Lachnagrostis lachnantha (Nees) Rúgola & Molina
Lachnagrostis phleoides Nees & Meyen – basionym of Gastridium phleoides (Nees & Meyen) C.E. Hubb.
Lagurus cylindricus Linn. – basionym of Imperata cylindrica (Linn.) P.Beauv.
Lamarckia aurea (Linn.) Moench
Lappago phleoides Fig.& De Not. – synonym of Tragus berteronianus Schult.
Lasiutus hirsutus Boiss. – invalid name of Lasiurus scindicus Henrard
Latipes senegalense Kunth – basionym of Leptothrium senegalense (Kunth) W.D.Clayton
Leersia angustifolia Munro ex Prodoehl
Leersia tisserantii (A. Chev.) Launert
Lepargochloa glabra Gledhill – basionym of Rhytachne glabra (Gledhill) Clayton
Lepidopironia cenchriformis A. Rich. – basionym of Tetrapogon cenchriformis (A. Rich.) W.D. Clayton
Leptaspis cochleata – synonym of Leptaspis zeylanica Nees
Leptaspis conchifera – synonym of Leptaspis zeylanica Nees
Leptocarydion vulpiastrum (De Not.) Stapf
Leptochloa coerulescens Steud.
Leptochloa filiformis (Lam.) P. Beauv. – synonym of Leptochloa mucronata (Michx.) Kunth
Leptochloa fusca (Linn.) Kunth – synonym of Diplachne fusca (Linn.) P. Beauv. ex Roem. & Schult.
Leptochloa leptostachya K. Schum. – basionym of Cynodon plectostachyus (K. Schum.) Pilg.
Leptochloa malabarica (Linn.) Veldk. – synonym of Diplachne fusca (Linn.) P. Beauv. ex Roem. & Schult.
Leptochloa mollis Kunth – basionym of Trichoneura mollis (Kunth) Ekman
Leptochloa mucronata (Michx.) Kunth
Leptochloa obtusiflora Hochst. – basionym of Disakisperma obtusiflorum (Hochst.) Peterson & Snow
Leptochloa panicea (Retz.) Ohwi
Leptochloa uniflora Hochst. ex A. Rich. – basionym of Trigonochloa uniflora (Hochst. ex A. Rich.) Peterson & Snow
Leptothrium senegalense (Kunth) W.D.Clayton
Lepturella aristata Stapf – basionym of Oropetium aristatum (Stapf) Pilg.
Lepturopsis triaristata Steud. – basionym of Rhytachne triaristata (Steud.) Stapf
Lepturus minimus Hochst. – basionym of Oropetium minimum (Hochst.) Pilg.
Lintonia nutans Stapf – basionym of Chloris nutans (Stapf) Peterson
Lolium gaudinii Parl. – synonym of Lolium multiflorum Lam.
Lolium multiflorum rigidum (Gaudin) Trab. – synonym of Lolium rigidum Gaudin
Lolium perenne rigidum (Gaudin) Ross. & Drlieu – synonym of Lolium rigidum Gaudin
Lolium strictum J. Presl. – synonym of Lolium rigidum Gaudin
Lophochloa cristata (Linn.) Hyl. – synonym of Rostraria cristata (Linn.) Tevelev
Lophochloa pumila (Desf.) Bor – synonym of Rostraria pumila (Desf.) Tevelev
Lophochloa rohlfsii (Achsers.) Scholz – synonym of Rostraria rohlfsii (Achsers.) Holub
Loudetia angolensis C.E. Hubb.
Loudetia annua (Stapf) Hubbard
Loudetia arundinacea (A. Rich.) Steud.
Loudetia cerata (Stapf) C.E. Hubb.
Loudetia coarctata (Camus) C.E. Hubb.
Loudetia echinulata C.E. Hubb.
Loudetia flavida (Stapf) C.E. Hubb.
Loudetia hordeiformis (Stapf) C.E. Hubb.
Loudetia kagerensis (K. Schum.) C.E. Hubb.
Loudetia phragmitoides (Peter) C.E. hubb.
Loudetia simplex (Nees) C.E. Hubb.
Loudetia superba De Not. – basionym of Tristachya superba (De Not.) Schweinf. & Aschers.
Loudetia thoroldii – synonym of Loudetiopsis thoroldii (Hubbard) Phipps
Loudetia tisserantii C.E. Hubb.
Loudetia togoensis (Pilger) C.E. Hubb.
Loudetia villosipes – synonym of Loudetiopsis glabrata (K. Schum.) Conert
Loudetiopsis ambiens (K. Schum.) Conert
Loudetiopsis baldwinii (C.E. Hubb.) J.B. Phipps
Loudetiopsis capillipes (C.E. Hubb.) Conert
Loudetiopsis chevalieri (Stapf) Conert
Loudetiopsis chrysothrix (Nees) Conert
Loudetiopsis falcipes (C.E. Hubb.) Phipps
Loudetiopsis glabrata (K. Schum.) Conert
Loudetiopsis kerstingii (Pilger) Conert
Loudetiopsis scaettae (A. Camus) Clayton
Loudetiopsis thoroldii (Hubbard) Phipps
Loudetiopsis trigemina (C.E. Hubb.) Conert
Loudetiopsis villosipes – synonym of Loudetiopsis glabrata (K. Schum.) Conert
Louisiella fluitans C.E.Hubbard & Leonard
Loxodera ledermannii (Pilg.) Launert
Loxodera strigosa (Gledhill) Clayton
Lycurus muticus Spreng. – basionym of Elionurus muticus (Sprengel) Kunth