Madder, Blue Field Sherardia arvensis Bedstraw (Madder)
Magnolia, star Magnolia stellata Magnolia
Mallow, Common/ Cheeses Malva neglecta Mallow
Mallow, European (see Mallow, large-flowered)
Mallow, hollyhock (see Mallow, large-flowered)
Mallow, large-flowered Malva alcea Mallow
Mallow, Musk Mallow moschata Mallow
Mallow, vervain (see Mallow, large-flowered)
Man-of-the-earth (see Potato-Vine, Wild)
Mandarin, yellow Disporum lanuginosum Lily
Mandrake (see May-Apple/ Mandrake)
Maple, ashleaf (see Boxelder)
Maple, big leaf Acer macrophyllum Maple
Maple, black Acer nigrum Maple
Maple, Hard (see Maple, Sugar)
Maple, Norway Acer platanoides Maple
Maple, Oregon (see Maple, big leaf)
Maple, Red Acer rubrum Maple
Maple, Rock (see Maple, Sugar)
Maple, Scarlet (see Maple, Red)
Maple, Silver Acer saccarinum Maple
Maple, Soft (see Maple, Silver)
Maple, striped Acer pensylvanicum Maple
Maple, Sugar Acer saccharum Maple
Maple, Swamp (see Maple, Red)
Maple, White (see Maple, Silver)
Marguerite (see Daisy, English/ Garden Daisy/ Marguerite)
Masterwort Imperatoria ostruthium Parsley
May-Apple/ Mandrake Podophyllum peltatum Barberry
Mayflower (see Arbutus, Trailing)
Mayweed Anthema cotula Composite
Maze-gill, oak Daedalea quercina Mushrooms With Pores (Polypores)
Mazegill, birch Lenzites betulina Mushrooms With Pores (Polypores)
Meadow mushroom Agaricus campestris Gilled Mushrooms
Meadow mushroom, false Agaricus andrewii Gilled Mushrooms
Meadow-rue, Early Thalictrum dioicum Buttercup
Meadow-Rue, Tall Thalictrum polygamum Buttercup
Meadowsweet, Broad-Leaved Spiraea latifolia Rose
Meadowsweet, Narrow-Leaf Spiraea alba Rose
Mealy forked lichen Cladonia scabriuscula Lichen
Mealy osette lichen Physcia millegrana Lichen
Mealy rosette lichen Physcia millegrana Lichen
Meehania Meehania cordata Mint
Mercury, Three-Seeded Acalpha virginica Spurge
Merry-Bells, Big (see Bellwort, Large-flowered/ Big Merrybells)
Merry-Bells, Little (see Oats, Wild/ Sessile Bellwort/ Little Merrybells)
Mertensia (see Bluebells, Virginia/ Virginia Cowslip/ Mertensia)
Merulius, trembling (see Woodcrust, gelatinous)
Mica cap Coprinellus micaceus Gilled Mushrooms
Milfoil (see Yarrow/Milfoil)
Milkweed, Common Asclepias syriaca Milkweed
Milkweed, Four-Leaved Asclepias quadrifolia Milkweed
Milkweed, Poke Asclepias exaltata Milkweed
Milkweed, Swamp Asclepias incarnata Milkweed
Mint, Apple/ Round-Leaved Mint Mentha rotundifolia Mint
Mint, Crisp-Leaved (see Mint, Curled/ Crisp-Leaved Mint)
Mint, Curled/ Crisp-Leaved Mint Mentha crispa Mint
Mint, Field (see Mint, Wild/ Field Mint)
Mint, Round-Leaved (see Mint, Apple/ Round-Leaved Mint)
Mint, Wild/ Field Mint Mentha arvensis Mint
Mistflower/ Blue Boneset Eupatorium coelestinium Joe-Pye-Weed-Like
Miterwort, False (see Foamflower)
Miterwort/ Bishop's Cap Mitella diphylla Saxifrage
Moccasin-Flower (see Lady's-Slipper, Pink/ Moccasin-Flower)
Mock Orange, garden Philadelphus coronarius Saxifrage
Mock oyster, orange (see Nestcap)
Moneywort Lysimachia nummularia Primrose
Monkey-Flower, Square-Stemmed Mimulus ringens Snapdragon (Figwort)
Moonseed, Canada Menispermum canadense Moonseed
Moosewood (see Maple, striped)
Morel, common Morchella esculenta Miscellaneous Fungi
Morel, true Miscellaneous Fungi
Morning Glory, Common Ipomoea purpurea Morning Glory
Morning Glory, Ivy-Leaved Ipomoea hederacea Morning Glory
Morning Glory, Wild (see Bindweed, Hedge/ Wild Morning Glory)
Motherwort Leonuris cardiaca Mint
Mountain-Mint, Slender Pychnanthemum flexuosum Mint
Mugwort, Common Artemisia vulgaris No Obvious Symmetry
Mugwort, Western/ White Sage Artemisia ludoviciana No Obvious Symmetry
Mulberry, Red Morus rubra Mulberry
Mulberry, Silkworm (see Mulberry, White)
Mulberry, White Morus alba Mulberry
Mullein, Common Verbascum thapsis Snapdragon (Figwort)
Mullein, Moth Verbascum blatteria Snapdragon (Figwort)
Mustard, Black Brassica nigra Mustard
Mustard, Field Brassica campestris Mustard
Mustard, Garlic Aliaria officinalis Mustard
Mustard, Tumble Sisymbrium altissimum Mustard
Myrtle (see Periwinkle/ Myrtle)
Magnolia acuminata
Magnolia stellata
Liriodendron tulipifera
Hibiscus trionum
Alcea rosea
Malva neglecta
Malva alcea
Mallow moschata
Hibiscus syriacus
Hibiscus palustris, forma peckii
Hibiscus palustris
Abutilon theophrasti
Acer negundo
Acer macrophyllum
Acer nigrum
Acer platanoides
Acer rubrum
Acer saccarinum
Acer pensylvanicum
Acer saccharum
Asclepias tuberosa
Asclepias syriaca
Asclepias quadrifolia
Asclepias exaltata
Asclepias incarnata
Satureja vulgaris
Monarda didyma
Monarda fistulosa
Ajuga reptans
Ajuga genevensis
Lycopus virginicus
Nepeta cataria
Lamium purpureum
Cunila origonoides
Teucrium canadense
Glecoma hereracea
Prunella vulgaris
Stachys tenuifolia
Galeopsis tetrahit
Lamium amplexicaule
Collinsonia canadensis
Mentha longifolia
Meehania cordata
Mentha rotundifolia
Mentha crispa
Mentha arvensis
Leonuris cardiaca
Pychnanthemum flexuosum
Physostegia virginiana
Hedoma pulegioides
Mentha piperita
Scutellaria incana
Scutellaria ovata
Scutellaria leterifolia
Scutellaria epilobiifolia
Scutellaria parvula
Mentha spicata
Lycopus americanus
Blephila hirsuta
Menispermum canadense
Convolvulus arvensis
Convolvulus sepium
Convolvulus spithamaeus
Cuscuta gronovii
Ipomoea purpurea
Ipomoea hederacea
Ipomoea pandurata
Morus rubra
Morus alba
Maclura pomifera
Lobularia maritime
Cardamine pensylvanica
Brassica kaber
Lepidium campestre
Rorippa sylvestris
Sisymbrium thalianum
Cardamine douglassii
Cardamine bulbosa
Barbarea vulgaris
Rorippa islandica
Hesperis matronalis
Sisymbrium officinale
Lunaria annua
Brassica nigra
Brassica campestris
Aliaria officinalis
Sisymbrium altissimum
Thlaspi arvense
Lepidium virginicum
Capsella bursa-pastoris
Dentaria laciniata
Dentaria diphylla
Brassica rapa, subspecies sylvestris
Draba verna