Complete list of species
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| scientific name | common name(s) | image gallery |
| Listera cordata var. nephrophylla | Heartleaf Twayblade | |
| Listera smallii | Kidneyleaf Twayblade Appalachian Twayblade | |
| Listera ×veltmanii | Twayblade | |
| Lithophragma affine | Common Woodland Star San Francisco Woodland Star San Francisco Woodland-star San Francisco Woodlandstar | |
| Lithophragma affine ssp. affine | Common Woodland Star San Francisco Woodland Star San Francisco Woodland-star San Francisco Woodlandstar | |
| Lithophragma affine ssp. mixtum | Common Woodland Star San Francisco Woodland Star San Francisco Woodland-star San Francisco Woodlandstar | |
| Lithophragma bolanderi | Bolander's Woodland-star Bolander's Woodlandstar Bolander’s Woodland Star Hillstar Sierra Star | |
| Lithophragma campanulatum | Siskiyou Mountain Woodland Star Siskiyou Mountain Woodland-star Siskiyou Mountain Woodlandstar | |
| Lithophragma cymbalaria | Mission Star Mission Woodland Star Mission Woodland-star Mission Woodlandstar | |
| Lithophragma glabrum | Bulbous Woodland Star Bulbiferous Prairie Star Bulblet Prairie Star | |
| Lithophragma heterophyllum | Hill Star Hillside Woodland Star Hillside Woodland-star Hillside Woodlandstar | |
| Lithophragma maximum | San Clemente Island Woodland Star San Clemente Island Woodland-star San Clemente Island Woodlandstar | |
| Lithophragma parviflorum | Smallflower Woodland-star Prairie Star Prairie Rockstar | |
| Lithophragma parviflorum var. parviflorum | Pink Woodland Star Pink Woodlandstar Smallflower Woodland Star Smallflower Woodland-star | |
| Lithophragma parviflorum var. trifoliatum | Prairie Woodland Star Prairie Woodland-star Prairie Woodlandstar | |
| Lithophragma tenellum | Slender Woodland Star Slender Woodland-star Slender Woodlandstar | |
| Lithospermum californicum | California Stoneseed California Gromwell | |
| Lithospermum calycosum | Chinati Stoneseed Chinati Gromwell | |
| Lithospermum canescens | Hoary Puccoon | |
| Lithospermum caroliniense | Carolina Puccoon Hairy Puccoon Hispid Gromwell | |
| Lithospermum caroliniense var. caroliniense | Carolina Puccoon Carolina Gromwell Hairy Puccoon | |
| Lithospermum caroliniense var. croceum | Carolina Puccoon Golden Puccoon Hispid Gromwell Plains Puccoon | |
| Lithospermum cobrense | Smooththroat Stoneseed Smooththroat Gromwell Smooth-throat Gromwell Smooth Pucoon | |
| Lithospermum confine | Arizona Stoneseed Arizona Gromwell | |
| Lithospermum incisum | Fringed Puccoon Golden Puccoon Narrowleaf Puccoon Narrow-leaved Puccoon Puccoon Narrowleaf Gromwell Fringed Gromwell Narrowleaf Stoneseed | |
| Lithospermum latifolium | American Stoneseed | |
| Lithospermum matamorense | Rough Stoneseed | |
| Lithospermum mirabile | San Antonio Stoneseed | |
| Lithospermum multiflorum | Manyflowered Stoneseed | |
| Lithospermum obtusifolium | Roundleaf Stoneseed Roundleaf Gromwell | |
| Lithospermum parksii | Parks' Stoneseed Parks' Gromwell | |
| Lithospermum parksii var. parksii | Parks' Stoneseed Parks' Gromwell | |
| Lithospermum parksii var. rugulosum | Parks' Stoneseed Parks' Gromwell | |
| Lithospermum ruderale | Western Stoneseed Western Gromwell | |
| Lithospermum tuberosum | Tuberous Stoneseed Southern Stoneseed Tuberous Gromwell | |
| Lithospermum viride | Green Stoneseed Green Gromwell | |
| Litsea aestivalis | Pondspice | |
| Littorella uniflora | American Shoreweed | |
| Lloydia serotina | Common Alplily Alplily | |
| Lloydia serotina var. flava | Alpine Lily Golden Alpine Llily Golden Alpine-lily | |
| Lloydia serotina var. serotina | Common Alplily | |
| Lobelia amoena | Southern Lobelia | |
| Lobelia amoena var. amoena | Southern Lobelia | |
| Lobelia amoena var. glandulifera | Southern Lobelia | |
| Lobelia anatina | Apache Lobelia Southwestern Blue Lobelia | |
| Lobelia appendiculata | Pale Lobelia | |
| Lobelia appendiculata var. appendiculata | Pale Lobelia | |
| Lobelia appendiculata var. gattingeri | Gattinger's Lobelia | |
| Lobelia berlandieri | Berlandier's Lobelia Berlandier Lobelia | |
| Lobelia berlandieri var. berlandieri | Berlandier's Lobelia Berlandier Lobelia | |
| Lobelia berlandieri var. brachypoda | Berlandier's Lobelia Blue Lobelia | |
| Lobelia boykinii | Boykin's Lobelia | |
| Lobelia brevifolia | Shortleaf Lobelia | |
| Lobelia canbyi | Canby's Lobelia | |
| Lobelia cardinalis | Cardinal Flower | |
| Lobelia dortmanna | Dortmann's Cardinal Flower Water Lobelia | |
| Lobelia dunbarii | Waihanau Lobelia Rock's Lobelia | |
| Lobelia dunbarii ssp. dunbarii | Waihanau Lobelia | |
| Lobelia dunbarii ssp. paniculata | Waihanau Lobelia | |
| Lobelia dunnii | Dunn's Lobelia Blue Lobelia | |
| Lobelia dunnii var. serrata | Dunn's Lobelia Blue Lobelia | |
| Lobelia elongata | Longleaf Lobelia Long-leaf Lobelia Blue Lobelia | |
| Lobelia feayana | Bay Lobelia | |
| Lobelia fenestralis | Fringeleaf Lobelia | |
| Lobelia flaccidifolia | Foldear Lobelia Fold-ear Lobelia | |
| Lobelia floridana | Florida Lobelia | |
| Lobelia gaudichaudii | Koolau Range Lobelia Gaudichaud's Lobelia | |
| Lobelia gaudichaudii ssp. gaudichaudii | Koolau Range Lobelia | |
| Lobelia gaudichaudii ssp. koolauensis | Koolau Range Lobelia | |
| Lobelia glandulosa | Glade Lobelia | |
| Lobelia gloria-montis | Bog Lobelia Hawaiian Lobelia | |
| Lobelia grayana | Haleakala Lobelia Gray's Lobelia | |
| Lobelia hillebrandii | Maui Lobelia Hillebrand's Lobelia | |
| Lobelia homophylla | Pineland Lobelia | |
| Lobelia hypoleuca | Kuhi'aikamo'owahie Liua Moowahie Opelu | |
| Lobelia inflata | Indian Tobacco | |
| Lobelia kalmii | Ontario Lobelia | |
| Lobelia kauaensis | Lava Lobelia Pue | |
| Lobelia laxiflora | Sierra Madre Lobelia Mexican Lobelia Mexican Cardinalflower | |
| Lobelia laxiflora var. angustifolia | Sierra Madre Lobelia Mexican Lobelia Mexican Cardinalflower | |
| Lobelia monostachya | Waianae Range Lobelia | |
| Lobelia niihauensis | Niihau Lobelia | |
| Lobelia nuttallii | Nuttall's Lobelia | |
| Lobelia oahuensis | Oahu Lobelia | |
| Lobelia paludosa | White Lobelia | |
| Lobelia puberula | Downy Lobelia | |
| Lobelia puberula var. mineolana | Downy Lobelia | |
| Lobelia puberula var. pauciflora | Downy Lobelia Reverchon's Lobelia | |
| Lobelia puberula var. puberula | Downy Lobelia | |
| Lobelia puberula var. simulans | Downy Lobelia | |
| Lobelia remyi | Grayleaf Lobelia Remy's Lobelia | |
| Lobelia siphilitica | Great Blue Lobelia | |
| Lobelia siphilitica var. ludoviciana | Great Blue Lobelia Great Lobelia | |
| Lobelia siphilitica var. siphilitica | Great Blue Lobelia | |
| Lobelia spicata | Pale-spike Lobelia | |
| Lobelia spicata var. campanulata | Palespike Lobelia Pale-spike Lobelia Pale-spiked Lobelia | |
| Lobelia spicata var. hirtella | Palespike Lobelia | |
| Lobelia spicata var. leptostachys | Palespike Lobelia Pale-spike Lobelia Pale-spiked Lobelia | |
| Lobelia spicata var. scaposa | Palespike Lobelia Pale-spike Lobelia Pale-spiked Lobelia | |
| Lobelia spicata var. spicata | Palespike Lobelia | |
| scientific name | common name(s) | image gallery |
