| Scientific Name | Common Name(s) | Life History | Growth Form | |
|---|---|---|---|---|
| Ligustrum sinense 'Sunshine' | Sunshine Ligustrum, Sunshine Privet | Perennial | shrub | |
| Ligustrum vulgare | Privet, Common privet, European privet | Perennial | shrub | |
| Lilium szovitsianum | lily, species lily, wild lily, crimson-anthered lily, tall sulphur-flowered lily , Caucasian lily | Perennial | forb | |
|
Limonium duriusculum | European sea lavendar | Perennial | forb |
|
Limonium macrophyllum | Limonium macrophyllum | Perennial | shrub |
|
Limonium otolepis | Asian sea lavender, saltmarsh sea lavender | Perennial | forb |
|
Limonium perezii | Perez's sea lavender | Perennial | forb |
|
Limonium ramosissimum | Algerian sea lavender | Perennial | forb |
| Limonium sinuatum | Wavyleaf sealavender, Statice, notchleaf sea-lavender, perennial sea-lavender | Perennial | forb | |
| Linum perenne | blue flax, perennial flax | Perennial | forb | |
| Linum trigynum | French flax, slender yellow flax | Annual | forb | |
| Liriope muscari 'Variegata' | Lilyturf, Blue lily turf | Perennial | grass | |
|
Liriope spicata | creeping liriope | Perennial | forb |
| Lonicera caerulea 'Cinderella' | Sweetberry Honeysuckle, Fly Honeysuckle, Haskap | Perennial | shrub | |
| Lonicera caerulea 'Tundra' | Sweetberry Honeysuckle, Fly Honeysuckle, Haskap | Perennial | shrub | |
|
Lonicera fragrantissima | sweet breath of spring | Perennial | shrub |
|
Lonicera japonica | Japanese honeysuckle | Perennial | vine |
|
Lonicera maackii | Amur honeysuckle, bush honeysuckle | Perennial | shrub |
| Lonicera tataricum 'Honeyrose' | Honeyrose Honeysuckle | Perennial | shrub | |
| Loropetalum chinense | Chinese fringe-flower | Perennial | shrub | |
| Loropetalum chinense var. rubrum 'Sato's Dwarf Red' | Chinese fringe-flower | Perennial | shrub | |
|
Lotus angustissimus | slender bird's-foot trefoil , narrow-leaf lotus, narrow-leaf trefoi | Annual | forb |
|
Ludwigia decurrens | wingleaf primrose-willow, winged water-primrose | Annual | forb |
| Lychnis coronaria | Rose campion, Dusty-miller, Mullein-pink | Perennial | forb | |
|
Lygeum spartum | false esparto grass, albardine, lygeum, esperato grass, alvarde | Perennial | grass |