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| Common Name | Scientific Name | |
| Madder, Field | Sherardia arvensis | |
| Mallow, Common | Malva neglecta | |
| Mallow, Venice | Hibiscus trionum | |
| Mandrake | Podophyllum peltatum | |
| Marijuana | Cannabis sativa | |
| Marsh Dayflower | Murdannia keisak | |
| Marsh Pennywort | Hydrocotyle umbellata | |
| Mary's Grass | Microstegium vimineum | |
| Mayapple | Podophyllum peltatum | |
| Maypop Passionflower | Passiflora incarnata | |
| Mayweed Chamomile | Anthemis cotula | |
| Mazus, White Flowered | Mazus japonicus | |
| Mouseear Hawkweed | Hieracium pilosella | |
| Microstegium | Microstegium vimineum | |
| Milkweed, Butterfly | Asclepias tuberosa | |
| Milkweed, Common | Asclepias syriaca | |
| Milkweed, Honeyvine | Ampelamus albidus | |
| Milkweed, Swamp | Aslepias incarnata | |
| Millet, Browntop | Brachiaria ramosa | |
| Millet, Wild-Proso | Panicum miliaceum | |
| Mimosa | Albizia julibrissin | |
| Mint, Perilla | Perilla frutescens | |
| Morningglory, Bigroot | Ipomoea pandurata | |
| Morningglory, Cotton | Ipomoea cordatotriloba* | |
| Morningglory, Cypressvine | Ipomoea quamoclit | |
| Morningglory, Entireleaf | Ipomoea hederacea ** | |
| Morningglory, Ivyleaf | Ipomoea hederacea | |
| Morningglory, Palmleaf | Ipomoea wrightii | |
| Morningglory, Pitted | Ipomoea lacunosa | |
| Morningglory, Red | Ipomoea coccinea | |
| Morningglory, Smallflower | Jacquemontia tamnifolia | |
| Morningglory, Tall | Ipomoea purpurea | |
| Moss Pink | Phlox subulata | |
| Mouse-ear Chickweed | Cerastium vulgatum | |
| Mouse-ear Cress | Arabidopsis thaliana | |
| Mouseear Hawkweed | Hieracium pilosella | |
| Mugwort | Artemisia vulgaris | |
| Mullein, Common | Verbascum thapsus | |
| Mullein, Moth | Verbascum blattaria | |
| Multiflora Rose | Rosa multiflora | |
| Musk-grass | Chara spp. | |
| Musk Thistle | Carduus nutans | |
| Mustard, Garlic | Allaria petiolata | |
| Mustard, Hedge | Sisymbrium officinale | |
| Mustard, Wild | Brassica kaber | |
| * The full scientific name is Ipomoea cordatotriloba var. torreyana | ||
| ** The full scientific name is Ipomoea hederacea var. integriuscula | ||
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