| Hostaname | RG | SZ | Leaf color | P | F | Origin |
| H. 'M. Owen Papuga' S. Chamberlain 2003 | R | | dgr | | | 'Sum and Substance' hybrid |
| H. 'MacBenedict' E. Elslager 2002 | R | VL | gr,str,y,cr | | | 'Dorothy Benedict' hybrid |
| H. 'Machete' Bob Solberg 2004 | R | | gr | | | 'Ginsu Knife' sport |
| H. 'Mack the Knife' J. Dishon 1996 | R | D | dgr,ore | | | 'Galaxy' x 'Hadspen Heron' |
| H. 'Madame Butterfly' H. Gowen/H. Hansen/R. Benedict 1999 | R | | cr,gre | | | 'Dorset Clown' hybrid |
| H. 'Made from Scratch' Stuart Asch 2005 | R | | gr,we | | | 'Dorothy Benedict' hybrid |
| H. 'Made You Look' Stuart Asch 2000 | R | | y,goye | | | "Dorothy Benedict seedling" hybrid |
| H. 'Madelynn' Van Wade/D. Darr 2007 | R | | blgr | | | unknown |
| H. 'Mademoiselle' R. Klehm 1999 | R | | w,gre | | | 'Patriot' sport |
| H. 'Maggie May' Bridgewood Gardens 2001 | R | L | dgr | | | hypoleuca hybrid |
| H. 'Magic Carpet' R. Duback 1998 | R | S | dgr,ye | | | 'Emerald Carpet' sport |
| H. 'Magic Colors' Doug Beilstein/Alex Malloy 2005 | R | S | gr,str,w | | | ('Akarana' sport) hybrid |
| H. 'Magic Fire' Jan van den Top/Danny Van Eechaute 2004 | R | | gr,brye | | | 'Sagae' sport |
| H. 'Magic Mountain' D. & J. Ward 2003 | R | | blgr | | | montana f. macrophylla hybrid |
| H. 'Magna Carta' P. Bennerup/ A. Malloy 2001 | R | | w,dgre | | | 'Sheila Maqueen' sport |
| H. 'Magnificent Michele' D. & J. Ward 2005 | R | | bl | | | 'Frosty Morn' hybrid |
| H. 'Magnificent Obsession' E. Elslager 1999 | R | | str,gr,cr,y | | | 'Galaxy' x hypoleuca |
| H. 'Maid Marian' J. Schwarz 2000 | R | | crw,gre | | | unknown |
| H. 'Maize and Blue' J. Wilkins 2000 | R | | str,gr,y | | | unknown |
| H. 'Majestic' Randy Goodwin 2005 | R | | dgr,we | | | (x 'Splashed Leather') x 'Yellow Splash' |
| H. 'Majestic Glow' Ken Anderson 1982 | R | M | chy | | | unknown |
| H. 'Majesty' R. Garbe 1999 | R | | gr,lye | | | 'Sagae' sport |
| H. 'Majordomo' E. & J. Deckert 2004 | R | | blgr>gr | PU | | unknown |
| H. 'Mama's Gold' R. Snyder 1999 | R | | goy>gry | | | ventricosa hybrid |
| H. 'Mañana' C. Tompkins/P. & J. Ruh 2001 | R | | dgr | | | unknown |
| H. 'Mango Tango' Eric Kinman/Stark Gardens 2007 | R | SM | y,gre | | | 'Dance with Me' sport |
| H. 'Manhattan' O. Petryszyn/B. Brincka 1994 | R | L | gr | | | 'Sea Frolic' hybrid |
| H. 'Maple Leaf' Eldren W. Minks 1972 | R | ML | gr,che | | | 'Frances Williams' sport |
| H. 'Maraschino Cherry' M. Zilis/R. Solberg 1999 | R | SM | dgr | R | | 'Cherry Berry' sport |
| H. 'Marble Rim' Florence Shaw/Alex Summers/AHS 1986 | R | SM | gr,cre | | | unknown |
| H. 'Marbled Bouquet' Clarence H. Falstad 1988 | R | M | str,y,w | | Y | plantaginea sport |
| H. 'Marbled Cream' Clarence O. Owens 1985 | R | SML | str,dgr,cr | | | 'Yellow Splash' hybrid |
| H. 'Marbled Cream Elite' Clarence Owens 1999 | R | | crw,dgre | | | 'Marbled Cream' sport |
| H. 'Marcella' E. Schulz 2002 | R | | gr,crwe | | | 'Nancy Minks' hybrid |
| H. 'March for Life' R. Snyder 2001 | R | D | dgr | | | 'Lakeside Little Gem' hybrid |
| H. 'Mardi Gras ' Olga Petryszyn 2001 | R | | dgr,crwe | | | 'Christmas Tree Gala' x 'Elatior' |
| H. 'Margaret' David Stone/Peter Ruh 1987 | R | S | gr | | | unknown |
| H. 'Margaret Eyre' Tom Micheletti 2007 | R | | dgr,ye | | | 'Fascination' x 'Sagae' |
| H. 'Margaret Mary Tiara' D. Hovekamp 2001 | R | | dgr,we | | | 'Diamond Tiara' sport |
| H. 'Marge' L. Simpers/M. Soules 1996 | R | M | gr | | | sieboldiana hybrid |
| H. 'Margey' P. Banyai/C. Helsley 1998 | R | D | gr | | | unknown |
| H. 'Margie Weissenberger' Henry Weissenberger 1986 | R | S | blgr | | | 'Blue Cadet' hybrid |
| H. 'Margie's Angel' Bob Solberg 2007 | R | | y,gre | | | 'Heart Throb' seedling |
| H. 'Margin of Error' B. Kuk 1995 | R | M | gr,crwe | | | 'Artist's Palette' sport |
| H. 'Margrit Anna' B. Olson 1999 | R | | y,we | | | 'Christmas Tree variegated' hybrid |
| H. 'Marie Curie' K. Hensen/P. Ruh 2002 | R | L | blgr | | | unknown |
| H. 'Marilyn' Mark R. Zilis 1990 | R | SM | y | | | 'Gold Drop' x 'Green Piecrust' |
| H. 'Marilyn Monroe' Jim Hawes/P. & J. Ruh 2005 | R | | lgr | R | | longipes 'Urajiro Hachijo' hybrid |
| H. 'Marion Bachman' L. Bachman 1992 | R | M | ygr,dgre | | | 'Fortunei' sport |
| H. 'Mark Anthony' G. Johnson/L. Ferguson 2004 | R | | | | | ('Dorothy Benedict' x 'Gold Regal') seedling |
| H. 'Marla' D. Courtney 2003 | R | | w,dgre | | | 'Fortunei Aoki' sport |
| H. 'Marlene' Kuk’s Forest/Bob Kuk 2005 | R | | goy | | | 'Rippling Waves' sport |
| H. 'Marnie's Delight' R. Kuenster 2006 | R | | gry,y,dgre | | | unknown |
| H. 'Marquette Park' Mark Zilis 2003 | R | M | gr,ye | | | 'Lovely Loretta' sport |
| H. 'Marquis' Robert P. Savory 1982 | R | SM | gr | | | nakaiana hybrid |
| H. 'Martin Van Buren' H. Sugita/P. & J. Ruh 2005 | R | | gr | R | | kiyosumiensis x pycnophylla |
| H. 'Mary Jo' David Stone/Peter Ruh 1987 | R | S | blgr | | | unknown |
| H. 'Mary Lou' Pauline Banyai 1986 | R | ML | bl>gr | | | unknown |
| H. 'Mary Marie Ann' Lawrence D. Englerth 1982 | R | SM | w>gr,blgre | | | 'Fortunei Aoki' sport |
| H. 'Mary Scholl' R. Lamlein 1999 | R | | gry,gre | | | 'Undulata Erromena' sport |
| H. 'Matilda' Rod Kuenster 2007 | R | | gr,crwe | | | 'Wahoo' hybrid |
| H. 'Matrix' Mark Zilis/C. Krabbe 2003 | R | SM | crw,gre | | | 'Francee' sport |
| H. 'Matthew Braedon' S. & S. Zolock 2006 | R | | dgr | | | "seedling" x "seedling" |
| H. 'Matthew J. Walton' S. Chamberlain 2001 | R | | dgr | | | 'Minuteman' hybrid |
| H. 'Maui Blue Surf' Ed Elslager 2004 | R | | | | | (x 'Lochness') selfed |
| H. 'Maui Buttercups' William P. Vaughn 1991 | R | SM | y | | | 'Frances Williams' x 'August Moon' |
| H. 'Maui Hana' William P. Vaughn 1991 | R | L | lgr | | | (x sieboldiana) x 'Golden Waffles' |
| H. 'Maui Rains' William P. Vaughn 1991 | R | M | dgr | | | 'Kabitan' x 'Saishu Jima' |
| H. 'May' Hans Hansen/ Shady Oaks Nursery 1999 | R | S | gry | | | 'June' sport |
| H. 'May Moon' Dick & Jane Ward 1999 | R | | y>gr | | | 'Blue Moon' hybrid |
| H. 'May T. Watts' T & Z Nursery/Mark R. Zilis 1985 | R | M | y,nawe | | | 'Golden Sunburst' sport |
| H. 'Maya' Meissner/A. Summers 1965/P. Ruh 1996 | R | S | y>gr,gre | | | 'Fortunei Albopicta' sport |
| H. 'Mayville' P. & J. Ruh 2003 | R | | y,blgre | | | 'Trail's End' sport |
| H. 'Me and My Shadow' Jim Schwarz 2003 | R | | lgr,blgre | | | 'Robert Frost' sport |
| H. 'Mean Mama' H. & D. Benedict 1995 | R | M | y,dgre | | | 'Dorothy Benedict' sport |
| H. 'Medieval Age' Alex Malloy 2004 | R | | | | | (x 'Galaxy') selfed |
| H. 'Medusa' R. Herold 1993 | R | D | crw,gre | | | 'Neat Splash' x gracillima |
| H. 'Megacup' E. Elslager 2000 | R | | str,gr,y | | | 'Sea Prize' x 'Maekawa' |
| H. 'Melissa Anne' J. Kerr 2000 | R | | str,gr,cr | | | 'Julie Morss' sport |
| H. 'Memento' G. Kamp 2001 | R | | grgo>go | | | 'Placemat' hybrid |
| H. 'Memories' Japan/H. Klose/P. Ruh 2002 | R | M | gagr,we | | | rectifolia hybrid |
| H. 'Memories of Dorothy' H. Gowen/H. Hansen 2002 | R | | gr,crye | R | | ('Dorothy Benedict' x pycnophylla) x montana 'Aureomarginata' |
| H. 'Mentor Gold' Wayside/Peter Ruh 1978 | R | S | y>gr | | | sieboldii sport |
| H. 'Merle' Van Wade 2007 | R | | dgr | | | 'Merle's Foundling' x 'Mount Kip' |
| H. 'Merlin' D. & J. Ward 2003 | R | | blgr,lye | | | 'Pin Stripe' hybrid |
| H. 'Merry Christmas' M. Zilis/M. Vanous 2003 | R | S | gr,crwe | | | 'White Christmas' sport |
| H. 'Merry Men' J. Schwarz 2002 | R | S | cr,gre | | | unknown |
| H. 'Merry Sunshine' E. Elslager 1998 | R | ML | gr,cre | | | 'Fascination' x hypoleuca |
| H. 'Merry-go-round' E. Elslager 1999 | R | | dgr | | | 'Herb Benedict' hybrid |
| H. 'Mesa Fringe' E. Minks/P. Ruh 2000 | R | L | gr | | | 'Regal Ruffles' sport |
| H. 'Mesa Verde' D. & J. Ward 2004 | R | | | | | montana f. macrophylla x 'Sagae' |
| H. 'Metallic Sheen' M. Zilis 1999 | R | L | blgr>dgr | | | 'Sum and Substance' x sieboldiana 'Elegans' |
| H. 'Metallica' William & Eleanor Lachman 1991 | R | M | dblgr | | | (x 'Beatrice') x 'Blue Moon' |
| H. 'Metropolis' G. Johnson 2004 | R | | | | | montana 'Chirifu' selfed |
| H. 'Michael T. Rozanski' S. Chamberlain 2004 | R | | | | | 'King Tut' seedling |
| H. 'Michael's Legacy' S. Zolock 1999 | R | | dgr,we | | | venusta 'Porter' x 'Craig's Temptation' |
| H. 'Michael's Mud Pie' S. Markland 2002 | R | | blgr | | | unknown |
| H. 'Michigan Gold' Ralph H. Benedict 1984 | R | M | y>ygr | | | 'August Moon' x 'Aspen Gold' |
| H. 'Midas Touch' Paul Aden 1978 | R | M | y | | | 'Gold Cup' x 'Golden Waffles' |
| H. 'Middle Ridge' Boonstra/Lewis/Ruh 1979 | R | M | gr,nawc | | | 'Undulata Univittata' sport |
| H. 'Midnight Express' Dick & Jane Ward 1996 | R | | blgr>gr | | | 'Sagae' hybrid |
| H. 'Midnight Moon' Bob Solberg 2005 | R | S | dgr,(y>cr)e | | | 'Lakeside Black Satin' sport |
| H. 'Midnight Oil' B. & D. Stegeman 2004 | R | | | | | 'Potomac Pride' x 'Neat Splash Rim' |
| H. 'Midnight Ride' Mark Zilis 2004 | R | | dgr | | | 'Paul Revere' sport |
| H. 'Midnight Storm' Bob Solberg 2005 | R | | dgr,str,y | | | 'Lakeside Black Satin' sport |
| H. 'Midnight Sun' Dick & Jane Ward 1996 | R | L | ygo | | | 'High Noon' x montana f. macrophylla |
| H. 'Midori-no-ya' Danny Van Eechaute 2004 | R | | gr | | | 'Koryu' sport |
| H. 'Midsummer Night's Green' Randy Goodwin 2006 | R | | gr | | | longipes var. latifolia seedling |
| H. 'Midwest Gold' Violet Cooley 1969 | R | L | y | | | 'Frances Williams' hybrid |
| H. 'Midwest Magic' Mark Zilis/Jim Schwarz 1999 | R | ML | y,dgre | | | 'Prairie Glow' sport |
| H. 'Midwest Majesty' Eldren W. Minks 1983 | R | L | ch,gr | | | 'Gold Regal' sport |
| H. 'Mighty Mite' Don Dean 2004 | R | | | | | 'Grand Slam' seedling |
| H. 'Mighty Mouse' Walters Gardens 2006 | R | D | blgr,(cr>w)e | | | 'Blue Mouse Ears' sport |
| H. 'Mikado' Paul Aden 1982 | R | VL | gr | | | montana 'Aureomarginata' x 'Big Sam' |
| H. 'Mikawa-no-yuki' H. Sugita/P. Ruh 1997 | R | SM | gr | RB | | kikutii x longipes |
| H. 'Mike Shadrack' B. Kuk 2001 | R | | gr,goe | | | 'Great Expectations' x 'Rock and Roll' |
| H. 'Miki' Peter Ruh/William W. Zumbar 1991 | R | ML | y | | | 'Hirao T66-01' x 'HiraoT66-02' |
| H. 'Mildred Seaver' Kevin C. Vaughn 1981 | R | ML | blgr,we | | | 'Breeders Choice' x 'Frances Williams' |
| H. 'Mildred's Smile' F. Nyikos 2007 | R | ML | y>gry | | | 'Mildred Seaver' seedling |
| H. 'Milk and Honey' P. Lynch 2003 | R | | gr,crwe | | | 'Sugar and Cream' sport |
| H. 'Millennium' J. & J. Wilkins 1995 | R | ML | blgr | | | 'Herb Benedict' x 'Sagae' |
| H. 'Millennium Magic' P. Lydon 1999 | R | | goy>gry | | | 'On Stage' hybrid |
| H. 'Millie's Memoirs' H. Hansen/Shady Oaks Nursery 1999 | R | M | gr,ye | | | 'Aspen Gold' sport |
| H. 'Million Dollar Baby' E. Elslager 2005 | R | | y,str,bl,gr | | | 'Heavenly Constellation' seedling |
| H. 'Ming Dynasty' Russ O'Harra/Russ O'Harra Hosta Society 1999 | R | L | blgr | | | unknown |
| H. 'Ming Jade' Ursula Syre-Herz 1987 | R | ML | dgr | | | unknown |
| H. 'Ming Treasure' Mark Zilis 1999 | R | M | gr,(cry>w)e | | Y+ | plantaginea sport |
| H. 'Mingo' Van Wade 2007 | R | | gr | | | unknown |
| H. 'Mini Mouse' Randy Goodwin 2006 | R | D | gagr | | | unknown |
| H. 'Minimoon' William & Eleanor Lachman 1992 | R | S | blgr | | | 'Blue Moon' selfed |
| H. 'Minna Blue' J. Ruh 1997 | R | | blgr | | | unknown |
| H. 'Minnesota Nice' Ron Snyder 1997 | R | M | (ch>gr),dgre | | | ventricosa 'Aureomaculata' sport |
| H. 'Minnesota Weather' Myrtle Kiehne 1980 | R | S | str,dgr,w | | | 'Francee' sport |
| H. 'Minnie Bell' Ralph H. Benedict 1985 | R | S | gr,cre | | | 'Neat Splash' selfed |
| H. 'Minnie Klopping' Minnie Klopping/Arett 1975 | R | SM | dgr | | | unknown |
| H. 'Mint Julep' Alex Malloy 2000 | R | M | gry,we | | | 'William Lachman' hybrid |
| H. 'Minuet' Bob Kuk 1990 | R | SM | gr,we | | | 'Crispula' sport |
| H. 'Minuteman' John L. Machen 1994 | R | SM | dgr,we | | | 'Francee' sport |
| H. 'Mira' F. Maekawa/G. Schmid/AHS 2002 | R | L | gr | | | unknown |
| H. 'Mirth' N. Matsubayashi/P. Ruh/J. Ruh 2001 | R | | lgr,gre | | | 'Happiness' hybrid |
| H. 'Mischief' Robyn Duback 1998 | R | L | blgr | | | unknown |
| H. 'Miss Grace' Arthur Wrede 2005 | R | | gr | R | | unknown |
| H. 'Miss Halley' L. Jones 2003 | R | | y,blgre | | | 'Winfield Blue' sport |
| H. 'Miss Linda Smith' Arthur Wrede 2006 | R | | blgr | PU | | unknown |
| H. 'Miss Maddie' N. Simes/R. Snyder 1999 | R | | str,dgr,y | | | 'Gloriosa' sport |
| H. 'Miss Missey' Arthur Wrede 2006 | R | | gr,spe,w | | Y+ | 'Sweet Susan' sport |
| H. 'Miss Ruby' Arthur Wrede 2005 | R | S | gr | R | | 'Katsuragawa Beni' hybrid |
| H. 'Miss Saigon' Hans Hansen/Shady Oaks Nursery 1999 | R | | dgr,cre | | Y | 'Fragrant Bouquet' sport |
| H. 'Miss Tokyo' H. Gowen/H. Hansen 2004 | R | | | | | 'Dorothy Benedict' x montana 'Aureomarginata' |
| H. 'Missie Mouse' K. Squires/P. Ruh 1996 | R | S | gr | | | unknown |
| H. 'Mississippi Delta' O. Petryszyn 1998 | R | L | blgr | | | 'Sea Gold' x 'Golden Torch' |
| H. 'Mississippi Gold' R. Simmering/M. Zilis 2003 | R | | goy | | | 'Sagae' hybrid |
| H. 'Mississippi Mud' R. Simmering 2000 | R | | blgr | | | 'Sagae' hybrid |
| H. 'Mississippi River' Doug Beilstein/Alex Malloy 2005 | R | L | ygr | | | 'Piecrust Power' x 'Elatior' |
| H. 'Missouri River' Doug Beilstein/Alex Malloy 2005 | R | | blgr | PU | | 'Raspberry Sorbet' x 'Riptide' |
| H. 'Missy' D. Heinz 1992 | R | S | y | | | 'Saishu Jima' hybrid |
| H. 'Mister Gee' M. Olson 1995 | R | | str,gr,bl,w | | | 'Crepe Suzette' x 'Blue Moon' |
| H. 'Mister Watson' L. Jones 1999 | R | M | y,dgre | | | 'King Tut' sport |
| H. 'Mistress Mabel' William & Eleanor Lachman 1995 | R | L | gr,cre | | Y | ('Beatrice' F6 x 'Blue Moon') x plantaginea |
| H. 'Misty Dawn' C. Helsley 2004 | R | | gr | | | 'Sand Pebbles' sport |
| H. 'Misty Gold' J. Dishon 1996 | R | L | str,gr,y | | | 'Gala' hybrid |
| H. 'Misty Mary Ann' Stuart Asch 2000 | R | | str,dgr,y | | | 'Dorothy Benedict' x (x 'Dorothy Benedict') |
| H. 'Misty Morning' Kuk's Forest 1986 | R | S | lgr | | | venusta hybrid |
| H. 'Misty Regal' J. & E. Stratton 1996 | R | ML | ygo,dgre | | | 'Gold Regal' sport |
| H. 'Misty Waters' Eunice V. Fisher/AHS 1986 | R | L | blgr>gr | | | sieboldiana hybrid |
| H. 'Moby Dick' K. Brill 1999 | R | VL | blgr | | | 'Sum and Substance' hybrid |
| H. 'Mogul' Robert P. Savory 1988 | R | M | gr | | | 'August Moon' x 'Tokudama' |
| H. 'Mohegan' S. Megos/A. Malloy 1998 | R | L | blgr | | | unknown |
| H. 'Molly' Tim Ruh/P. & J. Ruh 2005 | R | | gr,ye | | | 'Krossa Regal streaked' sport |
| H. 'Mom's Girl' Ed Elslager 2003 | R | | str,dgr,y,cr | | | ('Dorothy Benedict' F-1 seedling) hybrid |
| H. 'Mona Lisa' D. & J. Ward 2005 | R | | gr | | | unknown |
| H. 'Money Honey' Alex Malloy 2003 | R | | y | | | unknown |
| H. 'Monica's Golden Crinkles' K. Brill 1999 | R | | goy | | | unknown |
| H. 'Monkey Fist' C. Seaver 1999 | R | | str,gr,cr,w | | | unknown |
| H. 'Monopoly' Alex Malloy 1998 | R | DS | str,lgr,w | STR | | 'Pilgrim' sport |
| H. 'Monsoon' D. & J. Ward 2005 | R | | y,gre | | | 'Great Lakes Gold' sport |
| H. 'Monster Babe' E. Minks/A. Malloy 2000 | R | | blgr | | | 'Sea Monster' hybrid |
| H. montana 'Aureomarginata' Maekawa 1940/AHS 1987 | R | L | dgr,ye | | | montana sport |
| H. 'Montreal' Le Jardin Botanique de Montreal 1983 | R | SM | lgr | | | unknown |
| H. 'Montreal Blue Ice Storm' Van Wade 2007 | R | XL | blgr | | | (x 'Elegans') x (x 'Elegans') |
| H. 'Monument Circle' Clyde Crockett 1995 | R | | (y,gre)>gr | | | (x sieboldiana) sport |
| H. 'Mood Indigo' D. & J. Ward 1996 | R | | blgr | | | 'Tokudama Flavocircinalis' hybrid |
| H. 'Moon Glow' Ken Anderson 1977 | R | ML | y/ch,nawe | | | 'August Moon' hybrid |
| H. 'Moon Lily' Gretchen Harshbarger/Joyce Trott 1993 | R | M | y | | | unknown |
| H. 'Moon over Lake Erie' Pete Ruh /Mark Zilis 2005 | R | M | dgr,grye | | | 'August Moon' sport |
| H. 'Moon River' William & Eleanor Lachman 1991 | R | S | blgr,we | | | 'Crepe Suzette' x 'Blue Moon' |
| H. 'Moon Shadow' Robert P. Savory 1988 | R | S | cr/ch,gre | | | 'Butter Rim' hybrid |
| H. 'Moon Waves' M. Plater-Zyberk/R. Solberg 1994 | R | M | y | | | 'August Moon' hybrid |
| H. 'Moongate Flying Saucer' C. Isaacs/R. Solberg 1996 | R | SM | blgr | | | 'Serendipity' x 'Blue Blazes' |
| H. 'Moongate Little Dipper' C. Isaacs/R. Solberg 1996 | R | SM | dgr | | | 'Serendipity' x 'Blue Blazes' |
| H. 'Moonlight' Pauline Banyai 1977 | R | ML | y/ch,we | | | 'Gold Standard' sport |
| H. 'Moonlight Madness' H. Sugita/J. Ruh/P. Ruh 1999 | R | | go,ye | | | sieboldiana hybrid |
| H. 'Moonlight Mirage' Jim Schwarz 2002 | R | | gr,lgre | | | 'Moonlight Sonata' sport |
| H. 'Moonlight Sonata' Greg Johnson 2004 | R | ML | blgr | | Y | 'Invincible' x 'Northern Halo' |
| H. 'Moonshine' Robert P. Savory 1988 | R | L | ch | | | 'Piedmont Gold' sport |
| H. 'More Elegant' Josh Stadden 2001 | R | | blgr | | | "H. sieboldiana selection" sport |
| H. 'Morning Angel' Dennis Savory 2000 | R | M | dgr | | Y+ | 'Invincible' x 'Izumi' |
| H. 'Morning Glow' G. Johnson 2004 | R | | | | | 'Ming Dynasty' seedling |
| H. 'Morning Light' G. Van Eijk-Bos/Dirk Van Erven 2000 | R | M | y,dgre | | | 'Twilight' sport |
| H. 'Moscow Blue' Anne Arett/AHS 1986 | R | ML | blgr>dgr | | | unknown |
| H. 'Mother Lode' Ed Elslager 2003 | R | | str,dgr,y,w | | | 'Sea Prize' x 'Maekawa' |
| H. 'Mount Daisen' H. Sugita/P. & J. Ruh 2005 | R | XL | gr | | | montana selection |
| H. 'Mount Everest' J. Dishon 1996 | R | M | dgr,we | | | 'Sea Prize' x montana |
| H. 'Mount Fuji' Jim & Jill Wilkins 1989 | R | L | dgr>gr | | | montana 'Aureomarginata' hybrid |
| H. 'Mount Hood' Eldren W. Minks 1983 | R | M | gr,(gr>crw)e | | | unknown |
| H. 'Mount Hope' Janet Starnes Nursery 1992 | R | M | gr,(y>cre) | | | unknown |
| H. 'Mount Royal' Le Jardin Botanique de Montreal 1983 | R | SM | lgr | | | unknown |
| H. 'Mount Tom' William & Eleanor Lachman 1995 | R | ML | gr,we | | | 'Flamboyant' x 'Christmas Tree' |
| H. 'Mountain Dew' M. Zilis 2003 | R | L | go,we | | | 'Choko Nishiki' sport |
| H. 'Mountain Haze' Mark Zilis 1990 | R | M | y>cr,dgre | | | montana 'Aureomarginata' sport |
| H. 'Mountain Snow' T&Z Nursery/Mark Zilis 1988 | R | ML | gr,we | | | montana 'Aureomarginata' sport |
| H. 'Mountain Sunrise' M. Zilis 1999 | R | ML | y>gry | | | 'Choko Nishiki' sport |
| H. 'Mountaineer' B. Kuk/R. Torowski 2002 | R | ML | dgr | | | 'Rocky Mountain High' sport |
| H. 'Mourning Dove' Hans Hansen 2005 | R | | blgr,grye | | | 'Mikawa-no-yuki streaked' x 'Blue Jay' |
| H. 'Mr Blue' Arthur Wrede 2005 | R | | bl | PU | | 'Riptide' hybrid |
| H. 'Mrs Minky' P. Hall 1993 | R | S | y | | | minor x 'Piedmont Gold' |
| H. 'Muffie' Randy Goodwin 1996 | R | S | gr,we | | | 'Bravo' hybrid |
| H. 'Mumsie' N. Krul/P. Hiselman 1999 | R | | dgr | | | unknown |
| H. 'Munchkin' Mark Zilis 2003 | R | S | gr | | | 'Masquerade' sport |
| H. 'Muppett' Van Wade 2007 | R | | gry | | | unknown |
| H. 'Muriel Seaver Brown' Mildred Seaver 1984 | R | L | bl>gr | | | 'Wagon Wheels' hybrid |
| H. 'Murmurs' E. Minks/A. Malloy 2000 | R | | blgr | | | unknown |
| H. 'Murphy's Golden Marge' S. & S. Zolock 2001 | R | | goy | | | unknown |
| H. 'Mustang' A. Malloy 2002 | R | | gr | | | 'Spitfire' sport |
| H. 'Muted Moon' Peter Ruh 1995 | R | | dgr,che | | | 'August Moon' sport |
| H. 'Mutley's Rest' J. Orlando 2001 | R | | (lgr>yor),dgre | | | 'Great Expectations' sport |
| H. 'My Blue Heaven' P. Banyai/E. Elslager 1997 | R | | blgr | | | unknown |
| H. 'My Child Insook' H. & D. Benedict 1995 | R | L | w,dgre | | | 'Outrageous' sport |
| H. 'My Claire' Bob Hird 2005 | R | SM | gr,(y>cr)e | | | unknown |
| H. 'My Cup of Tea' E. Elslager 2002 | R | | gry,crwe | | | 'Sea Prize' x 'Maekawa' |
| H. 'My Darling' L. Clements 2001 | R | | lgr | | | 'Crepe Suzette' hybrid |
| H. 'My Fair Katie' E. Elslager 1998 | R | | gry | | | 'Sophistication' hybrid |
| H. 'My Friend Nancy' Ralph H. Benedict/N. Krul 1991 | R | ML | gr,we | | | 'Dorothy Benedict' x montana 'Chirifu' |
| H. 'My Heart' Van Wade 2007 | R | | gr | | | unknown |
| H. 'My Love Dorothy' H. & D. Benedict 1995 | R | M | w,blgre | | | 'Dorothy Benedict' selfed |
| H. 'My Marianne' Patrick Lydon 1999 | R | M | gr,cre | | | 'Amy Aden' x 'Filagree' |
| H. 'My Secret' R. Snyder 1999 | R | | gr,cre | | | unknown |
| H. 'Mystery Mom' E. Elslager 2005 | R | | blgr,str,y,cr | | | "unknown" sport |
| H. 'Mystic' Alex Malloy 2000 | R | | str,dgr,lgr | | | 'Whirlwind' hybrid |
| H. 'Mystic Star' Greg Johnson 2004 | R | | blgr | | | yingeri x 'Dorset Blue' |