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| Symphytum officinale L. | Gadella, T. W. & E. KLIPHUIS. 1984. Population variability, hybridization and introgression in Symphytum officinale L. in the Netherlands. Bot. Jahrb. Syst. 104: 519–536. | 84-85 | | 40-48 |
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| Symphytum officinale L. | Murin, A. & J. Majovsky. 1982. Die Bedeutung der Polyploidie in der Entwicklung in der Slowakei wachsenden Arten der Gattung Symphytum L. Acta Fac. Rerum Nat. Univ. Comenianae, Bot. 29: 1–25. | 82-83 | | 24,48 |
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| Symphytum officinale L. | SHIRATO, K., T. Shintani, G. Nakanishi & A. Kamizy;afo. 1985. Chromosome numbers in genus Symphytum. Chromosome Inf. Serv. 38: 21–23. | 84-85 | | 45 |
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| Symphytum officinale L. | Sekovski, Z. & M. Jovanovska. 1983. Chromosome atlas of some Macedonian angiosperms. IV. Ann. Fac. Biol. Univ. Skopje. 36: 73–86. | 84-85 | | 48 |
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| Symphytum officinale L. | Gadella, T. W. & E. KLIPHUIS. 1985. Diploide populaties van de Smeerwortel in Nederland bedreigd. Gorteria 12: 156–158. | 84-85 | | 24, 48 |
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| Symphytum officinale L. | Huizing, H. J. 1985. Phytochemistry, systematics and biogenesis of pyrrolizidine alkaloids of Symphytum taxa. Thesis, Meppel. ý. | 84-85 | | 24, 40, 48, 56 |
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| Symphytum officinale L. | Gadella, T. W. 1983. Enkele floristische en cytotaxonomische waaremingen op Schiermonnikoog. Gorteria 10: 227–229. | 82-83 | | 48 |
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| Symphytum officinale L. | Huizing, H. J., T. W. J. Gadella & E. Kliphuis. 1982. Chemotaxonomical investigations of the Symphytum officinale polyploid complex and S. asperum (Boraginaceae): The pyrrolizidine alkaloids. Pl. Syst. Evol. 140: 279–292. | 82-83 | | 24,40,48 |
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| Symphytum officinale L. | Krahulcová, A. 1988. Selected chromosome counts of the Czechoslovak flora I. Folia Geobot. Phytotax. 23: 375–381. | 88-89 | | 48 |
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| Symphytum officinale L. | Jaarsma, T. A., J. C. v. Loon, H. J. Huizing, T. M. Malingré & T. W. J. Gadella. 1989. Somaclonal variation in regenerated plants of Symphytum officinale L. Proc. Kon. Ned. Akad. Wetensch., C 92: 179–187. | 88-89 | | 24, 48 |
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| Symphytum officinale L. | Mekki, L., H. t. Hart, N. Z. El-Alfy, A. Dewedar & T. W. J. Gadella. 1987. The Giemsa C-banded karyotype of diploid Symphytum officinale (Boraginaceae). Acta Bot. Neerl. 36: 33–37. | 88-89 | | 24 |
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| Symphytum officinale L. | Parfenov, V. I. & S. A. Dmitrieva. 1988. Kariologicheskaja kharakteristika predstavitelej flory sosudistykh rastenij Berezinskogo biosfernogo zapovednika. Zapov. Belorussii Issl. 12: 3–8. | 90-91 | | 48 |
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| Symphytum officinale L. | Van Loon, J. C. & B. Kieft. 1980. In Chromosome number reports LXVIII. Taxon 29: 538–542. | 79-81 | | 24,40,48,56 |
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| Symphytum officinale L. | PERRING, F. H. 1975. Network research, Symphytum survey. Watsonia 10: 296–297. | 75-78 | | 24,48 |
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| Symphytum officinale L. | 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 | | 24,48,40,56 |
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| Symphytum officinale L. | 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 | | 40,48 |
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| Symphytum officinale L. | Peruzzi, L., F. Garbari & S. Bottega. 2001. Symphytum tanaicense (Boraginaceae) new for the Italian flora. Willdenowia 31: 33–41. | 01-03 | | 24+0-4B, 48 |
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| Symphytum officinale L. | Bottega, S., F. Garbari & L. Peruzzi. 2001. Mediterranean chromosome number reports 11 (1227--1231). Fl. Medit. 11: 436–439. | 01-03 | | 24+0-4B |
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