| Abbreviation | Definition |
|---|---|
| MP | Murmuring Pine |
| MPVD | Mexican Papita Viroid |
| MRML | Most Recent Mature Leaf |
| MSBP | Millennium Seed Bank Project |
| MSSS | Manitoba Soil Science Society |
| MST | Minimum Survival Temperature |
| MSV | Modern Semi-dwarf Variety |
| MSWN | Mountain States Wholesale Nursery |
| MTS | Moisture Transport System |
| MUFR | MUhlenbergia FRagilis Swallen |
| MUMD | Moist Upper Mixed Deciduous |
| MVPZ | Minimum Vegetation Protection Zone |
| MXE | Mexico Northeast |
| NABS | North American Biological Species |
| NANPS | North American Native Plant Society |
| NB | Non-forest Brush |
| NBF | National Bonsai Foundation |
| NBGN | National Botanic Garden of Namibia |
| NBN | National Biodiversity Network |
| NBPGR | National Bureau of Plant Genetic Resources |