| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| LEVE2 | Lendneria verticillata (P. Mill.) Britt. | Stemodia verticillata | Scrophulariaceae
|
| LETE4 | Lenophyllum texanum (J.G. Sm.) Rose | coastal stonecrop | Crassulaceae
|
| LENOP | Lenophyllum Rose | lenophyllum | Crassulaceae
|
| LECU2 | Lens culinaris Medik. | lentil | Fabaceae
|
| LEES | Lens esculenta Moench | Lens culinaris | Fabaceae
|
| LENS | Lens P. Mill. | lentil | Fabaceae
|
| LELA42 | Leochilus labiatus (Schwartz) Kuntze | lipped orchid | Orchidaceae
|
| LEPU5 | Leochilus puertoricensis Chase | Puerto Rico smoothlip orchid | Orchidaceae
|
| LEOCH | Leochilus Knowles & Westc. | leochilus | Orchidaceae
|
| LELE3 | Leonotis leonurus (L.) Ait. f. | lion's ear | Lamiaceae
|
| LENE | Leonotis nepetifolia (L.) Ait. f. | Christmas candlestick | Lamiaceae
|
| LEONO | Leonotis (Pers.) Ait. f. | lion's ear | Lamiaceae
|
| LEAUA | Leontodon autumnalis L. ssp. autumnalis | fall dandelion | Asteraceae
|
| LEAUP2 | Leontodon autumnalis L. ssp. pratensis (Link) Arcang. | fall dandelion | Asteraceae
|
| LEAUP | Leontodon autumnalis L. var. pratensis (Link) W.D.J. Koch | Leontodon autumnalis ssp. pratensis | Asteraceae
|
| LEAU2 | Leontodon autumnalis L. | fall dandelion | Asteraceae
|
| LEDA4 | Leontodon danubialis Jacq. | Leontodon hispidus ssp. danubialis | Asteraceae
|
| LEER2 | Leontodon erythrospermum (Andrz. ex Bess.) Britt. | Taraxacum laevigatum | Asteraceae
|
| LEHAG | Leontodon hastilis L. var. glabratus W.D.J. Koch | Leontodon hispidus ssp. danubialis | Asteraceae
|
| LEHAV | Leontodon hastilis L. var. vulgaris W.D.J. Koch | Leontodon hispidus ssp. hispidus | Asteraceae
|
| LEHA2 | Leontodon hastilis L. | Leontodon hispidus ssp. danubialis | Asteraceae
|
| LEHI4 | Leontodon hirtus L. | rough hawkbit | Asteraceae
|
| LEHID | Leontodon hispidus L. ssp. danubialis (Jacq.) Simonkai | bristly hawkbit | Asteraceae
|
| LEHIH | Leontodon hispidus L. ssp. hispidus | bristly hawkbit | Asteraceae
|
| LEHIG | Leontodon hispidus L. var. glabratus (W.D.J. Koch) Bisch. | Leontodon hispidus ssp. danubialis | Asteraceae
|
| LEHI | Leontodon hispidus L. | bristly hawkbit | Asteraceae
|
| LELA13 | Leontodon latiloba (DC.) Britt. | Taraxacum officinale ssp. vulgare | Asteraceae
|
| LELE4 | Leontodon leysseri (Wallr.) G. Beck | Leontodon taraxacoides ssp. taraxacoides | Asteraceae
|
| LENUT | Leontodon nudicaulis (L.) Banks ex Schinz & R. Keller ssp. taraxacoides (Vill.) Schinz & Thellung | Leontodon taraxacoides ssp. taraxacoides | Asteraceae
|
| LENU2 | Leontodon nudicaulis (L.) Banks ex Schinz & R. Keller | Leontodon hirtus | Asteraceae
|
| LETAL | Leontodon taraxacoides (Vill.) M�rat ssp. longirostris Finch & Sell | lesser hawkbit | Asteraceae
|
| LETAT | Leontodon taraxacoides (Vill.) M�rat ssp. taraxacoides | lesser hawkbit | Asteraceae
|
| LETA | Leontodon taraxacoides (Vill.) M�rat | lesser hawkbit | Asteraceae
|
| LETA2 | Leontodon taraxacum L. p.p. | Taraxacum officinale ssp. vulgare | Asteraceae
|
| LEONT | Leontodon L. | hawkbit | Asteraceae
|
| LEAR7 | Leonurus artemisia auct. non Lour. | Leonurus sibiricus | Lamiaceae
|
| LECA2 | Leonurus cardiaca L. | common motherwort | Lamiaceae
|
| LEMA2 | Leonurus marrubiastrum L. | Chaiturus marrubiastrum | Lamiaceae
|
| LESI | Leonurus sibiricus L. | honeyweed | Lamiaceae
|
| LEONU | Leonurus L. | motherwort | Lamiaceae
|
| LECO14 | Leopoldia comosa (L.) Parl. | Muscari comosum | Liliaceae
|
| LEPI11 | Leopoldinia piassaba Wallace | para piassava | Arecaceae
|
| LEOPO | Leopoldinia C. Martius | leopoldinia | Arecaceae
|
| LECO13 | Lepachys columnifera (Nutt.) J.F. Macbr. | Ratibida columnifera | Asteraceae
|
| LEPEP | Lepachys peduncularis Torr. & Gray var. picta Gray | Ratibida peduncularis var. picta | Asteraceae
|
| LEPE7 | Lepachys peduncularis Torr. & Gray | Ratibida peduncularis var. peduncularis | Asteraceae
|
| LEMA11 | Lepadena marginata (Pursh) Nieuwl. | Euphorbia marginata | Euphorbiaceae
|
| LECA55 | Lepanthes caritensis Tremblay & Ackerman | Carite babyboot orchid | Orchidaceae
|
| LEDO3 | Lepanthes dodiana Stimson | island babyboot orchid | Orchidaceae
|
| LEEL2 | Lepanthes eltoroensis Stimson | Luquillo Mountain babyboot orchid | Orchidaceae
|
| LEHA4 | Lepanthes harrisii Fawcett & Rendle | Lepanthopsis melanantha | Orchidaceae
|
| LERU5 | Lepanthes rubripetala Stimson | forest babyboot orchid | Orchidaceae
|
| LERU2 | Lepanthes rupestris Stimson | rock babyboot orchid | Orchidaceae
|
| LESA3 | Lepanthes sanguinea Hook. | Jamaican babyboot orchid | Orchidaceae
|
| LESE2 | Lepanthes selenitepala Reichenb. f. | mountain babyboot orchid | Orchidaceae
|
| LEVER | Lepanthes veleziana Stimson var. retusicolumna Stimson | Puerto Rico babyboot orchid | Orchidaceae
|
| LEVEV | Lepanthes veleziana Stimson var. veleziana | Puerto Rico babyboot orchid | Orchidaceae
|
| LEVE | Lepanthes veleziana Stimson | Puerto Rico babyboot orchid | Orchidaceae
|
| LEWO | Lepanthes woodburyana Stimson | Woodbury's babyboot orchid | Orchidaceae
|
| LEPAN | Lepanthes Sw. | babyboot orchid | Orchidaceae
|
| LEME | Lepanthopsis melanantha (Reichenb. f.) Ames | tiny orchid | Orchidaceae
|
| LEPAN2 | Lepanthopsis Ames | lepanthopsis | Orchidaceae
|
| LEAR10 | Lepargyrea argentea (Pursh) Greene | Shepherdia argentea | Elaeagnaceae
|
| LECA13 | Lepargyrea canadensis (L.) Greene | Shepherdia canadensis | Elaeagnaceae
|
| LECA3 | Lepechinia calycina (Benth.) Epling ex Munz | woodbalm | Lamiaceae
|
| LECA4 | Lepechinia cardiophylla Epling | Santa Ana pitchersage | Lamiaceae
|
| LEFR | Lepechinia fragrans (Greene) Epling | island pitchersage | Lamiaceae
|
| LEGA | Lepechinia ganderi Epling | San Diego pitchersage | Lamiaceae
|
| LEHA | Lepechinia hastata (Gray) Epling | pakaha | Lamiaceae
|
| LEPEC | Lepechinia Willd. | pitchersage | Lamiaceae
|
| LEPE4 | Lepianthes peltata (L.) Raf. | monkey's hand | Piperaceae
|
| LEUM | Lepianthes umbellata (L.) Raf. | Lepianthes peltata | Piperaceae
|
| LEPIA | Lepianthes Raf. | lepianthes | Piperaceae
|
| LEAL9 | Lepidagathis alopecuroidea (Vahl) R. Br. ex Griseb. | Teliostachya alopecuroidea | Acanthaceae
|
| LESU2 | Lepidanthus suaveolens (Pursh) Nutt. | Matricaria discoidea | Asteraceae
|
| LEGL23 | Lepidaploa glabra (Willd.) H. Rob. | Vernonia albicaulis | Asteraceae
|
| LESE16 | Lepidaploa sericea (L.C. Rich.) H. Rob. | Vernonia sericea | Asteraceae
|
| LEAC3 | Lepidium acutidens (Gray) T.J. Howell | Lepidium dictyotum var. acutidens | Brassicaceae
|
| LEAF | Lepidium africanum (Burm. f.) DC. | African pepperwort | Brassicaceae
|
| LEALA3 | Lepidium alyssoides Gray var. alyssoides | mesa pepperwort | Brassicaceae
|
| LEALA4 | Lepidium alyssoides Gray var. angustifolium (C.L. Hitchc.) Rollins | mesa pepperwort | Brassicaceae
|
| LEALE | Lepidium alyssoides Gray var. eastwoodiae (Woot.) Rollins | mesa pepperwort | Brassicaceae
|
| LEALJ | Lepidium alyssoides Gray var. junceum Rollins | mesa pepperwort | Brassicaceae
|
| LEAL4 | Lepidium alyssoides Gray | mesa pepperwort | Brassicaceae
|
| LEAR5 | Lepidium arbuscula Hbd. | Waianae Range pepperwort | Brassicaceae
|
| LEAU3 | Lepidium austrinum Small | southern pepperwort | Brassicaceae
|
| LEBA | Lepidium barnebyanum Reveal | Barneby's pepperweed | Brassicaceae
|
| LEBIO | Lepidium bidentatum Morton var. owaihiense (Cham. & Schlecht.) Fosberg | Kunana pepperwort | Brassicaceae
|
| LEBIR | Lepidium bidentatum Morton var. remyi (Drake) Fosberg | Remy's pepperweed | Brassicaceae
|
| LEBI | Lepidium bidentatum Morton | Kunana pepperwort | Brassicaceae
|
| LEBI3 | Lepidium bipinnatifidum auct. non Desv. | Lepidium oblongum var. oblongum | Brassicaceae
|
| LEBO2 | Lepidium bonariense L. | Argentine pepperweed | Brassicaceae
|
| LEBO | Lepidium bourgeauanum Thellung | Lepidium ramosissimum var. bourgeauanum | Brassicaceae
|
| LECAH | Lepidium campestre (L.) Ait. f. var. heterophyllum (S. Wats.) C.L. Hitchc. | Lepidium integrifolium var. heterophyllum | Brassicaceae
|
| LECAI | Lepidium campestre (L.) Ait. f. var. integrifolium (Nutt.) C.L. Hitchc. | Lepidium integrifolium var. integrifolium | Brassicaceae
|
| LECA5 | Lepidium campestre (L.) Ait. f. | field pepperweed | Brassicaceae
|
| LECR12 | Lepidium crenatum (Greene) Rydb. | alkalai pepperweed | Brassicaceae
|
| LEDA2 | Lepidium davisii Rollins | Davis' pepperweed | Brassicaceae
|
| LEDEB2 | Lepidium densiflorum Schrad. var. bourgeauanum (Thellung) C.L. Hitchc. | Lepidium ramosissimum var. bourgeauanum | Brassicaceae
|
| LEDED | Lepidium densiflorum Schrad. var. densiflorum | common pepperweed | Brassicaceae
|
| LEDEE | Lepidium densiflorum Schrad. var. elongatum (Rydb.) Thellung | tall pepperweed | Brassicaceae
|