| Lachnanthes caroliniana (Lam.) Dandy | map | images (1) (2) (3) (4) |
| Lachnocaulon anceps (Walt.) Morong | map | images (1) (2) |
| Lachnocaulon beyrichianum Sporleder ex Koern. | map | |
| Lachnocaulon minus (Chapman) Small | map | images (1) (2) |
| Lactuca canadensis L. | map | images (1) (2) |
| Lactuca floridana (L.) Gaertn. | map | |
| Lactuca graminifolia Michx. | map | |
| Lactuca hirsuta Muhl. ex Nutt. | map | |
| Lactuca saligna L. | map | |
| Lactuca serriola L. | map | images (1) (2) (3) |
| Lagerstroemia indica L. | map | images (1) |
| Lamium amplexicaule L. | map | images (1) (2) |
| Lamium purpureum L | map | images (1) (2) |
| Lantana camara L. | map | images (1) |
| Lantana depressa Small | map | |
| Lantana urticoides Hayek | map | |
| Laportea canadensis (L.) Weddell | map | images (1) (2) |
| Lathyrus hirsutus L. | map | |
| Lathyrus latifolius L. | map | |
| Lathyrus venosus Muhl. ex Willd. | map | |
| Lechea minor L. | map | |
| Lechea mucronata Raf. | map | |
| Lechea pulchella Raf. | map | |
| Lechea racemulosa Michx. | map | |
| Lechea sessiliflora Raf. | map | |
| Lechea tenuifolia Michx. | map | images (1) (2) (3) (4) |
| Lechea torreyi Leggett ex Britt. | map | |
| Leersia hexandra Sw. | map | |
| Leersia lenticularis Michx. | map | |
| Leersia oryzoides (L.) Sw. | map | images (1) (2) (3) (4) |
| Leersia virginica Willd. | map | |
| Leiophyllum buxifolium (Berg.) Ell. | map | images (1) (2) (3) |
| Lemna aequinoctialis Welw. | map | |
| Lemna obscura (Austin) Daubs | map | |
| Lemna perpusilla Torr. | map | |
| Lemna valdiviana Phil. | map | |
| Leonotis nepetifolia (L.) Ait. f. | map | images (1) |
| Leonurus cardiaca L. | map | images (1) (2) (3) |
| Lepidium campestre (L.) Ait. f. | map | |
| Lepidium virginicum L. | map | images (1) (2) |
| Leptochloa fascicularis (Lam.) Gray | map | |
| Leptochloa mucronata (Michx.) Kunth. | map | |
| Leptochloa uninervia (J. Presl) A.S. Hitchc. & Chase | map | |
| Lepuropetalon spathulatum Ell. | map | |
| Lespedeza angustifolia (Pursh) Ell. | map | |
| Lespedeza bicolor Turcz. | map | images (1) (2) |
| Lespedeza capitata Michx. | map | |
| Lespedeza cuneata (Dum.-Cours.) G. Don. | map | images (1) (2) |
| Lespedeza hirta (L.) Hornem. | map | |
| Lespedeza intermedia (S. Wats.) Britt. | map | images (1) (2) (3) |
| Lespedeza procumbens Michx. | map | |
| Lespedeza repens (L.) W. Bart. | map | images (1) (2) |
| Lespedeza stuevei Nutt. | map | |
| Lespedeza thunbergii (DC.) Nakai | map | |
| Lespedeza violacea (L.) Pers. | map | |
| Lespedeza virginica (L.) Britt. | map | |
| Lespedeza x nuttallii Darl. | map | |
| Leucanthemum lacustre (Brot.) Samp. | map | |
| Leucanthemum vulgare Lam. | map | |
| Leucojum aestivum L. | map | |
| Leucothoe axillaris (Lam.) D. Don | map | images (1) (2) (3) |
| Leucothoe fontanesiana (Steud.) Sleumer | map | |
| Leucothoe racemosa (L.) Gray | map | images (1) (2) (3) |
| Leucothoe recurva (Buckl.) Gray | map | |
| Liatris aspera Michx. | map | |
| Liatris cokeri Pyne & Stucky | map | images (1) (2) (3) |
| Liatris elegans (Walt.) Michx. | map | images (1) (2) |
| Liatris gracilis Pursh | map | |
| Liatris graminifolia Willd. | map | |
| Liatris microcephala (Small) K. Schum. | map | |
| Liatris scariosa (L.) Willd. | map | |
| Liatris secunda Ell. | map | |
| Liatris spicata (L.) Willd. var. resinosa (Nutt.) Gaiser | map | |
| Liatris spicata (L.) Willd. var. spicata | map | |
| Liatris squarrosa (L.) Michx. | map | images (1) (2) |
| Liatris squarrulosa Michx. | map | |
| Liatris tenuifolia Nutt. | map | |
| Licania michauxii Prance | map | |
| Ligusticum canadense (L.) Britt. | map | |
| Ligustrum amurense Carr. | map | |
| Ligustrum japonicum Thunb. | map | images (1) |
| Ligustrum sinense Lour. | map | images (1) (2) (3) (4) (5) |
| Lilaeopsis carolinensis Coult. & Rose | map | |
| Lilaeopsis chinensis (L.) Kuntze | map | |
| Lilium canadense L. | map | |
| Lilium catesbaei Walt. | map | |
| Lilium michauxii Poir. | map | |
| Lilium superbum L. | map | images (1) |
| Limnobium spongia (Bosc) L.C. Rich. ex Steud. | map | |
| Limonium carolinianum (Walt.) Britt. | map | images (1) (2) (3) |
| Linaria vulgaris P. Mill. | map | |
| Lindera benzoin (L.) Blume | map | |
| Lindera melissifolia (Walt.) Blume | map | |
| Lindera subcoriacea B.E. Wofford | map | |
| Lindernia crustacea (L.) F. Muell. | map | |
| Lindernia dubia (L.) Pennell var. anagallidea (Michx.) Cooperrider | map | |
| Lindernia dubia (L.) Pennell var. dubia | map | images (1) (2) (3) (4) |
| Lindernia monticola Muhl ex Nutt. | map | images (1) (2) (3) |
| Linum floridanum (Planch.) Trel. | map | images (1) |
| Linum medium (Planch.) Britt. | map | |
| Linum striatum Walt. | map | |
| Linum usitatissimum L. | map | |
| Linum virginianum L. | map | |
| Liparis liliifolia (L.) L.C. Rich ex Ker-Gawl. | map | |
| Lipocarpha aristulata (Coville) G. Tucker | map | |
| Lipocarpha maculata (Michx.) Torr. | map | |
| Lipocarpha micrantha (Vahl) G. Tucker | map | |
| Liquidambar styraciflua L. | map | images (1) |
| Liriodendron tulipifera L. | map | images (1) (2) (3) |
| Liriope muscari (Dcne.) Bailey | map | |
| Listera australis Lindl. | map | |
| Listera smallii Wieg. | map | |
| Lithospermum caroliniense (Walt. ex J.F. Gmel.) MacM. | map | images (1) |
| Lithospermum tuberosum Rugel ex DC. | map | |
| Litsea aestivalis (L.) Fern. | map | images (1) (2) |
| Lobelia amoena Michx. var. amoena | map | |
| Lobelia amoena Michx. var. glandulifera Gray | map | |
| Lobelia boykinii Torr. & Gray ex A.DC. | map | |
| Lobelia canbyi Gray | map | images (1) |
| Lobelia cardinalis L. | map | images (1) (2) |
| Lobelia elongata Small | map | |
| Lobelia glandulosa Walt. | map | images (1) (2) (3) (4) |
| Lobelia inflata L. | map | images (1) (2) (3) |
| Lobelia nuttallii J.A. Schultes | map | images (1) (2) |
| Lobelia puberula Michx. | map | |
| Lobelia spicata Lam. | map | |
| Lolium perenne L. ssp. multiflorum (Lam.) Husnot | map | images (1) (2) |
| Lolium perenne L. ssp. perenne | map | |
| Lonicera flava Sims | map | |
| Lonicera fragrantissima Lindl. & Paxton | map | images (1) |
| Lonicera japonica Thunb. | map | images (1) (2) (3) |
| Lonicera maackii (Rupr.) Maxim. | map | |
| Lonicera morrowii Gray | map | |
| Lonicera sempervirens L. | map | images (1) (2) |
| Lonicera x bella Zabel | map | |
| Lotus helleri Britt. | map | |
| Ludwigia alata Ell. | map | |
| Ludwigia alternifolia L. | map | images (1) (2) (3) (4) |
| Ludwigia arcuata Walt. | map | |
| Ludwigia bonariensis (M. Micheli) Hara | map | |
| Ludwigia brevipes (B.H. Long ex Britt., A. Braun & Small) Eames | map | |
| Ludwigia decurrens Walt. | map | images (1) |
| Ludwigia glandulosa Walt. | map | |
| Ludwigia hirtella Raf. | map | |
| Ludwigia leptocarpa (Nutt.) Hara | map | |
| Ludwigia linearis Walt. | map | images (1) |
| Ludwigia linifolia Poir. | map | |
| Ludwigia maritima Harper | map | |
| Ludwigia microcarpa Michx. | map | |
| Ludwigia palustris (L.) Ell. | map | |
| Ludwigia peploides (Kunth) Raven ssp. glabrescens (Kuntze) Raven | map | |
| Ludwigia pilosa Walt. | map | |
| Ludwigia pilosa x L. sphaerocarpa | map | |
| Ludwigia ravenii Peng | map | |
| Ludwigia repens J.R. Forst. | map | |
| Ludwigia spathulata Torr. & Gray | map | |
| Ludwigia sphaerocarpa Ell. | map | |
| Ludwigia sphaerocarpa x L. pilosa | map | |
| Ludwigia suffruticosa Walt. | map | |
| Ludwigia uruguayensis (Camb.) Hara | map | |
| Ludwigia virgata Michx. | map | |
| Lupinus diffusus Nutt. | map | images (1) (2) (3) |
| Lupinus perennis L. | map | images (1) (2) |
| Lupinus villosus Willd. | map | images (1) (2) (3) (4) |
| Luziola fluitans (Michx.) Terrell & H. Robins. | map | |
| Luzula acuminata Raf. var. carolinae (S. Wats.) Fern. | map | |
| Luzula bulbosa (Wood) Smyth & Smyth | map | |
| Luzula echinata (Small) F.J. Herm. | map | |
| Lychnis coronaria (L.) Desr. | map | |
| Lycium barbarum L. | map | |
| Lycopersicon esculentum P. Mill. | map | images (1) (2) (3) |
| Lycopodiella alopecuroides (L.) Cranfill | map | images (1) (2) (3) |
| Lycopodiella appressa (Chapman) Cranfill | map | |
| Lycopodiella prostrata (Harper) Cranfill | map | |
| Lycopodiella x copelandii (Eig.) Cranfill | map | |
| Lycopodium clavatum L. | map | |
| Lycopodium obscurum L. | map | images (1) |
| Lycopus americanus Muhl. ex W. Bart. | map | |
| Lycopus amplectens Raf. | map | |
| Lycopus cokeri Ahles ex Sorrie | map | |
| Lycopus rubellus Moench | map | images (1) (2) |
| Lycopus uniflorus Michx. | map | |
| Lycopus virginicus L. | map | |
| Lycoris radiata (L'Her.) Herbert | map | images (1) (2) (3) |
| Lygodium japonicum (Thunb.) Sw. | map | images (1) (2) (3) |
| Lygodium palmatum (Bernh.) Sw. | map | |
| Lyonia ferruginea (Walt.) Nutt. | map | images (1) (2) (3) |
| Lyonia ligustrina (L.) DC. | map | |
| Lyonia lucida (Lam.) K. Koch | map | images (1) (2) (3) |
| Lyonia mariana (L.) D. Don | map | images (1) (2) (3) |
| Lysimachia asperulifolia Poir. | map | |
| Lysimachia ciliata L. | map | |
| Lysimachia fraseri Duby | map | |
| Lysimachia hybrida Michx. | map | |
| Lysimachia lanceolata Walt. | map | |
| Lysimachia loomisii Torr. | map | |
| Lysimachia nummularia L. | map | images (1) |
| Lysimachia quadrifolia L. | map | images (1) (2) |
| Lysimachia terrestris (L.) B.S.P. | map | |
| Lythrum alatum Pursh var. lanceolatum (Ell.) Torr. & Gray ex Rothrock | map | images (1) (2) |
| Lythrum lineare L. | map | |