Gynerium 
Hairy Woodland Brome 
Hakone Grass 
Halfa Grass 
Halopyrum 
Hardgrass 
Hares-tail 
Hares-tail cottongrass 
Heath Wood-Rush 
Hemarthria altissima 
Heteranthelium 
Hooked Bristle Grass 
Hordeum bulbosum 
Imperata Cylindrical 
Incense grass 
Indiangrass 
Ivory sedge 
Japanese stiltgrass 
Jobs tears 
Jointleaf rush 
Joinvillea borneensis 
Juncus subulatus 
Kangaroo Grass 
Knobby Club-rush