Echium
Meikle, R.D. 1985: Flora of Cyprus 2 but modified and supplemented
| 1 | Stamens included in corolla; corolla usually less than 1 cm long, violet-blue or mauve; stems prostrate or sprawling |
| 1' | Stamens exserted from corolla, if included corolla more than 2 cm long; stems erect, rarely sprawling |
| 2 | Inflorescence narrowly cylindrical or spiciform, usually unbranched; corolla pink or whitish |
| 2' | Inflorescence pyramidal or irregularly branched, not narrowly cylindrical |
| 3 | Corolla 2-3.5 cm long |
| 3' | Corolla less than 1.5 cm long |
| 4 | Stamens included or the 2 longer ones shortly exserted from corolla; filaments glabrous |
| 4' | Stamens distinctly exserted from corolla; filaments thinly clothed with long hairs |
| 5 | Plant biennial; whole inflorescence conical or pyramidal; flowers pale blue or whitish |
| 5' | Plant perennial with a woody rootstock; whole inflorescence irregularly branched; flowers red or purple |
