Mentha
Meikle, R.D. 1985: Flora of Cyprus 2 but modified and names used differing
| 1 | Calyx hairy in throat, with unequal teeth; flowers borne in whorls subtended by leaf-like bracts |
| 1' | Calyx glabrous in throat, with more or less equal teeth; flowers borne in a terminal head or spike |
| 2 | Leaves with petioles 10 mm, or more; flowers borne in terminal head |
| 2' | Leaves with very short petioles usually less than 5 mm, or sessile; flowers borne in a congested or interrupted terminal spike |
| 3 | Middle cauline leaves broadest at or above the middle, grey-green and finely but densely puberulous on both surfaces, with simple curved hairs with a felted appearence when dry; basal cell of leaf-hairs 18-36(-41) μm diam. |
| 3' | Middle cauline leaves broadest below the middle, green and glabrous to coarsely grey-green or grey-villous beneath, with simple hairs, branched hairs often also present; basal cell of leaf-hairs 35-49 μm diam. |
| 4 | Plant glabrous or hairy; cauline leaves usually over 12 mm wide, margin flat; spike 40-80(-110) mm long |
| 4' | Plant always hairy; cauline leaves usually under 12 mm wide, margin often undulate; spike (35-)70-110(-140) mm long |
