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CCDB → Angiosperms → Compositae → Silphium → Silphium simpsonii Greene
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Silphium simpsonii Greene | Silphium asteriscus var. simpsonii (Greene) J. A. Clevinger | 14 | IPCN67-71 | SETTLE, w. J. 1967. The chromosome morphology in the genus Silphium (Compositae). Ohio Jour. Sci. 67: 10-19. | |||
| Silphium simpsonii Greene | Silphium asteriscus var. simpsonii (Greene) J. A. Clevinger | 14 | Fedorov, 1974 | Fisher T. R., Cruden 1962 | |||
| Silphium simpsonii Greene | Silphium asteriscus var. simpsonii (Greene) J. A. Clevinger | 7 | Cave1962 | Fisher & Cruden 1962 |