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- La Nielle des Bles (French) 1892 (6)
- Agrostemma githago L.
- Labkraut 1900 (158)
- Galium verum L.
- Labrador bedstraw 1986 (4)
- Galium labradoricum Wiegand
- Labrador buttercup 1942-Present (50, 155)
- Ranunculus rhomboideus Goldie [also reported as: Ranunculus ovalis Raf.]
- Labrador marsh bedstraw 1913 (5)
- Galium labradoricum Wiegand
- Labrador pine 1913 (5)
- Pinus banksiana Lamb.
- Labrador reed grass 1913 (5)
- Calamagrostis stricta (Timm) Koel. ssp. inexpansa (Gray) C.W. Greene [reported as: Calamagrostis labradorica Kearney]
- Labrador Solomon-plume [Labrador Solomonplume] 1942 (155)
- Maianthemum trifolium (L.) Sloboda [reported as: Smilacina stellata Desf.]
- Lace buttons [Lace-button, Lace-buttons] 1900-1923 (5, 156, 158)
- Erigeron annuus (L.) Pers.
- Lace cactus 1937-1986 (4, 97, 109)
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f.
- Lace echinocereus 1942 (155)
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f.
- Lace grass [Lace-grass, Lacegrass] 1852-Present (3, 5, 50, 93, 94, 119, 122, 155, 163)
- Eragrostis capillaris (L.) Nees
- Lace hedgehog cactus Present (50)
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f.
- Laceflower [Lace flower, Lace-flower]
- 1894-1929 (75, 106, 156, 157, 158) Philadelphia PA
- Daucus carota L.
- Present (50)
- Ptilimnium nuttallii (DC.) Britton
- Lactucarium 1876 (92)
- Lactuca sativa L.
- Lacy germander Present (50)
- Teucrium laciniatum Torr.
- Lacy tansy-aster [Lacy tansyaster]
- Present (50)
- Machaeranthera pinnatifida (Hook.) Shinners
- Present (50)
- Machaeranthera pinnatifida (Hook.) Shinners ssp. pinnatifida
- Ladies'-dresses [Ladies' dresses] 1894 (75)
- Spiranthes Rich.
- Ladies'-laces [Ladies' laces] 1900-1913 (5, 158) variegated variety
- Phalaris arundinacea L.
- Ladies'-nightcap [Lady's nightcap, Ladies' nightcap] 1900-1923? (5, 156, 158) obsolete by 1923
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [also reported as: Convolvulus sepium L.]
- Ladies'-tobacco [Ladies' tobacco]
- 1896-1923 (5, 76, 106, 156, 158) Eastern US
- Anaphalis margaritacea (L.) Benth. & Hook
- 1932 (1)
- Antennaria Gaertner
- Ladies'-traces [Ladies' traces] 1894 (75)
- Spiranthes Rich.
- Ladies'-tresses [Ladies' tresses, Ladies tresses]
- 1894-Present (1, 50, 75, 93, 109, 138, 156)
- Spiranthes Rich. [also reported as: Ibidium Salisb.]
- 1926-1977 (3, 85, 98)
- Spiranthes cernua (L.) L.C. Rich. [also reported as: Ibidium cernuum (L.) House.]
- 1933 (127) ND
- Possibly,Spiranthes romanzoffiana Cham. [reported as: Gyrostachys stricta ]
- Ladino clover 1986 (4)
- Trifolium repens L.
- Lad-savour 1900-1929 (157, 158)
- Artemisia abrotanum L.
- Lad's-love [Lad's love] 1892-1923 (5, 73, 92, 156) New England, for aphrodisiac qualitites or use in love divinations
- Artemisia abrotanum L.
- Lady brake 1929 (157)
- Osmunda regalis L.
- Lady fern [Lady-fern, Ladyfern]
- 1932-Present (1, 4, 50)
- Athyrium Roth
- 1895-1986 (2, 3, 4, 40, 46, 72, 97, 109, 131, 138, 155, 157)
- Athyrium filix-femina (L.) Roth [also reported as: Asplenium filix-foemina Bernh., Athyrium filix-foemina (L.) Roth, Athyrium filixfemina]
- Lady fingers [Ladyfingers] 1903-1913 (5, 69)
- Digitalis pupurea L.
- Lady grass 1913 (5) variegated variety
- Phalaris arundinacea L.
- Lady-by-the-gate [Lady by the gate] 1896-1923? (5, 64, 76, 156, 157, 158) obsolete by 1923
- Saponaria officinalis L.
- Lady-by-the-lake 1923 (156)
- Collinsia verna Nutt.
- Lady-in-a-chaise [Lady in a chaise] 1891 (79) NH
- Arisaema triphyllum (L.) Schott [reported as: Arisaema triphyllum (L.) Torr.]
- Lady-never-fade 1900-1923 (5, 156, 158)
- Anaphalis margaritacea (L.) Benth. & Hook
- Lady's sour-grass [Ladies' sour grass, Lady sour grass] 1893-1913 (5, 74) NJ
- Oxalis stricta L. [also reported as: Oxalis corniculata var. stricta Savar., Xanthoxalis stricta (L.) Small]
- Lady's wood sorrel 1840 (19)
- Oxalis corniculata L.
- Lady's-bedstraw [Ladies bedstraw, Lady's bedstraw, Ladies' bedstraw] from legend that Mother of Jesus rested on hay containing one of the species
- 1949 (109)
- Galium L.
- 1917 (57)
- Galium aparine L.
- 1876-1923 (5, 92, 156)
- Galium verum L.
- Lady's-bouquet [Lady's bouquet 1919 (37)
- Galium triflorum Michx.
- Lady's-bower [Ladies' bower] 1898 (49)
- Clematis virginiana L.
- Lady's-cleavers [Ladies' cleavers] 1900 (158)
- Galium verum L.
- Lady's-comb [Lady's comb] 1913-1923 (5, 156)
- Scandix pecten-veneris L.
- Lady's-delight [Lady's delight] 1892-1913 (5, 73, 158)
- Viola tricolor L.
- Lady's-eardrop [Lady's ear drop, Lady's ear-drops, Ladies'-eardrop] 1892-1923 (73, 156, 157, 158) OH
- Impatiens capensis Meerb. [also reported as: Impatiens biflora Walt., Impatiens fulva Nutt.]
- Lady's-fingers [Ladies' finger, Ladies'-fingers] 1913-1923 (5, 156)
- Lotus corniculatus L.
- Lady's-foxglove [Lady's foxglove] 1900-1904 (69, 158)
- Verbascum thapsus L.
- Lady's-glove [Lady glove, Lady's glove, Ladies' glove]
- 1876-1913 (5, 69, 92)
- Digitalis pupurea L.
- 1900 (158)
- Lotus corniculatus L.
- Lady's-hair [Lady's hair] 1900-1913 (5, 158)
- Adiantum capillus-veneris L.
- Lady's-pocket [Lady's pocket, Ladies'-pocket] 1892-1929 (73, 157, 158) OH
- Impatiens capensis Meerb. [also reported as: Impatiens biflora Walt., Impatiens fulva Nutt.]
- Lady's-purse [Lady's purse] 1900-1929 (5, 156, 157, 158)
- Capsella bursa-pastoris (L.) Medik. [also reported as: Bursa bursa-pastoris (L.) Britton]
- Lady's-rouge [Ladies' rouge] 1828 (7)
- Carthamus tinctorius L.
- Lady's-shoes-and-stockings 1900 (158)
- Lotus corniculatus L.
- Lady's-slipper [Lady's-slipper, Lady's slipper, Ladies' slipper, Lady-slipper, Ladyslipper]
- 1814-Present (1, 50, 57, 92, 93, 109, 127, 138, 155, 156, 158, 167) Meriwether Lewis
- Cypripedium L.
- 1886-1911 (55, 64, 102)
- Cypripedium parviflorum Salisb.
- 1908-1928 (40, 55, 64)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill]
- 1892-1923 (5, 73, 156, 158) misapplied
- Lotus corniculatus L. [also reported as: Impatiens biflora Walt.]
- 1898 (77) MA
- Linaria vulgaris P. Mill. [reported as: Linaria vulgaris Hill]
- Lady's-smock [Ladies' smock] 1818-1828 (7, 10)
- Cardamine L.
- Lady's-sorrel [Lady's sorrel, Ladies' sorrel]
- 1895-1923 (2, 5, 156)
- Oxalis corniculata L.[also reported as: Xanthoxalis corniculata (L.) Small]
- 1892-1923 (5, 73, 156, 158)
- Oxalis stricta L. [also reported as: Xanthoxalis stricta (L.) Small]
- Lady's-thimble [Lady's thimble, Lady's thimbles, Lady thimble]
- 1900 (158)
- Campanula rotundifolia L.
- 1904-1923 (5, 69, 156)
- Digitalis pupurea L.
- Lady's-thumb [Lady's thumb, Ladies' thumb]
- 1930-1932 (1, 106)
- Polygonum L. [also reported as: Persicaria (C. Bauhin) P. Mill.]
- 1840-1937 (3, 4, 5, 19, 45, 62, 72, 80, 82, 92, 93, 97, 106, 114, 122, 124, 125, 131, 145, 156)
- Polygonum persicaria L. [also reported as: Persicaria persicaria (L.) Small.]
- Lady's-tobacco [Ladies' tobacco] 1896 (76) Madison WI
- Gnaphalium L.
- Laiteron (French) 1900 (158)
- Sonchus oleraceus L.
- Laitue du Canada (French) 1892 (6)
- Lactuca canadensis L.
- Lake bur-reed 1840 (19)
- Sparganium americanum Nutt.
- Lake gooseberry 1895 (2)
- Ribes lacustre (Pers.) Poir.
- Lake knotweed 1840 (19)
- Polygonum amphibium L. var. emersum Michx. [reported as: Polygonum coccineum Muhl.]
- Lake rush 1923 (156)
- Schoenoplectus tabernaemontani (K.C. Gmel.) Palla [reported as: Scirpus validus Vahl]
- Lake sedge 1903 (66)
- Carex lacustris Willd. [reported as: Carex lucustris]
- Lake-bank sedge [Lake bank sedge] 1913 (5)
- Carex lacustris Willd.
- Lakeweed [Lake weed, Lake-weed] 1876-1929 (92, 157, 158)
- Polygonum hydropiper L.
- LaMance iris [Lamance iris] 1923-1977 (3, 138, 155)
- Iris brevicaulis Raf. [also reported as: Iris foliosa Mackenzie & Bush]
- Lamb mint [Lamb's-mint, Lamb's mint]
- 1913-1929 (5, 156, 157)
- Mentha ×piperita L. [aquatica × spicata] [also reported as: Mentha piperita L.]
- 1900-1923 (5, 156, 158)
- Mentha spicata L.
- Lambert's crazyweed [Lambert crazyweed] 1942 (155)
- Oxytropis lambertii Pursh [reported as: Oxytropis lamberti Pursh]
- Lamb's quarters [Lambsquarter] 1828-1986 (1, 4, 7, 93, 146)
- Chenopodium L. [also reported as: Chenopodium (Tourn.) L.]
- Lamb's-foot [Lamb's foot] 1900-1929 (5, 156, 157, 158)
- Plantago major L.
- Lamb's-lettuce [Lamb's lettuce, Lamb lettuce]
- 1900-1986 (1, 4, 158)
- Valerianella P. Mill.
- 1828-1923 (5, 7, 92, 156)
- Valerianella radiata (L.) Dufr. [also reported as: Fedia radiata Michx.]
- Lamb's-noses [Lamb's noses] 1923 (156)
- Dodecatheon meadia L.
- Lamb's-quarters [Lamb's-quarter, Lamb's quarters, Lambsquarters, Lambs' quarter, Lamb's-quarters, Lambsquarter, Lamb'squarters]
- 1900-1923 (5, 156, 158)
- Atriplex subspicata (Nutt.) Rydb. [also reported as: Atriplex patula L.]
- 1806-Present (3, 4, 5, 35, 37, 45, 50, 62, 72, 80, 85, 92, 93, 95, 97, 103, 107, 121, 122, 125, 131, 145, 150, 156, 157, 158) Meriwether Lewis
- Chenopodium album L.
- Present (50)
- Chenopodium album L. var. album
- 1893 (21)
- Chenopodium watsonii A. Nels. [reported as: Chenopodium dacotacum, Chenopodium dacoticum Standl.]
- 1900 (158) misapplied
- Trillium cernuum L.
- Lambsquarters goosefoot 1942 (155)
- Chenopodium album L.
- Lamb's-tails [Lamb's-tails] 1900-1923 (156, 158) England catkins
- Salix discolor Muhl.
- Lamb's-tongue [Lamb's tongue] 1900-1923? (5, 156, 158) obsolete by 1923
- Mentha arvensis L.
- Lambs-tongue groundsel [Lambstongue groundsel] 1942 (155)
- Senecio integerrimus Nutt.
- Lambs-tongue ragwort [Lambstongue ragwort]
- Present (50)
- Senecio integerrimus Nutt.
- Present (50)
- Senecio integerrimus Nutt. var. integerrimus
- Lamb-sucklings [Lamb's sucklings, Lamb sucklings] 1900-1923? (5, 156, 157, 158) obsolete by 1923
- Trifolium repens L.
- Lammint
- 1929 (157)
- Mentha ×piperita L. [aquatica × spicata] [reported as: Mentha piperita L.]
- 1900 (158)
- Mentha spicata L.
- Lamp rush Present (50)
- Juncus effusus L. var. solutus Fern. & Wieg.
- Lampourde (French) 1900 (158)
- Xanthium strumarium L.
- Lancaster cyperus 1913 (5)
- Cyperus lancastriensis Porter ex Gray
- Lance coreopsis 1923-1942 (138, 155)
- Coreopsis lanceolata L.
- Lance pickerel-weed [Lance pickerelweed] 1942 (155)
- Pontederia cordata L. [reported as: Pontederia cordata L. var. lancifolia (Muhl. ex Ell.) Torr.]
- Lance self-heal [Lance selfheal] Present (50)
- Prunella vulgaris L. ssp. lanceolata (W. Bart.) Hultén
- Lance-leaf balsam tree [Lance-leaved balsam tree] 1785 (8)
- Populus balsamifera L. ssp. balsamifera [reported as: Populus balsamifera lanceolata]
- Lance-leaf blanket-flower [Lanceleaf blanketflower] Present (50)
- Gaillardia aestivalis (Walt.) Rock
- Lance-leaf blazing star [Lanceleaf blazing star] Present (50)
- Liatris lancifolia (Greene) Kittell
- Lance-leaf bluebells [Lanceleaf bluebells 1942 (155)
- Mertensia lanceolata (Pursh) DC.
- Lance-leaf buckthorn [Lanceleaf buckthorn, Lance-leaved buckthorn]
- 1907-Present (5, 50, 72, 82, 155)
- Rhamnus lanceolata Pursh
- 1986-Present (4, 50)
- Rhamnus lanceolata Pursh ssp. glabrata (Gleason) Kartesz & Gandhi
- Lance-leaf coreopsis [Lanceleaf coreopsis] 1937 (122) TX
- Coreopsis lanceolata L.
- Lance-leaf cottonwood [Lanceleaf cottonwood, Lance-leaved cottonwood] 1932-Present (4, 50, 85)
- Populus ×acuminata Rydb.
[angustifolia × deltoides] [also reported as: Populus acuminata Rydb.]
- Lance-leaf figwort [Lanceleaf figwort] 1942-Present (50, 155)
- Scrophularia lanceolata Pursh
- Lance-leaf fogfruit [Lanceleaf fogfruit] Present (50)
- Phyla lanceolata (Michx.) Greene
- Lance-leaved gaillardia 1937 (97) OK
- Gaillardia aestivalis (Walt.) Rock [reported as: Gaillardia lanceolata Michx.]
- Lance-leaf garlic [Lance-leaved garlic] 1923 (156)
- Allium tricoccum Ait. Allium tricoccum Ait.
- Lance-leaf goldenweed [Lanceleaf goldenweed] 1942-Present (50, 155)
- Pyrrocoma lanceolata (Hook.) Greene var. lanceolata [also reported as: Aplopappus lanceolatus (Haplopappus lanceolatus (Hook.) Torr. & Gray)]
- Lance-leaf grape-fern [Lance-leaved grape-fern] 1913-Present (5, 50)
- Botrychium lanceolatum (S.G. Gmel.) Angs.
- Lance-leaf gaillardia [Lance-leaved gaillardia]1937 (97) OK
- Gaillardia aestivalis (Walt.) Rock [reported as: Gaillardia lanceolata Michx.]
- Lance-leaf ground-cherry [Lanceleaf ground cherry, Lance-leaved ground cherry] 1913-1937 (5, 122)
- Physalis angulata L. [also reported as: Physalis pendula Rydb.]
- Lance-leaf loosestrife [Lanceleaf loosestrife, Lance-leaved loosestrife]
- 1937 (122) TX
- Lysimachia hybrida Michx. [reported as: Steironema hybridum (Michx.) Ref.]
- 1907-1937 (5, 50, 72, 82, 85, 97)
- Lysimachia lanceolata Walt. [also reported as: Steironema lanceolatum (Walt.) Gray]
- Lance-leaf lungwort [Lance-leaved lungwort] 1899-1913 (5, 131)
- Mertensia lanceolata (Pursh) DC.
- Lance-leaf plantain [Lance-leaved plantain] 1896-1913 (5, 45)
- Plantago lanceolata L.
- Lance-leaf psoralea [Lance-leaved psoralea] 1899-1937 (5, 93, 97, 131)
- Psoralidium lanceolatum (Pursh) Rydb. [also reported as: Psoralea lanceolata Pursh]
- Lance-leaf sage [Lanceleaf sage, Lance-leaved sage] 1899-Present (3, 4, 5, 50, 72, 93, 97, 131, 155)
- Salvia reflexa Hornem. [also reported as: Salvia lanceifolia Poir., Salvia lancaefolia Poir., Salvia lanceolata Willd.,]
- Lance-leaf salvia [Lance-leaved salvia] 1913 (80) IA
- Salvia reflexa Hornem. [reported as: Salvia lanceaefolia Poir.]
- Lance-leaf thistle [Lance leaved thistle, Lance-leaved thistle] 1901 (56) IA
- Cirsium vulgare (Savi) Ten. [reported as: Cnicus lanceolatus L.]
- Lance-leaf tickseed [Lanceleaf tickseed, Lance-leaved tickseed] 1913-Present (5, 50)
- Coreopsis lanceolata L.
- Lance-leaf violet [Lanceleaf violet, Lance-leaved violet] 1895-1942 (2, 5, 72, 93, 122, 138, 155, 156)
- Viola lanceolata L.
- Lanceolate draba 1942 (155)
- Draba breweri S. Wats. var. cana (Rydb.) Rollins [reported as: Draba lanceolata Royle]
- Land caltrop [Land caltrops] 1900-1923 (5, 107, 156, 158)
- Tribulus terrestris L.
- Landcress [Land-cress] 1929 (157)
- Barbarea vulgaris Aiton f. [reported as: Barbarea barbarea (L.) MacM.]
- Landlauch 1828 (7)
- Allium L. [reported as: Allium (Tourn.) L.]
- Lang-de-beef 1923 (156)
- Borago officinalis L.
- Langsdorff's yellow monkey-flower [Langsdorff's yellow monkey flower] 1913 (5)
- Mimulus guttatus DC. [reported as: Mimulus langsdorfii Donn ex Greene]
- Langue de chien (French) 1900 (158)
- Cynoglossum officinale L.
- Languid lady 1932 (1)
- Mertensia Roth
- Lank galingale 1923 (156)
- Cyperus strigosus L.
- Lantern plant 1937 (124) TX
- Physalis longifolia Nutt. var. subglabrata (Mackenzie & Bush) Cronq. [reported as: Physalis macrophysa Rydb.]
- Lantern-leaves 1900-1923 (156, 158)
- Ranunculus repens L.
- Laouzerdo (French, South of France) 1886 (110) Possibly, morphed into luzerne, hence source of common name of Lucerne
- Medicago sativa L.
- Lapathum 1892 (6)
- Rumex obtusifolius L.
- Lapham's phlox Present (50)
- Phlox divaricata L. ssp. laphamii (Wood) Wherry
- Lap-love 1900-1923? (156, 157, 158) obsolete by 1923
- Convolvulus arvensis L. [also reported as: Convolvulus incanus Vahl.]
- Laportea Present (50)
- Laportea Gaud.
- Lappa 1892-1917 (6, 52, 55, 57, 64)
- Arctium lappa L.
- Larea-bell [Larea bell] 1923-1923 (5, 156)
- Helianthus annuus L.
- Laredo mahonia 1942 (155)
- Mahonia trifoliolata (Moric.) Fedde
- Large agrimony 1882 (48) Kansas
- Agrimonia parviflora Aiton
- Large alfalfa dodder 1977-1986 (3, 4)
- Cuscuta indecora Choisy
- Large beardtongue [Large beard-tongue] 193-Present (3, 4, 50, 127)
- Penstemon grandiflorus Nutt.
- Large bellwort 1923-1977 (3, 127, 156)
- Uvularia grandiflora Smith.
- Large bindweed [Large bind-weed] 1911-1933 (95, 127)
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [also reported as: Convolvulus americanus (Sims) Greene, Convolvulus sepium L.]
- Large blue flag [Large blue-flag] 1923-1936 (93, 156)
- Iris versicolor L.
- Large blue iris 1907 (72) IA
- Iris versicolor L.
- Large blue lettuce 1937 (122) TX
- Lactuca tatarica (L.) C.A. Mey. var. pulchella (Pursh) Breitung [reported as: Lactuca pulchella (Pursh) DC.]
- Large blue lobelia 1923 (138)
- Lobelia siphilitica L.
- Large button snakeroot 1930-1937 (82, 122) IA TX
- Liatris aspera Michx. [also reported as: Liatris scariosa Willd.]
- Large buttonwood [Large button wood 1785 (8)
- Platanus occidentalis L.
- Large coralroot [Large coral root, Large coral-root] 1900-1937 (5, 93, 122, 156, 157)
- Corallorrhiza maculata (Raf.) Raf.
- Large crabgrass [Large crab grass, Large crab-grass] 1852-1936 (5, 72, 99, 131, 143, 163)
- Digitaria sanguinalis (L.) Scop. [also reported as: Syntherisma sanguinalis (L.) Dulac]
- Large crowfoot grass 1896 (151) NM
- Echinochloa crus-galli (L.) Beauv. [reported as: Panicum crus-galli L.]
- Large duckweed 1936 (93) Neb
- Spirodela Scheilen
- Large fennel 1900-1929 (157, 158)
- Foeniculum vulgare P. Mill. [also reported as: Foeniculum foeniculum (L.) Karst.]
- Large houstonia 1913-1937 (5, 97)
- Houstonia purpurea L.
- Large Indian breadroot Present (50)
- Pediomelum esculentum (Pursh) Rydb.
- Large lophotocarpus 1936-1937 (93, 97)
- Sagittaria calycina Engelm. var. calycina [also reported as: Lophotocarpus calycinus (Engelm.) J.G. Smith]
- Large mouse-ear chickweed 1907-1936 (72, 93, 156)
- Cerastium fontanum Baumg. ssp. vulgare (Hartman) Greuter & Burdet [also reported as: Cerastium vulgatum L.]
- Large naias 1913-1937 (5, 97)
- Najas marina L.
- Large oilnut [Large oil nut] 1649 (46)
- Juglans nigra L.
- Large pepper-grass [Large peppergrass] 1913 (80) IA
- Lepidium virginicum L.
- Large pinweed [Large pin-weed] 1913 (5)
- Lechea mucronata Raf. [reported as: Lechea villosa Ell.]
- Large purple agalinis 1913-1936 (5, 93) Neb
- Agalinis purpurea (L.) Pennell [also reported as: Agalinis purpurea (L.) Britton]
- Large purple aristida 1901 (56) IA
- Aristida purpurea Nutt. var. longiseta (Steud.) Vasey [reported as: Aristida longiseta Steud. var. robusta Merr.]
- Large purple aster 1923 (156)
- Symphyotrichum patens (Aiton) Nesom var. patens [reported as: Aster patens Aiton]
- Large purple gerardia 1907-1937 (72, 122, 124)
- Agalinis purpurea (L.) Pennell [also reported as: Gerardia purpurea L.]
- Large purple-poppy [Large purple poppy] 1937 (97) OK
- Callirhoe papaver (Cav.) Gray
- Large pussy willow 1977 (3)
- Salix discolor Muhl.
- Large rampion 1900-1929 (5, 156, 157, 158)
- Oenothera biennis L. [also reported as: Onagra biennis (L.) Scop.]
- Large round-leaf orchis [Large round-leaved orchis] 1913 (5)
- Platanthera orbiculata (Pursh) Lindl. [reported as: Lysias orbiculata (Pursh) Rydb.]
- Large Russian vetch 1919 (107)
- Vicia villosa Roth
- Large smooth beardtongue [Large smooth beard-tongue] 1913-1936 (5, 93)
- Penstemon glaber Pursh
- Large snapdragon 1949 (109)
- Antirrhinum majus L.
- Large spikenard 1828 (7)
- Aralia racemosa L.
- Large spotted spurge [Large spotted -purge] 1900-1936 (5, 62, 93, 156, 158)
- Chamaesyce nutans (Lag.) Small [also reported as: Chamaesyce preslii (Guss.) Arthur, Euphorbia nutans Lag., Euphorbia preslii Guss.]
- Large St. Johns-wort [Large St. Johnswort] Present (50)
- Hypericum majus (Gray) Britton
- Large tooth-leaf primrose [Large tooth-leaved primrose] 1937 (97) OK
- Calylophus serrulatus (Nutt.) Raven [reported as: Meriolix intermedia Rydb.]
- Large two-leaved orchis 1913-1923 (5, 156)
- Platanthera orbiculata (Pursh) Lindl. [also reported as: Habenaria orbiculata Torr., Lysias orbiculata (Pursh) Rydb.]
- Large water grass [Large water-grass] 1901-1913 (5, 94)
- Paspalum dilatatum Poir.
- Large water-starwort 1938 (120) OK
- Callitriche heterophylla Pursh
- Large white indigo 1937 (97) OK
- Baptisia alba (L.) Vent. var. macrophylla (Larisey) Isely [reported as: Baptisia leucantha Torr. & Gray]
- Large white waterlily [Large white water lily] 1892 (6)
- Nymphaea odorata Aiton
- Large white wild indigo 1936 (93) Neb
- Baptisia alba (L.) Vent. var. macrophylla (Larisey) Isely [reported as: Baptisia leucantha Torr. & Gray]
- Large white-grain mountain-rice [Large white-grained mountain-rice] 1885 (90) ME
- Oryzopsis asperifolia Michx.
- Large yellow flax 1937 (124) TX
- Linum berlandieri Hook.
- Large yellow lady's-slipper [Large yellow lady's slipper, Large yellow ladies' slipper] 1907-1908 (64, 72)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill]
- Large yellow loosestrife Present (50)
- Lysimachia punctata L.
- Large yellow pond-lily [Large yellow pond lily] 1895-1913 (5, 37, 131, 158)
- Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi [also reported as: Nymphaea advena Soland.]
- Large yellow sweet plumb 1785 (8)
- Prunus americana Marsh.
- Large yellow-flower goldenrod [Large yellow-flowered goldenrod] 1913 (80) IA
- Oligoneuron rigidum (L.) Small var. rigidum [reported as: Solidago rigida L.]
- Large-bladder ground-cherry [Large bladder ground cherry, Large-bladder ground cherry] 1913?-1937 (5, 122, 124)
- Physalis longifolia Nutt. var. subglabrata (Mackenzie & Bush) Cronq. [also reported as: Physalis macrophysa Rydb.]
- Large-bract aster [Large-bracted aster] 1913-1936 (5, 93) Neb
- Symphyotrichum foliaceum (DC.) Nesom var. canbyi (Gray) Nesom [also reported as: Aster phyllodes Rydb.]
- Large-bract corydalis [Large-bracted corydalis] 1986 (4)
- Corydalis curvisiliqua Engelm. ssp. grandibracteata (Fedde) G.B. Ownbey
- Large-bract Indian breadroot [Largebract Indian breadroot] Present (50)
- Pediomelum cuspidatum (Pursh) Rydb.
- Large-bract plantain [Large-bracted plantain, Largebracted plantain]
- 1899-Present (5, 50, 72, 93, 97, 131, 156)
- Plantago aristata Michx.
- 1937 (97) OK
- Plantago patagonica Jacq. [reported as: Plantago spinulosa Dcne.]
- Large-bract psoralea [Large-bracted psoralea] 1899-1937 (5, 93, 97, 131)
- Pediomelum cuspidatum (Pursh) Rydb. [also reported as: Psoralea cuspidata Pursh]
- Large-bract tick-trefoil [Largebract ticktrefoil, Large-bracted tick trefoil, Large-bracted tick-trefoil]
- 1913-Present (5, 50, 97)
- Desmodium cuspidatum (Muhl. ex Willd.) DC. ex Loud. [also reported as: Meibomia bracteosa (Michx.) Kuntze]
- Present (50)
- Desmodium cuspidatum (Muhl. ex Willd.) DC. ex Loud. var. longifolium (Torr. & Gray) Schub.
- Large-bract vervain [Large-bracted vervain] 1899-1937 (5, 72, 93, 97, 131, 156)
- Verbena bracteata Lag. & Rodr. [also reported as: Verbena bracteosa Michx.]
- Large-bract wild indigo [Large-bracted wild indigo] 1907-1937 (5, 72, 93, 97)
- Baptisia bracteata Muhl. ex Ell.
- Large-flower agoseris [Large-flowered agoseris]
- 1913 (5)
- Agoseris glauca (Pursh) Raf. [reported as: Agoseris glauca (Pursh) D. Dietr.]
- 1899 (131) SD
- Agoseris glauca (Pursh) Raf. var. glauca [reported as: Agoseris glauca (Pursh) Greene (Troximon glaucum Pursh)]
- Large-flower baby-blue-eyes [Largeflower baby blue eyes] Present (50)
- Nemophila phacelioides Nutt.
- Large-flower beardtongue [Large-flowered beard-tongue, Large flowered beard tongue] 1899-1937 (5, 72, 93, 97, 131)
- Penstemon grandiflorus Nutt.
- Large-flower bellwort [Largeflower bellwort, Large-flowerd bellwort] 1907-Present (5, 50, 72, 97)
- Uvularia grandiflora Smith.
- Large-flower blue lettuce [Large-flowered blue lettuce] 1899-1937 (5, 72, 93, 97, 131)
- Lactuca tatarica (L.) C.A. Mey. var. pulchella (Pursh) Breitung [also reported as: Lactuca pulchella (Pursh) DC., Lactuca pulcella (Pursh) DC.]
- Large-flower Carolina rose [Largeflower carolina rose] 1942 (155)
- Rosa carolina L. var. carolina [reported as: Rosa carolina L. var. grandiflora (Baker) Rehd.]
- Large-flower clammy weed [Large-flowered clammy weed, Large-flowered clammy-weed] 1907-1986 (4, 5, 72, 97)
- Polanisia dodecandra (L.) DC. ssp. trachysperma (Torr. & Gray) Iltis [also reported as: Polanisia trachysperma Torr. & Gray]
- Large-flower coneflower [Largeflower coneflower, Large-flowered cone-flower] 1913-1937 (5, 97, 122) OK TX
- Rudbeckia grandiflora (D. Don) J.F. Gmel. ex DC.
- Large-flower everlasting [Large-flowered everlasting, Large flowered everlasting] 1900-1937 (5, 72, 97, 156, 158)
- Anaphalis margaritacea (L.) Benth. & Hook
- Large-flower fameflower [Largeflower fameflower] Present (50)
- Talinum calycinum Engelm.
- Large-flower goldenrod [Large-flowered goldenrod] 1913 (80) IA
- Oligoneuron rigidum (L.) Small var. rigidum [reported as: Solidago rigida L.]
- Large-flower gray hawk's-beard [Large-flowered gray hawksbeard, Largeflower hawksbeard] 1913-Present (50, 5)
- Crepis occidentalis Nutt.
- Large-flower leaf-cup [Large-flowered leaf-cup, Large-flowering leaf-cup] 1900-1937 (5, 97, 158)
- Smallanthus uvedalius (L.) Mackenzie ex Small [also reported as: Polymnia uvedalia L.]
- Large-flower opuntia [Large-flowered opuntia] 1937 (97) OK
- Opuntia macrorhiza Engelm. var. macrorhiza [reported as: Opuntia grandiflora Engelm.]
- Large-flower penstemon [Large flower penstemon, Large-flowered penstemon] 1937 (122, 124) TX
- Penstemon grandiflorus Nutt.
- Large-flower sensitive pea [Large-flowered sensitive pea]
- 1913 (5)
- Chamaecrista fasciculata (Michx.) Greene
- 1878-1913 (5, 86)
- Chamaecrista fasciculata (Michx.) Greene var. fasciculata [also reported as: Cassia chamaecrista L.]
- Large-flower skeleton-plant [Largeflower skeletonplant] Present (50)
- Lygodesmia grandiflora (Nutt.) Torr. & Gray
- Large-flower spurge [Large flowered spurge, Large-flowered spurge, Large flowering spurge, Large-flowering spurge] 1876-1922 (6, 49, 52, 53, 57, 92, 156, 157, 158)
- Euphorbia corollata L.
- Large-flower stickseed [Large-flowered stickseed] 1899-1986 (4, 5, 93, 131)
- Hackelia floribunda (Lehm.) I.M. Johnston [also reported as: Lappula floribunda (Lehm.) Greene]
- Large-flower sticktight [Large-flowered sticktight] 1932 (85) SD
- Hackelia floribunda (Lehm.) I.M. Johnston [reported as: Lappula floribunda (Lehm.) Greene]
- Large-flower stork's-bill [Large flowered stork's bill] 1937 (122, 124) TX
- Erodium texanum Gray
- Large-flower talinum [Large-flowered talinum] 1913-1937 (5, 93, 97)
- Talinum calycinum Engelm.
- Large-flower thoroughwort [Largeflower thoroughwort, Large-flowered thoroughwort] 1913-1937 (5, 122)
- Brickellia grandiflora (Hook.) Nutt. [also reported as: Coleosanthus grandiflorus (Hook.) Kuntze]
- Large-flower tickclover [Large-flowered tickclover] 1942-1986 (3, 4, 155)
- Desmodium glutinosum (Muhl. ex Willd.) Wood [also reported as: Desmodium acuminatum DC.]
- Large-flower tickseed [Largeflower tickseed, Large-flowered tickseed]] 1913-Present (5, 50, 97)
- Coreopsis grandiflora Hogg ex Sweet
- Large-flower Townsend daisy [Largeflower Townsend daisy] Present (50)
- Townsendia grandiflora Nutt.
- Large-flower townsendia [Large-flowered townsendia] 1913-1937 (5, 97)
- Townsendia grandiflora Nutt.
- Large-flower verbena Large-flowered verbena 1900-1937 (5, 72, 97, 158) IA OK
- Glandularia canadensis (L.) Nutt. [also reported as: Verbena canadensis (L.) Britton]
- Large-flower yellow false foxglove [Largeflower yellow false foxglove] Present (50)
- Aureolaria grandiflora (Benth.) Pennell var. serrata (Torr. ex Benth.) Pennell
- Large-flower yellow flax [Large flower yellow flax, Large-flowered yellow flax]
- 1899-1937 (122, 72, 131)
- Linum rigidum Pursh
- 1913-1937 (5, 97)
- Linum rigidum Pursh var. rigidum [also reported as: Cathartolinum rigidum (Pursh) Small]
- Large-fruit evening-primrose [Large-fruited evening primrose] 1878 (86)
- Oenothera macrocarpa Nutt. ssp. macrocarpa [reported as: Oenothera missouriensis Sims]
- Large-fruit panicum [Large-fruited panicum] 1901 (56) IA
- Dichanthelium oligosanthes (J.A. Schultes) Gould var. scribnerianum (Nash) Gould[reported as: Panicum macrocarpon Le Conte ex Torr.]
- Large-fruit thorn [Large-fruited thorn] 1907-1913 (5, 72)
- Crataegus punctata Jacq.
- Large-leaf anglepod [Largeleaf angle pod, Large-leaved angle-pod] 1913-1937 (5, 97, 122, 156)
- Matelea gonocarpos (Walt.) Shinners
[also reported as: Vincetoxicum gonocarpos Walt.]
- Large-leaf avens [Large-leaved avens]
- 1899-Present (5, 50, 72, 131, 155)
- Geum macrophyllum Willd.
- Present (50)
- Geum macrophyllum Willd. var. perincisum (Rydb.) Raup
- Large-leaf goldenrod [Largeleaf goldenrod, Large-leaved goldenrod] 1913-1937 (5, 122)
- Solidago ulmifolia Muhl. ex Willd. [also reported as: Solidago macrophylla Pursh, Solidago microphylla Engelm.]
- Large-leaf pondweed [Largeleaf pondweed, Large-leaved pondweed] 1899-Present (5, 50, 93, 131, 155)
- Potamogeton amplifolius Tuckern.
- Large-leaf Virginia mulberry tree [Large-leaved Virginian mulberry tree] 1785 (8)
- Morus rubra L.
- Large-leaf white violet [Large-leaved white violet] 1913 (5)
- Viola macloskeyi Lloyd [reported as: Viola incognita Brainerd]
- Large-leaf wild indigo [Largeleaf wild indigo] Present (50)
- Baptisia alba (L.) Vent. var. macrophylla (Larisey) Isely
- Large-panicle vilfa [Large-panicled vilfa] 1903 (66)
- Sporobolus cryptandrus (Torr.) Gray
- Large-pod pinweed [Largepod pinweed, Large-podded pin-weed] 1913-Present (5, 50)
- Lechea intermedia Leggett
- Larger American abele 1895 (2)
- Populus grandidentata Michx.
- Larger blue flag 1874-1922 (2, 5, 6, 53, 157)
- Iris versicolor L.
- Larger Canadian St. John's-wort, Larger Canadian St. John's wort] 1913-1936 (5, 93)
- Hypericum majus (Gray) Britton
- Larger coralroot [Larger coral-root] 1929 (157)
- Corallorrhiza maculata (Raf.) Raf.
- Larger daisy fleabane 1907-1923 (72, 156) IA
- Erigeron annuus (L.) Pers.
- Larger duckweed
- 1932 (1)
- Spirodela Scheilen
- 1923 (156)
- Spirodela polyrhiza (L.) Schleid.
- Larger ground-plum [Larger ground plum] 1899-1937 (5, 93, 97, 131)
- Astragalus crassicarpus Nutt. var. berlandieri Barneby [also reported as: Astragalus mexicanus A. DC., Geoprumnon mexicanum (A. DC.) Rydb.]
- Larger Indian bean 1899 (5, 63, 72, 158)
- Catalpa speciosa (Warder) Warder ex Engelm.
- Larger mouse-ear 1913 (80) IA
- Cerastium fontanum Baumg. ssp. vulgare (Hartman) Greuter & Burdet [reported as: Cerastium vulgatum L.]
- Larger mouse-ear chickweed 1913-1937 (5, 97)
- Cerastium fontanum Baumg. ssp. vulgare (Hartman) Greuter & Burdet [also reported as: Cerastium vulgatum L.]
- Larger pinweed 1895 (2)
- Lechea mucronata Raf. [reported as: Lechea major Michx.]
- Larger sensitive pea [Larger sensitive-pea] 1900 (158)
- Chamaecrista fasciculata (Michx.) Greene var. fasciculata [reported as: Cassia chamaecrista L.]
- Larger short-awn chess [Larger short-awned chess] 1901 (56) IA
- Bromus marginatus Nees ex Steud. [reported as: Bromus marginatus Nees ex Steud. var. latior Shear]
- Larger Solomon's seal 1895 (2)
- Polygonatum biflorum (Walt.) Ell. var. commutatum (J.A. & J.H. Schultes) Morong [reported as: Polygonatum giganteum Dietr.]
- Larger straw sedge 1913 (5)
- Carex normalis Mackenzie
- Larger water-starwort [Larger water starwort, Larger waterstarwort] 1913-1942 (5, 155)
- Callitriche heterophylla Pursh
- Larger wintergreen 1900 (158)
- Pyrola americana Sweet [reported as: Pyrola rotundifolia L.]
- Large-seed forget-me-not [Large-seeded forget-me-not] 1899-Present (50, 131)
- Myosotis macrosperma Engelm.
- Large-spotted St. John's-wort [Large-spotted St. John's wort] 1913-1937 (5, 97)
- Hypericum punctatum Lam. [also reported as: Hypericum pseudomaculatum Bush]
- Largest red oak 1785 (8)
- Quercus rubra L. var. rubra [reported as: Quercus rubra maxima , Quercus rubra var. maxima Marshall, Quercus maxima (Marsh.) Ashe]
- Large-stipule Indian physic [Large stipuled Indian physic] 1895 (2)
- Porteranthus stipulatus (Muhl. ex Willd.) Britt. [reported as: Gillenia stipulacea Nutt.]
- Large-tooth aspen [Largetooth aspen, Large-toothed aspen] 1900-1923 (5, 72, 109, 138, 156, 158) IA
- Populus grandidentata Michx.
- Laritsits (Pawnee) 1919 (37)
- Shepherdia argentea (Pursh) Nutt. [reported as: Lepargyraea argentea (Nutt.) Greene]
- Larkspur [Lark-spur]
- 1814-Present (1, 2, 4, 7, 10, 13, 15, 50, 63, 82, 93, 148, 138, 155, 158, 167)
- Delphinium L. [also reported as: Delphinium (Tourn.) L., Delphinium Tourn., Delphidium Raf.]
- 1933 (126) ND
- Delphinium bicolor Nutt.
- 1932 (85) SD
- Delphinium nuttallianum Pritz ex. Walp. [reported as: Delphinium nelsoni Greene, Delphinium nelsonii Greene]
- 1900 (158) misapplied
- Linaria vulgaris P. Mill. [reported as: Linaria linaria (L.) Karst.]
- Larkspur violet 1923-1986 (4, 5, 93, 138, 156)
- Viola pedatifida G. Don
- Larrabell 1900-1929 (157, 158)
- Helianthus annuus L.
- Lasater's pride 1937 (124) TX
- Abronia fragrans Nutt. ex Hook.
- Last-rose-of-summer 1923 (156)
- Symphyotrichum novae-angliae (L.) Nesom [reported as: Aster novae-angliae L.]
- Latarka (India) 1886 (110)
- Allium cepa L.
- Late Carolina poplar 1942 (155)
- Populus ×canadensis Moench [deltoides × nigra] [reported as: Populus canadensis Moench var. serotina (T. Hartig) Rehd.]
- Late coralroot [Late coral root, Late coral-root] 1900-1977 (3, 64, 122, 156, 158) TX
- Corallorrhiza odontorhiza (Willd.) Poir. [also reported as: Corallorrhiza odontorhiza (Willd.) Nutt.]
- Late eupatorium 1942-1977 (3, 155)
- Eupatorium serotinum Michx.
- Late fragrant sumac 1942 (155)
- Rhus aromatica Aiton var. serotina (Greene) Rehd.
- Late goldenrod [Late golden-rod]
- 1899-1986 (3, 4, 5, 72, 82, 93, 95, 97, 122, 131)
- Solidago gigantea Aiton
- 1840 (19)
- Solidago petiolaris Aiton
- Late low blueberry 1923 (156)
- Vaccinium pallidum Aiton [reported as: Vaccinium vacillans Kalm.]
- Late purple aster 1907-Present (5, 50, 72, 97)
- Symphyotrichum patens (Aiton) Nesom var. patens [also reported as: Aster patens Aiton, Aster tenuicaulis (Mohr) Burgess]
- Late thoroughwort 1923 (138)
- Eupatorium serotinum Michx.
- Late white aster 1930 (82) IA
- Oligoneuron album (Nutt.) Nesom [reported as: Aster ptarmicoides (Nees) Torr. & Gray]
- Late-flowering goosefoot [Lateflowering goosefoot] Present (50)
- Chenopodium album L. var. striatum (Krasan) Kartesz
- Late-flowering thoroughwort [Late flowering thoroughwort, Lateflowering thoroughwort] 1907-Present (5, 50, 72, 82, 97, 122)
- Eupatorium serotinum Michx.
- Late-fruit sedge [Late-fruited sedge] 1894-1903 (66, 129)
- Carex retrorsa Schwein
- Latherwort 1900-1929 (64, 156, 157, 158)
- Saponaria officinalis L.
- Lathyrus Major latifolius flore purpureo speciosior 1622 (46) Bauhin
- Lathyrus latifolius L.
- Lathyrus peregrinus foliis viciae flore subcaeruleo pallideve purpurascente 1622 (46) C. Bauhin
- Lathyrus palustris L.
- Latuca (Latin) 1886 (110)
- Lactuca sativa L. [reported as: Lactuca scariola L. var. sativa (Moris)]
- Lauch (German) 1900 (158)
- Allium porrum L.
- Laughter-Mover [Laughter Mover] (India) 1892 (6)
- Cannabis sativa L.
- Laurel oak 1827-1936 (5, 20, 19, 33, 82, 93, 113, 156)
- Quercus imbricaria Michx.
- Laurel willow 1923-Present (50, 112, 138, 155)
- Salix pentandra L.
- Laurel-cherry 1942 (155)
- Prunus L.
- Laurel-leaf willow [Laurel-leaved willow] 1910-1986 (3, 4, 85, 109, 135)
- Salix pentandra L.
- Laurestinus 1930 (82) IA
- Viburnum L. [reported as: Viburnum (Tourn.) L.]
- Laurier beujoin (French) 1785 (8)
- Lindera benzoin Blume. [reported as: Laurus benzoin L.]
- Laurier sassafras (French) 1785 (8)
- Sassafras albidum (Nutt.) Nees [reported as: Laurus sassafras L.]
- Lauten (Spanish) 1900 (158)
- Plantago lanceolata L.
- Lavender 1900 (158) misapplied
- Balsamita major Desf. [reported as: Chrysanthemum balsamita L.]
- Lavender hyssop 1926-1986 (3, 4, 98)
- Agastache foeniculum (Pursh) Kuntze
- Lavender violet 1923 (156)
- Viola pedata L.
- Lavender-cotton [Lavender cotton] 1818-1840 (10, 19)
- Matricaria discoidea DC. [also reported as: Santolina suaveolens Pursh]
- Lavender-leaf evening-primrose [Lavenderleaf eveningprimrose] 1942 (155)
- Calylophus lavandulifolius (Torr. & Gray) Raven [reported as: Oenothera lavandulifolia Torr. & Gray]
- Lavender-leaf primrose [Lavender-leaved primrose] 1913-1986 (4, 5, 97)
- Calylophus lavandulifolius (Torr. & Gray) Raven [also reported as: Galpinsia lavendulaefolia (Torr. & Gray) Small]
- Lavender-leaf sundrops [Lavenderleaf sundrops] Present (50)
- Calylophus lavandulifolius (Torr. & Gray) Raven
- Lawn daisy [Lawndaisy] Present (50)
- Bellis perennis L.
- Lawn plant 1930 (106)
- Phyla nodiflora (L.) Greene [reported as: Lippia repens , Lippia nodiflora (L.) Michx.)]
- Laxmann's milkvetch Present (50)
- Astragalus laxmannii Jacq.
- Laylock 1923? (156) obsolete by 1923
- Syringa vulgaris L.
- Lazy-daisy [Lazy daisy]
- 1986 (4)
- Aphanostephus DC.
- 1977 (3)
- Aphanostephus pilosus Buckl.
- 1977 (3)
- Aphanostephus ramosissimus DC.
- 1977 (3)
- Aphanostephus skirrobasis (DC.) Trelease
- Le Blé Noir (French) 1892 (6)
- Fagopyrum esculentum Moench
- Le Blé Sarrasin (French) 1892 (6)
- Fagopyrum esculentum Moench
- Le Conte's paspalum 1913 (5)
- Paspalum floridanum Michx. [reported as: Paspalum difforme Le Conte]
- Le Conte's violet [LeConte violet] 1913-1942 (5, 155)
- Viola affinis Le Conte
- Le Cotonnière (French) 1892 (6)
- Pseudognaphalium obtusifolium (L.) Hilliard & Burtt ssp. obtusifolium [reported as: Gnaphalium polycephalum Michx. (Gnaphalium obtusifolium L.)]
- Le Fraisier (French) 1892-1900 (6, 158)
- Fragaria vesca L.
- Le Frééne Blanc (French) 1892 (6)
- Fraxinus americana L.
- Le Liseron (French) 1892 (6)
- Convolvulus arvensis L.
- Le Tournesol (French) 1892 (6)
- Helianthus annuus L.
- Lea oak 1913-1923 (5, 156)
- Quercus imbricaria Michx.
- Leadplant [Lead plant, Lead-plant]
- 1937 (112) Neb
- Amorpha L.
- 1850-Present (3, 4, 5, 19, 28, 47, 50, 63, 82, 85, 92, 95, 97, 106, 109, 112, 114, 122, 127, 130, 131, 138, 156, 158)
- Amorpha canescens Pursh [also reported as: Amorpha canescens (Nutt.) Pursh]
- 1899-1929 (131, 156, 157)
- Amorpha fruticosa L.
- Leadplant amorpha 1942 (155)
- Amorpha canescens Pursh
- Leadwort 1923 (156)
- Amorpha canescens Pursh
- Leaf mustard 1949 (109)
- Brassica juncea (L.) Czern. [reported as: Brassica juncea Coss.]
- Leaf-buds 1929 (157)
- Populus balsamifera L.
- Leaf-cup [Leafcup]
- 1895-1986 (1, 2, 4, 82, 155, 158)
- Polymnia L.
- 1930 (82) IA
- Polymnia canadensis L.
- 1876-1923 (49, 52, 53, 92, 156)
- Smallanthus uvedalius (L.) Mackenzie ex Small [also reported as: Polymnia uvedalia L.]
- Leafless pyrola 1942 (155)
- Pyrola picta Sm. [reported as: Pyrola aphylla Sm.]
- Leafy blue flag 1913 (5)
- Iris brevicaulis Raf. [reported as: Iris foliosa Mackenzie & Bush]
- Leafy bluebells 1942 (155)
- Mertensia oblongifolia (Nutt.) G. Don [reported as: Mertensia foliosa A. Nels.]
- Leafy euphorbia 1942 (155)
- Euphorbia esula L.
- Leafy false goldenweed Present (50)
- Oonopsis foliosa (Gray) Greene var. foliosa
- Leafy gold-aster [Leafy goldaster] 1942 (155)
- Heterotheca villosa (Pursh) Shinners var. foliosa (Nutt.) Harms [reported as: Chrysopsis foliosa (Nutt.) Shinners]
- Leafy goosefoot Present (50)
- Chenopodium foliosum (Moench) Aschers.
- Leafy madwort 1768 (165)
- Lobularia maritima (L.) Desv. [reported as: Alysson minimum Clus. ]
- Leafy muhly 1942 (155)
- Muhlenbergia mexicana (L.) Trin. [reported as: Muhlenbergia foliosa (Roemer & J.A. Schultes) Trin. ssp. setiglumis (S. Wats.) Scribn.]
- Leafy musineon 1899-1913 (5, 131)
- Musineon divaricatum (Pursh) Raf. [also reported as: Musineon divaricatum (Pursh) Nutt.]
- Leafy pondweed
- 1899-Present (3, 50, 72, 93, 97, 120, 131, 155)
- Potamogeton foliosus Raf.
- Present (50)
- Potamogeton foliosus Raf. ssp. foliosus
- Leafy raspberry 1840 (19)
- Rubus frondosus Bigelow
- Leafy rose 1942-1986 (4, 155)
- Rosa foliolosa Nutt.
- Leafy spurge
- 1977 (3)
- Euphorbia agraria Bieb. [reported as: Euphorbia podperae Croizat]
- 1900-Present (4, 50, 156, 158)
- Euphorbia esula L.
- 1913-Present (5, 50, 93) Neb
- Euphorbia esula L. var. esula [also reported as: Tithymalus esula (L.) Hjill.]
- Leafy wild parsley [Leafy wildparsley]
- Present (50)
- Musineon divaricatum (Pursh) Raf.
- Present (50)
- Musineon divaricatum (Pursh) Raf. var. divaricatum
- Leafy-bract beggarticks [Leafybract beggarticks] 1942 (155)
- Bidens tripartita L. [reported as: Bidens comosa (Gray) Wiegand]
- Leafy-bract tickseed [Leafy-bracted tickseed] 1907-1937 (5, 72, 93, 97)
- Bidens tripartita L. [also reported as: Bidens comosa (Gray) Wiegand]
- Leafy-flower blackberry [Leafy-flowered blackberry] 1913 (5)
- Rubus frondosus Bigelow
- Leafy-stem false dandelion [Leafy-stemmed false dandelion] 1913-1937 (5, 97)
- Pyrrhopappus carolinianus (Walt.) DC. [also reported as: Sitilias caroliniana (Walt.) Raf.]
- Leamington 1892 (73) Ipswich MA
- Artemisia abrotanum L.
- Lean flatsedge Present (50)
- Cyperus setigerus Torr. & Hook.
- Least bluet, Least bluets 1899 (5, 63, 65, 72, 97)
- Houstonia pusilla Schoepf [also reported as: Houstonia minima Beck.]
- Least cryptantha 1937 (97) OK
- Cryptantha minima Rydb.
- Least duckweed
- 1913-1942 (5, 155)
- Lemna minor L. [also reported as: Lemna minima Philipi.]
- Present (50)
- Lemna minuta Kunth [reported as: Lemna minuta Kunth]
- Least hop clover [Least hop-clover] 1913-1937 (5, 122)
- Trifolium dubium Sibth.
- Least hop trefoil [Least hop-trefoil] 1900-1913 (5, 158)
- Trifolium dubium Sibth.
- Least spike-rush [Least spike rush] 1913-1923 (5, 156)
- Eleocharis acicularis (L.) Roemer & J.A. Schultes
- Least-daisy [Leastdaisy, Least daisy]
- Present (50)
- Chaetopappa DC.
- 1937 (122) TX
- Chaetopappa asteroides (Nutt.) DC.
- Leather flower [Leather-flower]
- 1932-Present (1, 50, 93)
- Clematis L. [also reported as: Viorna Reichnb.]
- 1930 (82) IA
- Clematis pitcheri Torr. & Gray
- Leather wood fern [Leather woodfern] 1923-1942 (138, 155)
- Dryopteris marginalis (L.) A. Gray
- Leather-breeches 1930 (106)
- Amsinckia lycopsoides Lehm.
- Leather-root Present (50)
- Orbexilum Raf.
- Leatherweed [Leather-weed] 1986-Present (4, 50)
- Croton pottsii (Klotzsch) Muell. Arg.
- Leathery grape-fern [Leathery grape fern] 1913 (5)
- Botrychium multifidum (Gmel.) Trev. [reported as: Botrychium matricariae (Schrank) Spreng., Botrychium multifidum (Gmel.) Rupr.]
- Leathery knotweed 1942-Present (50, 155)
- Polygonum achoreum Blake
- Leavenworth's eryngo [Leavenworth eryngo] 1913-Present (3, 4, 5, 50, 97, 155) OK
- Eryngium leavenworthii Torr. & Gray
- Leavenworth's sedge [Leavenworth sedge] 1893-Present (3, 5, 50, 72)
- Carex leavenworthii Dewey
- Leavenworth's vetch
- 1937-Present (50, 97) OK
- Vicia ludoviciana Nutt. ssp. ludoviciana [also reported as: Vicia leavenworthia T. & G.]
- 1986 (4)
- Vicia ludoviciana Nutt. ssp. ludoviciana [reported as: Vicia exigua Torr. & Gray]
- Lebelie Syphilitique (French) 1892 (6)
- Lobelia siphilitica L.
- Ledingham's false dragonhead Present (50)
- Physostegia ledinghamii (Boivin) Cantino
- Leechwort [Leech-wort] 1900-1923? (5, 156, 157, 158) obsolete by 1923
- Plantago lanceolata L.
- Leek
- 1918-1970 (121)
- Allium L.
- 1840-1977 (3, 19, 92, 109, 138, 155, 158)
- Allium porrum L.
- Leek cress 1900-1923 (156, 158)
- Alliaria petiolata (Bieb.) Cavara & Grande [also reported as: Alliaria alliaria (L.) Britton, Alliaria officinalis Andrz.]
- Leindotter (German) 1900 (158)
- Camelina sativa (L.) Crantz
- Leinkraut (German) 1892-1900 (6, 158)
- Linaria vulgaris P. Mill. [also reported as: Linaria linaria (L.) Karst., Linaria vulgaris Hill]
- Lelache 1923 (156)
- Syringa vulgaris L.
- Lemita
- 1904 (149) NM
- Rhus trilobata Nutt.
- 1913 (153) NM
- Rhus trilobata Nutt. var. trilobata [reported as: Schmaltzia tribolata (Nutt.) Small.]
- Lemmon’s acacia [Lemmons acacia] 1942 (155)
- Acacia angustissima (P. Mill.) Kuntze [reported as: Acacia lemmoni ]
- Lemmon's wool grass [Lemmon's wool-grass] 1901 (94)
- Eriochloa lemmonii Vasey & Scribn.
- Lemon beebalm
- 1942-Present (3, 4, 50, 155)
- Monarda citriodora Cerv. ex Lag.
- Present (50)
- Monarda citriodora Cerv. ex Lag. ssp. citriodora
- Present (50)
- Monarda citriodora Cerv. ex Lag. ssp. citriodora var. citriodora
- Lemon mint
- 1937 (124) TX
- Hedeoma drummondii Benth.
- 1932 (1)
- Monarda L.
- 1923-1986 (4, 156)
- Monarda citriodora Cerv. ex Lag.
- 1932 (1)
- Monarda pectinata Nutt.
- Lemon monarda
- 1923 (156)
- Monarda citriodora Cerv. ex Lag.
- 1926-1937 (97, 98)
- Monarda pectinata Nutt.
- Lemon scurf-pea [Lemon scurf pea, Lemon scurfpea] 1926-Present (4, 50, 98)
- Psoralidium lanceolatum (Pursh) Rydb. [also reported as: Psoralea lanceolata Pursh]
- Lemon walnut 1898-1929 (5, 92, 156, 157, 158)
- Juglans cinerea L.
- Lemonade sumac 1923 (138)
- Rhus trilobata Nutt.
- Lemon-apple [Lemon apple] 1922 (53)
- Podophyllum peltatum L.
- Lemon-scent [Lemon scent, Lemonscent]
- 1932 (1)
- Pectis L.
- Present (50)
- Pectis angustifolia Torr.
- Lemon-scented pectis [Lemon scented pectis] 1913-1937 (5, 93, 122, 124)
- Pectis angustifolia Torr.
- Lemonweed [Lemon weed] 1930 (106)
- Psoralidium lanceolatum (Pursh) Rydb. [reported as: Psoralea lanceolata Pursh]
- Lens pepperweed 1942 (155)
- Cardaria chalapensis (L.) Hand.-Maz. [reported as: Lepidium repens (Schrenk) Boiss.]
- Lens-pod hoary cress [Lens-podded hoary cress] 1986 (4)
- Cardaria chalapensis (L.) Hand.-Maz.
- Lens-pod whitetop [Lenspod whitetop] Present (50)
- Cardaria chalapensis (L.) Hand.-Maz.
- Lentiscus-leaf sumac [Lentiscus-leaved sumach] 1785 (8)
- Rhus copallinum L.
- Leonard's skullcap Present (50)
- Scutellaria parvula Michx.var. missouriensis (Torr.) Goodman & Lawson
- Leonard's small skullcap [Leonard small skullcap] 1977 (3)
- Scutellaria parvula Michx.var. missouriensis (Torr.) Goodman & Lawson [reported as: Scutellaria parvula Michx. var. leonardii (Epl.) Fern.]
- Leonurus 1917 (57)
- Leonurus cardiaca L.
- Leopard-lily [Leopard lily]
- 1900-1913 (5, 158)
- Belamcanda chinensis (L.) DC. [also reported as: Gemmingia chinensis (L.) Kuntze]
- 1932-1936 (1, 93)
- Fritillaria L.
- 1918-1977 (3, 85, 121, 127)
- Fritillaria atropurpurea Nutt.
- Leopard-flower 1923 (156)
- Belamcanda chinensis (L.) DC.
- Leopard's-bane [Leopard's bane)] 1828-1900 (7, 156)
- Arnica L.
- Leptandra 1911-1922 (53, 55, 57, 59)
- Veronicastrum virginicum (L.) Farw. [also reported as: Leptandra virginica (L.) Nutt., Veronica virginica L.]
- Leptandre rouge (French) 1828 (7)
- Veronicastrum virginicum (L.) Farw. [reported as: Leptandra purpurea Raf.]
- Leptochloa 1938 (119) OK
- Leptochloa fusca (L.) Kunth ssp. fascicularis (Lam.) N. Snow [reported as: Leptochloa fascicularis (Lam.) Gray]
- Lespedeza 1942-Present (4, 50, 155)
- Lespedeza Michx.
- Less burdock 1814 (167)
- Xanthium L.
- Less fleabane [Less flea bane] 1814 (167)
- Erigeron L.
- Lesser bladderwort 1907-Present (4, 5, 50, 72, 93)
- Utricularia minor L.
- Lesser bog orchid Present (50)
- Platanthera stricta Lindl. [reported as: Platanthera stricta Lindl.]
- Lesser burdock
- 1900-1929 (50, 157, 158) misapplied
- Arctium minus Bernh.
- 1900 (158)
- Xanthium strumarium L.
- 1923 (156)
- Xanthium strumarium L. var. canadense (P. Mill.) Torr. & Gray [reported as: Xanthium canadense P. Mill.]
- 1913 (5)
- Xanthium strumarium L. var. glabratum (DC.) Cronq. [reported as: Xanthium americanum Walt.]
- Lesser clearweed Present (50)
- Pilea fontana (Lunell) Rydb.
- Lesser clotbur [Lesser clot-bur] 1671 (46) Josselyn
- Xanthium strumarium L.
- Lesser clover dodder 1930 (82) IA
- Cuscuta epithymum (L.) L. [reported as: Cuscuta epithymum Murray]
- Lesser dodder 1900 (158)
- Cuscuta epithymum (L.) L. [reported as: Cuscuta epithymum Murray]
- Lesser duckweed
- Present (50)
- Lemna aequinoctialis Welw.
- 1907-1937 (5, 72, 93, 97)
- Lemna minor L.
- Lesser fringed gentian Present (50)
- Gentianopsis virgata (Raf.) Holub
- Lesser lucerne dodder 1913-1923 (5, 156)
- Cuscuta epithymum (L.) L. [also reported as: Cuscuta epithymum Murray]
- Lesser purple fringed orchid Present (50)
- Platanthera psycodes (L.) Lindl.
- Lesser rattlesnake-plantain [Lesser rattlesnake plantain] 1913-Present (50, 5, 109, 156)
- Goodyera repens (L.) R. Br. ex Ait. f. [also reported as: Epipactis repens [Crantz], Peramium ophioides (Fernald) Rydb.]
- Lesser reed-mace 1840-1882 (5, 10, 14, 34)
- Typha angustifolia L.
- Lesser round-leaf orchid [Lesser roundleaved orchid] Present (50)
- Platanthera orbiculata (Pursh) Lindl. [reported as: Platanthera orbiculata (Pursh) Lindl.]
- Lesser spike-moss [Lesser spikemoss]
- Present (50)
- Selaginella densa Rydb.
- Present (50)
- Selaginella densa Rydb. var. densa
- Lesser starwort 1913 (5)
- Stellaria graminea L. [reported as: Alsine graminea (L.) Britton]
- Lesser stitchwort 1913 (5)
- Stellaria graminea L. [reported as: Alsine graminea (L.) Britton]
- Lesser water-parsnip [Lesser water parsnip] 1900-1913 (5, 158)
- Berula erecta (Huds.) Coville
- Lesser waterweed [Lesser water-weed] 1913-1938 (5, 120)
- Elodea nuttallii (Planch.) St. John [also reported as: Philotria minor (Engelm.) Small.]
- Lesser wintergreen 1923 (156)
- Pyrola elliptica Nutt.
- Lesser yellow lady's-slipper [Lesser yellow lady's slipper] Present (50)
- Cypripedium parviflorum Salisb.
- Lesser-panicle sedge [Lesser-panicled sedge] 1913-Present (5, 50)
- Carex diandra Schrank
- Lettuce [Lettice]
- 1818-Present (1, 4, 7, 10, 50, 63, 82, 93, 138, 155, 156, 158)
- Lactuca L. [also reported as: Lactuca (Tourn.) L.]
- 1930 (106)
- Lactuca floridana (L.) Gaertn.
- 1840-1949 (19, 109, 110)
- Lactuca sativa L. [also reported as: Lactuca scariola L. var. sativa (Moris)]
- 1671 (46) cultivated by English colonists by 1671, Josselyn
- Lactuca serriola L.
- Lettuce-liverwort [Lettuce liverwort] 1876 (92)
- Pyrola americana Sweet [reported as: Pyrola rotundifolia L.]
- Leucospora
- Present (50)
- Leucospora Nutt.
- 1977-1986 (3, 4)
- Leucospora multifida (Michx.) Nutt.
- Levant soapwort 1917 (57)
- Gypsophila paniculata L.
- Levers 1900 (158)
- Sparganium L.
- Leverwood [Lever wood, Lever-wood] 1879-1894 (49, 75)
- Ostrya virginiana (P. Mill.) K. Koch [also reported as: Carpinus ostrya L., Ostrya virginica Willd., possibly Ostrya virginiana]
- Lewis and Clarke's currant 1850 (28)
- Ribes aureum Pursh
- Lewis’ flax [Lewis flax] 1942 (155)
- Linum lewisii Pursh [reported as: Linum lewisi]
- Lewis' wild flax 1899-1937 (5, 97, 131)
- Linum lewisii Pursh
- Liard (French)
- 1796-1806 (17, 35)
- Populus L.
- 1796 (17)
- Populus ×canadensis Moench [deltoides × nigra] [reported as: Populus caroliniana]
- 1810-1811 (23, 27)
- Populus deltoides Bartr. ex Marsh. ssp. deltoides [also reported as: Populus angulosa Michx., Populus angulata Aiton]
- Liard amere (French) 1850 (28)
- Populus angustifolia James
- Liberty 1892 (73) Chestertown MD
- Lycopodium complanatum L.
- Liberty tea [Liberty-tea] 1913-1923? (5, 156)
- Lysimachia quadrifolia L.
- Licheta 1893-1898 (71, 74) Vermont
- Agrostemma githago L. [also reported as: Lychnis githago (L.) Scop.]
- Lichwale 1900-1929 (157, 158)
- Buglossoides arvensis (L.) I.M. Johnston [also reported as: Lithospermum arvense L.]
- Licorice [Liquorice]
- 1923 (156) misapplied
- Amphicarpaea bracteata (L.) Fern. [reported as: Amphicarpa monoica Ell.]
- 1930-1937 (106, 122)
- Glycyrrhiza lepidota Pursh [also reported as: Glycorhiza lepidota]
- Licorice bedstraw
- Present (50)
- Galium circaezans Michx.
- Present (50)
- Galium circaezans Michx.var. hypomalacum Fern.
- Licorice fern 1937 (124) TX
- Polypodium virginianum L.
- Licorice-root [Licorice root]
- 1896-1923 (5, 76, 124, 156)
- Glycyrrhiza lepidota Pursh1919 (107)
- Hedysarum boreale Nutt. [reported as: Hedysarum mackenzii Richards]
- Lieberg's panicum [Leiberg panicum] 1893-Present (3, 5, 50, 56, 72, 155)
- Dichanthelium leibergii (Vasey) Freckmann[also reported as: Panicum leibergii (Vasey) Scribn.]
- Liebfrauenstroh (German) 1900 (158)
- Galium verum L.
- Lierre terrestre (French) 1900 (158)
- Glechoma hederacea L.
- Life everlasting 1929 (157)
- Pseudognaphalium obtusifolium (L.) Hilliard & Burtt ssp. obtusifolium [reported as: Gnaphalium polycephalum Michx., Gnaphalium obtusifolium L.]
- Life-everlasting [Life everlasting]
- 1900 (158)
- Anaphalis DC.
- 1770-1913 (5, 41, 106, 158) Eastern U.S.
- Anaphalis margaritacea (L.) Benth. & Hook [also reported as: Gnaphalium margaritaceum]
- 1876 (92)
- Gnaphalium L.
- 1892-1917 (6, 57, 73, 145, 157)
- Pseudognaphalium obtusifolium (L.) Hilliard & Burtt ssp. obtusifolium [also reported as: Gnaphalium polycephalum Michx., Gnaphalium obtusifolium L.]
- Life-of-man [Life of man, Life-o'-man]
- 1892 (73) NH
- Anaphalis margaritacea (L.) Benth. & Hook
- 1828 (7)
- Aralia nudicaulis L.
- 1892-1929 (5, 6, 64, 73, 75, 92, 156, 157, 158)
- Aralia racemosa L.
- 1892-1913 (5, 73) Stratham NH
- Pseudognaphalium obtusifolium (L.) Hilliard & Burtt ssp. obtusifolium [also reported as: Gnaphalium polycephalum Michx., Gnaphalium obtusifolium L.]
- Light poppy-mallow [Light poppy mallow, Light poppymallow] 1913-Present (50, 5, 97, 122)
- Callirhoe alcaeoides (Michx.) Gray [also reported as: Callirrhoe alceoides]
- Light-blue wild hyacinth 1931 (65) OK
- Camassia scilloides (Raf.) Cory [reported as: Quamasia hyacinthina (Raf.) Britton]
- Lighthouses [Light-houses] 1898 (77) Southold Long Island, from speed with which they tower above crops in the field
- Amaranthus retroflexus L.
- Light-o'-love 1923 (156)
- Eriophorum L.
- Liho, lino, or li (Basque) 1886 (110)
- Linum usitatissimum L.
- Lilac 1828-1937 (5, 7, 19, 63, 85, 97, 114)
- Syringa vulgaris L. [also reported as: Lilaca vulgaris Tt.]
- Lilac aster 1932 (85) SD
- Symphyotrichum lanceolatum (Willd.) Nesom ssp. hesperium (Gray) Nesom [reported as: Aster laetevirens Greene]
- Lilac bird-foot violet [Lilac birdsfoot violet] 1923-1942 (138, 155)
- Viola pedata L. [also reported as: Viola pedata lineariloba, Viola pedata L. var. lineariloba DC.]
- Lilac chaste tree [Lilac chaste-tree, Lilac chastetree] 1923-Present (50, 138, 155)
- Vitex agnus-castus L.[also spelled: Vitex agnuscastus]
- Lilac penstemon
- Present (50)
- Penstemon gracilis Nutt.
- Present (50)
- Penstemon gracilis Nutt. var. gracilis
- Lilaca 1876 (92)
- Syringa vulgaris L. [reported as: Lilaca vulgaris Tt.]
- Lilium convallium 1879? (49)
- Convallaria majalis L.
- Lilly convallie 1671 (46) Josselyn
- Uvularia sessilifolia L.
- Lily 1814-Present (50, 1, 7, 10, 93, 109, 138, 155, 156, 158, 167) from Latin for "most charming of flowers" or from ancient Greek name of a lily
- Lilium L. [also reported as: Lilium (Tourn.) L.]
- Lily orchis 1840 (19)
- Listera convallarioides (Sw.) Nutt. ex Ell.
- Lily twaybalde 1923 (138)
- Liparis loeselii (L.) L.C. Rich [reported as: Liparis liliifolia (L.) L.C. Rich]
- Lily-bind [Lily-bind] 1900-1923 (5, 158)
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [also reported as: Convolvulus sepium L.]
- Lily-grass [Lily grass] 1818-1828 (7, 10)
- Sisyrinchium L.
- Lily-of-the-valley [Lily of the valley, Lilyofthevalley]
- 1818-Present (2, 10, 50, 109, 138, 156, 158)
- Convallaria L.
- 1828-1942 (5, 7, 49, 52, 53, 54, 55, 57, 59, 60, 85, 92, 138, 148, 155, 156, 158)
- Convallaria majalis L.
- 1892 (73) NH
- Maianthemum canadense Desf.
- Lily-vine 1923? (156) obsolete by 1923
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [reported as: Convolvulus sepium L.]
- Limber Bill 1896 (45)
- Muhlenbergia glomerata (Willd.) Trin.
- Limber honeysuckle 1923-Present (4, 50, 138, 155, 156)
- Lonicera dioica L.
- Limber pine 1796-Present (1, 3, 5, 17, 19, 50, 85, 109, 112, 122, 136, 138, 153, 155)
- Pinus flexilis James [also reported as: Apinus flexilis (James) Rydb.]
- Limber-spine cactus [Limber-spined cactus] 1937 (97) OK
- Opuntia polyacantha Haw. var. trichophora (Engelm. & Bigelow) Coult. [reported as: Opuntia trichophora (Engelm.) Britton & Rose]
- Lime 1919-1949 (107, 109)
- Tilia L.
- Lime grass 1840-1876 (19, 92)
- Elymus villosus Muhl. ex Willd.
- Lime tree [Lime-tree, Limetree]
- 1785-1900 (8, 10, 13, 15, 158, 167)
- Tilia L.
- 1770-1930 (5, 41, 92, 106, 156)
- Tilia americana L.
- 1840-1876 (19, 92)
- Tilia americana L. var. americana [also reported as: Tilia glabra Vent.]
- Limestone adder's-tongue [Limestone adder's tongue, Limestone adderstongue] 1986-Present (4, 50)
- Ophioglossum engelmannii Prantl.
- Limestone calamint Present (50)
- Clinopodium arkansanum (Nutt.) House
- Limestone meadow sedge
- Present (50)
- Carex granularis Muhl. ex Willd.
- Present (50)
- Carex granularis Muhl. var. granularis
- Present (50)
- Carex granularis Muhl. ex Willd. var. haleana (Olney) Porter
- Limestone quillwort Present (50)
- Isoetes butleri Engelman
- Limestone ruellia 1942-1986 (3, 4, 155)
- Ruellia strepens L.
- Limestone wild petunia Present (50)
- Ruellia strepens L.
- Lime-water brookweed [Limewater brookweed]
- Present (50)
- Samolus ebracteatus Kunth
- Present (50)
- Samolus ebracteatus Kunth ssp. cuneatus (Small) R. Knuth
- Limewort 1878 (86) beacuse many species exude sticky substance like bird lime
- Silene L.
- Limonilla 1900-1937 (122, 158)
- Hymenoxys odorata DC. [also reported as: Actinea odorata (DC.) Kuntze, Picradenia odorata (DC.) Britton]
- Limonillo 1913-1937 (5, 97)
- Hymenoxys odorata DC.
- Lin 1900-1913 (5, 158)
- Linum usitatissimum L.
- Lin (Keltic) 1886 (110)
- Linum usitatissimum L.
- Lin tree 1896-1913 (5, 76) Sulphur Grove OH
- Tilia americana L.
- Lin, llin, linu, linon, linum, lein, or lan (European languages with Aryan roots) 1886 (110) from same root as ligare "to bind"
- Linum usitatissimum L.
- Linaire commune (French) 1892-1900 (6, 158)
- Linaria vulgaris P. Mill. [also reported as: Linaria linaria (L.) Karst., Linaria vulgaris Hill]
- Linden or Linden tree
- 1785-1986 (1, 2, 4, 7, 8, 10, 13, 15, 92, 93, 109, 122, 138, 155, 158)
- Tilia L. [also reported as: Tilia (Tourn.) L.]
- 1649-1986 (4, 41, 46, 49, 57, 65, 82, 106, 112, 121, 135)
- Tilia americana L. [also reported as: Tila americana (Tourn.) L.]
- Lindheimer's croton 1913-1937 (5, 97)
- Croton lindheimerianus Scheele
- Lindheimer's daisy 1937 (124) TX
- Lindheimera texana Gray & Engelm.
- Lindheimer's globeberry Present (50)
- Ibervillea lindheimeri (Gray) Greene
- Lindheimer's goldenrod [Lindheimer's golden-rod, Lindheimer goldenrod] 1913-1942 (5, 97, 122, 155)
- Solidago petiolaris Aiton var. angusta (Torr. & Gray) Gray [also reported as: Solidago lindheimeriana Scheele]
- Lindheimer's hogwort Present (50)
- Croton capitatus Michx. var. lindheimeri (Engelm. & Gray) Muell.
- Lindheimer's lip fern [Lindheimer lipfern] 1942-1986 (4, 155)
- Cheilanthes lindheimeri (Sm.) Hook.
- Lindheimer's long-leaf eriogonum [Lindheimer's longleaf eriogonum] 1986 (4)
- Eriogonum longifolium Nutt. var. longifolium [reported as: Eriogonum longifolium Nutt. var. lindheimeri Grand.]
- Lindheimer's milkvetch [Lindheimer milk vetch] 1986-Present (4, 50)
- Astragalus lindheimeri Engelm. Gray
- Lindheimer's milkweed 1937 (97)
- Asclepias oenotheroides Cham. & Schlecht. [reported as: Asclepias lindheimeri Engelm. & A. Gray]
- Lindheimer's panic grass [Lindheimer panicgrass, Lindheimer's panic-grass] 1852-Present (50, 163)
- Dichanthelium acuminatum (Sw.) Gould & C.A. Clark var. lindheimeri (Nash) Gould & C.A. Clark [also reported as: Panicum lindheimeri Nash]
- Lindheimer's panicum [Lindheimer panicum] 1913-1942 (5, 155)
- Dichanthelium acuminatum (Sw.) Gould & C.A. Clark var. lindheimeri (Nash) Gould & C.A. Clark [also reported as: Panicum lindheimeri Nash]
- Lindley's aster [Lindley aster] 1899-Present (5, 50, 82, 131, 155)
- Symphyotrichum ciliolatum (Lindl.) A.& D. Löve [also reported as: Aster lindleyana Torr. & Gray, Aster lindleyanus Torr. & Gray]
- Line tree 1671 (46) Josselyn
- Tilia americana L.
- Linear-leaf baccharis [Linearleaf baccharis, Linear-leaved baccharis] 1913-1937 (5, 93, 97, 122)
- Baccharis salicina Torr. & Gray [also reported as: Baccharis neglecta Britton]
- Linear-leaf krameria [Linear-leaved krameria] 1900-1937 (5, 97, 158)
- Krameria lanceolata Torr. [also reported as: Krameria secundiflora DC.]
- Linear-leaf ladies'-tresses [Linear-leaved ladies' tresses, Linear-leaved ladies'-tresses] 1913-1937 (5, 97)
- Spiranthes vernalis Engelm. & Gray [also reported as: Ibidium vernale (Engelm. & Gray) House.]
- Linear-leaf loosestrife [Linear-leaved loosestrife] 1900-1913 (5, 158) Book name
- Lysimachia quadrifolia L. [also reported as: Steironema quadriflorum (Sims.) A.S. Hitchc.]
- Linear-leaf panicum [Linear-leaved panicum] 1901 (56) IA
- Dichanthelium linearifolium (Scribn. ex Nash) Gould [reported as: Panicum linearifolium Scribn.]
- Linear-leaf sunflower [Linear-leaved sunflower] 1913-1937 (5, 93, 97)
- Helianthus salicifolius A. Dietr. [also reported as: Helianthus orgyalis DC.]
- Linear-leaf willow [Linear-leaved willow] 1937 (97) OK
- Salix exigua Nutt. [reported as: Salix linearifolia Rydb.]
- Linear-leaf willow herb [Linear-leaved willow herb, Linear-leaved willow-herb] 1907-1936 (5, 72, 93)
- Epilobium palustre L. [also reported as: Epilobium lineare Muhl.]
- Linear-leaf wormwood [Linearleaf wormwood, Linear-leaved wormwood] 1907-1937 (5, 72, 93, 97, 122)
- Artemisia dracunculus L. [also reported as: Artemisia dracunculoides Pursh]
- Linn [Lynn]
- 1923 (156)
- Linum usitatissimum L.
- 1937 (124) TX
- Tilia L.
- 1806 (35) William Clark, Ordway
- Tilia americana L.
- Linn tree [Linn-tree] 1898-1923 (49, 156)
- Tilia americana L.
- Linnwood 1923 (156)
- Tilia americana L.
- Linon or linum (Graeco-Latin) 1886 (110)
- Linum usitatissimum L.
- Linseed 1876-1929 (5, 53, 57, 59, 92, 95, 156, 157)
- Linum usitatissimum L.
- Lint 1900-1923 (156, 158)
- Linum usitatissimum L.
- Lint-bells [Lint bells] 1900-1937 (5, 97, 156, 158)
- Linum usitatissimum L.
- Linum 1911 (59)
- Linum usitatissimum L.
- Lion's-beard [Lion's beard]
- 1932 (1)
- Clematis L. [reported as: Viorna Reichnb.]
- 1932 (1)
- Pulsatilla P. Mill. [reported as: Pulsatilla Adans.]
- Lion's-ear [Lions' ear, Lion ears, Lion's ear] 1876-1929 (5, 92, 156, 157, 158)
- Leonurus cardiaca L.
- Lion's-foot [Lion's foot, Lions' foot]
- 1929 (157)
- Antennaria parviflora Nutt.
- 1828-1882 (7, 48)
- Prenanthes L. [also reported as: Nabalus Cass.]
- 1929 (157)
- Prenanthes aspera Michx. [reported as: Nabalus asper (Michx.) Torr. & Gray]
- 1870-1923 (5, 49, 61, 92, 156, 158)
- Prenanthes alba L. [also reported as: Nabalus albus (L.) Hook.]
- Lion's-heart [Lion's heart, Lionsheart]
- 1923 (156)
- Dracocephalum parviflorum Nutt.
- 1900-Present (4, 50, 155, 158)
- Physostegia Benth.
- 1900-1923 (5, 156, 158)
- Physostegia virginiana (L.) Benth.
- 1834 (34)
- Prenanthes alba L. [reported as: Prenanthes rubicunda]
- Lion's-leaf 1900 (158)
- Caulophyllum Michx. [reported as: Leontice L.]
- Lion's-mouth [Lion's mouth, Lion mouth]
- 1892-1923 (5, 73, 156, 158) Mansfield OH
- Antirrhinum majus L.
- 1903-1923? (5, 69, 156) obsolete by 1923
- Digitalis pupurea L.
- Lion's-snap [Lion's snap] 1876-1923 (5, 92, 156, 158)
- Antirrhinum majus L.
- Lion's-tail [Lion's tail, Lions' tail, Lionstail]
- Present (50)
- Chaiturus Willd.
- 1913-Present (5, 50)
- Chaiturus marrubiastrum (L.) Reichenb. [also reported as: Leonurus marrubiastrum L.]
- 1900 (158)
- Leonurus L.
- 1828-1929 (7, 92, 156, 157, 158)
- Leonurus cardiaca L.
- 1913 (5)
- Leonurus sibiricus L.
- Lion's-tooth [Lion's tooth]
- 1900-19123 (5, 157, 158) Book name
- Taraxacum officinale G.H. Weber ex Wiggers [also reported as: Leontodon taraxacum L., Taraxacum taraxacum L.]
- 1930 (82) IA
- Taraxacum officinale G.H. Weber ex Wiggers ssp. officinale [reported as: Taraxacum dens-leonis Desf.]
- Lip fern [Lip-fern, Lipfern]
- 1900-Present (1, 4, 50, 138, 155, 158)
- Cheilanthes Sw.
- 1907-1977 (3, 72) IA
- Cheilanthes feei T. Moore
- 1840 (19)
- Cheilanthes lanosa (Michx.) D.C.Eat. [reported as: Cheilanthes vestita Swartz.]
- Lippia 1930 (106)
- Phyla nodiflora (L.) Greene [reported as: Lippia repens , Lippia nodiflora (L.) Michx.)]
- Liria Americana (Spanish) 1900 (158)
- Iris versicolor L.
- Liricon-fancy 1900 (158) verbal corruption
- Convallaria majalis L.
- Liris de los valles (Spanish) 1900 (158)
- Convallaria majalis L.
- Liseron Mechamec (French) 1828 (7)
- Ipomoea pandurata (L.) G.F.W. Mey. [reported as: Convolvulus panduratus Michx.]
- Lithospermum arvense radice rubra 1622 (46) Bauhin
- Buglossoides arvensis (L.) I.M. Johnston [reported as: Lithospermum arvense L.]
- Little mallow 1942 (155)
- Malva parviflora L.
- Little barley 1852-Present (3, 5, 50, 56, 72, 80, 93, 94, 119, 122, 134, 140, 155, 163)
- Hordeum pusillum Nutt.
- Little bladderwort 1911 (95) Neb
- Utricularia minor L.
- Little bluestem [Little blue stem, Little blue-stem]
- Present (50)
- Schizachyrium Nees
- Present (50)
- Schizachyrium scoparium (Michx.) Nash
- 1852-Present (3, 11, 22, 50, 56, 65, 85, 93, 94, 98, 111, 115, 119, 124, 129, 134, 140, 144, 146, 155, 163)
- Schizachyrium scoparium (Michx.) Nash var. scoparium [also reported as: Andropogon scoparius Michx.]
- Little breadroot scurf pea 1977-1986 (3, 4)
- Pediomelum hypogaeum (Nutt. ex Torr. & Gray) Rydb. var. hypogaeum [also reported as: Psoralea hypogaea Nutt.]
- Little buckeye 1840 (19)
- Aesculus glabra Willd.
- Little club-moss 1818-1932 (1, 10, 19)
- Selaginella Beauv.
- Little cord grass 1894-1915 (111, 129)
- Spartina gracilis Trin.
- Little cryptantha Present (50)
- Cryptantha minima Rydb.
- Little duckweed Present (50)
- Lemna obscura (Austin) Daubs
- Little ebony 1913 (5)
- Asplenium resiliens Kunze.
- Little grape-fern 1913-Present (4, 5, 50)
- Botrychium simplex E. Hitchcock.
- Little green sedge Present (50)
- Carex viridula Michx.
- Little ground-rose [Little ground rose] 1986 (4)
- Chamaerhodos erecta (L.) Bunge
- Little hogweed Present (50)
- Portulaca oleracea L.
- Little house-leek [Little house leek, Little houseleek] 1913-1923 (5, 156)
- Sedum acre L.
- Little ladies'-tresses [Little ladies' tresses, Little ladiestresses]
- 1913-1937 (5, 122)
- Spiranthes lacera (Raf.) Raf. var. gracilis (Bigelow) Luer [also reported as: Ibidium beckii (Lindl.) House., Spiranthes beckii Lindl.]
- 1913-Present (3, 5, 50)
- Spiranthes tuberosa Raf.
- Little larkspur 1942-Present (4, 50, 155)
- Delphinium bicolor Nutt.
- Little love grass [Little lovegrass] 1977-Present (3, 50)
- Eragrostis minor Host [also reported as: Eragrostis poaeoides Beauv.]
- Little medic 1942 (155)
- Medicago minima L.
- Little merry-bells [Little merrybells] 1923-1942 (138, 155)
- Uvularia sessilifolia L.
- Little mouse-tail [Little mouse tail] 1913 (5)
- Myosurus minimus L.
- Little nipple cactus Present (50)
- Mam
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