| Cultivar | Hybridizer | Year | Ht. | Sz | Season | Re | Fol. | Fr | Spd | tet | Color | Mark | Price | Remarks |
| Magic Lace | Wilson T | 1988 | 23 | 6 | EM | dor | pastel pink | dsp | ||||||
| Make Believe Magic | Salter EH | 2000 | 29 | 4.3 | ML | y | s-ev | t | cream pink melon | blend | 15 | |||
| Malachi | Harris H | 1977 | 30 | 5.8 | EM | s-ev | t | burgundy | dsp | |||||
| Malaysian Monarch | Munson RW | 1986 | 24 | 6 | EM | y | s-ev | t | burgundy purple | cream throat | 8 | |||
| Mallard | Griesbach/Kl | 1979 | 25 | 6 | M | dor | t | red | 6 | |||||
| Mama's Cherry Pie | Shooter F | 1998 | 26 | 6 | M | y | s-ev | t | red, yellow edge | dark red eye | 12 | |||
| Mandarin | Farr | 1924 | 54 | M | y | dor | y | yellow | 8 | noc | ||||
| Mantra | Tankesley-Cl | 2001 | 27 | 5 | M | y | s-ev | wine | purple eye | 40 | ||||
| Maraschino | Tankesley-Cl | 1996 | 22 | 4.5 | EM | s-ev | bluish pink | cherry eye | 25 | |||||
| Marcus | Perry | 1932 | 33 | M | dor | light yellow-orange | 10 | historic | ||||||
| Margaret Perry | Perry | 1925 | 54 | ML | dor | orange | markings | 8 | historic | |||||
| Margaret Weimer | unreg | 28 | 4 | EM | dor | unr | purple | 5 | ||||||
| Marguerite Fuller | Kraus | 1948 | 40 | 5.5 | M | dor | pale chartreuse | 8 | parent to spiders? | |||||
| Marie Hooper Memorial | Carpenter J | 1988 | 26 | 8.3 | M | dor | y | melon pink blend | dsp | |||||
| Mariska | Moldovan | 1984 | 28 | 6.5 | M | y | dor | t | pink blend | 6 | ||||
| Marse Connell | Connell | 1952 | 38 | M | ev | y | red | white ribs | 6 | |||||
| Martie Everest | McDade-Parry | 1947 | 40 | 7 | ML | ev | va | orange-gold bicolor | 8 | quite late here; narrow | ||||
| Martinique | Atkiss | 1980 | 29 | 7 | EM | dor | y | t | apricot | lavender ribs | 5 | |||
| Marvelous You | Russell | 1956 | 30 | 4 | M | y | ev | star | orchid rose | 6 | ||||
| Mary Guenther | Russell | 1942 | 36 | E | y | ev | red bicolor | 6 | ||||||
| Mary Mae Simon | MacMillan | 1965 | 32 | 5.3 | E | y | ev | cream-pink blend | 6 | |||||
| Mary Todd | Fay | 1967 | 26 | 6 | E | s-ev | t | buff yellow | 5 | S.M. | ||||
| Master Stroke | Hall D | 1966 | 30 | 8.5 | EM | dor | pastel | orchid edge | 6 | |||||
| Mateus | Wild | 1979 | 30 | 5.5 | EM | y | dor | deep rose wine | 5 | |||||
| Matt | Harris H | 1982 | 20 | 5.5 | M | dor | t | yellow | 6 | |||||
| Maxfield Parrish | Trimmer | 1998 | 32 | 5.8 | M | dor | y | t | dark lavender | gold edge | dsp | |||
| Meadow Sprite | Hudson | 1979 | 13 | 3.3 | M | y | ev | magenta purple | 5 | |||||
| Melissa Ceresi | Yonski | 1983 | 24 | 5.5 | ML | dor | t | rose | 12 | |||||
| Melody Doll | Peck | 1972 | 22 | 5 | EM | dor | t | pink/orange blend | 10 | |||||
| Melon Balls | Wild | 1960 | 32 | M | dor | melon | dsp | |||||||
| Mephistopheles | Moldovan | 1990 | 30 | 5.8 | EM | y | dor | y | t | dark violet purple | 20 | |||
| Merry Monarch | Lambert | 1965 | 26 | 7 | E | s-ev | cardinal red bitone | darker eye | 8 | white edge | ||||
| Merry Witch | Munson RW | 1983 | 30 | 6 | M | y | ev | t | rose | lighter eye | 6 | |||
| Mexican Border | Christensen | 1950 | 44 | M | y | orange | darker eye | 10 | ||||||
| Mexican Pottery | Davis-Daniels | 1966 | 40 | 4 | EM | y | ev | y | copper/gold bicolor | dark red eye | 10 | |||
| Mexican Way | Reckamp | 1970 | 30 | 6 | ML | y | dor | t | melon-pink blend | 6 | ||||
| Mico | Joiner J | 1968 | 44 | 10 | M | dor | y | gold | 8 | taller here | ||||
| Midnight Magic | Kinnebrew | 1979 | 28 | 5.5 | EM | ev | t | black red | 6 | |||||
| Midnight Oil | Apps | 1995 | 36 | 4 | M | dor | deep black purple | dsp | ||||||
| Mikado | Stout | 1929 | 36 | EM | y | s-ev | orange-gold | red eye | 6 | Stout's first; historic | ||||
| Milk Chocolate | Carney | unreg | 28 | 4 | M | unr | brown | 6 | ||||||
| Ming Porcelain | Kirchhoff | 1981 | 28 | 5.3 | E | y | ev | y | t | pink | yellow halo | 5 | ||
| Miniature King | Wild | 1966 | 23 | 3.5 | EM | dor | yellow | orange eye | 5 | |||||
| Minotaur | Ware | 2002 | 50 | 5.5 | M | dor | y | star | yellow gold | 20 | ||||
| Mirimichi | Childs F | 1968 | 34 | M | dor | copper gold polych | 6 | |||||||
| Miss Jessie | Hardy | 1956 | 40 | M | dor | va | mauve bicolor | 6 | ||||||
| Miss Pennsylvania | Burkey | 1988 | 28 | 6 | EE | y | ev | t | peach polychrome | bicolor, halo | 12 | |||
| Mississippi Magic | Wall | 1977 | 36 | 8 | M | dor | peach blend | 8 | ||||||
| Missouri Beauty | Wild | 1966 | 33 | 5 | EM | dor | light yellow | 5 | ||||||
| Missouri Miss | Wild | 1963 | 30 | 7 | E | dor | pale orange | 5 | ||||||
| Missouri Royalty | Wild | 1967 | 39 | 6 | E | dor | black red | 5 | ||||||
| Mister | Russell | 1954 | 30 | M | ev | orange | markings | 8 | ||||||
| Mister Big | Turner R | 1963 | 41 | 8 | EM | ev | yellow | 8 | ||||||
| Mister Epps | Ware | 2005 | 54 | 7 | M | dor | dark purple | chalky halo | 100 | |||||
| Model | Tankesley-Cl | 2002 | 40 | 6.3 | ML | s-ev | rose red | green heart | 50 | |||||
| Mokan Moon | Lenington G | 1976 | 28 | 7 | ML | y | s-ev | t | gold | 6 | ||||
| Monster | Pettus | 1975 | 32 | 9 | M | dor | t | yellow blend | 8 | |||||
| Mont Blanc Special | Peck | 1989 | 29 | 7.5 | ML | dor | t | near white | dsp | |||||
| Monte | Russell | 1945 | 36 | EM | y | dor | red/gold bicolor | dsp | ||||||
| Moonbeam | Sass HP | 1940 | 56 | ML | dor | vf | light yellow | 10 | historic | |||||
| Moonless Night | Rasmussen | 1985 | 30 | 6 | ML | dor | t | [black] red | dsp | |||||
| Moonshadow | Fay | 1973 | 27 | 6 | M | ev | y | t | yellow | 10 | ||||
| Mrs. A. H. Austin | Betscher | 1929 | 36 | M | dor | medium yellow-orange | dsp | |||||||
| Mrs. W. H. Wyman | Betscher/Wy | 1929 | 40 | L | dor | light yellow | 8 | |||||||
| Mulleri | Sprenger | 1903 | 48 | EM | dor | y | yellow | 8 | noc; historic | |||||
| Multnomah | Kraus | 1954 | 30 | M | dor | pale yellow-orange | pink rib | 8 | S.M. | |||||
| Muscle Man | Hager | 1978 | 42 | 7.5 | M | y | dor | t | red/bronze blend | 10 | ||||
| Music Man | Wild | 1973 | 29 | 6.5 | M | dor | red | 6 | truly a top performer | |||||
| My Feathered Friend | Houston | 1998 | 25 | 4.3 | EM | y | ev | y | t | tangerine orange | gold edge | 20 | ||
| Mynelle's Starfish | Hayward M | 1982 | 20 | 10 | M | y | dor | va | ivory | 10 | noc | |||
| Myrna | Saxton | 1947 | 38 | ML | dor | dark red | 8 | |||||||
| Mystery Valley | Hall D | 1971 | 28 | 5.5 | ML | y | dor | pink rose | 10 |