Maryland Meadowbeauty
Maryland Milkwort
Maryland Sanicle
Maryland Senna
Mat Amaranth
Mat Sandbur
Matricary Grapefern
Matrimony Vine
Matted Sandmat
Matted Spikerush
Matting Rosette Grass
Maximilian Sunflower
Mayapple
Mayflower
Mayweed
Mazus
Meadow Alexanders
Meadow Evening Primrose
Meadow Fescue
Meadow Foxtail
Meadow Garlic
Meadow Hawkweed
Meadow Spikemoss
Meadow Zizia
Meadow-rue
Meadowbeauty
Meadowparsnip
Mecardonia
Meehania
Melic Mannagrass
Melicgrass
Melon
Melothria
Memorial Rose
Mercury Spurge
Mermaidweed
Mexican Dock
Mexican Groundcherry
Mexican Muhly
Mexican Plum
Mexican Tea
Miami Mist
Michigan Lily
Midland Sedge