| NAME OF PLANT | WHERE FOUND | DATE | WHERE FOUND | DATE |
| Mentha arvensis | ||||
| corn mint | ||||
| Mentha spicata | ||||
| spear mint | ||||
| Mentha x villosa | ||||
| apple mint | ||||
| Menyanthes trifoliata | ||||
| bogbean | ||||
| Mercurialis annua | ||||
| annual mercury | ||||
| Mercurialis perennis | ||||
| dog's mercury | ||||
| Meum athamanticum | ||||
| spignel | ||||
| Milium effusum | ||||
| wood millet | ||||
| Mimulus guttatus | ||||
| monkeyflower | ||||
| Mimulus x robertsii | ||||
| hybrid monkeyflower | ||||
| Minuartia verna | ||||
| spring sandwort | ||||
| Moehringia trinervia | ||||
| three-nerved sandwort | ||||
| Molinea caerulea | ||||
| purple moor-grass | ||||
| Monotropa hypopitys | ||||
| yellow bird's-nest | ||||
| Montia fontana | ||||
| blinks | ||||
| Mycelis muralis | ||||
| wall lettuce | ||||
| Myosotis arvensis | ||||
| field forget-me-not | ||||
| Myosotis discolor | ||||
| changing forget-me-not | ||||
| Myosotis laxa | ||||
| tufted forget-me-not | ||||
| Myosotis ramosissima | ||||
| early forget-me-not | ||||
| 57 | ||||