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Plant List
Indexed Alphabetically by Common Name
L-M
For a list of plants indexed by Scientific Name, click here
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| National Common Name | Scientific Name with Author | Symbol | Family | |
| La Cruz manzanita | Arctostaphylos cruzensis J.B. Roof | ARCR6 | Ericaceae | |
| la graciosa thistle | Cirsium loncholepis Petrak | CILO | Asteraceae | |
| La Panza manzanita | Arctostaphylos pilosula Jepson & Wies. ex Jepson | ARPI | Ericaceae | |
| La Purissima manzanita | Arctostaphylos purissima P.V. Wells | ARPU10 | Ericaceae | |
| Labrador bryum moss | Bryum longisetum Bland. ex Schwaegr. var. labradorense (Philib.) C. Jens. | BRLOL2 | Bryaceae | |
| Labrador cup lichen | Cladonia labradorica Ahti & Brodo | CLLA8 | Cladoniaceae | |
| Labrador Indian paintbrush | Castilleja septentrionalis Lindl. | CASE4 | Scrophulariaceae | |
| lace lipfern | Cheilanthes gracillima D.C. Eat. | CHGR | Pteridaceae | |
| lacefern | Aspidotis (Nutt. ex Hook.) Copeland | ASPID2 | Pteridaceae | |
| lacefern | Ctenitis (C. Christens.) C. Christens. ex Tardieu-Blot & C. Christens | CTENI2 | Dryopteridaceae | |
| laceleaf | Anthurium Schott | ANTHU | Araceae | |
| Lackschewitz's milkvetch | Astragalus lackschewitzii Lavin & H. Marriott | ASLA26 | Fabaceae | |
| lacy spleenwort | Asplenium horridum Kaulfuss | ASHO4 | Aspleniaceae | |
| lacy thistle | Cirsium modestum (Osterhout) Cockerell | CIMO2 | Asteraceae | |
| ladies'-tresses | Cyclopogon K. Presl | CYCLO5 | Orchidaceae | |
| Lady Bird's centaury | Centaurium texense (Griseb.) Fern. | CETE2 | Gentianaceae | |
| lady of the night cactus | Cereus hexagonus (L.) P. Mill. | CEHE3 | Cactaceae | |
| lady of the night orchid | Brassavola nodosa (L.) Lindl. | BRNO3 | Orchidaceae | |
| ladyfern | Athyrium Roth | ATHYR | Dryopteridaceae | |
| lady's mantle | Alchemilla L. | ALCHE | Rosaceae | |
| lady's nightcap | Bonamia Thouars | BONAM | Convolvulaceae | |
| lady's slipper | Cypripedium L. | CYPRI | Orchidaceae | |
| lady's-mantle | Alchemilla mollis (Buser) Rothm. | ALMO12 | Rosaceae | |
| Lahontan milkvetch | Astragalus porrectus S. Wats. | ASPO3 | Fabaceae | |
| Lake Almanor clarkia | Clarkia stellata Mosquin | CLST3 | Onagraceae | |
| Lake Ella hawthorn | Crataegus integra Beadle | CRIN18 | Rosaceae | |
| lakeshore sedge | Carex lenticularis Michx. | CALE8 | Cyperaceae | |
| lakeshore sedge | Carex lenticularis Michx. var. impressa (Bailey) L.A. Standley | CALEI | Cyperaceae | |
| lakeshore sedge | Carex lenticularis Michx. var. lenticularis | CALEL | Cyperaceae | |
| lakeshore sedge | Carex lenticularis Michx. var. limnophila (Holm) Cronq. | CALEL2 | Cyperaceae | |
| lamb succory | Arnoseris minima (L.) Schweig. & Koerte | ARMI3 | Asteraceae | |
| lambsquarters | Chenopodium album L. | CHAL7 | Chenopodiaceae | |
| lambsquarters | Chenopodium album L. var. album | CHALA | Chenopodiaceae | |
| lambsquarters | Chenopodium album L. var. microphyllum Boenn. | CHALM | Chenopodiaceae | |
| lamilla | Bouteloua juncea (Desv. ex Beauv.) A.S. Hitchc. | BOJU | Poaceae | |
| lanate balsamroot | Balsamorhiza lanata (Sharp) W.A. Weber | BALA8 | Asteraceae | |
| lance asplenium | Asplenium ruta-muraria L. var. lanceolum Christ | ASRUL | Aspleniaceae | |
| lanceleaf anoda | Anoda lanceolata Hook. & Arn. | ANLA4 | Malvaceae | |
| lanceleaf arnica | Arnica lanceolata Nutt. | ARLA7 | Asteraceae | |
| lanceleaf browneyes | Camissonia claviformis (Torr. & Frém.) Raven ssp. lancifolia (Heller) Raven | CACLL | Onagraceae | |
| lanceleaf cyanea | Cyanea lanceolata (Gaud.) Lammers, Givnish & Sytsma | CYLA12 | Campanulaceae | |
| lanceleaf grapefern | Botrychium lanceolatum (Gmel.) Angstr. | BOLA | Ophioglossaceae | |
| lanceleaf grapefern | Botrychium lanceolatum (Gmel.) Angstr. var. angustisegmentum Pease & Moore | BOLAA2 | Ophioglossaceae | |
| lanceleaf grapefern | Botrychium lanceolatum (Gmel.) Angstr. var. lanceolatum | BOLAL | Ophioglossaceae | |
| lanceleaf ragweed | Ambrosia bidentata Michx. | AMBI2 | Asteraceae | |
| lanceleaf rattlebox | Crotalaria lanceolata E. Mey. | CRLA7 | Fabaceae | |
| lanceleaf springbeauty | Claytonia flava A. Nels. | CLFL3 | Portulacaceae | |
| lanceleaf springbeauty | Claytonia lanceolata Pall. ex Pursh | CLLA2 | Portulacaceae | |
| lanceleaf springbeauty | Claytonia lanceolata Pall. ex Pursh var. chrysantha (Greene) C.L. Hitchc. | CLLAC | Portulacaceae | |
| lanceleaf springbeauty | Claytonia lanceolata Pall. ex Pursh var. lanceolata | CLLAL | Portulacaceae | |
| lanceleaf springbeauty | Claytonia lanceolata Pall. ex Pursh var. sessilifolia (Torr.) A. Nels. | CLLAS | Portulacaceae | |
| lanceleaf springbeauty | Claytonia multiscapa Rydb. | CLMU5 | Portulacaceae | |
| lanceleaf thorow wax | Bupleurum lancifolium Hornem. | BULA3 | Apiaceae | |
| lanceleaf tickseed | Coreopsis lanceolata L. | COLA5 | Asteraceae | |
| lanceleaf water plantain | Alisma lanceolatum Withering | ALLA2 | Alismataceae | |
| Lane Mountain milkvetch | Astragalus jaegerianus Munz | ASJA | Fabaceae | |
| Langsdorf's copaifera | Copaifera langsdorfii Desf. | COLA14 | Fabaceae | |
| lapalapa | Cheirodendron platyphyllum (Hook. & Arn.) Seem. | CHPL | Araliaceae | |
| lapalapa | Cheirodendron platyphyllum (Hook. & Arn.) Seem. ssp. kauaiense (Krajina) Lowry | CHPLK | Araliaceae | |
| lapalapa | Cheirodendron platyphyllum (Hook. & Arn.) Seem. ssp. platyphyllum | CHPLP | Araliaceae | |
| Lapland amphidium moss | Amphidium lapponicum (Hedw.) Schimp. | AMLA70 | Orthotrichaceae | |
| Lapland cornel | Cornus suecica L. | COSU4 | Cornaceae | |
| lapland reedgrass | Calamagrostis lapponica (Wahlenb.) Hartman | CALA6 | Poaceae | |
| Lapland sedge | Carex lapponica O.F. Lang | CALA15 | Cyperaceae | |
| Laramie columbine | Aquilegia laramiensis A. Nels. | AQLA | Ranunculaceae | |
| larch dwarf mistletoe | Arceuthobium laricis (Piper) St. John | ARLA11 | Viscaceae | |
| Laredo sandmat | Chamaesyce laredana (Millsp.) Small | CHLA8 | Euphorbiaceae | |
| large boykinia | Boykinia major Gray | BOMA3 | Saxifragaceae | |
| large bullwort | Ammi majus L. | AMMA | Apiaceae | |
| large camas | Camassia leichtlinii (Baker) S. Wats. | CALE5 | Liliaceae | |
| large camas | Camassia leichtlinii (Baker) S. Wats. ssp. leichtlinii | CALEL6 | Liliaceae | |
| large fever berry | Croton megalobotrys Müll.Arg. | CRME15 | Euphorbiaceae | |
| large toothwort | Cardamine maxima (Nutt.) Wood | CAMA36 | Brassicaceae | |
| largebract spiderling | Boerhavia wrightii Gray | BOWR | Nyctaginaceae | |
| largeflower brunfelsia | Brunfelsia grandiflora D. Don | BRGR9 | Solanaceae | |
| largeflower cyrtandra | Cyrtandra grandiflora Gaud. | CYGR5 | Gesneriaceae | |
| largeflower false rosemary | Conradina grandiflora Small | COGR8 | Lamiaceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. | CROC | Asteraceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. ssp. conjuncta (Jepson) Babcock & Stebbins | CROCC | Asteraceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. ssp. costata (Gray) Babcock & Stebbins | CROCC2 | Asteraceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. ssp. occidentalis | CROCO2 | Asteraceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. ssp. pumila (Rydb.) Babcock & Stebbins | CROCP | Asteraceae | |
| largeflower milkweed | Asclepias connivens Baldw. | ASCO19 | Asclepiadaceae | |
| largeflower onion | Allium macropetalum Rydb. | ALMA4 | Liliaceae | |
| largeflower suncup | Camissonia megalantha (Munz) Raven | CAME16 | Onagraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet | COGR5 | Asteraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet var. grandiflora | COGRG | Asteraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet var. harveyana (Gray) Sherff | COGRH | Asteraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet var. longipes (Hook.) Torr. & Gray | COGRL | Asteraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet var. saxicola (Alexander) E.B. Sm. | COGRS | Asteraceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell | AUGR | Scrophulariaceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell var. cinerea Pennell | AUGRC | Scrophulariaceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell var. grandiflora | AUGRG | Scrophulariaceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell var. pulchra Pennell | AUGRP | Scrophulariaceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell var. serrata (Torr. ex Benth.) Pennell | AUGRS | Scrophulariaceae | |
| largeflowered fiddleneck | Amsinckia grandiflora (Kleeb. ex Gray) Kleeb. ex Greene | AMGR3 | Boraginaceae | |
| largefruit amaranth | Amaranthus deflexus L. | AMDE | Amaranthaceae | |
| largefruit beggarticks | Bidens macrocarpa (Gray) Sherff | BIMA | Asteraceae | |
| largefruit sand verbena | Abronia macrocarpa L.A. Gal. | ABMA5 | Nyctaginaceae | |
| largehead sedge | Carex macrocephala Willd. ex Spreng. | CAMA10 | Cyperaceae | |
| largehead sedge | Carex macrocephala Willd. ex Spreng. var. bracteata Holm | CAMAB2 | Cyperaceae | |
| largehead sedge | Carex macrocephala Willd. ex Spreng. var. macrocephala | CAMAM6 | Cyperaceae | |
| largeleaf brunnera | Brunnera macrophylla (J.F. Adams) I.M. Johnston | BRMA11 | Boraginaceae | |
| largeleaf cup lichen | Cladonia macrophylla (Schaerer) Stenh. | CLMA13 | Cladoniaceae | |
| largeleaf geigertree | Cordia sebestena L. | COSE2 | Boraginaceae | |
| largeleaf maidenhair | Adiantum macrophyllum Sw. | ADMA | Pteridaceae | |
| largeleaf springparsley | Cymopterus megacephalus M.E. Jones | CYME | Apiaceae | |
| largeleaf wild indigo | Baptisia alba (L.) Vent. var. macrophylla (Larisey) Isely | BAALM | Fabaceae | |
| largeseed bittercress | Cardamine macrocarpa Brandeg. | CAMA7 | Brassicaceae | |
| largeseed goosefoot | Chenopodium macrospermum Hook. f. | CHMA7 | Chenopodiaceae | |
| largeseed goosefoot | Chenopodium macrospermum Hook. f. var. farinosum (S. Wats.) J.T. Howell | CHMAF | Chenopodiaceae | |
| largespike sedge | Carex macrostachys Bertol. | CAMA51 | Cyperaceae | |
| larkdaisy | Centratherum punctatum Cass. | CEPU6 | Asteraceae | |
| larkspurleaf monkshood | Aconitum delphiniifolium DC. | ACDE2 | Ranunculaceae | |
| larkspurleaf monkshood | Aconitum delphiniifolium DC. ssp. chamissonianum (Reichenb.) Hultén | ACDEC | Ranunculaceae | |
| larkspurleaf monkshood | Aconitum delphiniifolium DC. ssp. delphiniifolium | ACDED3 | Ranunculaceae | |
| larkspurleaf monkshood | Aconitum delphiniifolium DC. ssp. paradoxum (Reichenb.) Hultén | ACDEP | Ranunculaceae | |
| larkspurleaf tickseed | Coreopsis delphiniifolia Lam. | CODE3 | Asteraceae | |
| Las Animas nakedwood | Colubrina californica I.M. Johnston | COCA18 | Rhamnaceae | |
| Las Cuevas mountainbay | Calyptranthes estremenae Alain | CAES | Myrtaceae | |
| Las Vegas cryptantha | Cryptantha insolita (J.F. Macbr.) Payson | CRIN15 | Boraginaceae | |
| lateflowering goosefoot | Chenopodium album L. var. striatum (Krasan) comb. nov. ined. | CHALS2 | Chenopodiaceae | |
| lateral sedge | Carex unilateralis Mackenzie | CAUN3 | Cyperaceae | |
| Latin American flatsedge | Cyperus lentiginosus Millsp. & Chase | CYLE | Cyperaceae | |
| Latin American spleenwort | Asplenium flabellulatum Kunze | ASFL4 | Aspleniaceae | |
| laurel avispillo | Cinnamomum elongatum (Vahl ex Nees) Kosterm. | CIEL2 | Lauraceae | |
| laurel-leaf pigeonwings | Clitoria laurifolia Poir. | CLLA4 | Fabaceae | |
| laurel-leaf snailseed | Cocculus laurifolius (Roxb.) DC. | COLA20 | Menispermaceae | |
| Laurent's milkvetch | Astragalus collinus (Hook.) Dougl. ex G. Don var. laurentii (Rydb.) Barneby | ASCOL | Fabaceae | |
| Laurent's sedge | Carex vesicaria L. var. laurentiana Fern. | CAVEL | Cyperaceae | |
| lava clermontia | Clermontia calophylla F. Wimmer | CLCA5 | Campanulaceae | |
| lava cyrtandra | Cyrtandra confertiflora (Wawra) C.B. Clarke | CYCO7 | Gesneriaceae | |
| lava cyrtandra | Cyrtandra heinrichii St. John | CYHE6 | Gesneriaceae | |
| lavafield jackbean | Canavalia pubescens Hook. & Arn. | CAPU14 | Fabaceae | |
| lavaslope centaury | Centaurium sebaeoides (Griseb.) Druce | CESE6 | Gentianaceae | |
| lavenderleaf sundrops | Calylophus lavandulifolius (Torr. & Gray) Raven | CALA38 | Onagraceae | |
| Lavin's milkvetch | Astragalus oophorus S. Wats. var. lavinii Barneby | ASOOL3 | Fabaceae | |
| lawndaisy | Bellis perennis L. | BEPE2 | Asteraceae | |
| laxflower | Baileya pauciradiata Harvey & Gray ex Gray | BAPA | Asteraceae | |
| Laxmann's milkvetch | Astragalus laxmannii Jacq. | ASLA27 | Fabaceae | |
| Le Conte's flatsedge | Cyperus lecontei Torr. ex Steud. | CYLE2 | Cyperaceae | |
| Le Conte's thistle | Cirsium lecontei Torr. & Gray | CILE2 | Asteraceae | |
| leachlobe cyphomeris | Cyphomeris crassifolia (Standl.) Standl. | CYCR2 | Nyctaginaceae | |
| leadplant | Amorpha canescens Pursh | AMCA6 | Fabaceae | |
| Leadville milkvetch | Astragalus molybdenus Barneby | ASMO8 | Fabaceae | |
| leadwood | Combretum imberbe Wawra | COIM2 | Combretaceae | |
| leaf between flower | Bothriospermum tenellum (Hornem.) Fisch. & C.A. Mey. | BOTE4 | Boraginaceae | |
| leafcover saltweed | Atriplex phyllostegia (Torr. ex S. Wats.) S. Wats. | ATPH | Chenopodiaceae | |
| leafless bentspur orchid | Campylocentrum pachyrrhizum (Reichenb. f.) Rolfe | CAPA32 | Orchidaceae | |
| leafless swallow-wort | Cynanchum scoparium Nutt. | CYSC5 | Asclepiadaceae | |
| leafstem tickseed | Coreopsis calliopsidea (DC.) Gray | COCA9 | Asteraceae | |
| leafy brickellbush | Brickellia dentata (DC.) Schultz-Bip. | BRDE2 | Asteraceae | |
| leafy goosefoot | Chenopodium foliosum (Moench) Aschers. | CHFO2 | Chenopodiaceae | |
| leafy raillardiopsis | Anisocarpus scabridus (Eastw.) B.G. Baldwin | ANSC14 | Asteraceae | |
| leafy reedgrass | Calamagrostis foliosa Kearney | CAFO | Poaceae | |
| lean flatsedge | Cyperus setigerus Torr. & Hook. | CYSE3 | Cyperaceae | |
| leastdaisy | Chaetopappa DC. | CHAET2 | Asteraceae | |
| leather flower | Clematis L. | CLEMA | Ranunculaceae | |
| leatherfern | Acrostichum L. | ACROS | Pteridaceae | |
| leatherleaf | Chamaedaphne calyculata (L.) Moench | CHCA2 | Ericaceae | |
| leatherleaf | Chamaedaphne Moench | CHAMA5 | Ericaceae | |
| leatherleaf cyanea | Cyanea coriacea (Gray) Hbd. | CYCO13 | Campanulaceae | |
| leatherweed | Croton pottsii (Klotzsch) Muell.-Arg. | CRPO5 | Euphorbiaceae | |
| leatherweed | Croton pottsii (Klotzsch) Muell.-Arg. var. pottsii | CRPOP | Euphorbiaceae | |
| leatherweed | Croton pottsii (Klotzsch) Muell.-Arg. var. thermophilus (M.C. Johnston) M.C. Johnston | CRPOT | Euphorbiaceae | |
| leathery grapefern | Botrychium multifidum (Gmel.) Trev. | BOMU | Ophioglossaceae | |
| leathery grapefern | Botrychium robustum Rupr. | BORO6 | Ophioglossaceae | |
| Leavenworth's sedge | Carex leavenworthii Dewey | CALE6 | Cyperaceae | |
| Leavenworth's tickseed | Coreopsis leavenworthii Torr. & Gray | COLE3 | Asteraceae | |
| lecanora disc lichen | Buellia lecanoroides H. Magn. | BULE | Physciaceae | |
| lechecillo | Croton discolor Willd. | CRDI8 | Euphorbiaceae | |
| lechuguilla | Agave lechuguilla Torr. | AGLE | Agavaceae | |
| leechleaf cyanea | Cyanea undulata Forbes | CYUN5 | Campanulaceae | |
| Lehmann's rockjasmine | Androsace chamaejasme Wulfen ssp. lehmanniana (Spreng.) Hultén | ANCHL | Primulaceae | |
| Leiberg's bittercress | Cardamine breweri S. Wats. var. leibergii (Holz.) C.L. Hitchc. | CABRL | Brassicaceae | |
| Leiberg's brachythecium moss | Brachythecium leibergii Grout | BRLE9 | Brachytheciaceae | |
| Leiberg's milkvetch | Astragalus leibergii M.E. Jones | ASLE5 | Fabaceae | |
| Leichardt-bean | Cassia brewsteri (F. Muell.) F. Muell. ex Benth. | CABR41 | Fabaceae | |
| Lemhi milkvetch | Astragalus aquilonius (Barneby) Barneby | ASAQ2 | Fabaceae | |
| Lemington hawthorn | Crataegus lemingtonensis Sarg. | CRLE8 | Rosaceae | |
| Lemmon's beggarticks | Bidens lemmonii Gray | BILE2 | Asteraceae | |
| Lemmon's brickellbush | Brickellia lemmonii Gray | BRLE | Asteraceae | |
| Lemmon's brickellbush | Brickellia lemmonii Gray var. lemmonii | BRLEL | Asteraceae | |
| Lemmon's brickellbush | Brickellia lemmonii Gray var. wootonii (Greene) B.L. Robins. | BRLEW | Asteraceae | |
| Lemmon's ceanothus | Ceanothus lemmonii Parry | CELE | Rhamnaceae | |
| Lemmon's cologania | Cologania obovata Schlecht. | COOB14 | Fabaceae | |
| Lemmon's Indian paintbrush | Castilleja lemmonii Gray | CALE18 | Scrophulariaceae | |
| Lemmon's milkvetch | Astragalus lemmonii Gray | ASLE6 | Fabaceae | |
| Lemmon's milkweed | Asclepias lemmonii Gray | ASLE13 | Asclepiadaceae | |
| Lemmon's needlegrass | Achnatherum lemmonii (Vasey) Barkworth | ACLE8 | Poaceae | |
| Lemmon's needlegrass | Achnatherum lemmonii (Vasey) Barkworth var. lemmonii | ACLEL | Poaceae | |
| Lemmon's onion | Allium lemmonii S. Wats. | ALLE3 | Liliaceae | |
| Lemmon's rockcress | Arabis lemmonii S. Wats. | ARLE | Brassicaceae | |
| Lemmon's rockcress | Arabis lemmonii S. Wats. var. lemmonii | ARLEL | Brassicaceae | |
| Lemmon's sedge | Carex lemmonii W. Boott | CALE7 | Cyperaceae | |
| Lemmon's snakeroot | Ageratina lemmonii (B.L. Robins.) King & H.E. Robins. | AGLE3 | Asteraceae | |
| Lemmon's wildginger | Asarum lemmonii S. Wats. | ASLE | Aristolochiaceae | |
| lemon | Citrus ×limon (L.) Burm. f. (pro sp.) [medica × aurantifolia] | CILI5 | Rutaceae | |
| lemon beebrush | Aloysia triphylla (L'Hér.) Britt. | ALTR6 | Verbenaceae | |
| lemon bottlebrush | Callistemon pallidus (Bonpl.) DC. | CAPA72 | Myrtaceae | |
| lemon grass | Cymbopogon citratus (DC. ex Nees) Stapf | CYCI | Poaceae | |
| lemon grass | Cymbopogon Spreng. | CYMBO | Poaceae | |
| lemon lichen | Candelaria A. Massal. | CANDE2 | Candelariaceae | |
| lemon lichen | Candelaria fibrosa (Fr.) Mull. Arg. | CAFI11 | Candelariaceae | |
| lemonscented gum | Corymbia citriodora (Hook.) K.D. Hill & L.A. Johnson | COCI4 | Myrtaceae | |
| lengua de vaca | Anthurium dominicense Schott | ANDO | Araceae | |
| lens pod milkvetch | Astragalus lentiformis Gray ex Brewer & S. Wats. | ASLE7 | Fabaceae | |
| lenspod whitetop | Cardaria chalepensis (L.) Hand.-Maz. | CACH42 | Brassicaceae | |
| leoncita false foxglove | Agalinis calycina Pennell | AGCA7 | Scrophulariaceae | |
| Lescur's bartramiopsis moss | Bartramiopsis lescurii (James) Kindb. | BALE6 | Polytrichaceae | |
| Lesley's rimmed lichen | Aspicilia lesleyana Darbish. | ASLE24 | Hymeneliaceae | |
| lesser blackscale sedge | Carex atrosquama Mackenzie | CAAT8 | Cyperaceae | |
| lesser bottlebrush | Callistemon phoeniceus Lindley | CAPH10 | Myrtaceae | |
| lesser brown sedge | Carex adusta Boott | CAAD2 | Cyperaceae | |
| lesser burdock | Arctium minus Bernh. | ARMI2 | Asteraceae | |
| lesser calamint | Calamintha nepeta (L.) Savi | CANE17 | Lamiaceae | |
| lesser calamint | Calamintha nepeta (L.) Savi ssp. ?nepeta | CANEN | Lamiaceae | |
| lesser calamint | Calamintha nepeta (L.) Savi ssp. glandulosa (Riquien) P.W. Ball | CANEG | Lamiaceae | |
| lesser galangal | Alpinia officinarum Hance | ALOF4 | Zingiberaceae | |
| lesser Indian paintbrush | Castilleja minor (Gray) Gray | CAMI13 | Scrophulariaceae | |
| lesser Indian paintbrush | Castilleja minor (Gray) Gray ssp. minor | CAMIM6 | Scrophulariaceae | |
| lesser Indian paintbrush | Castilleja minor (Gray) Gray ssp. spiralis (Jepson) Chuang & Heckard | CAMIS3 | Scrophulariaceae | |
| lesser knapweed | Centaurea nigra L. | CENI2 | Asteraceae | |
| lesser panicled sedge | Carex diandra Schrank | CADI4 | Cyperaceae | |
| lesser pond sedge | Carex acutiformis Ehrh. | CAAC2 | Cyperaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene | ASCO12 | Fabaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene var. convallarius | ASCOC9 | Fabaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene var. finitimus Barneby | ASCOF | Fabaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene var. margaretiae Barneby | ASCOM4 | Fabaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene var. scopulorum Barneby | ASCOS | Fabaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. | CAGL4 | Cyperaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. ssp. glareosa | CAGLG | Cyperaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. ssp. glareosa var. amphigena Fern. | CAGLA | Cyperaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. ssp. glareosa var. glareosa | CAGLG3 | Cyperaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. ssp. pribylovensis (Macoun) Halliday & Chater | CAGLP | Cyperaceae | |
| lesser saltscale | Atriplex minuscula Standl. | ATMI3 | Chenopodiaceae | |
| lesser snakeroot | Ageratina aromatica (L.) Spach | AGAR4 | Asteraceae | |
| lesser snakeroot | Ageratina aromatica (L.) Spach var. aromatica | AGARA | Asteraceae | |
| lesser snakeroot | Ageratina aromatica (L.) Spach var. incisa (Gray) C.F. Reed | AGARI2 | Asteraceae | |
| lesser swinecress | Coronopus didymus (L.) Sm. | CODI6 | Brassicaceae | |
| lesser waterplantain | Baldellia ranunculoides (L.) Parl. | BARA | Alismataceae | |
| lesser yellow lady's slipper | Cypripedium parviflorum Salisb. | CYPA19 | Orchidaceae | |
| lesser yellow lady's slipper | Cypripedium parviflorum Salisb. var. parviflorum | CYPAP4 | Orchidaceae | |
| Letterman's needlegrass | Achnatherum lettermanii (Vasey) Barkworth | ACLE9 | Poaceae | |
| Lewis' clarkia | Clarkia lewisii Raven & Parnell | CLLE2 | Onagraceae | |
| Lewis' evening-primrose | Camissonia lewisii Raven | CALE26 | Onagraceae | |
| Lewis River suncup | Camissonia parvula (Nutt. ex Torr. & Gray) Raven | CAPA39 | Onagraceae | |
| liana de cuello | Amphilophium paniculatum (L.) Kunth | AMPA6 | Bignoniaceae | |
| Liberian coffee | Coffea liberica Bull ex Hiern. | COLI8 | Rubiaceae | |
| licorice milkvetch | Astragalus glycyphyllos L. | ASGL4 | Fabaceae | |
| Liddon sedge | Carex petasata Dewey | CAPE7 | Cyperaceae | |
| light poppymallow | Callirhoe alcaeoides (Michx.) Gray | CAAL | Malvaceae | |
| lignumvitae | Bulnesia C. Gay | BULNE | Zygophyllaceae | |
| Ligurian yarrow | Achillea ligustica All. | ACLI2 | Asteraceae | |
| lija | Cordia lima (Desv.) Roemer & J.A. Schultes | COLI7 | Boraginaceae | |
| lilac snapdragon | Antirrhinum bellidifolium (L.) Willd. | ANBE5 | Scrophulariaceae | |
| lilacbush | Aubrieta Adans. | AUBRI2 | Brassicaceae | |
| lilacbush | Aubrieta deltoidea (L.) DC. | AUDE | Brassicaceae | |
| lilies-of-the-field | Anemone coronaria L. | ANCO40 | Ranunculaceae | |
| liliwai | Acaena exigua Gray | ACEX | Rosaceae | |
| lillydale onion | Allium oxyphilum Wherry | ALOX | Liliaceae | |
| lily of the Incas | Alstroemeria ?psittacina Lehm. | ALPS | Liliaceae | |
| lily of the Incas | Alstroemeria L. | ALSTR | Liliaceae | |
| lily of the Nile | Agapanthus africanus (L.) Hoffsgg. | AGAF | Liliaceae | |
| lilypad begonia | Begonia nelumbiifolia Cham. & Schlecht. | BENE3 | Begoniaceae | |
| lilythorn | Catesbaea L. | CATES | Rubiaceae | |
| Limahuli Valley cyanea | Cyanea kuhihewa Lammers | CYKU3 | Campanulaceae | |
| limber pine dwarf mistletoe | Arceuthobium cyanocarpum (A. Nels. ex Rydb.) A. Nels. | ARCY2 | Viscaceae | |
| lime fern | Cyclopeltis semicordata (Sw.) J. Sm. | CYSE4 | Dryopteridaceae | |
| lime orchid | Corymborkis forcipigera (Reichenb. f. & Warszewicz) L.O. Williams | COFO7 | Orchidaceae | |
| limestone bittercress | Cardamine douglassii Britt. | CADO | Brassicaceae | |
| limestone calamint | Clinopodium arkansanum (Nutt.) House | CLAR5 | Lamiaceae | |
| limestone flatsedge | Cyperus fuligineus Chapman | CYFU2 | Cyperaceae | |
| limestone glade milkvetch | Astragalus bibullatus Barneby & Bridges | ASBI6 | Fabaceae | |
| limestone hawksbeard | Crepis intermedia Gray | CRIN4 | Asteraceae | |
| limestone meadow sedge | Carex granularis Muhl. ex Willd. | CAGR3 | Cyperaceae | |
| limestone milkvetch | Astragalus titanophilus Barneby | ASTI2 | Fabaceae | |
| limestone sandmat | Chamaesyce blodgettii (Engelm. ex A.S. Hitchc.) Small | CHBL2 | Euphorbiaceae | |
| limestone spleenwort | Asplenium verecundum Chapman ex Underwood | ASVE6 | Aspleniaceae | |
| limestone thoroughwort | Chromolaena borinquensis (Britt.) King & H.E. Robins. | CHBO3 | Asteraceae | |
| limoncillo | Calyptranthes krugii Kiaersk. | CAKR | Myrtaceae | |
| limoncillo de monte | Calyptranthes sintenisii Kiaersk. | CASI8 | Myrtaceae | |
| Lindheimer's croton | Croton glandulosus L. var. lindheimeri Muell.-Arg. | CRGLL | Euphorbiaceae | |
| Lindheimer's hackberry | Celtis lindheimeri Engelm. ex K. Koch | CELI | Ulmaceae | |
| Lindheimer's hogwort | Croton capitatus Michx. var. lindheimeri (Engelm. & Gray) Muell.-Arg. | CRCAL2 | Euphorbiaceae | |
| Lindheimer's Indian paintbrush | Castilleja purpurea (Nutt.) G. Don var. lindheimeri (Gray) Shinners | CAPUL | Scrophulariaceae | |
| Lindheimer's milkvetch | Astragalus lindheimeri Engelm. ex Gray | ASLI4 | Fabaceae | |
| Lindley's butterflybush | Buddleja lindleyana Fortune | BULI | Buddlejaceae | |
| Lindley's clarkia | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. ssp. lindleyi (Dougl.) H.F. & M.E. Lewis | CLAML | Onagraceae | |
| Lindley's clerodendrum | Clerodendrum lindleyi Dcne. | CLLI6 | Verbenaceae | |
| Lindley's clerodendrum | Clerodendrum lindleyi Dcne. var. paniculatum Moldenke | CLLIP | Verbenaceae | |
| Lindley's saltbush | Atriplex lindleyi Moq. | ATLI | Chenopodiaceae | |
| Lindsey's cyanea | Cyanea ?lindseyana Rock | CYLI6 | Campanulaceae | |
| linearleaf cyanea | Cyanea linearifolia Rock | CYLI7 | Campanulaceae | |
| lined sedge | Carex striatula Michx. | CAST17 | Cyperaceae | |
| lineleaf fern | Antrophyum Kaulfuss | ANTRO | Vittariaceae | |
| lineseed | Bellardia All. | BELLA | Scrophulariaceae | |
| linguam | Capparis indica (L.) Druce | CAIN5 | Capparaceae | |
| Link's coenogonium lichen | Coenogonium linkii Ehrenb. | COLI13 | Gyalectaceae | |
| lion's tail | Chaiturus marrubiastrum (L.) Reichenb. | CHMA18 | Lamiaceae | |
| lion's tail | Chaiturus Willd. | CHAIT | Lamiaceae | |
| lipfern | Cheilanthes Sw. | CHEIL | Pteridaceae | |
| lipsticktree | Bixa orellana L. | BIOR | Bixaceae | |
| little amphianthus | Amphianthus pusillus Torr. | AMPU7 | Scrophulariaceae | |
| Little Belt Mountain thimbleweed | Anemone lithophila Rydb. | ANLI4 | Ranunculaceae | |
| little bun milkvetch | Astragalus simplicifolius (Nutt.) Gray | ASSI4 | Fabaceae | |
| little cryptantha | Cryptantha minima Rydb. | CRMI5 | Boraginaceae | |
| little goblin moonwort | Botrychium mormo W.H. Wagner | BOMO2 | Ophioglossaceae | |
| little grapefern | Botrychium simplex E. Hitchc. | BOSI | Ophioglossaceae | |
| little green sedge | Carex viridula Michx. | CAVI5 | Cyperaceae | |
| little green sedge | Carex viridula Michx. ssp. brachyrrhyncha (Celak.) B. Schmid | CAVIB | Cyperaceae | |
| little green sedge | Carex viridula Michx. ssp. brachyrrhyncha (Celak.) B. Schmid var. elatior (Schlecht.) Crins | CAVIE | Cyperaceae | |
| little green sedge | Carex viridula Michx. ssp. oedocarpa (Anderss.) B. Schmid | CAVIO | Cyperaceae | |
| little green sedge | Carex viridula Michx. ssp. viridula | CAVIV | Cyperaceae | |
| little ironweed | Cyanthillium cinereum (L.) H.E. Robins. | CYCI4 | Asteraceae | |