| Asteraceae | |
Silphium albiflorum
| A. Gray | Proc. Amer. Acad. Arts 19: 4 | 1884 [1883] |
| Asteraceae | |
Silphium alternifolium
| All. | Auct. Syn. 17 | 1773 |
| Asteraceae | |
Silphium arborescens
| Mill. | Gard. Dict. (ed. 8) Silphium no. 4 | 1768 |
| Asteraceae | |
Silphium asperrimum
| Hook. | Companion Bot. Mag. 1(4): 99 | 1835 |
| Asteraceae | |
Silphium asteriscus
| L. | Sp. Pl. 2: 920 | 1753 |
| Asteraceae | |
Silphium atropurpureum
| Retz. ex Willd. | Sp. Pl. 3(3): 2334 | 1803 |
| Asteraceae | |
Silphium betonicifolium
| Hook. | Companion Bot. Mag. 1(4): 99 | 1835 |
| Asteraceae | |
Silphium brachiatum
| Gatt. | Bot. Gaz. 9(12): 192 | 1884 |
| Asteraceae | |
Silphium collinum
| Greene | Pittonia 4(20E): 44 | 1899 |
| Asteraceae | |
Silphium compositum
| Michx. | Fl. Bor.-Amer. 2: 145 | 1803 |
| Asteraceae | |
Silphium confertifolium
| Small | Fl. S.E. U.S. 1243, 1340 | 1903 |
| Asteraceae | |
Silphium connatum
| L. | Mant. Pl. 2: 574 | 1771 |
| Asteraceae | |
Silphium dentatum
| Elliott | Sketch Bot. S. Carolina 2(5): 468–469 | 1824 [1823] |
| Asteraceae | |
Silphium elliottii
| Small | Fl. S.E. U.S. 1243, 1340 | 1903 |
| Asteraceae | * |
Silphium equatoriale
| Spruce | Gen. Pl. 2(1): 350 | 1873 |
| Asteraceae | |
Silphium gatesii
| C. Mohr | Contr. U.S. Natl. Herb. 6: 793, pl. 13 | 1901 |
| Asteraceae | |
Silphium glabrum
| Eggert | Fl. S.E. U.S. 1243, 1340 | 1903 |
| Asteraceae | |
Silphium glutinosum
| J.R. Allison | Castanea 66(1–2): 183–188, f. 11, 12A–C | 2001 |
| Asteraceae | |
Silphium gracile
| A. Gray | Proc. Amer. Acad. Arts 8: 653–654 | 1873 |
| Asteraceae | |
Silphium helianthoides
| L. | Sp. Pl. 2: 920 | 1753 |
| Asteraceae | |
Silphium incisum
| Greene | Pittonia 4(20E): 45 | 1899 |
| Asteraceae | |
Silphium integrifolium
| Michx. | Fl. Bor.-Amer. 2: 146 | 1803 |
| Asteraceae | |
Silphium laciniatum
| L. | Sp. Pl. 2: 919–920 | 1753 |
| Asteraceae | |
Silphium laeve
| Hook. | London J. Bot. 6: 244 | 1847 |
| Asteraceae | |
Silphium laevigatum
| Pursh | Fl. Amer. Sept. 2: 578 | 1814 [1813] |
| Asteraceae | |
Silphium lanceolatum
| Nutt. | Trans. Amer. Philos. Soc., n.s. 7: 341–342 | 1840 |
| Asteraceae | |
Silphium lapsuum
| Small | Man. S.E. Fl. 1411 | 1933 |
| Asteraceae | |
Silphium mohrii
| Small | Bull. Torrey Bot. Club 24(11): 493–494, pl. 315 | 1897 |
| Asteraceae | |
Silphium nodum
| Small | Man. S.E. Fl. 1413 | 1933 |
| Asteraceae | ** |
Silphium nuttallianum
| Torr. | Ann. Lyceum Nat. Hist. New York 2: 216 | 1827 |
| Asteraceae | |
Silphium orae
| Small | Man. S.E. Fl. 1411 | 1933 |
| Asteraceae | |
Silphium ovatifolium
| (Torr. & A. Gray) Small | Fl. S.E. U.S. 1340 | 1903 |
| Asteraceae | |
Silphium perfoliatum
| L. | Syst. Nat. (ed. 10) 2: 1232 | 1759 |
| Asteraceae | |
Silphium peristenium
| Raf. | Atlantic J. 1(4): 146 | 1832 |
| Asteraceae | |
Silphium perplexum
| J.R. Allison | Castanea 66(1–2): 188–189, f. 12D–F | 2001 |
| Asteraceae | |
Silphium pinnatifidum
| Elliott | Sketch Bot. S. Carolina 2(5): 462 | 1824 [1823] |
| Asteraceae | |
Silphium pumilum
| Michx. | Fl. Bor.-Amer. 2: 146 | 1803 |
| Asteraceae | |
Silphium radula
| Nutt. | Trans. Amer. Philos. Soc., n.s. 7: 341 | 1840 |
| Asteraceae | |
Silphium reniforme
| Raf. ex Nutt. | Trans. Amer. Philos. Soc., n.s. 7: 342 | 1840 |
| Asteraceae | |
Silphium reverchonii
| Bush | Rep. (Annual) Missouri Bot. Gard. 17: 125 | 1906 |
| Asteraceae | |
Silphium rumicifolium
| Small | Bull. Torrey Bot. Club 25(3): 145–146 | 1898 |
| Asteraceae | |
Silphium scaberrimum
| Elliott | Sketch Bot. S. Carolina 2(5): 466 | 1823 |
| Asteraceae | |
Silphium scabrum
| Walter | Fl. Carol. 217 | 1781 |
| Asteraceae | |
Silphium simpsonii
| Greene | Pittonia 4(20E): 44 | 1899 |
| Asteraceae | |
Silphium solidaginoides
| L. | Sp. Pl. 2: 920 | 1753 |
| Asteraceae | |
Silphium speciosum
| Nutt. | Trans. Amer. Philos. Soc., n.s. 7: 341 | 1840 |
| Asteraceae | |
Silphium subacaule
| Nutt. | Amer. J. Sci. Arts 5(2): 301 | 1822 |
| Asteraceae | |
Silphium terebinthinaceum
| Jacq. | Hort. Bot. Vindob. 1: 16, pl. 43 | 1770 |
| Asteraceae | * |
Silphium ternatum
| Sessé & Moc. | Fl. Mexic. (ed. 2) 195 | 1894 |
| Asteraceae | ! |
Silphium ternatum
| Willd. | Sp. Pl. 3(3): 2333 | 1803 |
| Asteraceae | |
Silphium ternifolium
| Michx. | Fl. Bor.-Amer. 2: 146 | 1803 |
| Asteraceae | |
Silphium tomentosum
| Pursh | Fl. Amer. Sept. 2: 579 | 1814 [1813] |
| Asteraceae | |
Silphium trifoliatum
| L. | Sp. Pl. 2: 920 | 1753 |
| Asteraceae | |
Silphium trilobatum
| L. | Syst. Nat. (ed. 10) 2: 1233 | 1759 |
| Asteraceae | |
Silphium venosum
| Small | Bull. Torrey Bot. Club 25(9): 478 | 1898 |
| Asteraceae | |
Silphium wasiotense
| Medley | Sida 13(3): 285–291, f. 1, 2e–h, 3 | 1989 |