| Asteraceae | |
Senecio abadianus
| DC. | Prodr. 6: 423 | 1837 [1838] |
| Asteraceae | |
Senecio abbreviatus
| S. Moore | J. Bot. 56: 8 | 1918 |
| Asteraceae | |
Senecio aberdaricus
| R.E. Fr. & T.C.E. Fr. | Svensk Bot. Tidskr. 16: 331 | 1922 |
| Asteraceae | |
Senecio aberrans
| Greenm. | Ann. Missouri Bot. Gard. 10: 73, t. 3 | 1923 |
| Asteraceae | |
Senecio abietinus
| Willd. ex Wedd. | Chlor. Andina 1(3): 101 | 1855 [1856] |
| Asteraceae | |
Senecio abrotanifolius
| L. | Sp. Pl. 2: 869 | 1763 |
| Asteraceae | |
Senecio abrotanoides
| E. Mey. | Prodr. 6: 397 | 1837 [1838] |
| Asteraceae | |
Senecio abruptus
| Thunb. | Prodr. Pl. Cap. 159 | 1800 |
| Asteraceae | |
Senecio abyssinicus
| Sch. Bip. ex A. Rich. | Tent. Fl. Abyss. 1: 438 | 1848 |
| Asteraceae | * |
Senecio acanthifolius
| Hombr. & Jacquinot ex Decne. | Voy. Pôle Sud, Bot. , t. 11 | 1845 |
| Asteraceae | |
Senecio acanthifolius
| (Rchb.) Kostel. | Allg. Med.-Pharm. Fl. 2: 714 | 1833 |
| Asteraceae | |
Senecio acarinus
| Cabrera | Notas Mus. La Plata, Bot. 18(89): 210 | 1955 |
| Asteraceae | * |
Senecio acaulis
| Phil. | Anales Univ. Chile 1861: 52 | 1861 |
| Asteraceae | |
Senecio acaulis
| Sch. Bip. | Anales Univ. Chile 18: 52 | 1861 |
| Asteraceae | |
Senecio accedens
| Greene | Pittonia 3(15): 105 | 1896 |
| Asteraceae | * |
Senecio acerifolius
| C. Winkl. | Trudy Imp. S.-Peterburgsk. Bot. Sada 13(1): 9–10 | 1893 |
| Asteraceae | * |
Senecio acerifolius
| Hemsl. | Biol. Cent.-Amer., Bot. 2(10): 235 | 1881 |
| Asteraceae | ! |
Senecio acerifolius
| K. Koch | Wochenschr. Vereines Beförd. Gartenbaues Königl. Preuss. Staaten 4(30): 237 | 1861 |
| Asteraceae | * |
Senecio acerifolius
| Klatt | Ann. K. K. Naturhist. Hofmus. 9: 363 | 1894 |
| Asteraceae | |
Senecio acervatus
| S. Moore | J. Linn. Soc., Bot. 40: 121 | 1911 |
| Asteraceae | |
Senecio acetosaefolius
| Baker | J. Linn. Soc., Bot. 22: 496 | 1886 |
| Asteraceae | |
Senecio achalensis
| Cabrera | Notas Mus. La Plata, Bot. 1: 92, f.1 | 1935 |
| Asteraceae | |
Senecio achilleifolius
| DC. | Prodr. 6: 396 | 1837 [1838] |
| Asteraceae | |
Senecio achyrotrichus
| Diels | Bot. Jahrb. Syst. 36(5, Beibl. 82): 105–106 | 1905 |
| Asteraceae | |
Senecio aciculatus
| Cuatrec. | Trab. Comis. Bot. Secr. Agric. Fomento Esc. Super. Agric. Trop. 6: 24, f. 19 | 1944 |
| Asteraceae | |
Senecio aclonetus
| Phil. | Anales Univ. Chile 88: 256 | 1894 |
| Asteraceae | |
Senecio aclydiphyllus
| Cuatrec. | Proc. Biol. Soc. Washington 77: 149–151, f. 8 | 1964 |
| Asteraceae | |
Senecio aconitifolius
| (Bunge) Turcz. | Bull. Soc. Imp. Naturalistes Moscou 10(7): 155 | 1837 |
| Asteraceae | |
Senecio acromaculatus
| Y. Ling | Contr. Inst. Bot. Natl. Acad. Peiping 5: 18, pl. 4, f. 3 | 1937 |
| Asteraceae | |
Senecio actinella
| Greene | Bull. Torrey Bot. Club 10(8): 87 | 1883 |
| Asteraceae | ! |
Senecio actinotus
| Hand.-Mazz. | Symb. Sin. 7(4): 1121, pl. 31, f. 3 | 1936 |
| Asteraceae | |
Senecio acuminatissimus
| Cabrera | Notas Mus. La Plata, Bot. 18(89): 233, f. 12 | 1955 |
| Asteraceae | |
Senecio acuminatus
| Wall. ex DC. | Prodr. 6: 368 | 1837 [1838] |
| Asteraceae | |
Senecio acutangulus
| (Bertol.) Hemsl. | Biol. Cent.-Amer., Bot. 2(10): 235 | 1881 |
| Asteraceae | |
Senecio acutidens
| Rydb. | Bull. Torrey Bot. Club 27(4): 180, pl. 5, f. 2 | 1900 |
| Asteraceae | |
Senecio acutidentatus
| A. Rich. | Tent. Fl. Abyss. 1: 436 | 1848 |
| Asteraceae | |
Senecio acutifolius
| DC. | Prodr. 6: 402 | 1837 [1838] |
| Asteraceae | ! |
Senecio acutipinnus
| Hand.-Mazz. | Symb. Sin. 7(4): 1127, pl. 18, f. 3–4 | 1936 |
| Asteraceae | |
Senecio adamantinus
| Bong. | Bull. Sci. Acad. Imp. Sci. Saint-Pétersbourg 5: 97 | 1838 |
| Asteraceae | |
Senecio adamsii
| Cheeseman | Trans. & Proc. New Zealand Inst. 28: 536 | 1896 |
| Asteraceae | * |
Senecio adamsii
| Howell | Fl. N.W. Amer. 3: 379 | 1900 |
| Asteraceae | |
Senecio addoensis
| Compton | J. Bot. 72: 48 | 1934 |
| Asteraceae | |
Senecio adenocalyx
| Dinter | Repert. Spec. Nov. Regni Veg. 30: 96 | 1932 |
| Asteraceae | |
Senecio adenodontus
| DC. | Prodr. 6: 378 | 1837 [1838] |
| Asteraceae | |
Senecio adenolepis
| Greenm. | Publ. Field Columb. Mus., Bot. Ser. 2(6): 281–282 | 1907 |
| Asteraceae | |
Senecio adenophylloides
| Sch. Bip. | Bonplandia (Hannover) 4: 52, 55 | 1856 |
| Asteraceae | |
Senecio adenophyllus
| Meyen & Walp. | Nov. Actorum Acad. Caes. Leop.-Carol. Nat. Cur. 19(Suppl. 1): 282 | 1843 |
| Asteraceae | |
Senecio adenostylifolius
| Humbert | Notul. Syst. (Paris) 15(4): 368–369 | 1959 |
| Asteraceae | |
Senecio adenostyloides
| Franch. & Sav. ex Maxim. | Mel. Biol. 9: 297 | 1874 |
| Asteraceae | ! |
Senecio adenotrichius
| DC. | Prodr. 6: 416 | 1837 [1838] |
| Asteraceae | |
Senecio adglacialis
| Cuatrec. | Fieldiana, Bot. 27: 20 | 1951 |
| Asteraceae | |
Senecio admirabilis
| Greene | Erythea 3(2): 23 | 1895 |
| Asteraceae | |
Senecio adnatus
| DC. | Prodr. 6: 388 | 1837 [1838] |
| Asteraceae | |
Senecio adnivalis
| Stapf | J. Linn. Soc., Bot. 37: 521 | 1906 |
| Asteraceae | |
Senecio adolfi-friedericii
| Muschl. | Wiss. Ergebn. Deut. Zentr.-Afr. Exped., Bot. 2: 385 | 1911 |
| Asteraceae | |
Senecio adonidifolius
| Loisel. | Fl. Gall. 566 | 1807 |
| Asteraceae | |
Senecio adrianicus
| Cabrera | Revista Fac. Ci. Agrar. Univ. Nac. Cuyo 13: 8 | 1966 [1967] |
| Asteraceae | * |
Senecio adscendens
| DC. | Prodr. 6: 423–424 | 1837 [1838] |
| Asteraceae | |
Senecio adscendens
| Bojer ex DC. | Prodr. 6: 378 | 1837 [1838] |
| Asteraceae | |
Senecio adustus
| S. Moore | J. Bot. 56: 228 | 1918 |
| Asteraceae | |
Senecio aegyptius
| L. | Sp. Pl. 2: 867 | 1753 |
| Asteraceae | |
Senecio aequinoctialis
| R.E. Fr. | Acta Horti Berg. 9: 152 | 1928 |
| Asteraceae | |
Senecio aetfatensis
| B. Nord. | Novon 9(2): 245–247, f. 1 | 1999 |
| Asteraceae | |
Senecio aethnensis
| Jan ex DC. | Prodr. 6: 345 | 1838 [1837] |
| Asteraceae | |
Senecio affinis
| DC. | Prodr. 6: 385 | 1837 [1838] |
| Asteraceae | |
Senecio afromontanus
| (R.E. Fr.) Humb. & Staner | Bull. Jard. Bot. État Bruxelles 14: 104 | 1936 |
| Asteraceae | |
Senecio agapatensis
| Sch. Bip. | Bonplandia (Hannover) 4: 52, 55 | 1856 |
| Asteraceae | |
Senecio agnostis
| Klatt | Ann. Naturhist. Hofmus. Wien 9: 364 | 1894 |
| Asteraceae | |
Senecio ahrendsii
| Phil. | Anales Univ. Chile 88: 267 | 1894 |
| Asteraceae | |
Senecio ainsliiflorus
| Franch. | J. Bot. (Morot) 8(21–22): 361 | 1894 |
| Asteraceae | |
Senecio aizoides
| (DC.) Sch. Bip. | Flora 28: 499 | 1845 |
| Asteraceae | |
Senecio alabamensis
| Britton ex Small | Fl. S.E. U.S. 1305 | 1903 |
| Asteraceae | |
Senecio alaskanus
| Hultén | Fl. Alaska Yukon 10: 1602–1603, f. 5 e–f | 1950 |
| Asteraceae | |
Senecio alatipes
| Greenm. | Ann. Missouri Bot. Gard. 1(3): 270–271 | 1914 |
| Asteraceae | |
Senecio alatopetiolatus
| J. Calvo, E. Freire & Sklenář | Phytotaxa 243(2): 177, f. 1 | 2016 |
| Asteraceae | |
Senecio alatus
| Sessé & Moc. | Pl. Nov. Hisp. 140 | 1887 [1890] |
| Asteraceae | |
Senecio alatus
| Wall. ex DC. | Prodr. 6: 368 | 1837 [1838] |
| Asteraceae | |
Senecio albanensis
| DC. | Prodr. 6: 385 | 1837 [1838] |
| Asteraceae | |
Senecio albaniae
| H. Beltrán | Novon 12(1): 35–37, f. 1 | 2002 |
| Asteraceae | |
Senecio albanopsis
| Hilliard | Notes Roy. Bot. Gard. Edinburgh 34(1): 86 | 1975 |
| Asteraceae | |
Senecio albens
| Sch. Bip. | Linnaea 34: 531 | 1865 |
| Asteraceae | |
Senecio alberti-smithii
| Cuatrec. | Fieldiana, Bot. 27(2): 21 | 1951 |
| Asteraceae | |
Senecio albescens
| De Wild. | Pl. Bequaert. 5: 140 | 1929 |
| Asteraceae | |
Senecio albicaulis
| Hook. & Arn. | J. Bot. (Hooker) 3: 344 | 1841 |
| Asteraceae | * |
Senecio albiflorus
| Phil. | Anales Mus. Nac. Santiago de Chile 8: 43 | 1891 |
| Asteraceae | ! |
Senecio albiflorus
| Sch. Bip. | Flora 28(32): 498 | 1845 |
| Asteraceae | |
Senecio albifolius
| DC. | Prodr. 6: 389 | 1837 [1838] |
| Asteraceae | |
Senecio albirameus
| Cuatrec. | Bol. Soc. Venez. Ci. Nat. 21(97): 302–303 | 1960 |
| Asteraceae | |
Senecio albolanatus
| Phil. | Anales Univ. Chile 36: 181 | 1870 |
| Asteraceae | |
Senecio albo-lutescens
| Sch. Bip. | Flora 28: 498 | 1845 |
| Asteraceae | |
Senecio albonervius
| Greenm. | Ann. Missouri Bot. Gard. 1(3): 275 | 1914 |
| Asteraceae | |
Senecio albo-punctatus
| Bolus | J. Linn. Soc., Bot. xxii: 177 | 1887 |
| Asteraceae | |
Senecio albopurpureus
| Kitam. | Fauna Fl. Nepal Himalaya 1: 271 | 1955 |
| Asteraceae | |
Senecio albotectus
| Cuatrec. | Feddes Repert. Spec. Nov. Regni Veg. 55(2–3): 130 | 1953 |
| Asteraceae | |
Senecio albus
| J.N. Nakaj. & A.M. Teles | Kew Bull. 64(1): 162–165, 161, f. 1, map | 2009 |
| Asteraceae | |
Senecio alcicornis
| Hook. & Arn. | J. Bot. (Hooker) 3: 334 | 1841 |
| Asteraceae | |
Senecio alfalfalis
| Phil. | Anales Univ. Chile 8: 270 | 1894 |
| Asteraceae | |
Senecio algens
| Wedd. | Chlor. Andina 1(3): 104 | 1855 [1856] |
| Asteraceae | |
Senecio alienus
| B.L. Rob. & Seaton | Proc. Amer. Acad. Arts 28: 110 | 1893 |
| Asteraceae | |
Senecio allapajanus
| Cuatrec. | Brittonia 8: 186 | 1956 |