Mayweed          

Meadow Evening Primrose      

Meadow Fescue          

Meadow Foxtail      

Meadow Garlic          

Meadow Horsetail          

Meadow Willow          

Meadow Zizia          

Meadow-rue          

Meadowbeauty          

Meadowparsnip          

Melicgrass          

Mermaidweed          

Metaplexis          

Mexican Dock          

Mexican Groundcherry          

Mexican Lovegrass          

Mexican Mosquito Fern          

Mexican Muhly      

Mexican Plum          

Mexican Pricklypoppy          

Mexican Tea          

Mezereon          

Michigan Lily          

Midland Fawnlily          

Midland Sedge          

Mignonette          

Milkvetch          

Milkweed          

Milletgrass          

Minerslettuce          

Mint          

Mintleaf Bergamot      

Minute Duckweed          

Missouri Dewberry          

Missouri Foxtail Cactus          

Missouri Goldenrod      

Missouri Gooseberry          

Missouri Gourd      

Missouri Ironweed      

Missouri Lambsquarters          

Missouri Milkvetch          

Missouri River Willow      

Missouri Sedge