CCDB → Angiosperms → Gentianaceae → Blackstonia
| Taxon name | Status | Median (n) |
| Blackstonia acuminata (Koch & Ziz) Domin | Accepted | 20 |
| Blackstonia acuminata subsp. aestiva (K. Malý) Zeltner | Accepted | 10 |
| Blackstonia grandiflora (Viv.) Maire | Accepted | 10 |
| Blackstonia imperfoliata (L.) Samp. | Accepted | 10 |
| Blackstonia perfoliata (L.) Huds. | Accepted | 20 |
| Blackstonia perfoliata subsp. intermedia (Ten.) Zeltner | Accepted | 10 |
| Blackstonia acuminata | Synonym of Blackstonia acuminata (Koch & Ziz) Domin | 20 |
| Blackstonia acuminata (K. E. Ziz) Domin | Synonym of Blackstonia acuminata (Koch & Ziz) Domin | 20 |
| Blackstonia perfoliata subsp. serotina (Rchb.) Vollm. | Synonym of Blackstonia acuminata (Koch & Ziz) Domin | 20 |
| Blackstonia serotina (Rchb.) Beck | Synonym of Blackstonia acuminata (Koch & Ziz) Domin | 20 |
| Blackstonia perfoliata | Synonym of Blackstonia perfoliata (L.) Huds. | 20 |
| Chlora perfoliata (L.) L. | Synonym of Blackstonia perfoliata (L.) Huds. | 20 |