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| Hypericum ascyron L. | Malakhova, L. A. 1990. Kariologocheskij analiz prirodnykh populjacij redkich i ischezajushchikh rastenij na juge Tomskoj Oblasti. Bjulleten' Glavnogo Botaničeskogo Sada 155: 60–66. | 90-91 | | 18 |
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| Hypericum ascyron L. | Krasnoborov, I. M., T. S. Rostovtseva & S. A. Ligus. 1980. Chromosome numbers of some plant species of South Siberia and the Far East. Bot. Zhurn. 65 (5): 659–668. | 79-81 | | ca 20-22 |
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| Hypericum ascyron L. | Krogulevich, R.E. 1978. Karyological analysis of the species of the flora of eastern Sayana. 19–48. In L. I. Malyschev & G. A. Peschkova (eds.) Fl. Prebaikalya. Nauka, Novosibirsk. | | | 16 |
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| Hypericum ascyron L. | Probatova. 2005. Chromosome numbers of some dicotyledons of the flora of the Amur Region. Bot. Zhurn. (Moscow & Leningrad) 90(5): 779–792. | 04-06 | | 18 |
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