| Cultivar Name | Source | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Registered |
| 'Madam' | Scheer, Alttara | Small | Yellow | - | - | Unknown | - | - | --NR-- |
| 'Madison' | Sanford, Matt | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | June into July | .2011 |
| 'Magna Carta' | Bennerup, Pierre & Malloy, Alex | Small | Med-Green | Medial | White | Nat-Sport | Med-Lavender | July | .2001 |
| 'Major Tom' | Scheer, Alttara | Medium | Dark-Green | - | - | Unknown | - | - | --NR-- |
| 'Margaret' | Stone, David & Ruh, Peter | Miniature | Med-Green | - | - | Unknown | Light-Purple | August | .1987 |
| 'Margaritaville' | Meyer, Bill & Brashear, Carol | Large | Light-Green | Marginal | Dark Green | Unknown | - | - | --NR-- |
| 'Marquee' | Laviana, Marc | Medium | Blue/Green | Medial | Yellow | Unknown | - | - | --NR-- |
| 'Mary Jo' | Stone, David & Ruh, Peter | Small | Blue/Green | - | - | Unknown | Pale-Lavender | July | .1987 |
| 'Maya Infatuation' | Scheer, Alttara | - | Yellow | - | - | Unknown | - | August | --NR-- |
| 'Maya Kingsnake' | Scheer, Alttara | Medium | Med-Green | - | - | Unknown | Light-Purple | August | --NR-- |
| 'Maya Swingtime' | Scheer, Alttara | Medium | Light-Green | - | - | Unknown | - | - | --NR-- |
| 'Maya Tritone' | Scheer, Alttara | Medium | Med-Green | Streaked | Speckles | Unknown | Med-Lavender | July | --NR-- |
| 'Mohegan' | Megos, Stan & Malloy, Alex | Large | Blue/Green | - | - | Unknown | Near-White | June | .1998 |
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