Origanum
Ietswaart, J.H. 1980: A taxonomic revision of the genus Origanum (Labiatae)Meikle, R.D. 1985: Flora of Cyprus 2 but supplemented and modified
| 1 | Bracts large, showy, pink or purplish, suborbicular, imbricate, 0.8-2 cm diam.; leaves broadly ovate-cordate, sessile, glabrous |
| 1' | Bracts inconspicuous, small, less than 0.8 cm long; leaves not as above |
| 2 | Bracts loosely imbricate, oblong or lanceolate, distinctly longer than wide, glabrous or sparsely strigillose; calyx tubular |
| 2' | Bracts closely imbricate, broadly ovate, obovate or suborbicular, densely pubescent or tomentose; calyx sheath-like, slit almost to base abaxially |
| 3 | Corolla-tube c. 12 mm long; flowers purple; leaves glabrous |
| 3' | Corolla-tube short, c. 4 mm long; flowers white; leaves thinly hairy on both surfaces |
| 4 | Spikes arranged in false corymbs; leaf margins often serrulate |
| 4' | Spikes arranged in panicles; leaf margins entire or subentire and remotely serrulate |
| 5 | Underside of leaf prominently and conspicuously reticulate-veined |
| 5' | Underside of leaf inconspicuously veined |
| 6 | Inflorescence thyrsoid or subcorymbose, compact and not extending far down the stem; calyx c. 1.5 x 1.3 mm |
| 6' | Inflorescence elongate, narrow, lax, extending far down the stem; calyx c. 2 x 1.5 mm |
