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CCDB → Angiosperms → Compositae → Carduus → Carduus occidentalis Nutt.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Carduus occidentalis Nutt. | Carduus occidentalis Nutt. | 16 | Flora Iberica | Contribucin al estudio cariolgico del gnero Carduus en la Pennsula Ibrica. Devesa, J. A.Lagascalia10(1): 65-80(1981). | ||
| Cirsium occidentale (Nutt.) Jeps. | Carduus occidentalis Nutt. | 15, 15+1supn.(2, 1) | Asteracea | Ownbey et al. 1975 Brittonia | |||
| ! | Cirsium occidentale (Nutt.) Jeps. | Carduus occidentalis Nutt. | 15II(1) | Asteracea | Keil et al. 1988 Amer. J. Bot. | ||
| Cirsium occidentale (Nutt.) Jeps. | Carduus occidentalis Nutt. | 30 | IPCN online | Ownbey, G. B., P. H. Raven & D. W. Kyhos. 1975 [1976]. Chromosome numbers in some North American species of the genus Cirsium. III. Western United States, Mexico, and Guatemala. Brittonia 27(4): 297–304. | |||
| ! | Cirsium occidentale (Nutt.) Jeps. | Carduus occidentalis Nutt. | 15II | IPCN online | Keil, D. J., M. A. Luckow & D. J. Pinkava. 1988. Chromosome studies in Asteraceae from the United States, Mexico, the West Indies, and South America. Amer. J. Bot. 75: 652–668. | ||
| ! | Cirsium occidentale (Nutt.) Jeps. | Carduus occidentalis Nutt. | "28-30" | 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. | ||
| ! | Cirsium occidentale (Nutt.) Jeps. | Carduus occidentalis Nutt. | 28,29,30 | eFlora | |||
| ! | Cirsium occidentale (Nutt.) Jeps. | Carduus occidentalis Nutt. | 30 | Cave1963 | Moore & Frank, 1963 |