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CCDB → Angiosperms → Compositae → Silphium → Silphium radula var. gracile (A. Gray) J. A. Clevinger
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Silphium radula var. gracile (A. Gray) J. A. Clevinger | Silphium radula var. gracile (A. Gray) J. A. Clevinger | 14(1) | Asteracea | Zhao 1996 Sida (= J. Bot. Res. Inst. Texas) | |||
| Silphium gracile A. Gray | Silphium radula var. gracile (A. Gray) J. A. Clevinger | 14 | IPCN online | Xu, H. y., M. y. Chang & L. c. Tian. 1992. Studies on the karyotypes of 8 species in Silphium. Chin. Bull. Bot. 9(3): 47–49. | |||
| Silphium gracile A. Gray | Silphium radula var. gracile (A. Gray) J. A. Clevinger | 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 gracile A. Gray | Silphium radula var. gracile (A. Gray) 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 radula var. gracile (A. Gray) J. A. Clevinger | Silphium radula var. gracile (A. Gray) J. A. Clevinger | 14 | eFlora |