| L
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| Laburnum anagyroides, Golden chain tree |
| Lactuca floridana, Florida lettuce; False lettuce |
| Lagenaria siceraria; Luffa cylindrica, Gourds; Bottle gourd; Calabash gourd |
| Lagerstroemia fauriei, Japanese crape myrtle |
| Lagerstroemia indica and hybrids, Dwarf crapemyrtle cultivars |
| Lagerstroemia indica, Crape myrtle |
| Lagurus ovatus, Hare's-tail grass |
| Lamium amplexicaule, Henbit |
| Lamium galeobdolon, Golden dead nettle; Yellow archangel |
| Lamium maculatum, Lamium; Dead nettle; Spotted dead nettle |
|
Lamium maculatum, Spotted dead nettle |
| Lamium purpureum, Purple dead-nettle |
| Lamium spp., Lamium; Dead nettle |
| Lantana camara, Common lantana |
| Lantana camara, Red sage; Yellow sage |
|
Lantana camera, Lantana |
| Lantana montevidensis, Weeping lantana |
| Lantana trifoliata, Three-leaved lantana; Lavender popcorn |
| Lapeirousia, Painted petals; Pink bermudiana |
| Larix kaempferi, Japanese larch |
| Lathrus latifolius, Everlasting pea |
| Lathyrus grandiflours, Everlasting pea; Two-flowered pea |
| Lathyrus latifolius, Everlasting pea; Perennial pea |
| Lathyrus latifolius, Everlasting pea |
| Lathyrus odoratus, Sweet pea |
| Laurentia fluviatilis, Laurentia |
| Lauris noblis, Sweet bay |
| Lauris noblis, True laurel; Bay laurel |
| Lavandula angustifolia, Common lavender; English lavender |
| Lavandula angustifolia, Lavender |
| Lavandula stoechas, French lavender |
| Lavandula x intermedia, Hybrid lavender |
| Lavatera trimestris, Tree mallow; Lavatera arborea |
| Leiophyllum buxifolium, Mountain myrtle; Sand myrtle |
| Leiophyllum buxifolium, Mountain myrtle; Sand myrtle |
| Lemna minor, Lesser duckweed |
| Lepisorus bicolor, Sechuan ribbon fern |
| Lespedeza bicolor, Shrub bushclover |
| Lespedeza thunbergii, Thunberg lespedeza |
| Lespedeza virginica, Bush clover |
| Leucojum aestivum, Summer Snowflake |
| Leucojum autumnale, Autumn snowflake |
| Leucothoe axillaris, Coastal leucothoe; Fetterbush; Doghobble |
| Leucothoe axillaris, Fetter-bush; Coastal leucothoe |
| Leucothoe fontanesiana (catesbali), Drooping leucothoe; Fetter bush; Doghobble |
| Leucothoe fontanesiana, Drooping leucothoe; Fetterbush; Doghobble |
| Leucothoe racemosa, Sweetbells leucothoe |
| Leucothoe recurvara, Leucothoe; Fetterbush |
| Leucothoe recurvara, Leucothoe; Fetterbush |
| Levisticum officinale, Lovage |
| Liatris pycnostachya, Prairie blazing stars |
| Liatris scariosa, Eastern blazing stars |
| Liatris scariosa, Large blazing stars; Large button-snakeroot |
|
Liatris spicata, Blazing stars; Gay feather; Snakeroot |
| Liatris squarrosa, Scaly liatris |
| Liatris, Blazing stars; Gay feather |
|
Ligularia stenocephala, Ligularia |
|
Ligularia tussilaginea, Leopard plant |
| Ligustrum japonicum, Japanese privet |
| Ligustrum lucidum, Waxleaf privet |
| Ligustrum sinense, Chinese privet |
| Ligustrum sinense, Chinese privet |
| Ligustrum x vicaryi, Vicary golden privet; Golden privet |
| Lilium candidum, Madonna lily |
| Lilium grayi, Gray's lily; Orange bell lily |
| Lilium michauxii, Carolina lily; Michaux's lily |
| Lilium philadelphicum , Wood lily; Nothern red lily |
| Lilium superbum, Turk's cap lily |
| Lilium, Asiatic hybrid lilies |
| Lilium, Oriental hybrid lilies |
|
Limonium latifolium, Sea lavender |
| Limonium sinuatum, Statice; Sea lavender |
|
Limonium spp., Statice |
| Linaria canadensis, Toad-flax |
| Linaria vulgaris, Butter and eggs; Yellow toadflax |
| Lindera angustifolia, Oriental spicebush |
| Lindera benzoin, Spice bush |
| Lindera benzoin, Spice bush |
| Lindera erythrocarpa -- |
| Lindera glauca, Grayblue spicebush |
| Lindera obtusiloba, Japanese Spicebush |
| Lindera obtusiloba, Japanese spicebush |
| Linum grandiflorum, Flowering flax |
|
Linum perenne, Perennial flax |
| Liparis lilifolia, Lily leaved twayblade; Large twayblade |
| Liquidambar formosana, Formosan sweetgum |
| Liquidambar styraciflua 'Gumball', Gumball sweetgum |
| Liquidambar styraciflua, Sweetgum |
| Liriodendron chinense, Chinese tulip tree |
| Liriodendron tulipifer, Tulip tree; Tulip poplar; Yellow poplar |
| Liriope exiliflora 'Silver Sunproof', Silver Sunproof liriope |
| Liriope muscaria, Liriope |
| Liriope spicata, Creeping liriope |
| Lithocarpus henryi, Henry tanbark oak |
| Lobelia cardinalis, Cardinal flower |
| Lobelia cardinalis, Cardinal flower |
| Lobelia erinus, Lobelia |
| Lobelia puberula, Downy lobelia |
| Lobelia siphilitica, Great lobelia |
| Lobelia spicata, Pale-spike lobelia; Spiked lobelia |
| Lobularia maritima, Sweet alyssum |
| Lonicera alseuosmoides, Honeysuckle |
| Lonicera fragrantissima, Winter honeysuckle |
| Lonicera japonica, Japanese honeysuckle |
| Lonicera nitida, Boxleaf honeysuckle |
| Lonicera periclymenum, Honeysuckle |
| Lonicera pileata, Privet honeysuckle |
| Lonicera sempervirens, Honeysuckle; Coral honeysuckle |
| Lonicera sempervirens, Trumpet honeysuckle |
| Lonicera sempervirens, Trumpet honeysuckle; Coral honeysuckle |
| Lonicera tatarica, Tatarian honeysuckle |
| Lonicera x brownii, Brown's honeysuckle; Scarlet trumpet honeysuckle |
| Lonicera x heckrottii, Goldflame honeysuckle |
| Lonicera x tellmanniana, Redgold honeysuckle |
| Lonicera xyiosteum, European fly honeysuckle |
| Loropetalum chinensis var. rubrum, Red leaf loropetalum |
| Loropetalum chinensis, Loropetalum |
| Ludwigia alternifolia, Seedbox |
| Ludwigia longifolia, Primrose willow |
| Ludwigia sidioides, Mosaic plant |
| Luffa cylindrica; Lagenaria siceraria, Gourds; Bottle gourd; Calabash gourd |
| Lupinus diffusus, Spreading lupine |
|
Lupinus spp., Lupine |
| Lupinus villosus, Hairy lupine; Lady lupine |
|
Lychnis chalcedonica, Maltese cross |
|
Lychnis coronaria, Rose campion |
| Lycoris aurea, Spider lily; Naked lily |
| Lycoris radiata, Spider lily; Naked lily |
|
Lycoris radiata; L. squamigera, Magic lily; Naked lily; Resurrection lily; Spider lily |
| Lygodium japonica, Japanese climbing fern |
| Lyonia ligustrina, Maleberry; Lyonia |
| Lyonia ligustrina, Maleberry; Lyonia |
| Lyonia lucida, Pink fetterbush |
| Lyonia lucida, Pink fetterbush; Fetterbush lyonia |
| Lysimachia ciliata, Fringed loosestrife |
|
Lysimachia clethroides, Gooseneck loosestrife |
| Lysimachia numularia, Creeping Jenny |
|
Lysimachia punctata, Yellow loosestrife |
| Lysimachia quadrifolia, Whorled loosestrife |
|
Lythrum salicaria, Purple loosestrife |