| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| LISQ2 | Liatris squarrulosa Michx. | Appalachian blazing star | Asteraceae
|
| LIST6 | Liatris �steelei Gaiser | | Asteraceae
|
| LITEL | Liatris tenuifolia Nutt. var. laevigata (Nutt.) B.L. Robins. | Liatris tenuifolia var. quadriflora | Asteraceae
|
| LITEQ | Liatris tenuifolia Nutt. var. quadriflora Chapman | shortleaf blazing star | Asteraceae
|
| LITET2 | Liatris tenuifolia Nutt. var. tenuifolia | shortleaf blazing star | Asteraceae
|
| LITE6 | Liatris tenuifolia Nutt. | shortleaf blazing star | Asteraceae
|
| LITE | Liatris tenuis Shinners | Gulf blazing star | Asteraceae
|
| LITU3 | Liatris turgida Gaiser | turgid blazing star | Asteraceae
|
| LIVI8 | Liatris virgata Nutt. | grassleaf gayfeather | Asteraceae
|
| LIWE2 | Liatris �weaveri Shinners | | Asteraceae
|
| LIATR | Liatris Gaertn. ex Schreb. | blazing star | Asteraceae
|
| LIFO | Libertia formosa Graham | snowy mermaid | Iridaceae
|
| LIBER | Libertia Spreng. | libertia | Iridaceae
|
| LICO11 | Libidibia coriaria (Jacq.) Schlecht. | Caesalpinia coriaria | Fabaceae
|
| LIDE | Libocedrus decurrens Torr. | Calocedrus decurrens | Cupressaceae
|
| LIAR9 | Licania arborea Seem. | licania | Chrysobalanaceae
|
| LIMI5 | Licania michauxii Prance | gopher apple | Chrysobalanaceae
|
| LIPL | Licania platypus (Hemsley) Fritsch | licania | Chrysobalanaceae
|
| LIRI4 | Licania rigida Benth. | oiticica | Chrysobalanaceae
|
| LICAN | Licania Aubl. | licania | Chrysobalanaceae
|
| LIBR5 | Licaria brittoniana Allen & Gregory | Maria laurel | Lauraceae
|
| LIPA9 | Licaria parvifolia (Lam.) Kosterm. | Puerto Rico cinnamon | Lauraceae
|
| LISA | Licaria salicifolia (Sw.) Kosterm. | Licaria parvifolia | Lauraceae
|
| LITR | Licaria triandra (Sw.) Kosterm. | pepperleaf sweetwood | Lauraceae
|
| LICAR | Licaria Aubl. | licaria | Lauraceae
|
| LITH2 | Lichenochora thallina (Cooke) Hafellner | | Phyllachoraceae
|
| LIWE3 | Lichenochora weillii (Werner) Hafellner & R. Sant. | | Phyllachoraceae
|
| LIXA | Lichenochora xanthoriae Triebel & Rambold | | Phyllachoraceae
|
| LICHE | Lichenochora Hafellner | lichenochora | Phyllachoraceae
|
| LIER2 | Lichenoconium erodens M. S. Christ. & D. Hawksw. | | Uncertain Lichen Family
|
| LIFO5 | Lichenoconium follmannii Kondratyuk & Galloway | | Uncertain Lichen Family
|
| LILA15 | Lichenoconium laevisporum Kalb & Hafellner | | Uncertain Lichen Family
|
| LILE7 | Lichenoconium lecanorae (Jaap) D. Hawksw. | | Uncertain Lichen Family
|
| LIPY4 | Lichenoconium pyxidatae (Oudem.) Petrak & H. Sydow | | Uncertain Lichen Family
|
| LIUS2 | Lichenoconium usneae (Anzi) D. Hawksw. | | Uncertain Lichen Family
|
| LIXA2 | Lichenoconium xanthoriae M. S. Christ. | | Uncertain Lichen Family
|
| LICHE2 | Lichenoconium Petrak & H. Sydow | lichenoconium | Uncertain Lichen Family
|
| LILE9 | Lichenodiplis lecanorae (Vouaux) Dyko & D. Hawksw. | | Uncertain Lichen Family
|
| LICHE6 | Lichenodiplis Dyko & D. Hawksw. | lichenodiplis | Uncertain Lichen Family
|
| LIAL5 | Lichenosticta alcicornaria (Lindsay) D. Hawksw. | | Uncertain Lichen Family
|
| LICHE3 | Lichenosticta Zopf | lichenosticta | Uncertain Lichen Family
|
| LIEL6 | Lichenostigma elongata Nav.-Ros. & Hafellner | | Lichenotheliaceae
|
| LIMA15 | Lichenostigma maureri Hafellner | | Lichenotheliaceae
|
| LIRU5 | Lichenostigma rugosa Thor | | Lichenotheliaceae
|
| LICHE4 | Lichenostigma Hafellner | lichenostigma | Lichenotheliaceae
|
| LICA32 | Lichenothelia calcarea Henssen | | Lichenotheliaceae
|
| LICO14 | Lichenothelia convexa Hennsen | | Lichenotheliaceae
|
| LIIN8 | Lichenothelia intermixta Henssen | | Lichenotheliaceae
|
| LIME8 | Lichenothelia metzleri (J. Lahm) D. Hawksw. | | Lichenotheliaceae
|
| LISC9 | Lichenothelia scopularia (Nyl.) D. Hawksw. | | Lichenotheliaceae
|
| LITE11 | Lichenothelia tenuissima Henssen | | Lichenotheliaceae
|
| LICHE5 | Lichenothelia D. Hawksw. | lichenothelia | Lichenotheliaceae
|
| LIRI3 | Lichenothrix riddlei Henssen | Pyrenothrix nigra | Pyrenotrichaceae
|
| LICO15 | Lichina confinis (O. F. Muller) C. Agardh | seaweed lichen | Lichinaceae
|
| LIWI2 | Lichina willeyi (Tuck.) Henssen | Willey's seaweed lichen | Lichinaceae
|
| LICHI | Lichina C. Agardh | seaweed lichen | Lichinaceae
|
| LIAM6 | Lichinella americana Henssen | | Lichinaceae
|
| LICR3 | Lichinella cribellifera (Nyl.) Henssen | | Lichinaceae
|
| LIME10 | Lichinella melamphylla (Tuck.) | | Lichinaceae
|
| LIMI14 | Lichinella minnesotensis (Fink) | | Lichinaceae
|
| LINI2 | Lichinella nigritella (Lettau) Moreno & Egea | | Lichinaceae
|
| LIST7 | Lichinella stipatula Nyl. | | Lichinaceae
|
| LICHI2 | Lichinella Nyl. | lichinella | Lichinaceae
|
| LICA33 | Lichinodium canadense Henssen | | Lichinaceae
|
| LISA6 | Lichinodium saxicola Henssen | | Lichinaceae
|
| LISI4 | Lichinodium sirosiphoideum Nyl. | | Lichinaceae
|
| LICHI3 | Lichinodium Nyl. | lichinodium | Lichinaceae
|
| LIBI9 | Lidbeckia bipinnata Thunb. | Lasiospermum bipinnatum | Asteraceae
|
| LIAR7 | Lidia arctica (Stev. ex Ser.) A.& D. L�ve | Minuartia arctica | Caryophyllaceae
|
| LIBI6 | Lidia biflora (L.) A.& D. L�ve | Minuartia biflora | Caryophyllaceae
|
| LIOB4 | Lidia obtusiloba (Rydb.) A.& D. L�ve | Minuartia obtusiloba | Caryophyllaceae
|
| LIYU | Lidia yukonensis (Hult�n) A.& D. L�ve | Minuartia yukonensis | Caryophyllaceae
|
| LIAM4 | Ligularia amplectens (Gray) W.A. Weber | Senecio amplectens var. amplectens | Asteraceae
|
| LIBIH | Ligularia bigelovii (Gray) W.A. Weber var. hallii (Gray) W.A. Weber | Senecio bigelovii var. hallii | Asteraceae
|
| LIBI8 | Ligularia bigelovii (Gray) W.A. Weber | Senecio bigelovii var. bigelovii | Asteraceae
|
| LIHO2 | Ligularia holmii (Greene) W.A. Weber | Senecio amplectens var. holmii | Asteraceae
|
| LIPO5 | Ligularia porteri (Greene) W.A. Weber | Packera porteri | Asteraceae
|
| LIPU6 | Ligularia pudica (Greene) W.A. Weber | Senecio pudicus | Asteraceae
|
| LISO | Ligularia soldanella (Gray) W.A. Weber | Senecio soldanella | Asteraceae
|
| LITA | Ligularia taraxacoides (Gray) W.A. Weber | Senecio taraxacoides | Asteraceae
|
| LIWE4 | Ligularia websteri (Greenm.) W.A. Weber | Senecio neowebsteri | Asteraceae
|
| LIAP | Ligusticum apiifolium (Nutt. ex Torr. & Gray) Gray | celeryleaf licorice-root | Apiaceae
|
| LICA23 | Ligusticum caeruleimontanum St. John | Ligusticum canbyi | Apiaceae
|
| LICA15 | Ligusticum calderi Mathias & Constance | Calder's licorice-root | Apiaceae
|
| LICA | Ligusticum californicum Coult. & Rose | California licorice-root | Apiaceae
|
| LICA16 | Ligusticum canadense (L.) Britt. | Canadian licorice-root | Apiaceae
|
| LICA2 | Ligusticum canbyi Coult. & Rose | Canby's licorice-root | Apiaceae
|
| LIFIT | Ligusticum filicinum S. Wats. var. tenuifolium (S. Wats.) Mathias & Constance | Ligusticum tenuifolium | Apiaceae
|
| LIFI | Ligusticum filicinum S. Wats. | fernleaf licorice-root | Apiaceae
|
| LIGR | Ligusticum grayi Coult. & Rose | Gray's licorice-root | Apiaceae
|
| LIHU4 | Ligusticum hultenii Fern. | Ligusticum scoticum ssp. hultenii | Apiaceae
|
| LILE6 | Ligusticum leibergii Coult. & Rose | Ligusticum canbyi | Apiaceae
|
| LIMUA | Ligusticum mutellinoides (Crantz) Willar ssp. alpinum auct. non (Ledeb.) Thellung | Podistera macounii | Apiaceae
|
| LIPOB | Ligusticum porteri Coult. & Rose var. brevilobum (Rydb.) Mathias & Constance | Porter's licorice-root | Apiaceae
|
| LIPOP | Ligusticum porteri Coult. & Rose var. porteri | Porter's licorice-root | Apiaceae
|
| LIPO | Ligusticum porteri Coult. & Rose | Porter's licorice-root | Apiaceae
|
| LISCH | Ligusticum scoticum L. ssp. hultenii (Fern.) Calder & Taylor | Hulten's licorice-root | Apiaceae
|
| LISCS2 | Ligusticum scoticum L. ssp. scoticum | Scottish licorice-root | Apiaceae
|
| LISCH3 | Ligusticum scoticum L. var. hultenii (Fern.) Boivin | Ligusticum scoticum ssp. hultenii | Apiaceae
|
| LISC3 | Ligusticum scoticum L. | Scottish licorice-root | Apiaceae
|
| LITE2 | Ligusticum tenuifolium S. Wats. | Idaho licorice-root | Apiaceae
|