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CCDB → Angiosperms → Compositae → Cirsium → Cirsium tweedyi (Rydb.) Petr.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Cirsium tweedyi (Rydb.) Petr. | Cirsium eatonii var. murdockii S. L. Welsh | 34 | IPCN65 | Moore & F. 1965 | ||
| ! | Cirsium tweedyi (Rydb.) Petr. | Cirsium eatonii var. murdockii S. L. Welsh | 34 | IPCN67-71 | OWNBEY, G.B., & Y-T. HSI. 1969. Chromosome numbers in some North American species of the genus Cirsium. II. Western United states. Madrono 20: 225-228. |