See ferns and allies
See trees, shrubs and woody vines
Wildflowers
| Lysimachia ciliata | Fringed Loosestrife | |
| L. nummularia | Moneywort, Creeping Jenny | |
| L. quadrifolia | Whorled Loosestrife | |
| L. tonsa | Southern Yellow Loosestrife | |
| Malaxis unifolia | Green Adder's Mouth | |
Marshallia obovata
 | Barbara's Buttons | A spring blooming composite of roadsides and open areas, frequently overlooked because other species are profusely blooming at the same time. |
| Matelea carolinensis | Carolina Milkvine | |
| M. decipiens | Glade Milkvine | |
| M. gonocarpa | Angle-pod | |
| Mecardonia acuminata | Axilflower | |
| Medeola virginiana | Indian Cucumber-root | |
| Medicago sativa | Alfalfa | |
| Melilotus albus | White Sweet Clover | |
| M. officinalis | Yellow Sweet Clover | |
| Melothria pendula | Guadalupe cucumber | |
| Menispermum canadense | Moonseed | |
| Mikania scandens | Climbing Hempvine, Climbing Boneset | |
| Mimulus alatus | Sharp Wing Monkey-flower | |
| M. ringens | Allegheny Monkey-flower | |
| Mitchella repens | Partridge Berry | |
| Mollugo verticilata | Carpet-weed | |
| Monarda fistulosa | Wild Bergamot | Pine-sap |
M. uniflora
 | Indian Pipe | This plant pops up overnight. Pale and shiny and without chlorophyll, it also merits its name of Corpse Plant. |
| Monotropsis odorata | Sweet Pine-sap | |
| Muscari racemosa | Grape Hyacinth | |
| Mysotis scorpioides | True Forget-me-not | |
| M. verna | Spring Forget-me-not | |
| Myosurus minimus | Mousetail | |
| Nasturtium officinale | Water Cress | |
| Nemophila microcalyx | Baby Blue-eyes | |
| Nuphar luteum | Spatter-dock, Yellow Pond-hly | |
| Obolaria virginica | Pennywort | |
| Oenothera biennis | Evening Primrose | |
| O. fruticosa | Narrow Leaf Evening Primrose, Sundrops | A common and underappreciated summer wildflower of fields, pastures and roadsides. |
| O. laciniata | Cutleaf Evening Primrose | |
| O. speciosa | Pink Ladies | |
Orchis spectabilis
 | Showy Orchis | Look for this unusual low growing orchid in low wet areas near streams in rich hardwood forests. |
| Ornithogalum umbellatum | Star Of Bethlehem | |
| Orobanche uniflora | Broomrape, Cancer-root | |
Orontium aquaticum
 | Golden Club | A waxy-leaved aquatic whose common name literally describes the bloom spike. The starchy roots were used by the natives for food. |
| Osmorhiza longistylis | Sweet Chervi, Licorice Rootl | |
| Oxalis stricta | Yellow Wood Sorrel | |
| O. violacea | Violet Wood Sorrel | |
| Panax quinquefolium | Ginseng, Sang | |
| Paronychia fastigiata | Hairy Forked Nail Wort | |
Parthenium integrifolium
 | Wild Quinine | Common name is derived from its use as a substitute for quinine in the treatment of urinary tract inflammations. |
| P. integrifolium auriculatum | Glade Wild Quinine | |
| Passiflora incarnata | Maypops, Purple Passion-flower | |
| P. lutea | Maypops, Yellow Passion-flower | |
| Pedicularis Canadensis | Wood-betony, Lousewort | |
