Ferula
Meikle, R.D. 1977: Flora of Cyprus 1Tison, J.-M. & Foucault, B. de 2014: Flora Gallica. Flore de France but supplemented and accepted names differing
| 1 | Ultimate leaf segments cuneiform, up to 10 mm long |
| 1' | Ultimate leaf segments linear-filiform, more than 10 mm long |
| 2 | Fruit about 9 mm long, 5 mm wide, marginal wing very narrow, less than 0.5 mm wide; plant less than 2 m, often less than 1 m high |
| 2' | Fruit (10-)12-15 mm long, more than 5 mm wide, marginal wing 1.5-2 mm wide; plant very robust, often 2-5 m high |
| 3 | Ultimate leaf segments wider than 1 mm, flattish, lower surface glaucous, contrasting to the upper greenish surface; length/width relation of fruit > 2 |
| 3' | Ultimate leaf segments less than 1 mm wide, ovate or subcylindric in cross section, both surfaces concolorous; length/width relation of fruit < 2 |
