| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| LEVI11 | Leucophyllum violaceum Pennell | Leucophyllum candidum | Scrophulariaceae
|
| LEZY | Leucophyllum zygophyllum I.M. Johnst. | cimmeron | Scrophulariaceae
|
| LEUCO3 | Leucophyllum Bonpl. | barometerbush | Scrophulariaceae
|
| LEGR7 | Leucophysalis grandiflora (Hook.) Rydb. | large false groundcherry | Solanaceae
|
| LENA3 | Leucophysalis nana (Gray) Averett | dwarf chamaesaracha | Solanaceae
|
| LEUCO7 | Leucophysalis Rydb. | leucophysalis | Solanaceae
|
| LEKI2 | Leucopoa kingii (S. Wats.) W.A. Weber | spike fescue | Poaceae
|
| LEUCO12 | Leucopoa Griseb. | spike fescue | Poaceae
|
| LEHU4 | Leucopsidium humile Benth. | Aphanostephus ramosissimus var. humilis | Asteraceae
|
| LEPA14 | Leucopterum parvifolium (DC.) Small | Rhynchosia parvifolia | Fabaceae
|
| LECO46 | Leucospermum cordifolium (Salisb. ex Knight) Fourc. | red pincushion-protea | Proteaceae
|
| LEUCO13 | Leucospermum R. Br. | leucospermum | Proteaceae
|
| LEMU | Leucospora multifida (Michx.) Nutt. | narrowleaf paleseed | Scrophulariaceae
|
| LEUCO4 | Leucospora Nutt. | leucospora | Scrophulariaceae
|
| LECAI2 | Leucosyris carnosa (Gray) Greene var. intricata (Gray) Cronq. | Machaeranthera carnosa var. intricata | Asteraceae
|
| LECA59 | Leucosyris carnosa (Gray) Greene | Machaeranthera carnosa var. carnosa | Asteraceae
|
| LESP3 | Leucosyris spinosa (Benth.) Greene | Chloracantha spinosa | Asteraceae
|
| LEAC4 | Leucothoe acuminata (Ait.) G. Don | Agarista populifolia | Ericaceae
|
| LEAXA | Leucothoe axillaris (Lam.) D. Don var. ambigens Fern. | Leucothoe axillaris | Ericaceae
|
| LEAXE | Leucothoe axillaris (Lam.) D. Don var. editorum (Fern. & Schub.) Ahles | Leucothoe fontanesiana | Ericaceae
|
| LEAX | Leucothoe axillaris (Lam.) D. Don | coastal doghobble | Ericaceae
|
| LECA14 | Leucothoe catesbaei (Walt.) Gray | Leucothoe axillaris | Ericaceae
|
| LEDA | Leucothoe davisiae Torr. ex Gray | Sierra laurel | Ericaceae
|
| LEED2 | Leucothoe editorum Fern. & Schub. | Leucothoe fontanesiana | Ericaceae
|
| LEEL3 | Leucothoe elongata Small | Leucothoe racemosa | Ericaceae
|
| LEFO | Leucothoe fontanesiana (Steud.) Sleumer | highland doghobble | Ericaceae
|
| LEPL | Leucothoe platyphylla Small | Leucothoe axillaris | Ericaceae
|
| LEPO4 | Leucothoe populifolia (Lam.) Dippel | Agarista populifolia | Ericaceae
|
| LERAP | Leucothoe racemosa (L.) Gray var. projecta Fern. | Leucothoe racemosa | Ericaceae
|
| LERA4 | Leucothoe racemosa (L.) Gray | swamp doghobble | Ericaceae
|
| LERE6 | Leucothoe recurva (Buckl.) Gray | redtwig doghobble | Ericaceae
|
| LEWA3 | Leucothoe walteri Melvin | Agarista populifolia | Ericaceae
|
| LEUCO5 | Leucothoe D. Don | doghobble | Ericaceae
|
| LEOF | Levisticum officinale W.D.J. Koch | garden lovage | Apiaceae
|
| LEPA13 | Levisticum paludapifolium Aschers. | Levisticum officinale | Apiaceae
|
| LEVIS | Levisticum Hill | levisticum | Apiaceae
|
| LEBR | Lewisia brachycalyx Engelm. ex Gray | shortsepal lewisia | Portulacaceae
|
| LECA11 | Lewisia cantelovii J.T. Howell | Cantelow's lewisia | Portulacaceae
|
| LECOC3 | Lewisia columbiana (T.J. Howell ex Gray) B.L. Robins. ssp. congdonii (Rydb.) Ferris | Lewisia congdonii | Portulacaceae
|
| LECOR | Lewisia columbiana (T.J. Howell ex Gray) B.L. Robins. ssp. rupicola (English) Ferris | Lewisia columbiana var. rupicola | Portulacaceae
|
| LECOW2 | Lewisia columbiana (T.J. Howell ex Gray) B.L. Robins. ssp. wallowensis (C.L. Hitchc.) J.E. Hohn ex B. Mathew | Lewisia columbiana var. wallowensis | Portulacaceae
|
| LECOC | Lewisia columbiana (T.J. Howell ex Gray) B.L. Robins. var. columbiana | Columbian lewisia | Portulacaceae
|
| LECOR2 | Lewisia columbiana (T.J. Howell ex Gray) B.L. Robins. var. rupicola (English) C.L. Hitchc. | Columbian lewisia | Portulacaceae
|
| LECOW | Lewisia columbiana (T.J. Howell ex Gray) B.L. Robins. var. wallowensis C.L. Hitchc. | Wallowa lewisia | Portulacaceae
|
| LECO3 | Lewisia columbiana (T.J. Howell ex Gray) B.L. Robins. | Columbian lewisia | Portulacaceae
|
| LECO4 | Lewisia congdonii (Rydb.) S. Clay | Congdon's lewisia | Portulacaceae
|
| LECOC2 | Lewisia cotyledon (S. Wats.) B.L. Robins. var. cotyledon | Siskiyou lewisia | Portulacaceae
|
| LECOH | Lewisia cotyledon (S. Wats.) B.L. Robins. var. heckneri (Morton) Munz | Heckner's lewisia | Portulacaceae
|
| LECOH2 | Lewisia cotyledon (S. Wats.) B.L. Robins. var. howellii (S. Wats.) Jepson | Howell's lewisia | Portulacaceae
|
| LECOP | Lewisia cotyledon (S. Wats.) B.L. Robins. var. purdyi Jepson | Lewisia cotyledon var. cotyledon | Portulacaceae
|
| LECO5 | Lewisia cotyledon (S. Wats.) B.L. Robins. | Siskiyou lewisia | Portulacaceae
|
| LEDI3 | Lewisia disepala Rydb. | Yosemite lewisia | Portulacaceae
|
| LEGL4 | Lewisia glandulosa (Rydb.) Dempster | Sierra lewisia | Portulacaceae
|
| LEHO11 | Lewisia howellii (S. Watson) B.L. Rob. | Lewisia cotyledon var. howellii | Portulacaceae
|
| LEKEH | Lewisia kelloggii K. Brandeg. ssp. hutchisonii Dempster | Kellogg's lewisia | Portulacaceae
|
| LEKEK | Lewisia kelloggii K. Brandeg. ssp. kelloggii | Kellogg's lewisia | Portulacaceae
|
| LEKE | Lewisia kelloggii K. Brandeg. | Kellogg's lewisia | Portulacaceae
|
| LELE8 | Lewisia leeana (Porter) B.L. Robins. | quill-leaf lewisia | Portulacaceae
|
| LELO2 | Lewisia longipetala (Piper) S. Clay | Truckee lewisia | Portulacaceae
|
| LEMA3 | Lewisia maguirei A. Holmgren | Maguire's lewisia | Portulacaceae
|
| LEMI11 | Lewisia minima (A. Nels.) A. Nels. | Lewisia pygmaea | Portulacaceae
|
| LEMI12 | Lewisia minor Rydb. | Lewisia rediviva var. minor | Portulacaceae
|
| LENE5 | Lewisia nevadensis (Gray) B.L. Robins. | Nevada lewisia | Portulacaceae
|
| LEOP | Lewisia oppositifolia (S. Wats.) B.L. Robins. | oppositeleaf lewisia | Portulacaceae
|
| LEPYG | Lewisia pygmaea (Gray) B.L. Robins. ssp. glandulosa (Rydb.) Ferris | Lewisia glandulosa | Portulacaceae
|
| LEPYL | Lewisia pygmaea (Gray) B.L. Robins. ssp. longipetala (Piper) Ferris | Lewisia longipetala | Portulacaceae
|
| LEPYA | Lewisia pygmaea (Gray) B.L. Robins. var. aridorum Bartlett | Lewisia pygmaea | Portulacaceae
|
| LEPYN | Lewisia pygmaea (Gray) B.L. Robins. var. nevadensis (Gray) Fosberg | Lewisia nevadensis | Portulacaceae
|
| LEPY2 | Lewisia pygmaea (Gray) B.L. Robins. | alpine lewisia | Portulacaceae
|
| LEREM2 | Lewisia rediviva Pursh ssp. minor (Rydb.) A. Holmgren | Lewisia rediviva var. minor | Portulacaceae
|
| LEREM | Lewisia rediviva Pursh var. minor (Rydb.) Munz | bitter root | Portulacaceae
|
| LERER | Lewisia rediviva Pursh var. rediviva | bitter root | Portulacaceae
|
| LERE7 | Lewisia rediviva Pursh | bitter root | Portulacaceae
|
| LERU3 | Lewisia rupicola English | Lewisia columbiana var. rupicola | Portulacaceae
|
| LESE3 | Lewisia serrata Heckard & Stebbins | sawtooth lewisia | Portulacaceae
|
| LESI3 | Lewisia sierrae Ferris | Lewisia pygmaea | Portulacaceae
|
| LEST6 | Lewisia stebbinsii Gankin & Hildreth | Stebbins' lewisia | Portulacaceae
|
| LETR2 | Lewisia triphylla (S. Wats.) B.L. Robins. | threeleaf lewisia | Portulacaceae
|
| LETW | Lewisia tweedyi (Gray) B.L. Robins. | Cistanthe tweedyi | Portulacaceae
|
| LEWH | Lewisia �whiteae Purdy | | Portulacaceae
|
| LEYO | Lewisia yosemitana (K. Brandeg.) Jepson | Lewisia kelloggii ssp. kelloggii | Portulacaceae
|
| LEWIS | Lewisia Pursh | lewisia | Portulacaceae
|
| LEFO2 | Leycesteria formosa Wallich | Himalayan honeysuckle | Caprifoliaceae
|
| LEYCE | Leycesteria Wallich | leycesteria | Caprifoliaceae
|
| LEKO | �Leymostachys korovinii Tzvelev | Psathyrostachys juncea | Poaceae
|
| LEAM | Leymus ambiguus (Vasey & Scribn.) D.R. Dewey | Colorado wildrye | Poaceae
|
| LEAN3 | Leymus angustus (Trin.) Pilger | Altai wildrye | Poaceae
|
| LEARM | Leymus arenarius (L.) Hochst. ssp. mollis (Trin.) Tzvelev | Leymus mollis ssp. mollis | Poaceae
|
| LEAR11 | Leymus arenarius (L.) Hochst. | sand ryegrass | Poaceae
|
| LEAR9 | Leymus arenicola (Scribn. & J.G. Sm.) Pilger | Leymus flavescens | Poaceae
|
| LECI4 | Leymus cinereus (Scribn. & Merr.) A. L�ve | basin wildrye | Poaceae
|
| LECO12 | Leymus condensatus (J. Presl) A. L�ve | giant wildrye | Poaceae
|
| LEFL4 | Leymus flavescens (Scribn. & J.G. Sm.) Pilger | yellow wildrye | Poaceae
|
| LEGI3 | Leymus giganteus (Vahl) Pilger | Leymus racemosus | Poaceae
|
| LEINA | Leymus innovatus (Beal) Pilger ssp. ambiguus (Vasey & Scribn.) A. L�ve | Leymus ambiguus | Poaceae
|
| LEIN6 | Leymus innovatus (Beal) Pilger | downy ryegrass | Poaceae
|
| LEMOM2 | Leymus mollis (Trin.) Pilger ssp. mollis | American dunegrass | Poaceae
|
| LEMOV | Leymus mollis (Trin.) Pilger ssp. villosissimus (Scribn.) A. L�ve | American dunegrass | Poaceae
|
| LEMO8 | Leymus mollis (Trin.) Pilger | American dunegrass | Poaceae
|
| LEMU11 | Leymus multicaulis (Kar. & Kir.) Tzvelev | manystem wildrye | Poaceae
|
| LEMU4 | Leymus �multiflorus (Gould) Barkworth & Atkins | | Poaceae
|