Silphium compositum subsp. ovatifolium
| Silphium compositum Michaux, subsp. ovatifolium (Torrey & A. Gray) C. R. Sweeney & T. R. Fisher, in C. R. Sweeney, Ohio J. Sci. 70: 232. 1970. | BASIONYM: Silphium compositum Michaux, var. ovatifolium Torrey & A. Gray 1842. | |
Silphium compositum subsp. venosum
| Silphium compositum Michaux, subsp. venosum (Small) C. R. Sweeney & T. R. Fisher, in C. R. Sweeney, Ohio J. Sci. 70: 232. 1970. | BASIONYM: Silphium venosum Small 1898. | |
Silphium compositum var. michauxii
| Silphium compositum Michaux, var. michauxii Torrey & A. Gray, Fl. N. Amer. 2: 276. 1842, nom. inadmiss. | BASIONYM: Silphium compositum Michaux 1803. | |
Silphium compositum var. ovatifolium
| Silphium compositum Michaux, var. ovatifolium Torrey & A. Gray, Fl. N. Amer. 2: 277. 1842. | | TYPE: FLORIDA: Without data, Chapman s.n. (holotype: NY). |
Silphium compositum var. venosum
| Silphium compositum Michaux, var. venosum (Small) Kartesz & Gandhi, Phytologia 71: 272. 1991. | BASIONYM: Silphium venosum Small 1898. | |
Silphium ovatifolium
| Silphium ovatifolium (Torrey & A. Gray) Small, Fl. S.E. U.S. 1242, 1340. 1903. | BASIONYM: Silphium compositum Michaux, var. ovatifolium Torrey & A. Gray 1842. | |
Silphium venosum
| Silphium venosum Small, Bull. Torrey Bot. Club 25: 478. 1898. | | TYPE: GEORGIA: Charlton Co.: St. Marys River swamp, below Traders Hill, 12-15 Jun 1895, Small s.n. (holotype: NY; isotype: F). |
Silphium collinum
| Silphium collinum Greene, Pittonia 4: 44. 1899. | | TYPE: TENNESSEE: |
Silphium compositum forma orae
| Silphium compositum Michaux, forma aroae (Small) L. M. Perry, Rhodora 39: 295. 1937. | BASIONYM: Silphium orae Small 1933. | |
Silphium compositum subsp. reniforme
| Silphium compositum Michaux, subsp. reniforme (Rafinesque ex Nuttall) C. R. Sweeney & T. R. Fisher, in C. R. Sweeney, Ohio J. Sci. 70: 230. 1970. | BASIONYM: Silphium reniforme Rafinesque ex Nuttall 1840. | |
Silphium compositum var. reniforme
| Silphium compositum Michaux, var. reniforme (Rafinesque ex Nuttall) Torrey & A. Gray, Fl. N. Amer. 2: 276. 1842. | BASIONYM: Silphium reniforme Rafinesque ex Nuttall 1840. | |
Silphium lapsuum
| Silphium lapsuum Small, Man. S.E. Fl. 1411, 1509. 1933. | | TYPE: GEORGIA: Richmond Co.: Augusta, 17 Jul 1898, Cuthbert s.n. (holotype: NY; isotype: NY). |
Silphium orae
| Silphium orae Small, Man. S.E. Fl. 1411, 1509. 1933. | | TYPE: NORTH CAROLINA: New Hanover Co.: Wilmington, s.d., Curtis s.n. (holotype: NY). |
Silphium reniforme
| Silphium reniforme Rafinesque ex Nuttall, Trans. Amer. Philos. Soc., ser. 2. 7: 342. 1841. | | TYPE: Without data, Rafinesque s.n .(lectotype: PH). Lectotypified by C. R. Sweeney, Ohio J. Sci. 70: 230. 1970. |
Silphium terebinthinaceum var. sinuatum
| Silphium terebinthinaceum Jacquin, var. sinuatum M. A. Curtis, Boston J. Nat. Hist. 1: 127. 1837. | | |