| M |
| Ma Perkins rose, Rosa 'Ma Perkins' |
| Mabella rose, Rosa 'KORgold' |
| Madame Ganna Walska water lily, Nymphaea 'Madame Ganna Walska' |
| Madame Hardy rose, Rosa 'Madame Hardy' |
| Madame Isaac Pereire rose, Rosa 'Madame Isaac Pereire' |
| Magic Carousel rose, Rosa 'MOORcar' |
| Magic Carpet rose, Rosa 'JAClover' |
| Magic Flower, Achimenes |
| Magic Meidland rose, Rosa 'MELbonrib' |
| Magnifica rose, Rosa rugosa magnifica |
| Magnolia, Bigleaf, Magnolia macrophylla |
| Magnolia, Cucumbertree, Magnolia acuminata |
| Magnolia, Fraser, Magnolia fraseri |
| Magnolia, Freeman, Magnolia x 'Freeman' |
| Magnolia, Kobus, Magnolia kobus |
| Magnolia, Lily, Magnolia liliflora |
| Magnolia, Little Gem, Magnolia grandiflora |
| Magnolia, Loebner, Magnolia x loebneri |
| Magnolia, Oyama, Magnolia sieboldii |
| Magnolia, Saucer, Magnolia x soulangiana |
| Magnolia, Southern, Magnolia grandiflora |
| Magnolia, Star, Magnolia stella |
| Magnolia, Swamp, Magnolia virginiana |
| Magnolia, Sweetbay, Magnolia virginiana |
| Magnolia, Umbrella, Magnolia tripetala |
| Magnolia, Yulan, Magnolia denudata = Magnolia heptapeta |
| Magnolias, Hybrid, Magnolia hybrids |
| Mahonia, Chinese, Mahonia fortunei |
| Mahonia, Creeping, Mahonia repens |
| Mahonia, Creeping, Mahonia repens |
| Mahonia, Leatherleaf, Mahonia bealei |
| Mahonia, Media, Mahonia x media |
| Mahonia, Wagner, Mahonia x wagneri |
| Maiden grass, Miscanthus sinensis 'Gracillimus' |
| Maiden's Blush rose, Rosa 'Maiden's Blush' |
| Maidenhair fern; Delta maidenhair; Pacific maidenhair, Adiantum raddianum |
| Maidenhair tree, Ginkgo biloba |
| Male fern, Dryopteris filix-mas |
| Maleberry, Lyonia ligustrina |
| Maleberry; Japanese ardisia, Ardisia japonica |
| Maleberry; Lyonia, Lyonia ligustrina |
| Mallow, Malope trifida |
| Mallow, Musk, Malva moschata |
| Mallow, Rose, Hibiscus moschuetos |
| Mallow, Seashore; Coastal mallow, Kosteletzkya virginica |
| Mallow, Swamp rose, Hibiscus moschuetos |
| Mallow, Swamp; Swamp rose-mallow; Wild cotton, Hibiscus moscheutos |
| Maltese cross, Lychnis chalcedonica |
| Mandarin, Nodding; Spotted disporum, Disporum maculatum |
| Mandarin, White; Twisted stalk, Streptopus amplexifolius |
| Mandevilla, Mandevilla splendens |
| Mandevilla, Mandevilla x amabalis |
| Mandrake, Podophyllum peltatum |
| Many Happy Returns rose, Rosa 'HARwanted' |
| Maple, Amur, Acer ginnala |
| Maple, Calk, Acer leucoderme = Acer saccharum ssp. leucoderme |
| Maple, Cappadocian, Acer cappadocicum |
| Maple, Coliseum, Acer cappadocicum |
| Maple, Coral bark Japanese, Acer palmatum 'Sangokaku' |
| Maple, Devil, Acer diabolicum |
| Maple, Fernleaf, Acer japonica f. aconitifolium |
| Maple, Florida, Acer barbatum (Acer saccharum ssp. floridanum) |
| Maple, Fullmoon, Acer japonicum |
| Maple, Hawthorn, Acer crataegifolium |
| Maple, Hedge, Acer campestre |
| Maple, Ivyleaved, Acer cissifolium |
| Maple, Japanese cultivar, Acer palmatum |
| Maple, Japanese strippedbark, Acer capillipes |
| Maple, Japanese, Acer palmatum |
| Maple, Mountain, Acer spicatum |
| Maple, Nikko, Acer nikoense |
| Maple, Norway, Acer platanoides |
| Maple, Painted, Acer mono = Acer truncatum subsp. mono |
| Maple, Paperbark, Acer griseum |
| Maple, Purple blow, Acer truncatum |
| Maple, Red, Acer rubrum |
| Maple, Redvein, Acer rufinerve |
| Maple, Silver, Acer saccharinum |
| Maple, Snakebark, Acer rufinerve |
| Maple, Southern sugar, Acer barbatum (Acer saccharum ssp. floridanum) |
| Maple, Stand Fast, Acer platanoides 'Stand Fast' |
| Maple, Sugar, Acer saccharum |
| Maple, Sycamore, Acer pseudoplatanus |
| Maple, Threeflower, Acer triflorum |
| Maple, Trident, Acer buergeranum |
| Maple, Whitebarked, Acer leucoderme = Acer saccharum ssp. leucoderme |
| Marchesa Boccella rose, Rosa 'Marchesa Boccella' |
| Margo Koster rose, Rosa 'Margo Koster' |
| Maria Callas rose, Rosa 'MELdaud' |
| Marie Curie rose, Rosa 'MELlomit' |
| Marie Pavic rose, Rosa 'Marie Pavie' |
| Marie Pavie rose, Rosa 'Marie Pavie' |
| Marie Pavier rose, Rosa'Marie Pavie' |
| Marie rose, Rosa 'AUSmary' |
| Marie van Houtte rose, Rosa 'Marie van Houtte' |
| Marigold, African, Tagetes erecta |
| Marigold, American, Tagetes erecta |
| Marigold, Aztec, Tagetes erecta |
| Marigold, Bur; Tickseed, Bidens aristosa |
| Marigold, French, Tagetes patula |
| Marigold, Marsh, Caltha palustris |
| Marigold, Signet, Tagetes temurfolia |
| Marigold, Tagetes erecta, T. patula |
| Marijke Koopman rose, Rosa 'Marijke Koopman' |
| Marina rose, Rosa 'rinaKOR' |
| Marjoram, Majorana hortensis |
| Marmalade Skies rose, Rosa 'MELmonblan' |
| Marquise Boccella rose, Rosa 'Marquise Boccella' |
| Marrow's sedge, Japanese sedge, Carex morrowii |
| Marsh marigold, Caltha palustris |
| Marshallia; Grass-leaf Barbara's button, Marshallia graminifolia |
| Mary rose, Rosa 'AUSmary' |
| Mary Wallace rose, Rosa 'Mary Wallace' |
| Mateo's Silk Butterflies rose, Rosa 'LETsilk' |
| Matilda rose, Rosa 'MELsoyris' |
| May-apple; Mandrake, Podophyllum peltatum |
| Mayflower, Canadian; False lily of the valley, Maianthemum canadense |
| Mayla water lily, Nymphaea 'Mayla' |
| Maypop, Passiflora incarnata |
| Maypops; Passion flower, Passiflora incarnata |
| McCartney rose, Rosa 'McCartney' |
| Meadow beauty, Rhexia virginica |
| Meadow clams; Venus' flytrap, Dionaea muscipula |
| Meadow rue, Thalictrum revolutum |
| Meadow-rue, Thalictrum aquilegifolium |
| Meadowsweet, Filipendula palmata |
| Mealy-cup sage, Salvia farinacea |
| Medallion rose, Rosa 'Medallion' |
| Meg rose, Rosa 'Meg' |
| Melampodium, Melampodium paludosum |
| Mermaid rose, Rosa 'Mermaid' |
| Mertensia; Virginia cowslip; Virginia bluebells, Mertensia virginica |
| Mexican cigar plant, Cuphea ignea |
| Mexican feather grass, Nassella tenuissima |
| Mexican heather, Cuphea hyssopifolia |
| Mexican ivy, Cobaena scandens |
| Mexican shell flowers, Tigridia |
| Mexican star, Milla |
| Mexican sunflower, Tithonia rotundifolia |
| Miami mist; Scorpionweed, Phacelia purshii |
| Midas Touch rose, Rosa 'JACtou' |
| Midnight water lily, Nymphaea 'Midnight' |
| Mikado rose, Rosa 'Mikado' |
| Milfoil, Achillea millefolium |
| Milfoil; Yarrow; Common yarrow, Achillea millefolium |
| Milk pea, Galactia regularis |
| Milk-vetch, Astragalus canadensis |
| Milkweed, Annual, Asclepias curassavica |
| Milkweed, Climbing, Matelea carolinensis |
| Milkweed, Common, Asclepias syriaca |
| Milkweed, Euphorbia corrllata |
| Milkweed, Four-leaved, Asclepias quadrifolia |
| Milkweed, Swamp, Asclepias incarnata |
| Milkwort, Curtiss'; Polygala, Polygala curtissii |
| Milkwort, Lanceolated; Asclepias, Asclepias lanceolata |
| Milkwort, Yellow; Orange milkwort, Polygala lutea |
| Mimosa, Kalkora, Albizia kalkora |
| Mimosa, Albizia julibrissin |
| Minima rose, Rosa 'Minima' |
| Minnie Pearl rose, Rosa 'SAVahowdy' |
| Miss All American Beauty rose, Rosa 'MELdaud' |
| Miss Harp rose, Rosa 'TANolg' |
| Miss Lawrence's rose, Rosa 'Miss Lawrence's Rose' |
| Missouri water lily, Nymphaea 'Missouri' |
| Mister Lincoln rose, Rosa 'Mister Lincoln' |
| Mistflower; Hardy ageratum; Wild ageratum, Eupatorium coelestium |
| Miterwort, False; Foamflower, Tiarella cordifolia |
| Miterwort; Bishop's cap; Two-leaf miterwort, Mitella diphylla |
| Mix 'n' Match rose, Rosa 'CHEWily' |
| Moccasin flower, Cypripedium spp. |
| Mock orange, Philadelphus inodorus; P. hirsutus |
| Mockorange, Fragrant, Philadelphus coronarius |
| Mockorange, Lemoine, Philadelphus x lemoinei |
| Mockorange, Philadelphus delavayi |
| Mockorange, Philadelphus inodorus; P. hirsutus |
| Mockorange, Polar Star, Philadelphus x 'Polar Star' |
| Mockorange, Snow Velvet, Philadelphus x 'Snow Velvet' |
| Mockorange, Sweet, Philadelphus coronarius |
| Mockorange, Virginal, Philadelphus x virginalis |
| Mon Cheri rose, Rosa 'AROcher' |
| Monastery bells, Cobaena scandens |
| Mondo grass, Black, Ophiopogon planiscapus 'Arabicus' |
| Mondo grass, Black, Ophiopogon planiscapus 'Arabicus' |
| Mondo grass, Dwarf, Ophiopogon japonicus 'Nana' |
| Mondo grass, Ophiopogon japonicus |
| Monkey flower, Mimulus ringens var. ringens |
| Monkey flower, Mimulus x hybridus |
| Monkshood, Aconitum spp. |
| Monkshood, Aconitum uncinatum |
| Monthly Pink rose, Rosa 'Monthly Pink' |
| Monthly rose, Rosa 'Monthly Rose' |
| Moon River rose, Rosa 'KORconta' |
| Moonflower, Ipomea alba, Calonyction aculeatum |
| Moonstone rose, Rosa 'WEKcryland' |
| Moonvine, Ipomea alba, Calonyction aculeatum |
| Moor grass, Blue, Sesleria caerulea |
| Moorei water lily, Nymphaea 'Moorei' |
| Moorousel rose, Rosa 'Moorousel' |
| Morning glory, Cypress vine, Ipomoea spp. |
| Morning glory, Dwarf, Convolulus tricolor |
| Morning glory, Ipomea purpurea, I. nil |
| Morning glory, Ipomoea tricolor |
| Morning glory; Cypress vine, Ipomoea spp. |
| Morning Light miscanthus, Miscanthus sinensis 'Morning Light' |
| Mosaic plant, Ludwigia sidioides |
| Moss phlox, Phlox subulata |
| Moss rose, Portulaca grandiflora |
| Moss-pink; Phlox, Moss, Phlox subulata |
| Moth mullein, Verbascum thapsus |
| Mother of thyme; Creeping thyme, Thymus praecox |
| Mother of thyme; Creeping thyme, Thymus serpyllum |
| Mothers Day rose, Rosa 'Fete des Meres' |
| Moudry, Panicum virgatum 'Moudry' |
| Mount Hood rose, Rosa 'MACmouhoo' |
| Mount Shasta water lily, Nymphaea 'Mount Shasta' |
| Mountain bluet, Centaurea montana |
| Mountain camellia, Stewartia ovata |
| Mountain holly, Ilex montana |
| Mountain laurel, Kalmia latifolia |
| Mountain maple, Acer spicatum |
| Mountain myrtle; Sand myrtle, Leiophyllum buxifolium |
| Mountain spleenwort; Maidenhair spleenwort, Asplenium trichomanes |
| Mountain-mint, Hoary, Pycnanthemum incanum |
| Mountain-mint, Narrow-leafed, Pycnanthemum tenuifolium |
| Mountain-mint, Short-toothed, Pycnanthemum muticum |
| Mountainash, American, Sorbus americana |
| Mountainash, European, Sorbus aucuparia |
| Mountainash, Korean, Sorbus alnifolia |
| Mousseline rose, Rosa 'Alfred de Dalmas' |
| Mr. A. Lincoln rose, Rosa 'Mister Lincoln' |
| Mrs. Aaron Ward rose, Rosa 'Mrs. Aaron Ward' |
| Mrs. Authur Robert Waddell rose, Rosa 'Mrs. Authur Robert Wadell' |
| Mrs. John Laing rose, Rosa 'Mrs. John Laing' |
| Mrs. Martin E. Randig water lily, Nymphaea 'Mrs. Martin E. Randig' |
| Mrs. Wakefield Christie-Miller rose, Rosa 'Mrs. Wakefiled Christie-Miller' |
| Mulberry, Contorted, Morus australis 'Unryo' |
| Mulberry, Red, Morus rubra |
| Mullard Jubilee rose, Rosa 'Electron' |
| Mullein, Verbascum spp. |
| Mullein, Woolly; Common mullein, Verbascum thapsus |
| Mullein, Woolly; Moth mullein, Verbascum thapsus |
| Mundi rose, Rosa 'Mundi' |
| Musclewood, Carpinus betulus |
| Musclewood, Carpinus caroliniana |
| Mustard, Chinese, Brassica juncea |
| Mutabilis rose, Rosa chinensis mutabillis |
| Mvenra grass; Ravenna grass; Hardy pampas grass, Erianthus ravennae |
| Myrtle, Mountain; Sand myrtle, Leiophyllum buxifolium |
| Myrtle, Sea, Baccharis halimifolia |
| Mysteria, Colchicum autumnale |