| Asteraceae | |
Petasites alaskanus
| Rydb. | N. Amer. Fl. 34(4): 314 | 1927 |
| Asteraceae | * |
Petasites albus
| A. Gray | Perry Exped. 2: 314 | 1857 |
| Asteraceae | |
Petasites albus
| (L.) Gaertn. | Fruct. Sem. Pl. 2: 406, pl. 166 | 1791 |
| Asteraceae | |
Petasites amplus
| Kitam. | Acta Phytotax. Geobot. 1(2): 115 | 1932 |
| Asteraceae | |
Petasites arcticus
| A.E. Porsild | Sargentia 4: 74 | 1943 |
| Asteraceae | |
Petasites corymbosus
| (R. Br.) Rydb. | Bull. Torrey Bot. Club 37(9): 460 | 1910 |
| Asteraceae | |
Petasites dentatus
| Blank. | Sci. Stud. Montana Coll. Agric., Bot. 1(2): 102 | 1905 |
| Asteraceae | |
Petasites fominii
| Bordz. | Zap. Kievsk. Obshch. Estestvoisp. 25: 123 | 1915 |
| Asteraceae | ! |
Petasites formosanus
| Kitam. | Acta Phytotax. Geobot. 2: 177 | 1933 |
| Asteraceae | |
Petasites fragrans
| (Vill.) C. Presl | Fl. Sicul. (Presl) 1: xxvii | 1826 |
| Asteraceae | |
Petasites frigidus
| (L.) Fr. | Summa Veg. Scand. 182 | 1845 |
| Asteraceae | |
Petasites georgicus
| Manden. | Zametki Sist. Geogr. Rast. 13: 73 | 1947 |
| Asteraceae | |
Petasites giganteus
| F. Schmidt ex Maxim. | Reis. Amur. Sach. 17: 212 | 1866 |
| Asteraceae | |
Petasites giganteus
| Fuss | Fl. Transsilv. 310 | 1866 |
| Asteraceae | |
Petasites glabratus
| (Maly) Borbás | Term. Kozl. 34, Potfuz: 124 | 1895 |
| Asteraceae | |
Petasites glacialis
| (Ledeb.) Polunin | Rhodora 53(633): 228 | 1951 |
| Asteraceae | |
Petasites gmelinii
| (Turcz. ex DC.) Polunin | Rhodora 53(633): 228 | 1951 |
| Asteraceae | |
Petasites gracilis
| Britton | Bull. New York Bot. Gard. 2(6): 186 | 1901 |
| Asteraceae | |
Petasites himalaicus
| Kitam. | Acta Phytotax. Geobot. 15: 108 | 1954 |
| Asteraceae | |
Petasites hookerianus
| (Nutt.) Rydb. | N. Amer. Fl. 34(4): 314 | 1927 |
| Asteraceae | |
Petasites hybridus
| (L.) G. Gaertn., B. Mey. & Scherb. | Oekon. Fl. Wetterau 3(2): 184 | 1802 |
| Asteraceae | |
Petasites hyperboreus
| Rydb. | N. Amer. Fl. 34(4): 312–313 | 1927 |
| Asteraceae | |
Petasites japonicus
| (Siebold & Zucc.) F. Schmidt | Reis. Amur-Land., Bot. 145 | 1868 |
| Asteraceae | ! |
Petasites japonicus
| (Siebold & Zucc.) Maxim. | Award 34th Demidov. Prize 212 | 1866 |
| Asteraceae | |
Petasites kablikianus
| Tausch | Icon. Fl. Germ. Helv. 15: 4, pl. 900 | |
| Asteraceae | |
Petasites kamengicus
| Deb | Indian Forester 93(4): 255, f. 1 | 1967 |
| Asteraceae | |
Petasites laevigatus
| (Willd.) Rchb. | Fl. Germ. Excurs. 279 | 1831 |
| Asteraceae | |
Petasites liukiuensis
| Kitam. | Acta Phytotax. Geobot. 2: 178 | 1930 |
| Asteraceae | |
Petasites mairei
| H. Lév. | Bull. Géogr. Bot. 25: 15 | 1915 |
| Asteraceae | |
Petasites nivalis
| Greene | Pittonia 2(7B): 18–19 | 1889 |
| Asteraceae | |
Petasites niveus
| (Vill.) Baumg. | Enum. Stirp. Transsilv. 3: 94 | 1817 |
| Asteraceae | |
Petasites officinalis
| Moench | Methodus 568 | 1794 |
| Asteraceae | |
Petasites palmatus
| (Aiton) A. Gray | Bot. California 1: 407 | 1876 |
| Asteraceae | |
Petasites paradoxus
| (Retz.) Baumg. | Enum. Stirp. Transsilv. 3: 94 | 1817 |
| Asteraceae | |
Petasites petelotii
| (Merr.) Kitam. | Acta Phytotax. Geobot. 22: 130 | 1966 |
| Asteraceae | |
Petasites pyrenaicus
| (L.) G. López | Anales Jard. Bot. Madrid 42(2): 323 | 1986 |
| Asteraceae | |
Petasites radiatus
| (J.F. Gmel.) J. Toman | Folia Geobot. Phytotax. 7(4): 388 | 1972 |
| Asteraceae | ! |
Petasites rubellus
| (J.F. Gmel.) Toman | Folia Geobot. Phytotax. 7: 391 | 1972 |
| Asteraceae | |
Petasites × sachalinensis
| Toman. | Čas. Nár. Mus., Odd. Prír. 134(3): 121 | 1965 |
| Asteraceae | |
Petasites sagittatus
| (Pursh) A. Gray | Bot. California 1: 407 | 1876 |
| Asteraceae | |
Petasites saxatilis
| (Turcz.) Kom. | Trudy Imp. S.-Peterburgsk. Bot. Sada 25: 684 | 1907 |
| Asteraceae | |
Petasites sibiricus
| (J.F. Gmel.) Dingwall | Bot. J. Linn. Soc. 71(4): 273 | 1975 [1976] |
| Asteraceae | |
Petasites speciosus
| (Nutt.) Piper | Mazama 2(2): 97 | 1901 |
| Asteraceae | |
Petasites spurius
| Miq. | Ann. Mus. Bot. Lugduno-Batavi 2: 168 | 1866 |
| Asteraceae | |
Petasites spurius
| (Retz.) Rchb. | Icon. Fl. Germ. Helv. 16: 3, pl. 896 | 1853-1854 |
| Asteraceae | ! |
Petasites tatewakianus
| Kitam. | Acta Phytotax. Geobot. 9: 64 | 1940 |
| Asteraceae | |
Petasites tricholobus
| Franch. | Nouv. Arch. Mus. Hist. Nat., sér. 2 6: 52 | 1883 |
| Asteraceae | |
Petasites trigonophyllus
| Greene | Leafl. Bot. Observ. Crit. 1(13): 180 | 1906 |
| Asteraceae | |
Petasites vanioti
| H. Lév. | Bull. Géogr. Bot. 25: 15 | 1915 |
| Asteraceae | ! |
Petasites versipilus
| Hand.-Mazz. | Anz. Akad. Wiss. Wien, Math.-Naturwiss. Kl. 68: 289 | 1920 |
| Asteraceae | |
Petasites × vitifolius
| Greene | Leafl. Bot. Observ. Crit. 1: 180 | 1906 |
| Asteraceae | |
Petasites vitifolius
| Greene | Leafl. Bot. Observ. Crit. 1(13): 180 | 1906 |
| Asteraceae | |
Petasites vulgaris
| Desf. | Fl. Atlant. 2: 270 | 1800 |
| Asteraceae | |
Petasites warrenii
| H. St. John | Res. Stud. State Coll. Wash. 1(2): 109–112, f. 2 | 1929 |