| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| LIGUS | Ligusticum L. | licorice-root | Apiaceae
|
| LIAM | Ligustrum amurense Carr. | Amur privet | Oleaceae
|
| LIJA | Ligustrum japonicum Thunb. | Japanese privet | Oleaceae
|
| LILU2 | Ligustrum lucidum Ait. f. | glossy privet | Oleaceae
|
| LIOB | Ligustrum obtusifolium Sieb. & Zucc. | border privet | Oleaceae
|
| LIOV | Ligustrum ovalifolium Hassk. | California privet | Oleaceae
|
| LIQU2 | Ligustrum quihoui Carr. | waxyleaf privet | Oleaceae
|
| LISE7 | Ligustrum sempervirens (Franch.) Linglesh. | privet | Oleaceae
|
| LISI | Ligustrum sinense Lour. | Chinese privet | Oleaceae
|
| LIVI7 | Ligustrum villosum May | Ligustrum sinense | Oleaceae
|
| LIVU | Ligustrum vulgare L. | European privet | Oleaceae
|
| LIGUS2 | Ligustrum L. | privet | Oleaceae
|
| LISC4 | Lilaea scilloides (Poir.) Hauman | awl-leaf lilaea | Juncaginaceae
|
| LISU9 | Lilaea subulata Bonpl. | Lilaea scilloides | Juncaginaceae
|
| LILAE | Lilaea Bonpl. | lilaea | Juncaginaceae
|
| LIAT | Lilaeopsis attenuata auct. non (Hook. & Arn.) Fern. | Lilaeopsis carolinensis | Apiaceae
|
| LICA31 | Lilaeopsis carolinensis Coult. & Rose | Carolina grasswort | Apiaceae
|
| LICH | Lilaeopsis chinensis (L.) Kuntze | eastern grasswort | Apiaceae
|
| LILI7 | Lilaeopsis lineata (Michx.) Greene | Lilaeopsis chinensis | Apiaceae
|
| LIMA7 | Lilaeopsis masonii Mathias & Constance | mudflat quillplant | Apiaceae
|
| LIOC | Lilaeopsis occidentalis Coult. & Rose | western grasswort | Apiaceae
|
| LIRE | Lilaeopsis recurva A.W. Hill | Lilaeopsis schaffneriana var. recurva | Apiaceae
|
| LISCR | Lilaeopsis schaffneriana (Schlecht.) Coult. & Rose var. recurva (A.W. Hill) Affolter | Schaffner's grasswort | Apiaceae
|
| LISC7 | Lilaeopsis schaffneriana (Schlecht.) Coult. & Rose | Schaffner's grasswort | Apiaceae
|
| LILAE2 | Lilaeopsis Greene | grasswort | Apiaceae
|
| LIVI4 | Liliorhiza viridea (Kellogg) Kellogg | Fritillaria viridea | Liliaceae
|
| LIAN7 | Lilium andinum Nutt. | Lilium philadelphicum var. andinum | Liliaceae
|
| LIBO | Lilium bolanderi S. Wats. | Bolander's lily | Liliaceae
|
| LIBU | Lilium bulbiferum L. | orange lily | Liliaceae
|
| LICA28 | Lilium camschatcense L. | Fritillaria camschatcensis | Liliaceae
|
| LICAC | Lilium canadense L. ssp. canadense | Canada lily | Liliaceae
|
| LICAE | Lilium canadense L. ssp. editorum (Fern.) Wherry | Canada lily | Liliaceae
|
| LICAM | Lilium canadense L. ssp. michiganense (Farw.) Boivin & Cody | Lilium michiganense | Liliaceae
|
| LICAS2 | Lilium canadense L. ssp. superbum (L.) Boivin & Cody | Lilium superbum | Liliaceae
|
| LICAS3 | Lilium canadense L. ssp. superum (L.) Baker | Lilium superbum | Liliaceae
|
| LICAE2 | Lilium canadense L. var. editorum Fern. | Lilium canadense ssp. editorum | Liliaceae
|
| LICAP | Lilium canadense L. var. parviflorum Hook. | Lilium columbianum | Liliaceae
|
| LICAR2 | Lilium canadense L. var. rubrum hort. ex T. Moore | Lilium canadense ssp. editorum | Liliaceae
|
| LICAU | Lilium canadense L. var. umbelliferum (Farw.) Boivin | Lilium michiganense | Liliaceae
|
| LICA3 | Lilium canadense L. | Canada lily | Liliaceae
|
| LICA22 | Lilium candidum L. | Madonna lily | Liliaceae
|
| LICA25 | Lilium carolinianum Michx., non Bosc ex Lam. | Lilium michauxii | Liliaceae
|
| LICAA | Lilium catesbaei Walt. ssp. asperellum Wherry | pine lily | Liliaceae
|
| LICAC2 | Lilium catesbaei Walt. ssp. catesbaei | pine lily | Liliaceae
|
| LICAL | Lilium catesbaei Walt. var. longii Fern. | Lilium catesbaei ssp. catesbaei | Liliaceae
|
| LICA4 | Lilium catesbaei Walt. | pine lily | Liliaceae
|
| LICO | Lilium columbianum hort. ex Baker | Columbian lily | Liliaceae
|
| LIFA4 | Lilium fairchildii M.E. Jones | Lilium humboldtii ssp. ocellatum | Liliaceae
|
| LIFO2 | Lilium formosanum A. Wallace | Formosa lily | Liliaceae
|
| LIFO3 | Lilium fortunofulgidum Roane & Henry | Lilium michauxii | Liliaceae
|
| LIFR5 | Lilium fresnense (Eastw.) Eastw. | Lilium kelleyanum | Liliaceae
|
| LIGA3 | Lilium gazarubrum Roane & Henry | Lilium superbum | Liliaceae
|
| LIGR2 | Lilium grayi S. Wats. | Gray's lily | Liliaceae
|
| LIHE6 | Lilium henryi Baker | Henry's lily | Liliaceae
|
| LIHUH | Lilium humboldtii Roezl & Leichtl. ex Duchartre ssp. humboldtii | Humboldt's lily | Liliaceae
|
| LIHUO2 | Lilium humboldtii Roezl & Leichtl. ex Duchartre ssp. ocellatum (Kellogg) Thorne | Humboldt's lily | Liliaceae
|
| LIHUB | Lilium humboldtii Roezl & Leichtl. ex Duchartre var. bloomerianum (Kellogg) Jepson | Lilium humboldtii ssp. ocellatum | Liliaceae
|
| LIHUO | Lilium humboldtii Roezl & Leichtl. ex Duchartre var. ocellatum (Kellogg) Kellogg ex Elwes | Lilium humboldtii ssp. ocellatum | Liliaceae
|
| LIHU | Lilium humboldtii Roezl & Leichtl. ex Duchartre | Humboldt's lily | Liliaceae
|
| LIIR | Lilium iridollae Henry | panhandle lily | Liliaceae
|
| LIKE | Lilium kelleyanum J.G. Lemmon | Kelley's lily | Liliaceae
|
| LIKE2 | Lilium kelloggii Purdy | Kellogg's lily | Liliaceae
|
| LILA8 | Lilium lancifolium Thunb. | tiger lily | Liliaceae
|
| LILO3 | Lilium longiflorum Thunb. | Easter lily | Liliaceae
|
| LIMA | Lilium maritimum Kellogg | coast lily | Liliaceae
|
| LIMA12 | Lilium mary-henryae Roane & Henry | Lilium superbum | Liliaceae
|
| LIMI | Lilium michauxii Poir. | Carolina lily | Liliaceae
|
| LIMIU | Lilium michiganense Farw. var. uniflorum Farw. | Lilium michiganense | Liliaceae
|
| LIMI9 | Lilium michiganense Farw. | Michigan lily | Liliaceae
|
| LIMO6 | Lilium montanum A. Nels. | Lilium philadelphicum var. andinum | Liliaceae
|
| LINES2 | Lilium nevadense Eastw. var. shastense Eastw. | Lilium kelleyanum | Liliaceae
|
| LINE7 | Lilium nevadense Eastw. | Lilium kelleyanum | Liliaceae
|
| LIOC2 | Lilium occidentale Purdy | western lily | Liliaceae
|
| LIPAP2 | Lilium pardalinum Kellogg ssp. pardalinum | leopard lily | Liliaceae
|
| LIPAP5 | Lilium pardalinum Kellogg ssp. pitkinense (Beane & Vollmer) Skinner, comb. nov. ined. | Pitkin Marsh lily | Liliaceae
|
| LIPAS | Lilium pardalinum Kellogg ssp. shastense (Eastw.) Skinner | Shasta lily | Liliaceae
|
| LIPAV | Lilium pardalinum Kellogg ssp. vollmeri (Eastw.) Skinner | Vollmer's lily | Liliaceae
|
| LIPAW2 | Lilium pardalinum Kellogg ssp. wigginsii (Beane & Vollmer) Skinner, comb. nov. ined. | Wiggins' lily | Liliaceae
|
| LIPA | Lilium pardalinum Kellogg | leopard lily | Liliaceae
|
| LIPAK | Lilium parryi S. Wats. var. kessleri A. Davids. | Lilium parryi | Liliaceae
|
| LIPA2 | Lilium parryi S. Wats. | lemon lily | Liliaceae
|
| LIPA3 | Lilium parvum Kellogg | Sierra tiger lily | Liliaceae
|
| LIPHA | Lilium philadelphicum L. var. andinum (Nutt.) Ker-Gawl. | wood lily | Liliaceae
|
| LIPHM | Lilium philadelphicum L. var. montanum (A. Nels.) Wherry | Lilium philadelphicum var. andinum | Liliaceae
|
| LIPHP | Lilium philadelphicum L. var. philadelphicum | wood lily | Liliaceae
|
| LIPH | Lilium philadelphicum L. | wood lily | Liliaceae
|
| LIPH4 | Lilium philippinense Baker | Philippine lily | Liliaceae
|
| LIPI | Lilium pitkinense Beane & Vollmer | Lilium pardalinum ssp. pitkinense | Liliaceae
|
| LIPS | Lilium �pseudograyi Grove (pro sp.) | | Liliaceae
|
| LIPU7 | Lilium pudicum Pursh | Fritillaria pudica | Liliaceae
|
| LIRE6 | Lilium regale E.E. Wilson | regal lily | Liliaceae
|
| LIRU | Lilium rubescens S. Wats. | redwood lily | Liliaceae
|
| LISUC | Lilium superbum L. var. carolinianum (Michx.) Chapman | Lilium michauxii | Liliaceae
|
| LISU | Lilium superbum L. | turk's-cap lily | Liliaceae
|
| LITI | Lilium tigrinum Ker-Gawl. | Lilium lancifolium | Liliaceae
|
| LIUM2 | Lilium umbellatum Pursh | Lilium philadelphicum var. andinum | Liliaceae
|
| LIVO | Lilium vollmeri Eastw. | Lilium pardalinum ssp. vollmeri | Liliaceae
|
| LIWAM | Lilium washingtonianum Kellogg var. minus Purdy | Lilium washingtonianum var. washingtonianum | Liliaceae
|
| LIWAP | Lilium washingtonianum Kellogg var. purpurascens Stearn | Cascade lily | Liliaceae
|
| LIWAW | Lilium washingtonianum Kellogg var. washingtonianum | Washington lily | Liliaceae
|
| LIWA | Lilium washingtonianum Kellogg | Washington lily | Liliaceae
|