| Abbrev | Name | Spec | Type | Locality |
|---|---|---|---|---|
| MSS,1 | MASSEY[1281]; | TR.AE | USA | |
| MRK | MAVERICK[1281]; | TR.AE | USA | |
| MCK-1 | MAY-COCK-1[1281]; | TR.DR | S | MEX |
| MCK-2 | MAY-COCK-2[1281]; | TR.DR | S | MEX |
| MCK | MAY-COCK[1281]; | TR.DR | S | MEX |
| MFOWL | MAY-FOWL[1281]; | TR.DR | S | MEX |
| MY52A | MAYO-52-A[1281]; | TR.AE | S | MEX |
| MY52 | MAYO-52[1281]; | TR.AE | S | MEX |
| MY54E | MAYO-54-E[1281]; | TR.AE | S | MEX |
| MY,1 | MAYO[1281]; | TR.AE | S | MEX |
| MVW | MAYVIEW[1281]; | TR.AE | USA | |
| MC18F2 | MC-18-F2[1281]; | TR.AE | KOR | |
| MC | MC-CALL[1281]; | TR.AE | USA | |
| MCD | MCDERMID[1281]; | TR.AE | USA | |
| MR1813 | MC-NAIR-1813[1281]; | TR.AE | USA | |
| MCNAIR | MC-NAIR-SEL.[1281]; | |||
| MLY,1 | MEALY[1281]; | TR.AE | USA | |
| MEC3 | MEC-3[1281]; | TR.AE | ||
| MEH | MECOH[1281]; | TR.DR | S | MEX |
| MDH | MEDEAH[1281]; | TR.AE |