Calif. Acad. Sci., ser. 2. 5: 696 (1895) | Erigeron nauseosus (M.E.Jones) A.Nelson trib. Astereae |
| Erigeron caespitosus tener A.Gray, Bot. California [W.Brerwer] 1: 328 (1876) | Erigeron tener (A.Gray) A.Gray trib. Astereae |
| Erigeron californicus (Less.) Jeps. | Erigeron glaucus Ker Gawl. trib. Astereae |
| Erigeron callianthemus Greene | Erigeron glacialis (Nutt.) A.Nelson trib. Astereae |
| Erigeron canescens (Hook.) Torr. & A.Gray | Erigeron caespitosus Nutt. trib. Astereae |
| Erigeron capusii (Franch.) Novopokr. | Crinitaria grimmii (Regel & Schmalh.) Grierson trib. Astereae |
| Erigeron carringtoniae S.L.Welsh | Erigeron untermannii S.L.Welsh & Goodrich trib. Astereae |
| Erigeron chelanensis H.St.John | Erigeron leibergii Piper trib. Astereae |
| Erigeron chionophilus Boiss. | Psychrogeton chionophilus (Boiss.) Krasch. trib. Astereae |
| Erigeron chionophilus leptophyllus Cuatrec. | Erigeron chionophilus Wedd. trib. Astereae |
| Erigeron ciliaris Phil. | Erigeron andicola DC. trib. Astereae |
| Erigeron cinerascens Sch.Bip. | Conyza deserticola Phil. trib. Astereae |
| Erigeron cochlerifolius Phil | Erigeron myosotis Pers. trib. Astereae |
| Erigeron coeruleus Popov | Erigeron tianschanicus Botsch. trib. Astereae |
| Erigeron compactus consimilis (Cronquist) S.F.Blake | Erigeron consimilis Cronquist trib. Astereae |
| Erigeron compositus discoideus A.Gray | Erigeron compositus Pursh trib. Astereae |
| Erigeron compositus pinnatisectus A.Gray, Proc. Amer. Acad. Arts 16: 90 (1880) | Erigeron pinnatisectus (A.Gray) A.Nelson trib. Astereae |
| Erigeron compositus trifidus (Hook.) A.Gray | Erigeron trifidus Hook. trib. Astereae |
| Erigeron concinnus aphanactis A.Gray, Proc. Amer. Acad. Arts 6: 540 (1865) | Erigeron aphanactis (A.Gray) Greene trib. Astereae |
| Erigeron consanguineus Ledeb. | Erigeron alpicola (Makino) Makino trib. Astereae |
| Erigeron controversus Greene | Erigeron garrettii A.Nelson trib. Astereae |
| Erigeron covillei Greene, Erythea 3(2): 20 (1895) | Erigeron breweri A.Gray trib. Astereae |
| Erigeron coxii Phil. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron crocifolius (Kunth) Wedd. | Oritrophium crocifolium (Kunth) Cuatrec. trib. Astereae |
| Erigeron curvifolius Piper | Erigeron chrysopsidis A.Gray trib. Astereae |
| Erigeron decumbens Benth. | Erigeron foliosus Nutt. trib. Astereae |
| Erigeron delavayi (Franch.) Botsch. | Aster diplostephioides (DC.) Benth. ex C.B.Clarke trib. Astereae |
| Erigeron delicatus Cronquist | Erigeron cervinus Greene trib. Astereae |
| Erigeron deminutus Wooton & Standl. | Erigeron formosissimus Greene trib. Astereae |
| Erigeron diplostephioides (DC.) Botsch. | Aster diplostephioides (DC.) Benth. ex C.B.Clarke trib. Astereae |
| Erigeron discernendus Rech.f. | Erigeron pseuderiocephalus Popov trib. Astereae |
| Erigeron divergens Hook. | Erigeron flagellaris A.Gray trib. Astereae |
| Erigeron dolichostylus Botsch. | Psychrogeton cabulicum Boiss. trib. Astereae |
| Erigeron douglasii Torr. & A.Gray | Erigeron foliosus Nutt. trib. Astereae |
| Erigeron dubius (Thunb.) Makino | Erigeron thunbergii A.Gray trib. Astereae |
| Erigeron dubius alpicola Makino, Alp. Pl. Japan [Miyoshi & Makino] 1: t. 21 (1906) | Erigeron alpicola (Makino) Makino trib. Astereae |
| Erigeron dusenii Vierh. | Erigeron cinereus Hook. & Arn. trib. Astereae |
| Erigeron eatonii molestus Cronquist | Erigeron eatonii A.Gray trib. Astereae |
| Erigeron edelbergii Rech.f. & Koië | Psychrogeton cabulicum Boiss. trib. Astereae |
| Erigeron elbursensis Vierh. | Erigeron elborsensis Boiss. trib. Astereae |
| Erigeron elexeenkoi (Krasch.) Botsch. | Psychrogeton alexeenkoi Krasch. trib. Astereae |
| Erigeron elkoensis A.Nelson & J.F.Macbr. | Erigeron asperugineus (D.C.Eaton) A.Gray trib. Astereae |
| Erigeron ellisii Hook. | Erigeron roylei DC. trib. Astereae |
| Erigeron engelmannii davisii Cronquist, Leafl. W. Bot. 3: 167 (1942) | Erigeron davisii (Cronquist) G.L.Nesom trib. Astereae |
| Erigeron erianthus Speg. | Erigeron leptopetalus Phil. trib. Astereae |
| Erigeron eriocephalus Regel & Schmalh. | Erigeron schmalhausenii Popov trib. Astereae |
| Erigeron falconeri (C.B.Clarke) Botsch. | Aster falconeri (C.B.Clarke) Hutch. trib. Astereae |
| Erigeron farreri (W.W.Sm. & Jeffrey) Botsch. | Aster farreri W.W.Sm. & Jeffrey trib. Astereae |
| Erigeron feddei (H.LĂ©v. & Vaniot) Botsch. | Aster spathulifolius Maxim. trib. Astereae |
| Erigeron fernandezii Phil. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron filifolius bloomeri (A.Gray) A.Nelson | Erigeron bloomeri A.Gray trib. Astereae |
| Erigeron filifolius curvifolius (Piper) A.Nelson | Erigeron chrysopsidis A.Gray trib. Astereae |
| Erigeron filifolius robustior M.Peck | Erigeron filifolius (Hook.) Nutt. trib. Astereae |
| Erigeron flaccidus (Bunge) Botsch. | Aster flaccidus Bunge trib. Astereae |
| Erigeron flagellaris trilobatus Maguire ex Cronquist, Brittonia 6: 258 (1947) | Erigeron sionis Cronquist trib. Astereae |
| Erigeron flexuosus Cronquist | Erigeron lassenianus Greene trib. Astereae |
| Erigeron florifer Hook. | Townsendia florifera (Hook.) A.Gray trib. Astereae |
| Erigeron foliosus blochmaniae (Greene) H.M.Hall | Erigeron blochmaniae Greene trib. Astereae |
| Erigeron foliosus covillei (Greene) Compton | Erigeron breweri A.Gray trib. Astereae |
| Erigeron foliosus tenuissimis A.Gray | Erigeron foliosus Nutt. trib. Astereae |
| Erigeron fragilis Greene | Erigeron foliosus Nutt. trib. Astereae |
| Erigeron frigidum Wedd. | Oritrophium limnophilum (Sch.Bip.) Cuatrec. trib. Astereae |
| Erigeron frigidus Boiss. & Buhse ex Boiss. | Erigeron caucasicus Steven trib. Astereae |
| Erigeron frondeus Greene | Erigeron coulteri Porter & J.M.Coult. trib. Astereae |
| Erigeron fruticetorum Rydb. | Erigeron formosissimus Greene trib. Astereae |
| Erigeron fuegiae Vierh. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron gaudinii Brügger | Erigeron schleicheri Gremli trib. Astereae |
| Erigeron gayanus J.RĂ©my | Erigeron myosotis Pers. trib. Astereae |
| Erigeron glabellus yukonensis (Rydb.) Hultén | Erigeron yukonensis Rydb. trib. Astereae |
| Erigeron glabrifolius DC. | Symphyotrichum glabrifolium (DC.) G.L.Nesom trib. Astereae |
| Erigeron glandulosus Hegetschw. | Erigeron schleicheri Gremli trib. Astereae |
| Erigeron glandulosus Porter & J.M.Coult. | Erigeron vetensis Rydb. trib. Astereae |
| Erigeron gormanii Greene | Erigeron compositus Pursh trib. Astereae |
| Erigeron gramineus L. | Arctogeron gramineum (L.) DC. trib. Astereae |
| Erigeron graminifolius Pall. ex Herder | Arctogeron gramineum (L.) DC. trib. Astereae |
| Erigeron graminifolius Phil. | Symphyotrichum vahlii (Gaudich.) G.L.Nesom trib. Astereae |
| Erigeron grandiflorus lanatus (Hook.) A.Gray | Erigeron lanatus Hook. trib. Astereae |
| Erigeron grandiflorus muirii (A.Gray) Hultén | Erigeron muirii A.Gray trib. Astereae |
| Erigeron grandiflorus Willd. ex Spreng. | Erigeron caucasicus Steven trib. Astereae |
| Erigeron grayi A.Heller | Erigeron utahensis A.Gray trib. Astereae |
| Erigeron greenei G.L.Nesom | Erigeron reductus (Cronquist) G.L.Nesom trib. Astereae |
| Erigeron gulielmi Greene | Erigeron formosissimus Greene trib. Astereae |
| Erigeron gunnii (Hook.f.) Hook.f. | Pappochroma gunnii (Hook.f.) G.L.Nesom trib. Astereae |
| Erigeron heterochaeta (Benth. ex C.B.Clarke) Botsch. | Aster asteroides (DC.) Kuntze trib. Astereae |
| Erigeron heterotrichus H.Hara | Erigeron alpicola (Makino) Makino trib. Astereae |
| Erigeron hieraciifolius Poir. | Podocoma hieraciifolia (Poir.) Cass. trib. Astereae |
| Erigeron higginsii S.L.Welsh | Erigeron canaani S.L.Welsh trib. Astereae |
| Erigeron hirsutus Pursh | Erigeron pumilus Nutt. trib. Astereae |
| Erigeron hirtuosus Greene | Erigeron formosissimus Greene trib. Astereae |
| Erigeron hispidus Nutt. | Erigeron glaucus Ker Gawl. trib. Astereae |
| Erigeron huberi S.L.Welsh & N.D.Atwood | Erigeron radicatus Hook. trib. Astereae |
| Erigeron humilis Spreng. ex DC. | Erigeron monticolus Wall. ex DC. trib. Astereae |
| Erigeron hybridus Hieron. | Oritrophium peruvianum (Lam.) Cuatrec. trib. Astereae |
| Erigeron hyssopifolis anticostensis Vict. & J.Rousseau | Erigeron hyssopifolius Michx. trib. Astereae |
| Erigeron hyssopifolius villicaulis Fernald | Erigeron hyssopifolius Michx. trib. Astereae |
| Erigeron ibari Phil. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron inornatus reductus Cronquist, Brittonia 6: 288 (1947) | Erigeron reductus (Cronquist) G.L.Nesom trib. Astereae |
| Erigeron iodanthus Greene | Erigeron formosissimus Greene trib. Astereae |
| Erigeron karatavicus Pavl. | Psychrogeton alexeenkoi Krasch. trib. Astereae |
| Erigeron karvinskianus mucronatus (DC.) Hieron. | Erigeron karvinskianus DC. trib. Astereae |
| Erigeron kermanensis Rech.f. | Psychrogeton alexeenkoi Krasch. trib. Astereae |
| Erigeron koelzianus Rech.f. | Psychrogeton cabulicum Boiss. trib. Astereae |
| Erigeron komarovii Botsch. | Erigeron alpicola (Makino) Makino trib. Astereae |
| Erigeron koraginensis Kom. | Erigeron alpicola (Makino) Makino trib. Astereae |
| Erigeron lacarensis Phil. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron laetevirens Rydb. | Erigeron ochroleucus Nutt. trib. Astereae |
| Erigeron lanceolatus lorentzianus Griseb. | Erigeron lanceolatus Wedd. trib. Astereae |
| Erigeron latisquamus Boiss. | Neobrachyactis obovata (Benth.) Farhani & Kaz.Osaloo trib. Astereae |
| Erigeron lehmannii Boiss. | Psychrogeton pseuderigeron (Bunge) Novopokr. ex Nevski trib. Astereae |
| Erigeron lehmannii Hieron. | Oritrophium peruvianum (Lam.) Cuatrec. trib. Astereae |
| Erigeron leucanthemoides Greene | Erigeron coulteri Porter & J.M.Coult. trib. Astereae |
| Erigeron leucophyllus (Bunge) Boiss. | Psychrogeton amorphoglossus (Boiss.) Novopokr. trib. Astereae |
| Erigeron limnophilus Sch.Bip. | Oritrophium limnophilum (Sch.Bip.) Cuatrec. trib. Astereae |
| Erigeron linearis elegantulus (Greene) J.T.Howell | Erigeron elegantulus Greene trib. Astereae |
| Erigeron litoralis (Phil.) Skottsb. | Erigeron fasciculatus Colla trib. Astereae |
| Erigeron loxensis Hieron. | Oritrophium peruvianum (Lam.) Cuatrec. trib. Astereae |
| Erigeron lucidus Greene | Erigeron coulteri Porter & J.M.Coult. trib. Astereae |
| Erigeron luteus A.Nelson | Erigeron linearis (Hook.) Piper trib. Astereae |
| Erigeron macounii Greene | Erigeron radicatus Hook. trib. Astereae |
| Erigeron maguirei harrisonii S.L.Welsh | Erigeron maguirei Cronquist trib. Astereae |
| Erigeron maritimus Nutt. | Erigeron glaucus Ker Gawl. trib. Astereae |
| Erigeron mexiae K.M.Becker | Erigeron denalii A.Nelson trib. Astereae |
| Erigeron microlonchus Greene | Erigeron eatonii A.Gray trib. Astereae |
| Erigeron minjanensis Rech.f. | Psychrogeton poncinsii (Franch.) Y.Ling & Y.L.Chen. trib. Astereae |
| Erigeron miyagii (Koidz.) Honda | Aster miyagii Koidz. trib. Astereae |
| Erigeron mogollonicus Greene | Erigeron formosissimus Greene trib. Astereae |
| Erigeron mollissimus Rech.f. & Koeie | Psychrogeton amorphoglossus (Boiss.) Novopokr. trib. Astereae |
| Erigeron monocephalus Schur | Erigeron uniflorus L. trib. Astereae |
| Erigeron montanensis Rydb. | Erigeron ochroleucus Nutt. trib. Astereae |
| Erigeron monticola Wall. | Erigeron monticolus Wall. ex DC. trib. Astereae |
| Erigeron morrisonense fukuyamae (Kitam.) Kitam. | Erigeron fukuyamae Kitam. trib. Astereae |
| Erigeron mucronatus DC. | Erigeron karvinskianus DC. trib. Astereae |
| Erigeron multifidus Rydb. | Erigeron compositus Pursh trib. Astereae |
| Erigeron multifolius amplisquamus Y.Ling & Y.L.Chen | Erigeron multifolius Hand.-Mazz. trib. Astereae |
| Erigeron multiradiatus glabrescens Y.Ling & Y.L.Chen | Erigeron multiradiatus (Lindl. ex DC.) Benth. & Hook.f. trib. Astereae |
| Erigeron myosotis elongatum Sch.Bip. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron myosotis skottsbergii Vierh. | Erigeron leptopetalus Phil. trib. Astereae |
| Erigeron myosotoides Juss. ex Pers. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron nanus neglectus (A.Kern.) SoĂł | Erigeron neglectus A.Kern. trib. Astereae |
| Erigeron nanus Schur | Erigeron alpinus L. trib. Astereae |
| Erigeron nevadensis pygmaeus A.Gray, Proc. Amer. Acad. Arts 8: 649 (1873) | Erigeron pygmaeus (A.Gray) Greene trib. Astereae |
| Erigeron nivalis Boiss. | Psychrogeton chionophilus (Boiss.) Krasch. trib. Astereae |
| Erigeron novae-zealandiae Buchanan | Celmisia angustifolia Cockayne trib. Astereae |
| Erigeron nubigenus Phil. | Erigeron leptopetalus Phil. trib. Astereae |
| Erigeron nudiflorus Buckley | Erigeron flagellaris A.Gray trib. Astereae |
| Erigeron nuttallii A.Heller | Erigeron foliosus Nutt. trib. Astereae |
| Erigeron oblanceolatus Rydb. | Erigeron glabellus Nutt. trib. Astereae |
| Erigeron obovatus (Benth.) Boiss. | Neobrachyactis obovata (Benth.) Farhani & Kaz.Osaloo trib. Astereae |
| Erigeron ochroleucus D.C.Eaton | Erigeron eatonii A.Gray trib. Astereae |
| Erigeron ochroleucus hirtellus (DC.) A.Gray | Erigeron chrysopsidis A.Gray trib. Astereae |
| Erigeron ochroleucus scribneri (Canby ex Rydb.) Cronquist | Erigeron ochroleucus Nutt. trib. Astereae |
| Erigeron oharae (Nakai) Botsch. | Aster spathulifolius Maxim. trib. Astereae |
| Erigeron olgae Regel & Schmalh. | Psychrogeton olgae (Regel & Schmalh.) Novopokr. ex Nevski trib. Astereae |
| Erigeron oligocephalus (Schrenk) B.Fedtsch. | Chamaegeron oligocephalum Schrenk trib. Astereae |
| Erigeron pachyrhizus Greene | Erigeron cascadensis A.Heller trib. Astereae |
| Erigeron pacificus Howell | Erigeron eatonii A.Gray trib. Astereae |
| Erigeron paghmaicus Rech.f. | Psychrogeton poncinsii (Franch.) Y.Ling & Y.L.Chen. trib. Astereae |
| Erigeron pappochroma gunnii (Hook.f.) Benth. | Pappochroma gunnii (Hook.f.) G.L.Nesom trib. Astereae |
| Erigeron pappocroma setosus Benth., Fl. Austral. 3 (1867) | Pappochroma setosum (Benth.) G.L.Nesom trib. Astereae |
| Erigeron pecosensis Standl. | Erigeron formosissimus Greene trib. Astereae |
| Erigeron pedatus Greene | Erigeron compositus Pursh trib. Astereae |
| Erigeron pellitus (Kunth) Wedd. | Oritrophium peruvianum (Lam.) Cuatrec. trib. Astereae |
| Erigeron peregrinus dawsonii Greene | Erigeron peregrinus (Pursh) Greene trib. Astereae |
| Erigeron persicus Boss. | Psychrogeton persicus (Boiss.) Grierson trib. Astereae |
| Erigeron peruvianus (Lam.) Cuatrec. | Oritrophium peruvianum (Lam.) Cuatrec. trib. Astereae |
| Erigeron peucephyllus A.Gray | Erigeron linearis (Hook.) Piper trib. Astereae |
| Erigeron philippii Sch.Bip. ex Wedd. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron phoenicodontus S.F.Blake | Erigeron canus A.Gray trib. Astereae |
| Erigeron pinnatisectus insolens J.F.Macbr. & Payson | Erigeron mancus Rydb. trib. Astereae |
| Erigeron pinnatus Turcz. | Erigeron cardaminifolius (Kunth) Wedd. trib. Astereae |
| Erigeron platylepis Vierh. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron pluriflorus Botsch. | Erigeron eriocephalus J.Vahl trib. Astereae |
| Erigeron poeppigii DC. | Erigeron cinereus Hook. & Arn. trib. Astereae |
| Erigeron poliospermus latus A.Nelson & J.F.Macbr., Bot. Gaz. 55: 383 (1913) | Erigeron latus (A.Nelson & J.F.Macbr.) Cronquist trib. Astereae |
| Erigeron polyadenus Rech.f. & Koië | Psychrogeton alexeenkoi Krasch. trib. Astereae |
| Erigeron polymorphus Scop. | Erigeron alpinus L. trib. Astereae |
| Erigeron polyphyllus Phil. | Erigeron myosotis Pers. trib. Astereae |
| Erigeron poncinsii (Franch.) Botsch. | Psychrogeton poncinsii (Franch.) Y.Ling & Y.L.Chen. trib. Astereae |
| Erigeron porteri S.F.Blake | Erigeron vetensis Rydb. trib. Astereae |
| Erigeron pratensis Phil. | Erigeron gilliesii (Hook. & Arn.) Cabrera trib. Astereae |
| Erigeron primulifolius Juss. ex Cass. | Podocoma hieraciifolia (Poir.) Cass. trib. Astereae |
| Erigeron proselyticus G.L.Nesom | Erigeron sionis Cronquist trib. Astereae |
| Erigeron pseuderigeron (Bunge) Popov ex Novopokr. | Psychrogeton pseuderigeron (Bunge) Novopokr. ex Nevski trib. Astereae |
| Erigeron pseudoelongatus Botsch. | Erigeron acris ssp. botschanzevii Greuter trib. Astereae |
| Erigeron pseudoneglectus Popov | Erigeron petiolaris Vierh. trib. Astereae |
| Erigeron pseudoseravschanicus glabrescens Y.Ling & Y.L.Chen | Erigeron pseudoseravschanicus Botsch. trib. Astereae |
| Erigeron pulchellus (Willd.) DC. | Erigeron caucasicus Steven trib. Astereae |
| Erigeron pulchellus Hook. | Erigeron glabellus Nutt. trib. Astereae |
| Erigeron pulchellus Turcz. | Erigeron uniflorus L. trib. Astereae |
| Erigeron pulchellus unalaschkensis DC. | Erigeron humilis Graham trib. Astereae |
| Erigeron pulvinatus Rydb. | Erigeron compactus S.F.Blake trib. Astereae |
| Erigeron pulvinatus Wedd. | Erigeron rosulatus Wedd. trib. Astereae |
| Erigeron pumilus concinnus (Hook. & Arn.) Dorn | Erigeron concinnus (Hook. & Arn.) Torr. & A.Gray trib. Astereae |
| Erigeron pumilus Hook. | Erigeron ochroleucus Nutt. trib. Astereae |
| Erigeron purpuratus dilatatus B.Boivin | Erigeron denalii A.Nelson trib. Astereae |
| Erigeron purpuratus pallens (Cronquist) G.W.Douglas | Erigeron pallens Cronquist trib. Astereae |
| Erigeron pyrenaicus (Pourr.) A.W.Hill | Erigeron uniflorus L. trib. Astereae |
| Erigeron radicosus Spreng. ex DC. | Erigeron multiradiatus (Lindl. ex DC.) Benth. & Hook.f. trib. Astereae |
| Erigeron remyanus Speg. | Erigeron gilliesii (Hook. & Arn.) Cabrera trib. Astereae |
| Erigeron repens (Kunth) Wedd. | Oritrophium repens (Kunth) Cuatrec. trib. Astereae |
| Erigeron repens A.Gray | Erigeron glacialis (Nutt.) A.Nelson trib. Astereae |
| Erigeron rubicundus Greene | Erigeron formosissimus Greene trib. Astereae |
| Erigeron rupestris Popov ex Novopokr. | Aster popovii Botsch. trib. Astereae |
| Erigeron salsuginosus glacialis (Nutt.) A.Gray | Erigeron glacialis (Nutt.) A.Nelson trib. Astereae |
| Erigeron salsuginosus howellii A.Gray, Proc. Amer. Acad. Arts 16: 93 (1880) | Erigeron howellii (A.Gray) A.Gray trib. Astereae |
| Erigeron sanglichensis Rech.f. & Edelb. | Psychrogeton poncinsii (Franch.) Y.Ling & Y.L.Chen. trib. Astereae |
| Erigeron scaberulus Greene | Erigeron formosissimus Greene trib. Astereae |
| Erigeron scorzonerifolius J.RĂ©my | Symphyotrichum glabrifolium (DC.) G.L.Nesom trib. Astereae |
| Erigeron scribneri Canby ex Rydb. | Erigeron ochroleucus Nutt. trib. Astereae |
| Erigeron setosus (Benth.) M.Gray | Pappochroma setosum (Benth.) G.L.Nesom trib. Astereae |
| Erigeron setulosus Greene | Erigeron concinnus (Hook. & Arn.) Torr. & A.Gray trib. Astereae |
| Erigeron shahvaricus Rech.f. | Psychrogeton amorphoglossus (Boiss.) Novopokr. trib. Astereae |
| Erigeron simplex Greene | Erigeron grandiflorus Hook. trib. Astereae |
| Erigeron smithii Rydb. | Erigeron formosissimus Greene trib. Astereae |
| Erigeron sodiroi Hieron. ex Sod. | Oritrophium limnophilum (Sch.Bip.) Cuatrec. trib. Astereae |
| Erigeron spathulifolius (Maxim.) H.S.Pak | Aster spathulifolius Maxim. trib. Astereae |
| Erigeron spatulifolius Howell | Erigeron cascadensis A.Heller trib. Astereae |
| Erigeron squarrosus Lindl. | Erigeron glaucus Ker Gawl. trib. Astereae |
| Erigeron stapfianus Rech.f. | Psychrogeton amorphoglossus (Boiss.) Novopokr. trib. Astereae |
| Erigeron stenophyllus A.Gray | Erigeron utahensis A.Gray trib. Astereae |
| Erigeron stenophyllus D.C.Eaton | Erigeron arenarioides (D.C.Eaton ex A.Gray) Rydb. trib. Astereae |
| Erigeron stenophyllus Nutt. | Erigeron foliosus Nutt. trib. Astereae |
| Erigeron stocksianus Boiss. | Chamaegeron oligocephalum Schrenk trib. Astereae |
| Erigeron striatus Greene | Erigeron foliosus Nutt. trib. Astereae |
| Erigeron stuebelii Hieron. | Oritrophium peruvianum (Lam.) Cuatrec. trib. Astereae |
| Erigeron subandinus Phil. | Erigeron fasciculatus Colla trib. Astereae |
| Erigeron subasper Greene | Erigeron formosissimus Greene trib. Astereae |
| Erigeron sulcatus Nees | Erigeron pumilus Nutt. trib. Astereae |
| Erigeron sullivanii Hook.f. | Erigeron incertus (d'Urv.) Skottsb. trib. Astereae |
| Erigeron tener M.E.Jones | Erigeron eatonii A.Gray trib. Astereae |
| Erigeron tenuicaulis Y.Ling & Y.L.Chen | Erigeron pseudotenuicaulis Brouillet & Y.L.Chen trib. Astereae |
| Erigeron tenuissimus Greene | Erigeron foliosus Nutt. trib. Astereae |
| Erigeron tetrapleuris (A.Gray) A.Heller | Erigeron utahensis A.Gray trib. Astereae |
| Erigeron thunbergii albiflorus Y.N.Lee | Erigeron thunbergii A.Gray trib. Astereae |
| Erigeron thunbergii glabratus A.Gray | Erigeron alpicola (Makino) Makino trib. Astereae |
| Erigeron tricuneatus L.f. | Baccharis tricuneata (L.f.) Pers. trib. Astereae |
| Erigeron trilobus Sond. | Erigeron karvinskianus DC. trib. Astereae |
| Erigeron turczaninowii Wedd. | Erigeron cardaminifolius (Kunth) Wedd. trib. Astereae |
| Erigeron turkestanicus (Regel & Schmalh.) O.Fedtsch. | Psychrogeton cabulicum Boiss. trib. Astereae |
| Erigeron turkestanicus Vierh. | Erigeron lachnocephalus Botsch. trib. Astereae |
| Erigeron tweedyanus Canby & Rose | Erigeron ochroleucus Nutt. trib. Astereae |
| Erigeron unalaschkensis (DC.) Vierh. | Erigeron humilis Graham trib. Astereae |
| Erigeron unalaschkensis eriocephalus (J.Vahl) A.E.Porsild | Erigeron eriocephalus J.Vahl trib. Astereae |
| Erigeron uniflorus elborsensis (Boiss.) Rech.f. | Erigeron elborsensis Boiss. trib. Astereae |
| Erigeron uniflorus eriocalyx (Ledeb.) �.Löve & D. Löve | Erigeron eriocalyx (Ledeb.) Vierh. trib. Astereae |
| Erigeron uniflorus eriocephalus (J.Vahl) B.Boivin | Erigeron eriocephalus J.Vahl trib. Astereae |
| Erigeron uniflorus frigidus (Boiss. ex DC.) Arcang. | Erigeron frigidus Boiss. ex DC. trib. Astereae |
| Erigeron uniflorus melanocephalus A.Nelson, Wyoming Agric. Exp. Sta. Bull. 28: 131 (1896) | Erigeron melanocephalus (A.Nelson) A.Nelson trib. Astereae |
| Erigeron uniflorus oreades Schrenk, Enum. Pl. Nov. [Fischer & C.A. Meyer] 2: 39 (1842) | Erigeron oreades (Schrenk) Fisch. & C.A.Mey. trib. Astereae |
| Erigeron uniflorus unalaschkensis (DC.) B.Boivin | Erigeron humilis Graham trib. Astereae |
| Erigeron ursinus gracilis (Rydb.) A.Nelson | Erigeron gracilis Rydb. trib. Astereae |
| Erigeron ursinus meyerae S.L.Welsh | Erigeron ursinus D.C.Eaton trib. Astereae |
| Erigeron utahensis tetrapleuris (A.Gray) Cronquist | Erigeron utahensis A.Gray trib. Astereae |
| Erigeron vahlii Gaudich. | Symphyotrichum vahlii (Gaudich.) G.L.Nesom trib. Astereae |
| Erigeron vidalii Phil. | Erigeron othonnifolius Hook. & Arn. trib. Astereae |
| Erigeron villosus (L.) Steud. | Galatella villosa (L.) Rchb.f. trib. Astereae |
| Erigeron viscidulus Greene | Erigeron petrophilus Greene trib. Astereae |
| Erigeron wahwahensis S.L.Welsh | Erigeron jonesii Cronquist trib. Astereae |
| Erigeron wyomingius Rydb. | Erigeron pulcherrimus A.Heller trib. Astereae |
| Erigeron yakimensis A.Nelson | Erigeron linearis (Hook.) Piper trib. Astereae |
| Erigeron zerdanus Boiss. | Psychrogeton amorphoglossus (Boiss.) Novopokr. trib. Astereae |