Symphytum asperum Lepechin | Gagnidze, R. I., T. N. Gviniaschvili, M. G. Pataraia & L. D. Dzindzolia. 1985. Chromosome numbers in some high elevation species from the Big Caucasus. Bot. Zhurn. SSSR 70(12): 1698–1699. (In Russian). | 84-85 | | 32 |
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Symphytum asperum Lepechin | 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 asperum Lepechin | Huizing, H. J. 1985. Phytochemistry, systematics and biogenesis of pyrrolizidine alkaloids of Symphytum taxa. Thesis, Meppel. ý. | 84-85 | | 32 |
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Symphytum asperum Lepechin | PERRING, F. H. 1975. Network research, Symphytum survey. Watsonia 10: 296–297. | 75-78 | | 32 |
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Symphytum asperum Lepechin | Gadella, T. W. J. & E. Kliphuis. 1975. Cytotaxonomic studies in the genus Symphytum VII. Some hybrids between S. asperum Lepech. and S. officinale L. in Denmark. Proc. Kon. Ned. Akad. Wetensch., C 78: 182–188. | 75-78 | | 32 |
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Symphytum asperum Lepechin | 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 | | 32 |
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