Lamarckia 
Large-headed Brome 
Lasiurus scindicus 
Lesser Pond Sedge 
Lesser quaking-grass 
Little bluestem 
Little Green Sedge 
Little Lovegrass 
Loliolum 
Lolium subulatum 
Longhair plume grass 
Maiden Silvergrass 
Maize 
Mangrove Grass 
Marsh Bristlegrass 
Marsh Club Rush 
Marsh Flatsedge 
Mat Sandbur 
Matgrass 
Mauritania Grass 
Meadow barley 
Meadow fescue 
Melica inaequiglumis 
Melica minuta