| Boraginaceae | |
Caccinia crassifolia var. echinata
| Popov | Trudy Bot. Sada Imp. Yur'evsk. Univ. 12: 241 | 1911 |
| Boraginaceae | |
Caccinia crassifolia fo. linearifolia
| Kuntze | Trudy Imp. S.-Peterburgsk. Bot. Sada 10: 212 | 1887 |
| Boraginaceae | ** |
Caccinia crassifolia fo. normalis
| (Vent.) Kuntze | Trudy Imp. S.-Peterburgsk. Bot. Sada 10: 212 | 1887 |
| Boraginaceae | |
Caccinia crassifolia fo. obtusifolia
| Popov | Trudy Bot. Sada Imp. Yur'evsk. Univ. 12: 241 | 1911 |
| Boraginaceae | |
Caccinia crassifolia fo. persica
| Popov | Trudy Bot. Sada Imp. Yur'evsk. Univ. 12: 240 | 1911 |