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CCDB → Angiosperms → Compositae → Silphium → Silphium radula Nutt.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Silphium radula var. radula | Silphium radula Nutt. | 7(1) | Asteracea | Fisher & C. 1962 Ohio J. Sci. | |||
| Silphium radula Nutt. | Silphium radula Nutt. | 8(1) | Asteracea | Smith, E. B. et al. 1992 Sida (= J. Bot. Res. Inst. Texas) | |||
| Silphium radula var. radula | Silphium radula Nutt. | 14(1) | Asteracea | Zhao 1996 Sida (= J. Bot. Res. Inst. Texas) | |||
| ! | Silphium simpsonii var. wrightii L. M. Perry | Silphium radula Nutt. | 14 | IPCN online | Zhao, Z. 1996. Documented chromosome numbers 1996:2. Miscellaneous U. S. A. and Mexican species, mostly Asteraceae. Sida 17(1): 259–263. | ||
| Silphium radula Nutt. | Silphium radula Nutt. | 8 | IPCN online | Smith, E. B., P. E. Hyatt & K. D. Golden. 1992. Documented chromosome numbers 1992: 1. Chromosome numbers of some Arkansas flowering plants. Sida 15: 145–146. | |||
| ! | Silphium reverchonii Bush | Silphium radula Nutt. | 14 | IPCN67-71 | SETTLE, w. J. 1967. The chromosome morphology in the genus Silphium (Compositae). Ohio Jour. Sci. 67: 10-19. | ||
| Silphium radula var. radula | Silphium radula Nutt. | 14 | eFlora | ||||
| Silphium reverchonii Bush | Silphium radula Nutt. | 14 | Fedorov, 1974 | Fisher T. R., Cruden 1962 | |||
| Silphium reverchonii Bush | Silphium radula Nutt. | 7 | Cave1962 | Fisher & Cruden 1962 |