| Ballota nigra L. | Pogan, E. 1982. Further studies in chromosome numbers of Polish angiosperms. Part XVI. Acta Biol. Cracov., Ser. Bot. 24: 159–189. | 82-83 | | 20 |
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| Ballota nigra L. | Gill, B. S., S. S. Bir & Y. S. Bedi. 1981. Cytological studies on woody Euphorbiaceae from North and Central India. New Botanist 8: 35–44. | 82-83 | 11 | |
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| Ballota nigra L. | Gill, L. S. 1983. Cytotaxonomic studies of the tribe Stachydeae (Labiatae) in Canada. Willdenowia 13: 175–181. | 82-83 | 11 | |
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| Ballota nigra L. | `opova, M. & Ž. Sekovski. 1989. Chromosome atlas of some Macedonian angiosperms. V. God. Zborn. Biol. Prir.-Mat. Fak. Univ. Kiril & Metodij 39–40: 353–365. | 88-89 | | 22 |
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| Ballota nigra L. | Singh, T. P. 1984. Chromosome studies in some genera of Labiatae. Cell Chromosome Res. 7: 53–55. | 90-91 | | 18 |
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| Ballota nigra L. | Fernandes, A. & M. T. Leitão. 1984. Contribution à l'étude cytotaxinomique des Spermatophyta du Portugal XVIII---Lamiaceae. Mem. Soc. Brot. 27: 27–75. | 92-93 | | 22 |
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| Ballota nigra L. | Strid, A. & R. Franzen. 1981. In Chromosome number reports LXXIII. Taxon 30: 829–842. | 79-81 | 11 | 20 |
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| Ballota nigra L. | LOON VAN, J. C. & H. D. JONG. 1978. In IOPB chromosome number reports LIX. Taxon 27: 53–61. | | | 22 |
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