Complete list of species
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| scientific name | common name(s) | image gallery |
| Lechea maritima | Beach Pinweed | |
| Lechea maritima var. maritima | Beach Pinweed | |
| Lechea maritima var. virginica | Virginia Pinweed Virginian Beach Pinweed | |
| Lechea mensalis | Chisos Mountain Pinweed | |
| Lechea minor | Thyme-leaf Pinweed Thymeleaf Pinweed Thymeleaved Pinweed | |
| Lechea mucronata | Hairy Pinweed | |
| Lechea pulchella | Leggett's Pinweed | |
| Lechea pulchella var. moniliformis | Bead Pinweed Beaded Pinweed Leggett's Pinweed | |
| Lechea pulchella var. pulchella | Leggett's Pinweed | |
| Lechea racemulosa | Illinois Pinweed Oblong-fruited Pinweed | |
| Lechea san-sabeana | San Saba Pinweed | |
| Lechea sessiliflora | Pineland Pinweed | |
| Lechea stricta | Bushy Pinweed Prairie Pinweed Upright Pinweed | |
| Lechea tenuifolia | Narrowleaf Pinweed | |
| Lechea torreyi | Piedmont Pinweed Sandhill Pinweed | |
| Ledum glandulosum | Western Labrador Tea Trapper's Tea | |
| Ledum groenlandicum | Bog Labrador Tea Rusty Labrador Tea Labrador Tea Hudson's Bay Tea Muskeg Tea | |
| Ledum palustre | Marsh Labrador Tea Northern Labrador Tea Narrow-leaf Labrador Tea | |
| Ledum palustre ssp. decumbens | Marsh Labrador Tea | |
| Ledum ×columbianum | Labrador Tea Western Labrador Tea | |
| Leersia hexandra | Southern Cutgrass | |
| Leersia lenticularis | Catchfly Grass Oatmeal Grass | |
| Leersia monandra | Cut Rice Grass Bunch Cutgrass | |
| Leersia oryzoides | Rice Cutgrass Rice Cut Grass | |
| Leersia virginica | Whitegrass | |
| Legenere limosa | False Venus' Looking Glass False Venus' Looking-glass | |
| Leibnitzia lyrata | Seeman's Sunbonnets | |
| Leiophyllum buxifolium | Sandmyrtle Sand-myrtle | |
| Leitneria floridana | Corkwood | |
| Leitneria pilosa | Hairy Corkwood | |
| Leitneria pilosa ssp. ozarkana | Ozark Hairy Corkwood Western Corkwood Velvet-leaf Corkwood | |
| Leitneria pilosa ssp. pilosa | Hairy Corkwood Western Corkwood Velvet-leaf Corkwood Texas Corkwood | |
| Lellingeria saffordii | Safford's Lellingeria | |
| Lemna aequinoctialis | Lesser Duckweed | |
| Lemna gibba | Gibbous Duckweed Inflated Duckweed Swollen Duckweed | |
| Lemna minor | Common Duckweed | |
| Lemna minuta | Least Duckweed | |
| Lemna obscura | Little Duckweed | |
| Lemna perpusilla | Minute Duckweed | |
| Lemna trisulca | Star Duckweed | |
| Lemna turionifera | Turion Duckweed | |
| Lemna valdiviana | Valdivia Duckweed | |
| Lenophyllum texanum | Coastal Stonecrop | |
| Lepanthopsis melanantha | Crimson Pygmy Orchid Tiny Orchid | |
| Lepechinia calycina | Woodbalm California Pitcher Plant Pitcher Sage | |
| Lepechinia cardiophylla | Santa Ana Pitchersage Heart Leaved Pitcher Sage Heart-leaved Pitcher Sage Heart-leaf Pitcher-sage | |
| Lepechinia fragrans | Island Pitchersage El Tigre Pitcher Sage Fragrant Pitcher Sage | |
| Lepechinia ganderi | San Diego Pitchersage Gander's Pitcher Sage Gander's Pitcher-sage | |
| Lepechinia hastata | Pakaha Baja Pitcher Sage False Salvia Pitcher Sage | |
| Lepechinia rossii | Ross' Pitcher Sage Ross's Pitcher-sage | |
| Lepidium alyssoides | Mesa Pepperwort Mesa Pepperweed Southern Pepperweed | |
| Lepidium alyssoides var. alyssoides | Mesa Pepperwort Southern Pepperweed | |
| Lepidium alyssoides var. angustifolium | Mesa Pepperwort Southern Pepperweed | |
| Lepidium alyssoides var. eastwoodiae | Mesa Pepperweed Mesa Pepperwort | |
| Lepidium alyssoides var. junceum | Mesa Pepperwort Southern Pepperweed | |
| Lepidium arbuscula | Anaunau Waianae Range Pepperwort | |
| Lepidium austrinum | Southern Peppergrass Southern Pepperwort | |
| Lepidium barnebyanum | Barneby Ridge-cress Barneby's Pepperweed Barneby's Pepperwort | |
| Lepidium bidentatum | Anaunau Kunana Pepperwort Naunau Peppergrass Pepperweed | |
| Lepidium bidentatum var. owaihiense | Anaunau Kunana Pepperwort Naunau Peppergrass Pepperweed | |
| Lepidium crenatum | Alkali Pepperweed Alkaline Pepperwort | |
| Lepidium davisii | Davis' Peppercress Davis' Pepperweed Davis' Pepperwort | |
| Lepidium densiflorum | Common Pepperweed | |
| Lepidium dictyotum | Alkali Pepperweed Alkali Pepperwort Net Peppergrass Net Pepperweed | |
| Lepidium dictyotum var. acutidens | Alkali Pepperwort Net Peppergrass | |
| Lepidium dictyotum var. dictyotum | Alkali Pepperweed Alkali Pepperwort Net Peppergrass Net Pepperweed | |
| Lepidium flavum | Yellow Pepperweed Yellow Peppergrass | |
| Lepidium flavum var. felipense | Borrego Valley Peppergrass Yellow Peppergrass Yellow Pepperweed Yellow Pepperwort | |
| Lepidium flavum var. flavum | Yellow Peppergrass Yellow Pepperweed Yellow Pepperwort | |
| Lepidium fremontii | Desert Pepperweed Desert Alysum Desert Peppergrass Bush Pepperwort | |
| Lepidium fremontii var. fremontii | Bush Pepperwort Desert Alysum Desert Peppergrass Desert Pepperweed | |
| Lepidium fremontii var. stipitatum | Bush Pepperwort Desert Alysum Desert Peppergrass Desert Pepperweed | |
| Lepidium huberi | Huber's Pepperweed Huber's Pepperwort | |
| Lepidium integrifolium | Thick-leaf Pepperwort Thickleaf Pepperweed | |
| Lepidium integrifolium var. heterophyllum | Mountain Pepperwort Thickleaf Pepperweed Western Peppergrass | |
| Lepidium integrifolium var. integrifolium | Thick-leaf Pepperwort Thickleaf Pepperweed | |
| Lepidium jaredii | Jared's Peppergrass Jared's Pepperweed Jared's Pepperwort | |
| Lepidium jaredii ssp. album | Panoche Peppergrass Panoche Pepperweed Panoche Pepperwort | |
| Lepidium jaredii ssp. jaredii | Jared's Peppergrass Jared's Pepperweed Jared's Pepperwort | |
| Lepidium lasiocarpum | Shaggyfruit Pepperweed | |
| Lepidium lasiocarpum var. lasiocarpum | Hairy-pod Pepperwort Hairypod Pepperweed Shaggyfruit Pepperweed | |
| Lepidium lasiocarpum var. wrightii | Wright's Pepperweed Wright's Pepperwort | |
| Lepidium latipes | Dwarf Pepper Grass Dwarf Peppergrass San Diego Pepperweed San Diego Pepperwort | |
| Lepidium latipes var. heckardii | Heckard's Peppergrass Heckard's Pepperweed Heckard's Pepperwort | |
| Lepidium latipes var. latipes | Dwarf Pepper Grass Dwarf Peppergrass San Diego Pepperweed San Diego Pepperwort | |
| Lepidium montanum | Mountain Peppergrass Western Peppergrass Mountain Pepperweed Mountain Pepperwort Montana Pepperweed | |
| Lepidium montanum var. alpinum | Alpine Peppergrass Alpine Pepperweed Mountain Pepperplant Mountain Pepperwort | |
| Lepidium montanum var. canescens | Mountain Peppergrass Mountain Pepperplant Mountain Pepperweed Mountain Pepperwort | |
| Lepidium montanum var. cinereum | Mountain Pepperweed Mountain Peppergrass Mountain Pepperwort Mountain Pepperplant | |
| Lepidium montanum var. claronense | Mountain Peppergrass Mountain Pepperplant Mountain Pepperweed Mountain Pepperwort | |
| Lepidium montanum var. coloradense | Mountain Peppergrass Mountain Pepperplant Mountain Pepperweed Mountain Pepperwort | |
| Lepidium montanum var. glabrum | Mountain Peppergrass Mountain Pepperplant Mountain Pepperweed Mountain Pepperwort | |
| Lepidium montanum var. jonesii | Jones' Peppergrass Jones' Pepperweed Mountain Pepperplant Mountain Pepperwort | |
| Lepidium montanum var. montanum | Mountain Peppergrass Mountain Pepperplant Mountain Pepperweed Mountain Pepperwort | |
| Lepidium montanum var. neeseae | Elizabeth's Peppergrass Elizabeth's Pepperweed Mountain Pepperplant Mountain Pepperwort | |
| Lepidium montanum var. nevadense | Mountain Peppergrass Mountain Pepperplant Mountain Pepperweed Mountain Pepperwort | |
| Lepidium montanum var. tenellum | Mountain Peppergrass Mountain Pepperplant Mountain Pepperweed Mountain Pepperwort | |
| Lepidium montanum var. wyomingense | Mountain Peppergrass Mountain Pepperplant Mountain Pepperweed Mountain Pepperwort | |
| Lepidium nanum | Dwarf Pepperweed Dwarf Pepperwort | |
| Lepidium nitidum | Shining Peppergrass Shining Pepperweed Shining Pepperwort Tongue Grass | |
| scientific name | common name(s) | image gallery |
