L
- Lablab purpureus (I)
- Lactuca biennis (N)
- Lactuca canadensis (N)
- Lactuca floridana var. floridana (N)
- Lactuca floridana var. villosa (N)
- Lactuca hirsuta var. sanguinea (N)
- Lactuca × morssii (N)
- Lactuca saligna (I)
- Lactuca sativa (I)
- Lactuca serriola (I)
- Lactuca tatarica var. pulchella (N)
- Lamium album (I)
- Lamium amplexicaule (I)
- Lamium maculatum (I)
- Lamium purpureum var. purpureum (I)
- Laportea canadensis (N)
- Lappula squarrosa (I)
- Lapsana communis (I)
- Larix laricina (N)
- Lathyrus japonicus var. maritimus (N)
- Lathyrus japonicus var. parviflorus (N)
- Lathyrus latifolius (I)
- Lathyrus ochroleucus (N)
- Lathyrus odoratus (I)
- Lathyrus palustris (N)
- Lathyrus pratensis (I)
- Lathyrus tuberosus (I)
- Lathyrus venosus (N)
- Leavenworthia uniflora (N)
- Lechea intermedia var. intermedia (N)
- Lechea minor (N)
- Lechea mucronata (N)
- Lechea pulchella var. moniliformis (N)
- Lechea pulchella var. pulchella (N)
- Lechea racemulosa (N)
- Lechea tenuifolia (N)
- Ledum groenlandicum (N)
- Leersia lenticularis (N)
- Leersia oryzoides (N)
- Leersia virginica (N)
- Lemna minor (N)
- Lemna minuta (N)
- Lemna obscura (N)
- Lemna perpusilla (N)
- Lemna trisulca (N)
- Lemna turionifera (N)
- Lemna valdiviana (N)
- Leontodon autumnalis ssp. autumnalis (I)
- Leontodon autumnalis ssp. pratensis (I)
- Leontodon hispidus ssp. danubialis (I)
- Leontodon taraxacoides ssp. taraxacoides (I)
- Leonurus cardiaca ssp. cardiaca (I)
- Leonurus sibiricus (I)
- Lepidium campestre (I)
- Lepidium densiflorum var. densiflorum (N)
- Lepidium perfoliatum (I)
- Lepidium ramosissimum var. bourgeauanum (N)
- Lepidium ruderale (I)
- Lepidium sativum (I)
- Lepidium virginicum var. virginicum (N)
- Leptochloa fusca ssp. fascicularis (N)
- Leptochloa panicea ssp. brachiata (N)
- Lespedeza × acuticarpa (N)
- Lespedeza bicolor (I)
- Lespedeza × brittonii (N)
- Lespedeza capitata (N)
- Lespedeza cuneata (I)
- Lespedeza formosa (I)
- Lespedeza frutescens (N)
- Lespedeza hirta ssp. hirta (N)
- Lespedeza × nuttallii (N)
- Lespedeza procumbens (N)
- Lespedeza repens (N)
- Lespedeza thunbergii (I)
- Lespedeza violacea (N)
- Lespedeza virginica (N)
- Lesquerella globosa (N)
- Leucanthemum maximum (I)
- Leucanthemum vulgare (I)
- Leucojum aestivum ssp. aestivum (I)
- Leucospora multifida (N)
- Levisticum officinale (I)
- Liatris aspera var. aspera (N)
- Liatris aspera var. intermedia (N)
- Liatris cylindracea (N)
- Liatris punctata var. punctata (N)
- Liatris pycnostachya var. pycnostachya (N)
- Liatris scariosa var. nieuwlandii (N)
- Liatris spheroidea (N)
- Liatris spicata var. spicata (N)
- Liatris squarrosa var. squarrosa (N)
- Liatris squarrulosa (N)
- Ligusticum canadense (N)
- Ligustrum obtusifolium (I)
- Ligustrum ovalifolium (I)
- Ligustrum vulgare (I)
- Lilium canadense ssp. canadense (N)
- Lilium canadense ssp. editorum (N)
- Lilium lancifolium (I)
- Lilium michiganense (N)
- Lilium philadelphicum var. andinum (N)
- Lilium philadelphicum var. philadelphicum (N)
- Lilium superbum (N)
- Linaria dalmatica ssp. dalmatica (I)
- Linaria genistifolia (I)
- Linaria vulgaris (I)
- Lindera benzoin var. benzoin (N)
- Lindera benzoin var. pubescens (N)
- Lindernia dubia var. anagallidea (N)
- Lindernia dubia var. dubia (N)
- Linnaea borealis ssp. americana (N)
- Linum grandiflorum (I)
- Linum medium var. texanum (N)
- Linum perenne (I)
- Linum perenne (N)
- Linum striatum (N)
- Linum sulcatum var. sulcatum (N)
- Linum usitatissimum (I)
- Linum virginianum (N)
- Liparis liliifolia (N)
- Liparis loeselii (N)
- Lipocarpha drummondii (N)
- Lipocarpha micrantha (N)
- Liquidambar styraciflua (N)
- Liriodendron tulipifera (N)
- Lithospermum canescens (N)
- Lithospermum caroliniense var. croceum (N)
- Lithospermum latifolium (N)
- Lithospermum officinale (I)
- Lobelia cardinalis (N)
- Lobelia inflata (N)
- Lobelia kalmii (N)
- Lobelia puberula var. simulans (N)
- Lobelia siphilitica var. siphilitica (N)
- Lobelia spicata var. campanulata (N)
- Lobelia spicata var. leptostachys (N)
- Lobelia spicata var. spicata (N)
- Lobularia maritima (I)
- Lolium perenne ssp. multiflorum (I)
- Lolium perenne ssp. perenne (I)
- Lolium temulentum ssp. temulentum (I)
- Lonicera × bella (I)
- Lonicera canadensis (N)
- Lonicera dioica (N)
- Lonicera flava (N)
- Lonicera fragrantissima (I)
- Lonicera japonica (I)
- Lonicera × minutiflora (I)
- Lonicera morrowii (I)
- Lonicera maackii (I)
- Lonicera oblongifolia (N)
- Lonicera reticulata (N)
- Lonicera ruprechtiana (I)
- Lonicera × salicifolia (I)
- Lonicera sempervirens (N)
- Lonicera tatarica (I)
- Lonicera villosa var. tonsa (N)
- Lonicera × xylosteoides (I)
- Lonicera xylosteum (I)
- Lotus corniculatus var. corniculatus (I)
- Lotus glaber (I)
- Ludwigia alternifolia (N)
- Ludwigia decurrens (N)
- Ludwigia leptocarpa (N)
- Ludwigia palustris (N)
- Ludwigia peploides (I)
- Ludwigia peploides ssp. glabrescens (N)
- Ludwigia polycarpa (N)
- Lunaria annua (I)
- Lupinus perennis ssp. perennis var. occidentalis (N)
- Lupinus perennis ssp. perennis var. perennis (N)
- Lupinus perennis ssp. perennis (N)
- Luzula acuminata ssp. acuminata (N)
- Luzula acuminata ssp. carolinae (N)
- Luzula bulbosa (N)
- Luzula echinata (N)
- Luzula multiflora ssp. multiflora var. multiflora (N)
- Luzula multiflora ssp. multiflora (N)
- Lychnis coronaria (I)
- Lychnis flos-cuculi (I)
- Lychnis viscaria (I)
- Lycium barbarum (I)
- Lycium chinense (I)
- Lycopodiella inundata (N)
- Lycopodiella margueritiae (N)
- Lycopodiella subappressa (N)
- Lycopodium clavatum (N)
- Lycopodium dendroideum (N)
- Lycopodium digitatum (N)
- Lycopodium × habereri (N)
- Lycopodium hickeyi (N)
- Lycopodium lagopus (N)
- Lycopodium obscurum (N)
- Lycopodium tristachyum (N)
- Lycopus americanus (N)
- Lycopus asper (N)
- Lycopus europaeus (I)
- Lycopus rubellus (N)
- Lycopus × sherardii (N)
- Lycopus uniflorus var. uniflorus (N)
- Lycopus virginicus (N)
- Lycoris squamigera (I)
- Lygodium palmatum (N)
- Lyonia ligustrina var. ligustrina (N)
- Lysimachia ciliata (N)
- Lysimachia lanceolata (N)
- Lysimachia nummularia (I)
- Lysimachia × producta (N)
- Lysimachia punctata (I)
- Lysimachia quadriflora (N)
- Lysimachia quadrifolia (N)
- Lysimachia terrestris (N)
- Lysimachia thyrsiflora (N)
- Lysimachia vulgaris (I)
- Lythrum alatum var. alatum (N)
- Lythrum hyssopifolium (I)
- Lythrum portula (I)
- Lythrum salicaria (I)
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