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| Epipactis helleborine (L.) Crantz | Verlaque, R., M. Seidenbinder & C. Reynaud. 1987. Recherches cytotaxonomiques sur la spéciation en région Méditerranéenne III: esp@4ces aneuploides. Biol.-Ecol. Medit. 10: 315–346. | 88-89 | | 40 |
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| Epipactis helleborine (L.) Crantz | Malakhova, L. A. & G. A. Markova. 1994. Chromosome numbers in the flowering plants of Tomsk region. Monocotyledones. Bot. Zhurn. (Moscow & Leningrad) 79(7): 134–135. | 94-95 | | 38 |
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| Epipactis helleborine (L.) Crantz | VIJ, S. P., N. Vaidya & K. Kondo. 1995. Chromosomes and their bearing on species diversification in Epipactis (Orchidaceae). Kromosomo 77: 2646–2659. | 94-95 | 20 | 40 |
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| Epipactis helleborine (L.) Crantz | D'Emerico, S., P. Grünanger, A. Scrugli & D. Pignone. 1999. Karyomorphological parameters and C-band distribution suggest phyletic relationships within the subtribe Limodorinae (Orchidaceae). Pl. Syst. Evol. 217: 147–161. | 98-00 | | 40 |
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| Epipactis helleborine (L.) Crantz | Averyanov, L. V. 1979. Chromosome numbers of some species of Orchidaceae from the northwestern part of the USSR. Bot. Zhurn. 64 (6): 863–877. | 79-81 | | 40 |
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| Epipactis helleborine (L.) Crantz | Bernardos, S., F. Amich & A. Crespí. 2003. Karyological and taxonomical notes on three species of the genus Epipactis (Neottioideae, Orchidaceae) in the central-western Iberian Peninsula. Folia Geobot. 38(3): 319–331. | 01-03 | | 18, 18+2B, 32, 38, 40 |
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