| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| LEGL18 | Lessingia glandulifera Gray | valley lessingia | Asteraceae
|
| LEHOA | Lessingia hololeuca Greene var. arachnoidea (Greene) J.T. Howell | Lessingia arachnoidea | Asteraceae
|
| LEHO | Lessingia hololeuca Greene | woollyhead lessingia | Asteraceae
|
| LELEL | Lessingia lemmonii Gray var. lemmonii | Lemmon's lessingia | Asteraceae
|
| LELEP | Lessingia lemmonii Gray var. peirsonii (J.T. Howell) Ferris | Peirson's lessingia | Asteraceae
|
| LELER2 | Lessingia lemmonii Gray var. ramulosissima (A. Nels.) Ferris | Lemmon's lessingia | Asteraceae
|
| LELE13 | Lessingia lemmonii Gray | Lemmon's lessingia | Asteraceae
|
| LELE7 | Lessingia leptoclada Gray | Sierra lessingia | Asteraceae
|
| LEMIA | Lessingia micradenia Greene var. arachnoidea (Greene) Ferris | Lessingia arachnoidea | Asteraceae
|
| LEMIG | Lessingia micradenia Greene var. glabrata (Keck) Ferris | smooth lessingia | Asteraceae
|
| LEMIM | Lessingia micradenia Greene var. micradenia | Mt. Tamalpais lessingia | Asteraceae
|
| LEMI5 | Lessingia micradenia Greene | Mt. Tamalpais lessingia | Asteraceae
|
| LENA | Lessingia nana Gray | dwarf lessingia | Asteraceae
|
| LENEA | Lessingia nemaclada Greene var. albiflora (Eastw.) J.T. Howell | slenderstem lessingia | Asteraceae
|
| LENEM | Lessingia nemaclada Greene var. mendocina (Greene) J.T. Howell | Mendocino lessingia | Asteraceae
|
| LENEN | Lessingia nemaclada Greene var. nemaclada | slenderstem lessingia | Asteraceae
|
| LENE3 | Lessingia nemaclada Greene | slenderstem lessingia | Asteraceae
|
| LEOC8 | Lessingia occidentalis (Hall) M.A. Lane | Benitoa occidentalis | Asteraceae
|
| LERAA | Lessingia ramulosa Gray var. adenophora (Greene) Gray | Sonoma lessingia | Asteraceae
|
| LERAG | Lessingia ramulosa Gray var. glabrata Keck | Lessingia micradenia var. glabrata | Asteraceae
|
| LERAM | Lessingia ramulosa Gray var. micradenia (Greene) J.T. Howell | Lessingia micradenia var. micradenia | Asteraceae
|
| LERAR | Lessingia ramulosa Gray var. ramulosa | Sonoma lessingia | Asteraceae
|
| LERA3 | Lessingia ramulosa Gray | Sonoma lessingia | Asteraceae
|
| LETE8 | Lessingia tenuis (Gray) Coville | spring lessingia | Asteraceae
|
| LEVIG | Lessingia virgata Gray var. glomerata (Greene) J.T. Howell | wand lessingia | Asteraceae
|
| LEVIV | Lessingia virgata Gray var. virgata | wand lessingia | Asteraceae
|
| LEVI8 | Lessingia virgata Gray | wand lessingia | Asteraceae
|
| LESSI | Lessingia Cham. | lessingia | Asteraceae
|
| LECA53 | Letharia californica (Lev.) Hue | Letharia columbiana | Parmeliaceae
|
| LECO26 | Letharia columbiana (Nutt.) J. W. Thomson | wolf lichen | Parmeliaceae
|
| LEVU2 | Letharia vulpina (L.) Hue | wolf lichen | Parmeliaceae
|
| LETHA | Letharia (Th. Fr.) Zahlbr. | wolf lichen | Parmeliaceae
|
| LECU7 | Lethariicola cucularis (Norman) Lumbsch & D. Hawksw. | | Odontotremataceae
|
| LESE11 | Lethariicola sepei Grummann | Lethariicola cucularis | Odontotremataceae
|
| LETHA2 | Lethariicola Grummann | lethariicola | Odontotremataceae
|
| LEDO7 | Letrouitia domingensis (Pers.) Hafeller & Bellem. | | Letrouitiaceae
|
| LEPA26 | Letrouitia parabola (Nyl.) R. Sant. & Hafellner | | Letrouitiaceae
|
| LEVU3 | Letrouitia vulpina (Tuck.) Hafellner & Bellem. | | Letrouitiaceae
|
| LETRO | Letrouitia Hafellner & Bellem. | letrouitia | Letrouitiaceae
|
| LECL4 | Lettauia cladoniicola D. Hawksw. & R. Sant. | | Fuscideaceae
|
| LESA19 | Lettauia santessonii Ihlen & Tonsberg | | Fuscideaceae
|
| LETTA | Lettauia D. Hawksw. & R. Sant. | lettauia | Fuscideaceae
|
| LECY | Leucacantha cyanus (L.) Nieuwl. & Lunell | Centaurea cyanus | Asteraceae
|
| LEGL5 | Leucaena glauca auct. non (L.) Benth. | Leucaena leucocephala | Fabaceae
|
| LELA39 | Leucaena latisiliqua (L.) Gillis & Stearn | Lysiloma latisiliquum | Fabaceae
|
| LELE10 | Leucaena leucocephala (Lam.) de Wit | white leadtree | Fabaceae
|
| LEPU3 | Leucaena pulverulenta (Schlecht.) Benth. | great leadtree | Fabaceae
|
| LERE5 | Leucaena retusa Benth. | littleleaf leadtree | Fabaceae
|
| LEUCA | Leucaena Benth. | leadtree | Fabaceae
|
| LENE6 | Leucampyx newberryi Gray | Hymenopappus newberryi | Asteraceae
|
| LESO10 | Leucantha solstitialis (L.) A.& D. L�ve | Centaurea solstitialis | Asteraceae
|
| LESE6 | Leucanthemella serotina (L.) Tzvelev | giantdaisy | Asteraceae
|
| LEUCA5 | Leucanthemella Tzvelev | leucanthemella | Asteraceae
|
| LEAR29 | Leucanthemum arcticum (L.) DC. | Dendranthema arcticum ssp. arcticum | Asteraceae
|
| LEIN4 | Leucanthemum integrifolium (Richards.) DC. | entireleaf daisy | Asteraceae
|
| LELA10 | Leucanthemum lacustre (Brot.) Samp. | Portuguese daisy | Asteraceae
|
| LELE12 | Leucanthemum leucanthemum (L.) Rydb. | Leucanthemum vulgare | Asteraceae
|
| LEMA8 | Leucanthemum maximum (Ramond) DC. | max chrysanthemum | Asteraceae
|
| LENI2 | Leucanthemum nipponicum Franch. ex Maxim. | Nippon daisy | Asteraceae
|
| LESE8 | Leucanthemum serotinum (L.) Stankov | Leucanthemella serotina | Asteraceae
|
| LESU49 | Leucanthemum �superbum (J.W. Ingram) Berg. ex Kent. | | Asteraceae
|
| LEVUP | Leucanthemum vulgare Lam. var. pinnatifidum (Lecoq & Lamotte) Moldenke | Leucanthemum vulgare | Asteraceae
|
| LEVU | Leucanthemum vulgare Lam. | oxeye daisy | Asteraceae
|
| LEUCA4 | Leucanthemum P. Mill. | daisy | Asteraceae
|
| LEMA7 | Leucas martinicensis (Jacq.) Ait. f. | whitewort | Lamiaceae
|
| LEUCA3 | Leucas R. Br. | leucas | Lamiaceae
|
| LEER | Leucelene ericoides (Torr.) Greene | Chaetopappa ericoides | Asteraceae
|
| LEAL35 | Leucobryum albidum (Brid. ex P. Beauv.) Lindb. | leucobryum moss | Leucobryaceae
|
| LEAN16 | Leucobryum antillarum Schimp. ex Besch. | leucobryum moss | Leucobryaceae
|
| LEGL19 | Leucobryum glaucum (Hedw.) �ngstr. in Fries | leucobryum moss | Leucobryaceae
|
| LEUCO9 | Leucobryum Hampe | leucobryum moss | Leucobryaceae
|
| LEOC3 | Leucococcus occidentalis Liebm. | Pouzolzia occidentalis | Urticaceae
|
| LEAL7 | Leucocoma alpina (L.) Rydb. | Trichophorum alpinum | Cyperaceae
|
| LEAL5 | Leucocraspedum albicaule (Dougl. ex Griseb.) Rydb. | Frasera albicaulis var. albicaulis | Gentianaceae
|
| LEAL6 | Leucocraspedum albomarginatum (S. Wats.) Rydb. | Frasera albomarginata | Gentianaceae
|
| LEMO7 | Leucocraspedum montanum (Mulford) Rydb. | Frasera montana | Gentianaceae
|
| LEMO4 | Leucocrinum montanum Nutt. ex Gray | common starlily | Liliaceae
|
| LEUCO | Leucocrinum Nutt. ex Gray | starlily | Liliaceae
|
| LEBRA | Leucodon brachypus Brid. var. andrewsianus Crum & Anderson | Andrews' lecodon moss | Leucodontaceae
|
| LEBRB | Leucodon brachypus Brid. var. brachypus | leucodon moss | Leucodontaceae
|
| LEBR12 | Leucodon brachypus Brid. | leucodon moss | Leucodontaceae
|
| LEJU4 | Leucodon julaceus (Hedw.) Sull. | leucodon moss | Leucodontaceae
|
| LESC9 | Leucodon sciuroides auct. Amer. | Leucodon brachypus var. andrewsianus | Leucodontaceae
|
| LEUCO10 | Leucodon Schwaegr. | leucodon moss | Leucodontaceae
|
| LEFL19 | Leucodontopsis floridana (Aust.) Britt. | Henicodium geniculatum | Pterobryaceae
|
| LEGE6 | Leucodontopsis geniculata (Mitt.) Crum & Steere | Henicodium geniculatum | Pterobryaceae
|
| LEAEA | Leucojum aestivum L. ssp. aestivum | summer snowflake | Liliaceae
|
| LEAEP | Leucojum aestivum L. ssp. pulchellum (Salisb.) Briq. | summer snowflake | Liliaceae
|
| LEAE | Leucojum aestivum L. | summer snowflake | Liliaceae
|
| LEVE3 | Leucojum vernum L. | spring snowflake | Liliaceae
|
| LEUCO2 | Leucojum L. | snowflake | Liliaceae
|
| LECL7 | Leucolejeunea clypeata (Schwein.) A. Evans | | Lejeuneaceae
|
| LECO45 | Leucolejeunea conchifolia A. Evans | | Lejeuneaceae
|
| LEUN3 | Leucolejeunea unciloba (Lindenb.) A. Evans | | Lejeuneaceae
|
| LEXA5 | Leucolejeunea xanthocarpa (Lehm. & Lindenb.) A. Evans | | Lejeuneaceae
|
| LEUCO8 | Leucolejeunea A. Evans | | Lejeuneaceae
|
| LEAC8 | Leucolepis acanthoneuron (Schwaegr.) Lindb. | leucolepis umbrella moss | Mniaceae
|
| LEME20 | Leucolepis menziesii (Hook.) Steere in L. Koch | Leucolepis acanthoneuron | Mniaceae
|
| LEUCO11 | Leucolepis Lindb. | leucolepis umbrella moss | Mniaceae
|
| LECA12 | Leucophyllum candidum I.M. Johnston | Brewster County barometerbush | Scrophulariaceae
|
| LEFR3 | Leucophyllum frutescens (Berl.) I.M. Johnston | Texas barometer bush | Scrophulariaceae
|