Cirsium undulatum (Nutt.) Spreng. | Love, A. & D. Love. 1982. In: A Löve (ed.), IOPB chromosome number reports LXXV. Taxon 31(2): 344–360. | 82-83 | | 26 |
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Cirsium undulatum (Nutt.) Spreng. | Dabydeen, S. 1987. Natural hybridization in the genus Cirsium: C. flodmanii x C. undulatum. Rhodora 89: 369–373. | 86-87 | | 26 |
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Cirsium undulatum (Nutt.) Spreng. | Ward, D. E. & R. Spellenberg. 1988. Chromosome counts of angiosperms from New Mexico and adjacent areas. Phytologia 64: 390–398. | 88-89 | 13 | |
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Cirsium undulatum (Nutt.) Spreng. | 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. | 75-78 | | 26 |
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Cirsium undulatum (Nutt.) Spreng. | Pinkava, D. J. & D. J. Keil. 1977. Chromosome counts of Compositae from the United States and Mexico. Amer. J. Bot. 64: 680–686. | 75-78 | 12,13 | |
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