Complete list of species
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| scientific name | common name(s) | image gallery |
| Labordia triflora | Kamakahala Three-flower Labordia | |
| Labordia venosa | Kamakahala Maui Labordia | |
| Labordia waialealae | Kamakahala Kamakahala Lau Li'I | |
| Labordia waiolani | Kamakahala | |
| Lachnanthes caroliana | Carolina Redroot Paint Root | |
| Lachnocaulon anceps | Whitehead Bogbutton Hairy Pipewort Hat-pins Bog Bachelor's-buttons | |
| Lachnocaulon beyrichianum | Southern Bogbutton | |
| Lachnocaulon digynum | Panhandle Bogbutton Pineland Bogbutton Pineland Hat-pins Tiny Bog Buttons | |
| Lachnocaulon engleri | Engler's Bogbutton Engler's Hat-pins | |
| Lachnocaulon minus | Small's Bogbutton Small's Hat-pins | |
| Lactuca biennis | Tall Blue Lettuce | |
| Lactuca canadensis | Canada Lettuce Wild Lettuce | |
| Lactuca floridana | Woodland Lettuce Florida Lettuce | |
| Lactuca floridana var. floridana | Woodland Lettuce | |
| Lactuca floridana var. villosa | Woodland Lettuce | |
| Lactuca graminifolia | Grassleaf Lettuce | |
| Lactuca graminifolia var. arizonica | Grassleaf Lettuce | |
| Lactuca graminifolia var. graminifolia | Grassleaf Lettuce | |
| Lactuca hirsuta | Hairy Lettuce | |
| Lactuca hirsuta var. albiflora | Hairy Lettuce | |
| Lactuca hirsuta var. hirsuta | Hairy Lettuce | |
| Lactuca hirsuta var. sanguinea | Hairy Lettuce Red-flowered Wild Lettuce | |
| Lactuca ludoviciana | Western Wild Lettuce Louisiana Wild Lettuce Prairie Lettuce Prairie Wild Lettuce Biannual Lettuce | |
| Lactuca tatarica | Blue Lettuce | |
| Lactuca tatarica var. pulchella | Blue Lettuce | |
| Lactuca ×morssii | Lettuce | |
| Laennecia coulteri | Conyza Coulter's Horseweed Coulter's Woolwort Annual Horsetail | |
| Laennecia eriophylla | Cochise Horseweed | |
| Laennecia filaginoides | Trans-Pecos Horseweed | |
| Laennecia schiedeana | Pineland Horseweed | |
| Laennecia sophiifolia | Leafy Horseweed | |
| Laennecia turnerorum | Turner's Horseweed | |
| Lagascea decipiens | Doll's Head Silk-leaf Velvet-bush | |
| Lagophylla diabolensis | Diablo Hareleaf Diablo Range Hare-leaf | |
| Lagophylla dichotoma | Forked Hareleaf | |
| Lagophylla glandulosa | Glandular Hareleaf | |
| Lagophylla minor | Lesser Hareleaf Little Hareleaf | |
| Lagophylla ramosissima | Branched Lagophylla Common Hareleaf | |
| Lagophylla ramosissima ssp. congesta | Branched Lagophylla Common Hareleaf | |
| Lagophylla ramosissima ssp. ramosissima | Branched Lagophylla Common Hareleaf | |
| Lagotis glauca | Glaucous Weaselsnout Weaselsnout | |
| Lagotis minor | Little Weaselsnout | |
| Laguncularia racemosa | White Mangrove | |
| Langloisia setosissima | Great Basin Langloisia | |
| Langloisia setosissima ssp. punctata | Great Basin Langloisia Spotted Langloisia | |
| Langloisia setosissima ssp. setosissima | Great Basin Langloisia Bristly Langloisia | |
| Lantana achyranthifolia | Brushland Shrubverbena Mexican Marjoram Veinyleaf Lantana | |
| Lantana canescens | Hammock Shrubverbena | |
| Lantana depressa | Pineland Trailing Lantana Gold Lantana Pineland Lantana Rockland Shrub Verbena | |
| Lantana depressa var. depressa | Pineland Trailing Lantana Gold Lantana Pineland Lantana Rockland Shrub Verbena Depressed Shrub Verbena | |
| Lantana depressa var. floridana | Florida Shrubverbena Pineland Lantana | |
| Lantana depressa var. sanibelensis | Pineland Lantana Sanibel Shrubverbena | |
| Lantana involucrata | Buttonsage Button-sage | |
| Lantana involucrata var. involucrata | Button Sage Buttonsage | |
| Lantana involucrata var. odorata | Fragrant Button Sage Fragrant Buttonsage | |
| Lantana urticoides | Texas Lantana Calico Bush | |
| Lantana velutina | Velvet Shrubverbena Velvet Lantana | |
| Laportea canadensis | Canadian Woodnettle Wood Nettle | |
| Lappula cenchrusoides | Great Plains Stickseed Great Plains Sheepburr Stickseed | |
| Lappula occidentalis | Flatspine Stickseed | |
| Lappula occidentalis var. cupulata | Flatspine Stickseed Western Stickseed | |
| Lappula occidentalis var. occidentalis | Flatspine Stickseed | |
| Larix laricina | Tamarack American Larch Hacmatack Black Larch | |
| Larix lyallii | Subalpine Larch | |
| Larix occidentalis | Western Larch Western Tamarack | |
| Larrea tridentata | Creosote Bush Greasewood Hediondilla Governadora Guamis | |
| Larrea tridentata var. arenaria | Creosote Bush Dune Creosote Bush South American Creosote Bush | |
| Larrea tridentata var. tridentata | Creosote Bush Greasewood Gobernadora Hediondilla | |
| Lasiacis divaricata | Small-cane Smallcane | |
| Lasianthaea podocephala | San Pedro Daisy | |
| Lastarriaea coriacea | Leather Spineflower Leather-spineflower | |
| Lasthenia burkei | Burke's Baeria Burke's Goldfields | |
| Lasthenia californica | California Goldfields | |
| Lasthenia californica ssp. bakeri | Baker's Goldfields | |
| Lasthenia californica ssp. californica | California Goldfields | |
| Lasthenia californica ssp. macrantha | Perennial Goldfields | |
| Lasthenia chrysantha | Alkali Goldfields Alkalisink Goldfields | |
| Lasthenia conjugens | Contra Costa Goldfields | |
| Lasthenia coronaria | Royal Goldfields | |
| Lasthenia debilis | Greene's Goldfields | |
| Lasthenia ferrisiae | Alkali Goldfields Ferris' Goldfields | |
| Lasthenia fremontii | Fremont's Goldfields Vernal Pool Goldfields | |
| Lasthenia glaberrima | Smooth Goldfields | |
| Lasthenia glabrata | Yellowray Goldfields Yellow-ray Goldfields California Sunshine | |
| Lasthenia glabrata ssp. coulteri | Coulter's Goldfields Goldfields | |
| Lasthenia glabrata ssp. glabrata | Yellow-ray Goldfields Yellowray Goldfields | |
| Lasthenia gracilis | Common Goldfields Needle Goldfields | |
| Lasthenia leptalea | Salinas Valley Goldfields | |
| Lasthenia maritima | Maritime Goldfields Seaside Goldfields | |
| Lasthenia microglossa | Small Rayed Goldfields Small-ray Goldfields Smallray Goldfields | |
| Lasthenia minor | Coastal Goldfields | |
| Lasthenia ornduffii | Ornduff's Goldfields | |
| Lasthenia platycarpha | Alkali Goldfields | |
| Lathrocasis tenerrima | Delicate Gilia Annual Gily-flower | |
| Lathyrus biflorus | Twoflower Pea | |
| Lathyrus bijugatus | Drypark Pea | |
| Lathyrus brachycalyx | Bonneville Pea | |
| Lathyrus brachycalyx ssp. brachycalyx | Bonneville Pea | |
| Lathyrus brachycalyx ssp. zionis | Bush Pea Bush Peavine Zion Sweetpea Intermountain Peavine | |
| Lathyrus delnorticus | Del Norte Pea | |
| scientific name | common name(s) | image gallery |
