| Lagerstroemia speciosa | Lagerstroemia flos-reginae | 
| Lagunaria patersonii | Hibiscus patersonii | 
| Larrea tridentata | Larrea divaricatum subs. tridentata, Zygophyllum tridentatum, Covillea tridentata, Schroeterella tridentata, Neoschroetera tridentata, Larrea glutinosa | 
| Lawsonia inermis | Lawsonia alba | 
| Leonotis leonurus | Phlomis leonurus | 
| Leptospermum lanigerum | Leptospermum pubescens | 
| Leptospermum scoparium | Leptospermum floribundum | 
| Lespedeza bicolor | Desmodium bicolor | 
| Lespedeza thunbergii | Lespedeza formosa | 
| Lessertia frutescens | Sutherlandia frutescens | 
| Leucaena leucocephala | Leucaena glauca, Mimosa leucocephala, Acacia leucocephala | 
| Libertia formosa | Libertia chilensis | 
| Liparia splendens | Liparia sphaerica | 
| Liquidambar formosana | Liquidambar maximowiczii, Liqiudambar tonkinensis | 
| Lophostemon confertus | Tristania conferta | 
| Luculia gratissima | Chinchona gratissima | 
| Luffa acutangula | Luffa foetida | 
| Luffa cylindrica | Luffa aegyptica |