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| Rudbeckia hirta L. | Pogan, E. 1982. Further studies in chromosome numbers of Polish angiosperms. Part XVI. Acta Biol. Cracov., Ser. Bot. 24: 159–189. | 82-83 | | 38 |
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| Rudbeckia hirta L. | Wcislo, H. 1987. Chromosome numbers of certain Canadian plants. Acta Biol. Cracov., Ser. Bot. 29: 19–30. | 86-87 | | 38 |
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| Rudbeckia hirta L. | Mulligan, G. A. 1984. Chromosome numbers of some plants native and naturalized in Canada. Naturaliste Canad. 111: 447–449. | 84-85 | 19 | |
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| Rudbeckia hirta L. | Probatova, N. S., E. G. Rudyka & A. P. Sokolovskaya. 1996. Chromosome numbers in synanthropic plants from the Russian Far East. Bot. Zhurn. (Moscow & Leningrad) 81(5): 98–101. | 96-97 | | 38 |
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| Rudbeckia hirta L. | Morton, J. K. 1981. Chromosome numbers in Compositae from Canada and the U.S.A. Bot. J. Linn. Soc. 82: 357–368. | 79-81 | | 38 |
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| Rudbeckia hirta L. | Parfitt, B. D. 1981. ln Chromosome number reports LXXI. Taxon 30: 515–516. | 79-81 | 19,38 | 38 |
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| Rudbeckia hirta L. | Chen, R. y., W. q. Song, X. l. Li, M. x. Li, G. l. Liang & C. b. Chen. 2003. Chromosome Atlas of Major Economic Plants Genome in China, Vol. 3, Chromosome Atlas of Garden Flowering Plants in China. Science Press, Beijing. | 01-03 | | 38 |
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