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Symphytum cordatum W. & K. | Pashuk, K. T. 1987. Chromosome numbers in species of subalpine belt of Chernogora (Ukrainian Carpatians). Bot. Zhurn. 72: 1069–1074. | 86-87 | | 72 |
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Symphytum cordatum W. & K. | Gadella, T. W. 1983. Enkele floristische en cytotaxonomische waaremingen op Schiermonnikoog. Gorteria 10: 227–229. | 82-83 | | 24,40,48,56 |
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Symphytum cordatum W. & K. | Murin, A. 1978. In Index of chromosome numbers of Slovakian flora. Part 6. Acta Fac. Rerum Nat. Univ. Comenianae, Bot. 26: 1–42. | 75-78 | | ca.120 |
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Symphytum cordatum W. & K. | Gadella, T. W. J. & E. Kliphuis. 1978. Cytotaxonomic studies in the genus Symphyrum. VIII. Chromosome numbers and classification of ten European species. Proc. Kon. Ned. Akad. Wetensch., C 81: 162–172. | 75-78 | | 120 |
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