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- Maa zhon (Omaha-Ponca, cotton tree) 1919 (37)
- Populus deltoides Bartr. ex Marsh. ssp. monilifera (Aiton) Eckenwalder [reported as: Populus sargentii Dode.]
- Maazi (Omaha-Ponca) 1830 (37)
- Juniperus virginiana L.
- Macanet grains 1876 (92)
- Prunus mahaleb L. [reported as: Cerasus mahaleb]
- Mace-reed 1882 (14)
- Typha latifolia L.
- Mackensen's prickly pear [Mackensen pricklypear] 1942 (155)
- Opuntia macrorhiza Engelm. var. macrorhiza [reported as: Opuntia mackensenii Rose]
- Mackerel mint [Mackerel-mint] 1900-1923 (5, 156, 158)
- Mentha spicata L.
- Macloskey's violet [Macloskey violet] 1942 (155)
- Viola macloskeyi Lloyd
- Maclura Present (50)
- Maclura Nutt.
- Macock 1886? (110) early Anglo-American travelers
- Cucurbita maxima Dcne.
- Macock gourd 1610 (46)
- Cucurbita pepo L. [reported as: Cucurbita polymorpha ]
- Macoun's barley Present (50)
- ×Elyhordeum macounii (Vasey) Barkworth & D.R. Dewey [Elymus trachycaulus × Hordeum jubatum]
- Macoun's blue-joint reed grass [Macoun bluejoint reedgrass] 1942 (155)
- Calamagrostis canadensis (Michx.) Beauv. var. macouniana (Vasey) Stebbins
- Macoun's buttercup [Macoun's buttercups] 1899-Present (3, 4, 5, 50, 127, 131)
- Ranunculus macounii Britton [also reported as: Ranunculus rivularis Rydb.]
- Macoun's cudweed Present (50)
- seudognaphalium macounii (Greene) Kartesz
- Macoun's false bindweed Present (50)
- Calystegia macounii (Greene) Brummitt
- Macoun's lyme grass [Macoun's lyme-grass] 1901-1915 (56, 94, 111)
- ×Elyhordeum macounii (Vasey) Barkworth & D.R. Dewey [Elymus trachycaulus × Hordeum jubatum] [also reported as: Elymus macounii Vasey]
- Macoun's reed bent [Macoun's reed-bent] 1901 (56, 94)
- Calamagrostis canadensis (Michx.) Beauv. var. macouniana (Vasey) Stebbins [also reported as: Calamagrostis macouniana Vasey]
- Macoun's reed grass [Macoun's reedgrass] 1913-Present (50, 5)
- Calamagrostis canadensis (Michx.) Beauv. var. macouniana (Vasey) Stebbins [also reported as: Calamagrostis macouniana Vasey]
- Macoun's rose [Macoun rose] 1923-1942 (138, 155)
- Rosa woodsii Lindl. var. woodsii [also reported as: Rosa macounii Greene]
- Macoun's wild rye [Macoun wildrye] 1907-1942 (5, 72, 155)
- ×Elyhordeum macounii (Vasey) Barkworth & D.R. Dewey [Elymus trachycaulus × Hordeum jubatum] [also reported as: Elymus macounii Vasey]
- Madagascar dropseed Present (50)
- Sporobolus coromandelianus (Retz.) Kunth
- Mad-apple [Mad-apple] 1892 (5, 6, 69, 71, 92, 156, 158)
- Datura stramonium L.
- Madder 1900-1929 (157, 158) misapplied
- Anthemis cotula L.
- Madderwort [Maderwort] 1900-1929 (5, 156, 157, 158)
- Artemisia absinthium L.
- Mad-dog [Mad dog] 1913-1929 (5, 157)
- Scutellaria lateriflora L.
- Mad-dog skullcap [Mad-dog skull-cap, Mad-dog skull cap, Mad dog skullcap, Mad dog skull cap, Mad-dog scullcap, Mad dog scullcap] 1840-1929 (2, 6, 19, 63, 72, 75, 82, 93, 131, 156, 157, 158)
- Scutellaria lateriflora L.
- Mad-dog weed [Mad dog weed] 1840-1923? (19, 58, 92, 156)
- Alisma plantago-aquatica L. [also reported as: Alisma plantago L.]
- Mad-dog weed [Mad dog weed]
- 1913-1929 (5, 157)
- Alisma subcordatum Raf.
- 1876-1892 (6, 92)
- Scutellaria lateriflora L.
- Maden-weed 1900-1929 (157, 158)
- Anthemis cotula L.
- Madnep [Mad-nep]
- 1876-1929 (92, 157, 158)
- Heracleum maximum Bartr. [also reported as: Heracleum lanatum Michx.]
- 1900-1929 (156, 157, 158)
- Pastinaca sativa L.
- Madness 1900-1929 (157, 158)
- Heracleum maximum Bartr. [also reported as: Heracleum lanatum Michx.]
- Madweed [Mad-weed] 1892-1929 (5, 6, 49, 52, 53, 92, 56, 157, 158)
- Scutellaria lateriflora L.
- Mad-women's-milk [Mad woman's milk, Mad-women's milk, Madwoman's milk] 1913-Present (5, 50)
- Euphorbia helioscopia L. [also reported as: Tithymalus helioscopia (L.) Hill.]
- Madwort
- 1923-Present (50, 109, 156)
- Alyssum L.
- 1923-1986 (4, 156)
- Asperugo L.
- 1923 (156)
- Asperugo procumbens L.
- 1840-1929 (5, 19, 92, 156, 157, 158) misapplied
- Camelina sativa (L.) Crantz
- 1876-1923 (5, 92, 156)
- Lobularia maritima (L.) Desv. [also reported as: Alyssum maritimum (L.) Lam., Koniga maritima (L.) R. Br.]
- Magdalene daisy [Magdalene-daisy] 1900 (158)
- Leucanthemum vulgare Lam. [reported as: Chrysanthemum leucanthemum L.]
- Maggoty boy bean [Magoty boy bean]
- 1913 (5)
- Chamaecrista fasciculata (Michx.) Greene
- 1893-1913 (5, 74, 156) NY, obsolete by 1923
- Chamaecrista fasciculata (Michx.) Greene var. fasciculata [also reported as: Cassia chamaecrista L.]
- Magnolia waterlily 1923-1942 (138, 155)
- Nymphaea odorata Aiton ssp. tuberosa (Paine) Wiersma & Hellquist [also reported as: Nymphaea tuberosa Paine]
- Magnoxigill 1919 (107) Indians of Maine
- Cornus sericea L. ssp. sericea [reported as: Cornus stolonifera Michx.]
- Mahaleb or Mahaleb cherry 1900-Present (3, 4, 5, 50, 109, 137, 138, 156, 158)
- Prunus mahaleb L.
- Mahintsh (Winnebago) 1919 (37)
- Asclepias syriaca L.
- Mahiz (Haiti) 1919 (107)
- Zea mays L.
- Mahogany or Mahogany tree 1785-1828 (7, 8)
- Gymnocladus dioicus (L.) K. Koch [reported as: Gymnocladus canadensis Lam.]
- Mahometan pea (China) 16th century (110) Bretschneider
- Pisum sativum L.
- Mahonia 1942 (155)
- Mahonia Nutt.
- Mahoushouda (Sanskrit) 1886 (110)
- Allium sativum L.
- Maiblume (German) 1900 (158)
- Convallaria majalis L.
- Maiden 1879 (46)
- Dianthus armeria L.
- Maiden blue-eyed Mary [Maiden blue eyed Mary] Present (50)
- Collinsia parviflora Lindl.
- Maiden cane [Maiden-cane] 1900-1913 (5, 158)
- Sorghum halepense (L.) Pers. [also reported as: Holcus halapensis L.]
- Maiden fern Present (50)
- Thelypteris Schmidel
- Maiden pink 1895-1923 (5, 15, 109, 138, 156)
- Dianthus deltoides L.
- Maidenhair 1900-1942 (138, 155, 158)
- Adiantum L.
- Maidenhair [Maiden hair]
- 1876-1900 (49, 92, 158)
- Adiantum capillus-veneris L.
- 1828-1917 (7, 19, 46, 49. 57, 157, 158)
- Adiantum pedatum L.
- 1893-1913 (5, 74, 76, 158) Brodhead WI, misapplied
- Geum rivale L
- 1986 (4)
- Geum triflorum Pursh
- Maidenhair fern [Maidenhair-fern, Maidenhair fern, Maiden-hair fern, Maiden hair fern]
- 1923-Present (1, 4, 50, 109, 138)
- Adiantum L. [also reported as: Adiantum (Tourn.) L.]
- 1879 (49)
- Adiantum capillus-veneris L.
- 1886-1986 (3, 4, 49, 72, 97, 102)
- Adiantum pedatum L.
- Maidenhair spleenwort [Maiden hair spleenwort, Maiden-hair spleanwort] 1899-Present (3, 4, 5, 50, 97, 109, 122, 131, 138, 155, 158)
- Asplenium trichomanes L.
- Maiden's-ruin 1900-1929 (157, 158)
- Artemisia abrotanum L.
- Maiden's-tears [Maiden's tears. Maidenstears] 1896-Present (5, 50, 76, 156)
- Silene vulgaris (Moench) Garcke [also reported as: Silene cucubalus Wibel, Silene latifolia (P. Mill.) Britton & Rendle]]
- Maid-of-the-mist [Maid of the mist] 1932 (1)
- Thalictrum L.
- Maid's-hair [Maids' hair, Maid's hair]
- 1900 (158)
- Galium aparine L.
- 1898-1923? (92, 156, 158) obsolete by 1923
- Galium verum L.
- Maid's-love 1900-1929 (157, 158)
- Artemisia abrotanum L.
- Maiglocken (German) 1900 (158)
- Convallaria majalis L.
- Mail-grass 1900 (158)
- Trifolium pratense L.
- Mails 1900-1929 (157, 158)
- Chenopodium album L.
- Maine's thorn 1913 (5)
- Crataegus pruinosa (Wendl.) K. Koch [reported as: Crataegus leiophylla Sargent]
- Ma??'gaműna't?g (Chippewa, wolf wood) 1928 (40)
- Symphoricarpos albus (L.) Blake
- Mais (French and German) 1900 (158)
- Zea mays L.
- Maise 1900-1929 (5, 156, 157, 158) obsolete by 1923
- Anthemis cotula L.
- Maithen 1807 (165)
- Anthemis cotula L.
- Maithes 1807 (165)
- Anthemis cotula L.
- Maiz 1492 (107) Columbus
- Zea mays L.
- Maize
- 1852-1942 (45, 155, 158, 163)
- Zea L.
- 1492-1970 (10, 66, 67, 68, 92, 106, 107, 109, 110, 119, 121, 138, 155, 158) Columbus, Mays: a name used by American aborigines
- Zea mays L.
- Maizim 1493 (107) Peter Martyr
- Zea mays L.
- Maka chiaka (Dakota) 1919 (37)
- Hedeoma hispida Pursh
- Maka ta omnicha or onmnicha (Dakota) 1919 (37)
- Amphicarpaea bracteata (L.) Fern. var. comosa (L.) Fern. [reported as: Falcata comosa (L.) Kuntze]
- Makacanšinhu (Lakota, skunk resin plant) 1918?-1970? (121)
- Lygodesmia juncea (Pursh) D. Don ex Hook.
- Makan bashahon-shon (Omaha-Ponca, crooked medicine) 1919 (37)
- Physalis hispida (Waterfall) Cronq. [reported as: Physalis lanceolata Michx., Physalis pumila Nutt. ssp. hispida (Waterfall) Hinton]
- Makan chahiwi-cho (Winnebago, blue medicine) 1919 (37)
- Gentiana puberulenta J. Pringle [reported as: Dasystephana puberula (Michx.) Small.]
- Makan saka (Omaha-Ponca, raw medicine) 1919 (37)
- Asclepias tuberosa L.
- Makan skithe (Omaha-Ponca, sweet medicine)
- 1919 (37)
- Humulus lupulus L. var. lupuloides E. Small
[reported as: Humulus americana Nutt. ]
- 1830 (37)
- Iris versicolor L.
- 1919 (37)
- Dalea purpurea Vent. var. purpurea [reported as: Petalostemum purpureum (Vent.) Rydb.]
- Makan-tanga (Omaha-Ponca, big medicine or root) 1919 (37)
- Silphium laciniatum L.
- Makan-wasek (Omaha-Ponca, strong medicine) 1919 (37)
- Mirabilis nyctaginea (Michx.) MacM. [reported as: Allionia nyctaginea Michx., Alliona nyctaginea Michx.]
- Makatomnica (Lakota, ground bean)
- 1918?-1970? (121)
- Amphicarpaea bracteata (L.) Fern.
- 1918?-1970? (121)
- Strophostyles helvula (L.) Ell. [reported as: Strophostyles helvola ]
- Makibûg (Chippewa) 1928 (40)
- Rhus glabra L.
- Ma'kodji'bik (Chippewa, bear root) 1928 (40)
- Smilax herbacea L.
- Ma'kwona'gic odji'bik (Chippewa, bear entrails root) 1928 (40)
- Apocynum androsaemifolium L.
- Mala indica 1552 (107) Tragus
- Cucurbita pepo L.
- Mala peruviana 1919 (107)
- Solanum lycopersicum L. var. lycopersicum [reported as: Lycopersicon esculentum P. Mill.]
- Malabar sprangletop Present (50)
- Leptochloa fusca (L.) Kunth
- Malachxil (Delaware) 1919 (107)
- Phaseolus vulgaris L.
- Male fern [Male-fern, Malefern]
- 1937 (122) TX
- Athyrium filix-femina (L.) Roth var. asplenoides (Michx.) Farw. [reported as: Athyrium asplenoides (Michx.) Desv.]
- 1932 (1)
- Dryopteris Adans.
- 1869-Present (4. 5, 49, 50, 52, 53, 54, 55. 57, 58, 60, 61, 92, 97, 109, 122, 131, 138, 155, 158)
- Dryopteris filix-mas (L.) Schott[also reported as: Aspidium filix mas ]
- 1876 (92)
- Osmunda regalis L.
- Male knotgrass [Male knot-grass] 1900 (158)
- Polygonum aviculare L.
- Male nervine
- 1828-1923 (7, 156)
- Cypripedium parviflorum Salisb. [reported as: Cypripedium luteum]
- 1900-1908 (64, 158)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill]
- Male shield fern [Male shield-fern] 1876-1913 (5, 92, 158)
- Dryopteris filix-mas (L.) Schott [also reported as: Aspidium filix mas ]
- Male Virginian dogwood 1785 (8)
- Cornus florida L.
- Malice 1893 (5, 74, 156, 158) Ferrisburgh VT, verbal corruption of mallows
- Malva rotundifolia L.
- Mallow [Mallows, Mallowes]
- 1818-Present (1, 4, 7, 10, 13, 15, 50, 82, 93, 106, 109, 138, 155, 156, 158)
- Malva L. [also reported as: Malva (Tourn.) L.]
- 1649-1900 (46, 107, 114, 157, 158) Neb accidentally introduced by 1671, Josselyn
- Malva rotundifolia L.
- 1840-1932 (19, 57, 85)
- Malva sylvestris L.
- Mallow-rose [Mallow rose] 1893-1923 (5, 74, 156, 158)
- Hibiscus moscheutos L.
- Mallow-wort [Mallow wort] 1876 (92)
- Callirhoe digitata Nutt.
- Malo mujer (Spanish) 1937 (122) TX
- Cnidoscolus texanus (Muell.-Arg.) Small
- Maltese-cross [Maltese cross, Maltesecross] 1876-Present (5, 50, 92, 109, 138, 156, 158)
- Lychnis chalcedonica L.
- Maltese-cross campion [Maltesecross campion 1942 (155)
- Lychnis chalcedonica L.
- Malum persicum 300BC (110) Theophrastus
- Prunus persica (L.) Batsch [reported as: Amygdalus persica L.]
- Malupwa (Crow) 1905 (101) MT
- Prunus virginiana L. var. demissa (Nutt.) Torr. [reported as: Prunus demissa (Nutt.) Walp.]
- Malus persica 1768 (165)
- Prunus persica (L.) Batsch [reported as: Amygdalus persica L.]
- Malva 1876-1917 (57, 92)
- Malva sylvestris L.
- Malvavisco (Spanish) 1900 (158)
- Althaea officinalis L.
- Mammal thistle 1882 (14)
- Mammillaria Haw.
- Mammillaria 1942 (155)
- Mammillaria Haw.
- Mammoth clover 1896-1923 (45, 138, 156, 158)
- Trifolium pratense L.
- Mammoth millet 1896 (45)
- Setaria italica (L.) Beauv.
- Mamoth clover 1913 (5)
- Trifolium pratense L.
- Ma'nanons (Chippewa) 1928 (40)
- Ostrya virginiana (P. Mill.) K. Koch [reported as: Ostrya virginiana (P. Mill.) Willd.]
- Man'asa'di (Chippewa) 1928 (40)
- Populus balsamifera L.
- Manazhiha-hi (Omaha-Ponca) 1919 (37)
- Urtica dioica L. ssp. gracilis (Aiton) Seland. [reported as: Urtica gracilis Aiton]
- Manchurian catalpa 1923 (138)
- Catalpa ovata G. Don [reported as: Catalpa bungei (Hort. ex Dippel)]
- Manda'min (Chippewa) 1820-1928 (40, 14, 37, 38)
- Zea mays L.
- Mande idhe shnaha (Omaha-Ponca, to make a bow smooth) 1830 (37)
- Equisetum L.
- Mandrake
- 1923 (156)
- Circaea lutetiana L.
- 1900-1936 (93, 158)
- Podophyllum L.
- 1671-1949 (2, 1, 6, 7, 13, 15, 46, 48, 49, 52, 53, 54, 55, 57, 58, 59, 64, 107, 109, 121, 125, 156, 157, 158) KS Josselyn
- Podophyllum peltatum L.
- Mandrake-pear [Mandrake pear 1893 (74) NJ
- Podophyllum peltatum L.
- Maned barley 1919 (107)
- Hordeum jubatum L.
- Mangummenauk (Narraganset) 1879 (46)
- Quercus alba L.
- Manido'bima'kwûd (Chippewa) 1928 (40)
- Parthenocissus quinquefolia (L.) Planch.
- Man-in-the-ground [Man in the ground] 1828-1876 (7, 92)
- Ipomoea pandurata (L.) G.F.W. Mey. [also reported as: Convolvulus panduratus]
- Manitoba maple 1923-1930 (106, 156) Western Canada
- Acer negundo L.
- Manna 1876 (92)
- Glyceria fluitans (L.) R. Br.
- Manna croup grass 1913 (5)
- Glyceria fluitans (L.) R. Br. [reported as: Panicularia fluitans (L.) Kuntze]
- Manna grass [Manna-grass, Mannagrass]
- 1896-Present (1, 45, 50, 66, 93, 152, 155)
- Glyceria R. Br. [also reported as: Panicularia Fabr.]
- 1876-1977 (3, 56, 92, 107)
- Glyceria fluitans (L.) R. Br.
- 1912-1932 (85, 152)
- Glyceria striata (Lam.) A.S. Hitchc. [also reported as: Glyceria nervata Trin., Panicularia nervata (Willd.) Kuntze]
- Manna seed 1876 (92)
- Glyceria fluitans (L.) R. Br.
- Man-of-the-earth [Man of the earth]
- 1870-1919 (77, 103, 107)
- Ipomoea leptophylla Torr.
- 1840-Present (2, 5, 19, 50, 57, 62, 92, 156, 158)
- Ipomoea pandurata (L.) G.F.W. Mey. [also reported as: Convolvulus panduratus Michx.]
- Mano'min or Man-om-in (Chipewa)
- 1871 (103)
- Zizania aquatica L.
- 1828-1928 (7, 40)
- Zizania palustris L.
- Manroot [Man root, Man-root]
- 1870-1919 (5, 86, 103, 107, 158)
- Ipomoea leptophylla Torr.
- 1876-1923 (5, 57, 92, 156, 158)
- Ipomoea pandurata (L.) G.F.W. Mey. [also reported as: Convolvulus panduratus]
- Man-saté (Chippewa, strange aspen) 1932 (105)
- Populus balsamifera L.
- Man's-health [Man's health] 1892 (6)
- Possibly, Panax quinquefolius L. [reported as: Aralia quinquefolia Gray]
- Mantil 1900 (158)
- Polygonum aviculare L.
- Manuska (Winnebago) 1830 (37)
- Hierochloe odorata (L.) Beauv. [reported as: Savastana odorata (L.) Scribn.]
- Many-awn prickly-leaf [Manyawn pricklyleaf]
- Present (50)
- Thymophylla aurea (Gray) Greene ex Britt.
- Present (50)
- Thymophylla aurea (Gray) Greene ex Britton var. aurea
- Many-branched pepperweed [Manybranched pepperweed] Present (50)
- Lepidium ramosissimum A. Nels.
- Many-flower agrimony [Many-flowered agrimony] 1899-1986 (3, 4, 5, 72, 97, 131)
- Agrimonia parviflora Aiton [also reported as: Agrimonia parviflora Soland (Possibly same species)]
- Many-flower aster [Manyflowered aster]
- 1913 (80) IA
- Symphyotrichum ericoides (L.) Nesom var. ericoides [reported as: Aster multiflorus Aiton]
- Present (50)
- Symphyotrichum ericoides (L.) Nesom var. pansum (Blake) Nesom
- Many-flower broomrape [Manyflower broomrape] Present (50)
- Orobanche ludoviciana Nutt. ssp. multiflora (Nutt.) Collins
- Many-flower flatsedge [Manyflower flatsedge] Present (50)
- Cyperus lancastriensis Porter ex Gray [reported as: Cyperus lancastriensis Porter]
- Many-flower monkey-flower [Manyflowered monkeyflower] Present (50)
- Mimulus floribundus Dougl. ex Lindl.
- Many-flower psoralea [Many-flowered psoralea] 1936-1937 (93, 97)
- Psoralidium tenuiflorum (Pursh) Rydb. [also reported as: Psoralea floribunda Nutt. ex Torr. & Gray]
- Many-flower rose [Many-flowering rose] 1910 (135) MT
- Rosa multiflora Thunb. ex Murray
- Many-flower stickseed [Manyflower stickseed] Present (50)
- Hackelia floribunda (Lehm.) I.M. Johnston
- Many-flowered darnel 1903 (66)
- Lolium perenne L. ssp. multiflorum (Lam.) Husnot [reported as: Lolium multiflorum Lam.]
- Many-fruit ludwigia [Many-fruited ludwigia] 1907-1913 (5, 72)
- Ludwigia polycarpa Short & Peter
- Many-fruit primrose-willow [Manyfruit primrose-willow] Present (50)
- Ludwigia polycarpa Short & Peter
- Many-hair paspalum [Many-haired paspalum] 1913 (5)
- Paspalum laeve Michx. [reported as: Paspalum plenipilum Nash]
- Many-head hymenopappus [Manyhead hymenopappus] Present (50)
- Hymenopappus filifolius Hook. var. polycephalus (Osterhout) B.L. Turner
- Many-head rush [Many-headed rush] 1977 (3)
- Juncus validus Coville var. validus [reported as: Juncus polycephalus Michx.]
- Many-head sedge [Manyhead sedge] Present (50)
- Carex sychnocephala Carey
- Many-ray aster [Many ray aster, Manyray aster, Many-rayed aster] 1913-Present (4, 5, 50, 97)
- Symphyotrichum anomalum (Engelm.) Nesom [also reported as: Aster anomalus Engelm.]
- Many-seed seedbox [Many-seeded seedbox] 1977-1986 (3, 4)
- Ludwigia polycarpa Short & Peter
- Many-spined opuntia 1913-1937 (5, 93, 97)
- Opuntia polyacantha Haw.
- Many-stalk bur-reed [Many-stalked bur-reed] 1913 (5)
- Sparganium angustifolium Michx. [reported as: Sparganium multipedunculatum (Morong) Rydb.]
- Many-stem pea [Manystem pea]
- Present (50)
- Lathyrus polymorphus Nutt.
- Present (50)
- Lathyrus polymorphus Nutt. ssp. polymorphus
- Present (50)
- Lathyrus polymorphus Nutt. ssp. polymorphus var. hapemanii (A. Nels.) A.S. Hitchc
- Present (50)
- Lathyrus polymorphus Nutt. ssp. polymorphus var. polymorphus
- Manzania 1898 (77) CA
- Mentha ×piperita L. [aquatica × spicata] [reported as: Mentha piperita L.]
- Manzanilla comun (Spanish) 1900 (158)
- Matricaria recutita L. [reported as: Matricaria chamomila L.]
- Manzanita 1930-Present (1, 50, 106, 155)
- Arctostaphylos Adans.
- Manzhonka-mantanaha (Omaha-Ponca) 1830 (37)
- Allium canadense L. var. mobilense (Regal) Ownbey [reported as: Allium mutabile Michx.]
- Maple 1785-Present (1, 4, 8, 10, 13, 15, 50, 82, 93, 106, 109, 156, 167)
- Acer L. [also reported as: Acer (Tourn.) L.]
- Maple sugar tree 1876 (92)
- Acer saccharinum L.
- Maple vine 1892 (6)
- Menispermum canadense L.
- Maple-ash [Maple ash] 1900-1923 (5, 156, 158)
- Acer negundo L.
- Maplebush [Maple bush] 1876 (92)
- Bellis perennis L.
- Maple-flower [Mapleflower] 1900 (158)
- Bellis perennis L.
- Maple-leaf goosefoot [Mapleleaf goosefoot, Maple-leaved goosefoot, Maple-leaved goose-foot] 1897-Present (3, 4, 21, 50, 62, 72, 80, 93, 95, 131, 145, 155, 156, 158)
- Chenopodium simplex (Torr.) Raf. [also reported as: Chenopodium gigantospermum Aellen, Chenopodium hybridum L.]
- Maple-leaf grape [Mapleleaf grape] 1828-Present (7, 50)
- Vitis acerifolia Raf.
- Maple-leaf mallow [Maple-leaved mallow] 1932 (1)
- Sphaeralcea St.-Hil. [reported as: Phymosia Desvar.]
- Maple-leaf pigweed [Maple-leaved pigweed] 1895-1900 (2, 158)
- Chenopodium simplex (Torr.) Raf. [also reported as: Chenopodium hybridum L.]
- Maple-leaved goosefoot 1932 (85) SD
- Chenopodium rubrum L.
- Maracock vine 1879 (46)
- Passiflora incarnata L.
- Marbleseed 1942-Present (50, 155)
- Onosmodium Michx.
- March 1876-1900 (92, 158) old name for parsley
- Petroselinum crispum (P. Mill.) Nyman ex A.W. Hill [also reported as: Apium petroselinum L.]
- March daisy 1913 (5)
- Bellis perennis L.
- Marcory 1828-1900 (6, 7, 92, 158) verbal corruption
- Stillingia sylvatica Garden ex L.
- Mardling
- 1900 (158)
- Lemna L.
- 1913 (5)
- Lemna minor L.
- Mare blebs 1892 (6)
- Caltha palustris L.
- Mare blobs 1892 (6)
- Caltha palustris L.
- Mare's-tail [Marestail, Mare's tail, Mare's-tails]
- 1895-1929 (2, 5, 45, 62, 125, 156, 157, 158)
- Conyza canadensis (L.) Cronq. var. canadensis [also reported as: Erigeron canadensis L., Leptilon canadense (L.) Britton]
- 1876-1913 (5, 92)
- Equisetum hyemale L.
- 1826-Present (1, 26, 50, 155, 158)
- Hippuris L.
- 1818-1986 (3, 4, 5, 10, 19, 85, 92, 93, 155, 156, 158) originally Female horse-tail
- Hippuris vulgaris L.
- 1900-1923? (5, 156, 158) obsolete by 1923
- Symphyotrichum ericoides (L.) Nesom var. ericoides [also reported as: Aster ericoides L.]
- Marg 1900-1929 (157, 158)
- Anthemis cotula L.
- Margaret 1900 (158)
- Bellis perennis L.
- Marginal shield fern [Marginal shield-fern] 1913-1986 (4, 5, 49, 53, 109)
- Dryopteris marginalis (L.) A. Gray
- Marginal wood fern [Marginal woodfern] Present (50)
- Dryopteris marginalis (L.) A. Gray
- Marginal-fruit shield fern [Marginal fruited shield fern, Marginal-fruited shield-fern] 1900-1908 (64, 158) Book name
- Dryopteris marginalis (L.) A. Gray
- Marguerite
- 1913 (5)
- Bellis perennis L.
- 1900-1986 (4, 107, 156, 158)
- Leucanthemum vulgare Lam. [also reported as: Chrysanthemum leucanthemum L.]
- Marguerite (French) 1900 (158)
- Bellis perennis L.
- Marienblatt (German) 1900 (158)
- Balsamita major Desf. [reported as: Chrysanthemum balsamita L.]
- Marigold [Marigolds]
- 1930 (106)
- Bidens L.
- 1907 (72) IA
- Caltha palustris L.
- 1930 (106)
- Gaillardia pulchella Foug.
- Marijuana [Marihuana]
- 1986 (4)
- Cannabis L.
- 1930-Present (3, 4, 50, 109, 125)
- Cannabis sativa L.
- Present (50)
- Cannabis sativa L. ssp. sativa
- Present (50)
- Cannabis sativa L. ssp. sativa var. sativa
- Marilandische Cassia (German) 1828 (7)
- Senna marilandica (L.) Link [reported as: Cassia marilandica L.]
- Marine ivy 1923 (156)
- Ampelopsis cordata Michx. [reported as: Cissus ampelopsis Pers.]
- Mariola 1913-Present (4, 50, 153) NM
- Parthenium incanum Kunth
- Mariposa or Mariposa lily [Mariposa lilies, Mariposa-lily, Mariposalily] Spanish for butterfly
- 1886-Present (1, 50, 75, 93, 101, 109, 155, 158)
- Calochortus Pursh.
- 1932 (85) SD
- Calochortus gunnisonii S. Wats.
- 1894-1977 (3, 75, 85, 127, 157)
- Calochortus nuttallii Torr. & Gray
- Mariposa-tulip [Mariposatulip] 1942 (155)
- Calochortus Pursh.
- Marish-isha (Crow) 1905 (101) MT
- Shepherdia argentea (Pursh) Nutt.
- Markry
- 1913 (5)
- Toxicodendron radicans (L.) Kuntze
- 1892-1923 (73, 76, 156) NH, ME
- Toxicodendron toxicarium (Salisb.) Gillis
[also reported as: Rhus toxicodendron L.]
- Markweed [Mark weed, Mark-weed]
- 1913 (5)
- Toxicodendron radicans (L.) Kuntze
- 1892-1923 (73, 156) Kennebec Co ME
- Toxicodendron toxicarium (Salisb.) Gillis [also reported as: Rhus toxicodendron L.]
- Marl-grass [Marl grass] 1876-1923? (5, 92, 156, 157, 158) obsolete by 1923
- Trifolium pratense L.
- Marronier d'inde (French) 1785 (8)
- Aesculus L.
- Marrow 1919 (107)
- Cucurbita maxima Dcne.
- Marrube 1903-1923? (5, 69, 156) obsolete by 1923
- Marrubium vulgare L.
- Marrube blanc (French) 1900 (158)
- Marrubium vulgare L.
- Marrubia (Spanish) 1900 (158)
- Marrubium vulgare L.
- Marrubium 1911 (59)
- Marrubium vulgare L.
- Marsh arrowgrass [Marsh arrow-grass]
- 1923 (156)
- Triglochin maritimum L. [reported as: Triglochin maritima L.]
- 1899-Present (5, 50, 66, 85, 93, 131)
- Triglochin palustre L.
- Marsh bellflower [Marsh belleflower] 1900-Present (3, 4, 5, 50, 72, 93, 95, 155, 156)
- Campanula aparinoides Pursh [also reported as: Campanula uliginosa Rydb.]
- Marsh bellwort 1899 (131) SD
- Campanula aparinoides Pursh
- Marsh bent grass [Marsh bent-grass] 1876-1938 (5, 92, 119)
- Agrostis gigantea Roth [also reported as: Agrostis alba L.]
- Marsh betony 1986 (4)
- Stachys pilosa Nutt. var. pilosa
- Marsh bristle grass [Marsh bristlegrass] Present (50)
- Setaria parviflora (Poir.) Kerguélen
- Marsh buttercup
- 1986 (4)
- Ranunculus hispidus Michx.
- 1900-1977 (3, 5, 72, 85, 93, 158)
- Ranunculus hispidus Michx.var. nitidus (Chapman) T. Duncan [also reported as: Ranunculus septentrionalis Poir.]
- Marsh clover 1892-1923 (5, 6, 92, 156, 158)
- Menyanthes trifoliata L.
- Marsh crowfoot 1892-1923 (5, 6, 156)
- Ranunculus sceleratus L.
- Marsh cudweed 1900-Present (5, 50, 156, 158)
- Gnaphalium uliginosum L.
- Marsh currant 1878 (108)
- Ribes lacustre (Pers.) Poir.
- Marsh cyperus 1913 (5)
- Cyperus pseudovegetus Steud.
- Marsh elder 1900-1923 (5, 156, 158)
- Viburnum opulus L.
- Marsh epilobium 1879-1922 (6, 49, 53)
- Epilobium palustre L.
- Marsh fern [Marshfern, Marsh-fern]
- 1879-1977 (3, 46)
- Thelypteris palustris Schott [also reported as: Aspidium thelypteris Swartz.]
- 1913-1949 (5, 109, 138, 155, 158)
- Thelypteris palustris Schott var. pubescens (Lawson) Fern. [also reported as: Dryopteris thelypteris (L.) A. Gray]
- Marsh fimbristylis 1913 (5)
- Fimbristylis castanea (Michx.) Vahl
- Marsh fimbry Present (50)
- Fimbristylis castanea (Michx.) Vahl
- Marsh flatsedge Present (50)
- Cyperus pseudovegetus Steud.
- Marsh fleabane
- 1930-1986 (1, 4, 106, 158)
- Pluchea Cass.
- Present (50)
- Senecio congestus (R.Br.) DC.
- Marsh fleawort 1900-1923 (5, 72, 156, 158)
- Senecio congestus (R.Br.) DC. [also reported as: Senecio palustris (L.) Hook.]
- Marsh foxtail [Marsh fox tail]
- 1932 (85) SD
- Alopecurus aequalis Sobol. var. aequalis [reported as: Alopecurus aristulatus Michx.]
- 1938 (119) OK
- Alopecurus carolinianus Walt.
- 1911-1977 (3, 5, 56)
- Alopecurus geniculatus L.
- Marsh gentian 1840-1898 (19, 49, 92)
- Gentiana alba Muhl. ex Nutt. [also reported as: Gentiana ochroleuca Willd. ]
- Marsh goldflower [Marsh gold-flower] 1878 (86)
- Caltha palustris L.
- Marsh grass [Marsh-grass, Marshgrass]
- 1884-1885 (87, 90)
- Distichlis spicata (L.) Greene [also reported as: Distichlis maritima Raf.]
- 1818-1936 (1, 7, 10, 45, 66, 93)
- Spartina Schreber [also reported as: Limnetis Richard]
- 1885-1932 (85, 90)
- Spartina gracilis Trin.
- Marsh grass-of-parnassus [Marsh grass of Parnassus]
- 1913-Present (5, 50, 156)
- Parnassia palustris L.
- Present (50)
- Parnassia palustris L. var. parviflora (DC.) Boivin
- Marsh groundsel 1900-1923 (156, 158)
- Senecio congestus (R.Br.) DC. [also reported as: Senecio palustris (L.) Hook.]
- Marsh hibiscus 1876 (92)
- Hibiscus moscheutos L. ssp. moscheutos [reported as: Hibiscus palustris L.]
- Marsh horsetail 1900-Present (4, 5, 50, 155, 158)
- Equisetum palustre L.
- Marsh mallow 1919-1923 (107, 156) misapplied
- Malva sylvestris L.
- Marsh marigold [Marsh marygold]
- 1893 (21)
- Bidens aristosa (Michx.) Britton [reported as: Bidens involucrata (Nutt.) Britton]
- 1840-1077 (1, 3, 5, 6, 14, 15, 19, 63, 85, 86, 92, 105, 107, 127, 131, 156, 157, 158) from Saxon merse mear-geallia "marsh-horse gold"
- Caltha palustris L.
- Marsh milkweed [Marsh milk weed, Marsh milk-weed] 1892-1923 (5, 64, 73, 75, 156, 158)
- Eupatorium purpureum L.
- Marsh muhlenbergia
- 1901 (56) IA
- Muhlenbergia glomerata (Willd.) Trin.
- 1913 (80) IA
- Muhlenbergia racemosa (Michx.) B.S.P.
- Marsh muhly 1944-Present (3, 50, 140)
- Muhlenbergia racemosa (Michx.) B.S.P.
- Marsh pea
- 1900 (158)
- Lathyrus L.
- 1840-Present (19, 50, 158)
- Lathyrus palustris L.
- Marsh peavine 1942 (155)
- Lathyrus palustris L.
- Marsh pennywort 1818-1932 (1, 10, 158)
- Hydrocotyle L.
- Marsh purslane [Marshpurslane]
- 1900-1932 (1, 158)
- Ludwigia L. [also reported as: Isnardia L.]
- 1899-1929 (5, 63, 72, 93, 97, 155, 156, 157, 158)
- Ludwigia palustris (L.) Ell. [also reported as: Isnardia palustris L.]
- Marsh ragwort 1899 (131) SD
- Senecio congestus (R.Br.) DC. [reported as: Senecio palustris (L.) Hook.]
- Marsh scorpion-grass [Marsh scorpion grass] 1900-1923 (5, 156, 158)
- Myosotis scorpioides L. [also reported as: Myosotis palustris (L.) Hill]
- Marsh seedbox 1986-Present (4, 50)
- Ludwigia palustris (L.) Ell.
- Marsh shield fern [Marsh shield-fern, Marsh shieldfern] 1913-1937 (5, 97, 122)
- Thelypteris palustris Schott var. pubescens (Lawson) Fern. [also reported as: Dryopteris thelypteris (L.) A. Gray]
- Marsh skullcap [Marsh skull cap, Marsh skull-cap] 1899-Present (3, 4, 5, 50, 72, 93, 131, 156, 157, 158)
- Scutellaria galericulata L.
- Marsh smartweed 1913-1930 (80, 82) IA
- Polygonum amphibium L. var. emersum Michx. [also reported as: Polygonum muhlenbergii Watson.]
- Marsh speedwell 1913-1986 (3, 4, 5, 155, 156)
- Veronica scutellata L. [also reported as: Veronica scutella L.]
- Marsh spike grass [Marsh-spike-grass] 1913-1938 (5, 119)
- Distichlis spicata (L.) Greene [also reported as: Distichlis stricta (Torr.) Rydb.]
- Marsh St. John's-wort [Marsh St. John's wort, Marsh St. Johnswort, Marsh St. Johnswort]
- 1849-1895 (2, 13)
- Hypericum L. [also reported as: Elodea Adans., Elodes]
- 1932-Present (1, 50, 93)
- Triadenum Raf.
- 1907-1986 (3, 4, 5, 72)
- Triadenum fraseri (Spach) Gleason [also reported as: Triadenum virginicum (L.) Raf.]
- Marsh straw sedge 1907 (72) IA
- Carex tenera Dewey
- Marsh trefoil
- 1932 (1)
- Menyanthes L. [reported as: Menyanthes (Tourn.) L.]
- 1818-1923 (5, 6, 7, 10, 49, 77, 92, 107, 156, 158) Western US
- Menyanthes trifoliata L. [also reported as: Menyanthes verna ]
- Marsh valerian 1942-Present (50, 155)
- Valeriana dioica L.
- Marsh vetchling 1899-1986 (3, 4, 5, 72, 131, 156, 158)
- Lathyrus palustris L.
- Marsh violet 1899-Present (5, 50, 92, 109, 131, 155, 156)
- Viola palustris L.
- Marsh water-cress [Marsh water cress] 1876-1929 (92, 131, 157, 158)
- Rorippa palustris (L.) Bess [also reported as: Nasturtium palustre DC]
- Marsh willow herb [Marsh willow-herb, Marsh willowherb] 1840-Present (5, 19, 50, 156, 158)
- Epilobium palustre L.
- Marshallia [Marshalia] 1923-1942 (138, 155)
- Marshallia Schreb.
- Marsh-beetle [Marsh beetle] 1900-1929 (5, 92, 156, 157, 158)
- Typha latifolia L.
- Marsh-cress [Marsh cress, Marshcress]
- 1932 (1)
- Rorippa Scop.
- 1895-1923 (2, 63, 72, 107, 156) IA
- Rorippa palustris (L.) Bess [also reported as: Nasturtium palustre DC]
- Marsh-elder [Marsh elder, Marshelder]
- 1895-Present (1, 2, 4, 50, 93, 156, 158)
- Iva L.
- 1893-1986 (4, 21, 125)
- Iva annua L.
- 1893-1930 (21, 125)
- Iva annua L. var. annua [also reported as: Iva ciliata Willd.]
- 1932 (85) SD
- Iva axillaris Pursh
- 1897-1986 (3, 4, 63, 80, 121, 126, 131, 145)
- Iva xanthifolia Nutt.
- Marshmallow [Marsh-mallow, Marsh mallow, Marsh mallows]
- 1768-Present (1, 50, 156, 165)
- Althaea L.
- 1649-1986 (3, 4, 5, 7, 19, 46, 58, 49, 52, 53, 55, 57, 92, 107, 109, 138, 155, 156, 158)
- Althaea officinalis L.
- 1932 (1)
- Hibiscus L.
- 1923 (156) misapplied
- Hibiscus moscheutos L.
- Marsh-marigold [Marsh marigold, Marshmarigold, Marsh mary-gold, Marsh marygold] 1814-Present (1, 4, 7, 10, 13, 15, 50, 93, 109, 155, 156, 158, 167)
- Caltha L. [also reported as: Caltha (Rupp.) L.]
- Marshpepper knotweed Present (50)
- Polygonum hydropiper L.
- Marsh-pepper smartweed [Marshpepper smartweed] 1942 (155)
- Polygonum hydropiper L.
- Marsh-pestle [Marsh pestle] 1913-1923 (5, 92, 156)
- Typha latifolia L.
- Marsh-pistle 1900-1929 (157, 158)
- Typha latifolia L.
- Marsh-reed [Marsh reed] 1900 (158)
- Equisetum palustre L.
- Marsh-sage 1923 (156)
- Eupatorium perfoliatum L.
- Marsh-turnip [Marsh turnip] 1830-1900 (37, 92, 158)
- Arisaema triphyllum (L.) Schott [also reported as: Arisaema triphyllum (L.) Torr., Arum triphyllum L.]
- Marshweed [Marsh weed] 1913 (5)
- Equisetum palustre L.
- Martagon de Canada 1619 (46) Io. Robin
- Lilium superbum L.
- Martha's Vineyard thorn 1913 (5)
- Crataegus crus-galli L. [reported as: Crataegus schizophylla Eggleston]
- Martinoe 1900-1923 (5, 156, 158)
- Proboscidea louisianica (P. Mill.) Thellung [also reported as: Martynia louisiana Miller]
- Martynia 1876-1923 (92, 107, 156)
- Proboscidea louisianica (P. Mill.) Thellung [also reported as: Martynia louisiana Miller, Martynia proboscidea Pursh, Martynia proboscides Gloxin]
- Marube fétide (French) 1900 (158)
- Ballota nigra L.
- Marube noir (French) 1900 (158)
- Ballota nigra L.
- Marvel 1900-1923? (5, 69, 156, 158) obsolete by 1923, verbal corruption
- Marrubium vulgare L.
- Marvel-of-Peru [Marvel of Peru] 1856 (147)
- Mirabilis L.
- Mary-buds 1900-1929 (157, 158) Shakespeare
- Ranunculus acris L.
- Maryland dittany 1895-1949 (2, 109, 155)
- Cunila origanoides (L.) Britton [also reported as: Cunila mariana L.]
- Maryland figwort [Maryland fig-wort] 1899-9177 (3, 5, 72, 97, 131, 155, 157, 158)
- Scrophularia marilandica L. [also reported as: Scrophularia marylandica L.]
- Maryland heal-all 1913 (5)
- Scrophularia marilandica L. [reported as: Scrophularia marylandica L.]
- Maryland meadow-beauty [Maryland meadow beauty, Maryland meadowbeauty]
- 1913-1937 (5, 50, 97, 138, 156)
- Rhexia mariana L.
- Present (50)
- Rhexia mariana L. var. interior (Pennell) Kral & Bostick
- Maryland pilewort 1913 (5)
- Scrophularia marilandica L. [reported as: Scrophularia marylandica L.]
- Maryland sanicle Present (50)
- Sanicula marilandica L.
- Maryland senna 1986-Present (4, 50)
- Senna marilandica (L.) Link [also reported as: Cassia marilandica L.]
- Maryland spurge 1913 (5)
- Euphorbia corollata L.[reported as: Euphorbia marilandica Greene, Tithymalopsis marilandica, Tithymalopsis marylandica (Greene) Small.]
- Maryland stonemint 1942 (155)
- Cunila origanoides (L.) Britton
- Maryland tickclover 1942-1986 (4, 155)
- Desmodium marilandicum (L.) DC.
- Mashtincha-puté (Dakota, rabbitnose) 1919 (37)
- Shepherdia argentea (Pursh) Nutt. [reported as: Lepargyraea argentea (Nutt.) Greene]
- Masliebenblume (German) 1900 (158)
- Bellis perennis L.
- Massive-spike prairie clover [Massive spike prairie clover] 1986 (4)
- Dalea cylindriceps Barneby
- Masterwort [Master wort] 1828-1923 (5, 7, 49, 52, 61, 62, 92, 156, 158)
- Heracleum maximum Bartr. [also reported as: Heracleum lanatum Michx.]
- Mastich tree 1879 (46)
- Rhus copallinum L. [reported as: Rhus copallina L. ]
- Mat chaff flower 1986 (4)
- Alternanthera caracasana Kunth
- Mat grama 1937-1942 (122, 155)
- Bouteloua simplex Lag.
- Mat muhly 1942-Present (3, 50, 155)
- Muhlenbergia richardsonis (Trin.) Rydb.
[also reported as: Muhlenbergia squarrosa (Trin.) Rydb.]
- Mat prickly-phlox [Mat prickly phlox] Present (50)
- Leptodactylon caespitosum Nutt.
- Mat rock-spirea [Mat rockspirea] Present (50)
- Petrophyton caespitosum (Nutt.) Rydb.
- Mat rush [Mat-rush] 1913-1923 (5, 156)
- Schoenoplectus tabernaemontani (K.C. Gmel.) Palla [also reported as: Scirpus validus Vahl]
- Mat sandbur
- 1944-Present (50, 140)
- Cenchrus longispinus (Hack.) Fern.
- 1942 (155)
- Cenchrus spinifex Cav. [reported as: Cenchrus pauciflorus Benth.]
- Mat spurge 1977-1986 (3, 4)
- Chamaesyce stictospora (Engelm.) Small [also reported as: Euphorbia stictospora Engelm.]
- Mat vetch Present (50)
- Vicia americana Muhl. ex Willd. ssp. minor (Hook.) C.R. Gunn
- Matasbuck (Algic tribes) 1828 (7)
- Maianthemum G.H. Weber ex Wiggers [reported as: Styrandra Raf.]
- Matchweed 1939 (146) MT
- Gutierrezia sarothrae (Pursh) Britton & Rusby
- Mat-grass [Mat grass] 1930 (106)
- Phyla nodiflora (L.) Greene [reported as: Lippia nodiflora (L.) Michx.]
- Mather 1807-1923? (5, 156, 165) obsolete by 1923
- Anthemis cotula L.
- Mathes 1900-1929 (157, 158)
- Anthemis cotula L.
- Matricaire (French) 1900 (158)
- Tanacetum parthenium (L.) Schultz-Bip. [reported as: Chrysanthemum parthenium (L.) Pers.]
- Matricaria 1911 (55)
- Matricaria recutita L. [reported as: Matricaria chamomila L.]
- Matricaria Parthenium 1869 (58)
- Tanacetum parthenium (L.) Schultz-Bip. [reported as: Chrysanthemum parthenium (L.) Pers.]
- Matricary 1949 (109)
- Matricaria L.
- Matricary grape-fern 1899-Present (4, 50, 131, 155)
- Botrychium matricariifolium (A. Braun ex Dowell) A Braun ex Koch
- Matrimony vine [Matrimony-vine, Matrimonyvine]
- 1900-1949 (82, 93, 109, 156, 158)
- Lycium L.
- 1840-Present (1, 3, 5, 19, 50, 63, 72, 82, 85, 92, 93, 95, 106, 114, 148, 155, 156, 158)
- Lycium barbarum L. [also reported as: Lycium halimifolium P. Mill., Lycium vulgare Dunal]
- Mattara (Finland) 1879 (46)
- Galium boreale L.
- Matted bluet Present (50)
- Houstonia humifusa (Gray) Gray
- Matted grama Present (50)
- Bouteloua simplex Lag.
- Matted sandmat Present (50)
- Chamaesyce serpens (Kunth) Small
- Matted spike-rush [Matted spike rush] 1913-Present (5, 50)
- Eleocharis intermedia (Muhl.) Schult
- Matted wild buckwheat 1986 (4)
- Eriogonum tenellum Torr.
- Maudlin 1900 (158) possibly a verbal corruption of Magdeline
- Balsamita major Desf. [reported as: Chrysanthemum balsamita L.]
- Maudlin daisy [Maudlin-daisy] 1898-1923 (5, 49, 156, 158)
- Leucanthemum vulgare Lam. [also reported as: Chrysanthemum leucanthemum L.]
- Maudlinwort [Maudlin wort] 1876-1900 (92, 158)
- Leucanthemum vulgare Lam. [also reported as: Chrysanthemum leucanthemum L.]
- Maul 1913-1923? (5, 156) obsolete by 1923
- Malva sylvestris L.
- Mauve (French) 1900 (158)
- Malva sylvestris L.
- Mauve sauvage (French) 1900 (158)
- Malva sylvestris L.
- Mawroll 1900 (158) verbal corruption
- Marrubium vulgare L.
- Maximilian's sunflower [Maximillian's sun-flower, Maximilians sunflower] 1878-Present (3, 4, 5, 50, 72, 80, 82, 85, 86, 97, 122, 124, 131, 138, 155)
- Helianthus maximiliani Schrad. [also reported as: Helianthus maximilianii Schrad.]
- May blobs [May-blob] 1900-1929 (5, 156, 157) England
- Caltha palustris L.
- May Day tree 1923-1937 (112, 63, 106)
- Prunus L.
- May flower [Mayflower, May-flower] 1892-1913 (5, 73, 158)
- Claytonia virginica L.
- May gowan 1900-1913 (5, 158)
- Bellis perennis L.
- May grass [Maygrass]
- 1977 (3)
- Phalaris caroliniana Walt.
- 1913 (5)
- Poa annua L.
- May lily 1876-1913 (5, 49, 92, 158)
- Convallaria majalis L.
- May wort 1876 (92)
- Anthemis cotula L.
- May-apple [May apple, Mayapple]
- 1814-Present (50, 93, 138, 155, 156, 167)
- Podophyllum L.
- 1770-Present (1, 3, 4, 5, 6, 10, 13, 14, 15, 19, 41, 46, 48, 49, 50, 53, 54, 55, 57, 58, 59, 61, 63, 64, 65, 72, 92, 97, 105, 107, 109, 121, 122, 124, 125, 156, 157, 158)
- Podophyllum peltatum L.
- May-blossom [May blossoms] 1900-1913 (5, 158)
- Convallaria majalis L.
- Mayflower [May flower, May-flower]
- 1896-1923 (76, 156, 158) Burnside SD
- Anemone caroliniana Walt.
- 1900-1913 (5, 158)
- Anemone quinquefolia L.
- 1923 (156)
- Convallaria majalis L.
- Present (50)
- Maianthemum G.H. Weber ex Wiggers
- 1923 (156)
- Maianthemum canadense Desf.
- 1932 (1)
- Penstemon Schmidel [reported as: Penstemon (Mitchell) Schmidel.]
- 1879?-1923 (49, 156) misapplied
- Podophyllum peltatum L.
- 1913 (5)
- Pulsatilla patens (L.) P. Mill.
- 1892-1929 (6, 157, 158)
- Pulsatilla patens (L.) P. Mill. ssp. multifida (Pritz.) Zamels [also reported as: Anemone patens L. var. nuttalliana (DC.) Gray]
- 1896 (76) Auburndale MA
- Saxifraga L.
- 1893-1923 (5, 74, 156) Eastern MA
- Thalictrum thalictroides (L.) Eames & Boivin [also reported as: Anemonella thalictroides (L.) Spach, Syndesmon thalictroides (L.) Hoffmg.]
- Maypop [May pop, May-pop, May pops, Maypops] 1876-1986 (3, 4, 5, 49, 53, 92, 106, 107, 109, 122, 124, 138, 156)
- Passiflora incarnata L.
- Maypop passion-flower [Maypop passionflower] 1942 (155)
- Passiflora incarnata L.
- May-rose [May rose] 1900-1923? (5, 156, 158) obsolete by 1923
- Viburnum opulus L.
- Mayweed [May weed, May-weed]
- 1814-1936 (1, 10, 61, 93, 167)
- Anthemis L. [also reported as: Anthemis (Michx.) L., Maruta Cass.]
- 1617-1937 (5, 7, 10, 19, 46, 47, 49, 57, 58, 62, 63, 72, 80, 82, 92, 93, 106, 122, 131, 156, 157, 158) accidentally introduced by 1671, Josselyn
- Anthemis cotula L. [also reported as: Maruta cotula (L.) DC.]
- 1942-Present (50, 155)
- Matricaria L.
- 1900 (158)
- Matricaria recutita L. [reported as: Matricaria chamomila L.]
- Present (50)
- Tripleurospermum Schultz-Bip.
- Mayweed chamomile [Mayweed camomile] 1942 (155)
- Anthemis cotula L.
- Ma'zana'tig (Chippewa) 1928 (40)
- Cirsium P. Mill. [reported as: Cirsium (Tourn.) Mill.]
- Mazorquilla (Spanish) 1900 (158)
- Phytolacca americana L. var. americana [reported as: Phytolacca decandraL.]
- McCalla's willow Present (50)
- Salix maccalliana Rowlee
- Mdo (Dakota) or Modo (Sioux) 1870-1919 (37, 103)
- Apios americana Medik. [also reported as: Apios tuberosa Moench, Glycine apios L.]
- Meadow anemone [Meadow anemony] 1923-1986 (3, 4, 109, 138, 155)
- Anemone canadensis L.
- Meadow barley 1913-Present (5, 50)
- Hordeum brachyantherum Nevski
- Meadow blue violet 1932 (85) SD
- Viola nephrophylla Greene [reported as: Viola papilionacea Pursh]
- Meadow brome Present (50)
- Bromus commutatus Schrad.
- Meadow buttercup [Meadow buttercups]
- 1893-1923 (5, 74, 156, 158) misapplied
- Caltha palustris L.
- 1900-1929 (5, 157, 158)
- Ranunculus acris L.
- 1900 (158)
- Ranunculus repens L.
- Meadow cat's-tail [Meadow cat's tail]
- 1840-1913 (5, 19, 68)
- Phleum pratense L.
- 1896 (45)
- Poa pratensis L. [reported as: Poa pratense L. ]
- Meadow chickweed 1913-1923 (5, 156)
- Cerastium arvense L.
- Meadow clover 1900-1929 (5, 93, 157, 158)
- Trifolium pratense L.
- Meadow comb grass 1901-1903 (56, 66)
- Eragrostis pectinacea (Michx.) Nees ex Steud.
- Meadow cranesbill 1923 (138)
- Geranium pratense L.
- Meadow cress 1828-1876 (7, 92)
- Cardamine bulbosa (Schreber. ex Muhl.) B.S.P.
[also reported as: Arabis rhomboides Michx. (Arabis rhomboidea Pers. )]
- Meadow death-camas [Meadow deathcamas] 1942-Present (50, 155)
- Zigadenus venenosus S. Wats.
- Meadow fern 1900 (158)
- Thelypteris palustris Schott var. pubescens (Lawson) Fern. [reported as: Dryopteris thelypteris (L.) A. Gray]
- Meadow fescue or Meadow fescue grass [Meadow fescue-grass] 1885-1977 (3, 5, 11, 45, 56, 66, 67, 68, 87, 90, 94, 109, 111, 119, 129, 138, 140, 143, 152, 155)
- Lolium pratense (Huds.) S.J. Darbyshire [also reported as: Festuca elatior L., Festuca elatior pratensis (Huds.) Hack., Festuca pratensis Huds.]
- Meadow flax Present (50)
- Linum pratense (Nort.) Small
- Meadow foxtail [Meadow fox tail, Meadow fox-tail] or Meadow foxtail grass [Meadow fox-tail grass] 1768-Present (3, 5, 45, 50, 56, 66, 67, 68, 87, 88, 90, 92, 94, 109, 129, 138, 143, 155, 165)
- Alopecurus pratensis L.
- Meadow garlic
- 1840-Present (19, 50, 72, 92, 93, 97, 138, 158)
- Allium canadense L.
- Present (50)
- Allium canadense L. var. canadense
- Present (50)
- Allium canadense L. var. lavendulare (Bates) M. Ownbey & Aase
- Present (50)
- Allium canadense L. var. mobilense (Regal) Ownbey
- Meadow geranium 1913 (5)
- Geranium pratense L.
- Meadow gowan [Meadow-gowan]
- 1932 (1)
- Caltha L. [reported as: Caltha (Rupp.) L.]
- 1923? (156, 157) obsolete by 1923
- Caltha palustris L.
- Meadow grass [Meadow-grass]
- 1840 (19)
- Alopecurus pratensis L.
- 1913-1938 (5, 119)
- Glyceria striata (Lam.) A.S. Hitchc. [also reported as: Panicularia nervata (Willd.) Kuntze]
- 1878-1932 (1, 45, 108, 152)
- Poa L.
- 1840-1895 (2, 5, 10, 19, 92)
- Poa pratensis L.
- 1932-1936 (1, 93) Neb
- Puccinellia Parl.
- Meadow holly [Meadow-holly] 1900-1837 (5, 97, 156, 158)
- Ilex crenata Thunb. [also reported as: Ilex decidua Walt.]
- Meadow horsetail
- 1977 (3)
- Equisetum palustre L.
- 1913-Present (3, 4, 5, 50, 155)
- Equisetum pratense Ehrh.
- Meadow lily
- 1894-1949 (5, 75, 109, 157, 158)
- Lilium canadense L.
- 1900 (158)
- Lilium superbum L.
- Meadow lousewort Present (50)
- Pedicularis crenulata Benth.
- Meadow oat grass 1884-1890 (68, 87, 88)
- Arrhenatherum elatius (L.) Beauv. ex J. Presl & C. Presl [also reported as: Arrhenatherum avenaceum Beauv.]
- Meadow pedicularis 1942 (155)
- Pedicularis crenulata Benth.
- Meadow pink 1913-1923 (5, 156)
- Dianthus deltoides L.
- Meadow plum
- 1840 (19)
- Prunus americana Marsh.
- 1840 (19)
- Prunus angustifolia Marsh. [reported as: Prunus chicasa Michx.]
- Meadow rattlesnake grass 1840 (19)
- Glyceria canadensis (Michx.) Trin. [reported as: Poa canadensis Michx.]
- Meadow rose 1899-1942 (5, 85, 93, 131, 138, 155, 158)
- Rosa blanda Aiton
- Meadow rue [Meadow-rue, Meadowrue]
- 1770-Present (1, 2, 4, 7, 10, 13, 15, 41, 50, 63, 82, 93, 109, 127, 138, 155, 156, 158, 167)
- Thalictrum L. [also reported as: Syndesmon Hoffmgg., Thalictrum (Tourn.) L.]
- 1919-1930 (37, 82)
- Thalictrum dasycarpum Fisch. & Avé-Lall.
- 1840-1876 (19, 92)
- Thalictrum dioicum L.
- 1886 (102)
- Thalictrum thalictroides (L.) Eames & Boivin [reported as: Thalictrum anemonoides Michx.]
- Meadow runagates [Meadow-runagates] 1900-1923 (156, 158)
- Lysimachia nummularia L.
- Meadow rye grass [Meadow ryegrass] Present (50)
- Lolium pratense (Huds.) S.J. Darbyshire
- Meadow sage
- 1876 (92)
- Salvia lyrata L.
- 1913-1923 (5, 138)
- Salvia pratensis L.
- Meadow salsify 1899-1986 (4, 5, 131, 155, 156, 158)
- Tragopogon pratensis L.
- Meadow scabish [Meadow-scabish] 1898-1923? (5, 49, 92, 156, 158) obsolete by 1923
- Symphyotrichum puniceum (L.) A.& D. Löve var. puniceum [also reported as: Aster puniceus L.]
- Meadow sedge
- 1907-1913 (5, 72) IA
- Carex granularis Muhl. ex Willd.
- 1977 (3)
- Carex granularis Muhl. var. granularis
- 1977 (3)
- Carex granularis Muhl. ex Willd. var. haleana (Olney) Porter
- Present (50)
- Carex praticola Rydb.
- Meadow soft grass
- 1903 (66)
- Holcus L.
- 1884-1913 (5, 45, 66, 87, 90)
- Holcus lanatus L. [also reported as: Nothoholcus lanatus (L.) Nash]
- Meadow spear grass [Meadow spear-grass] 1903-1938 (5, 66, 119)
- Glyceria striata (Lam.) A.S. Hitchc. [also reported as: Glyceria nervata Trin., Panicularia nervata (Willd.) Kuntze]
- Meadow spiraea 1923 (138)
- Spiraea alba Du Roi
- Meadow sunflower 1913 (80) IA
- Helianthus grosseserratus Martens
- Meadow sweet 1828 (7)
- Porteranthus stipulatus (Muhl. ex Willd.) Britt. [reported as: Gillenia stipulacea Nutt. ]
- Meadow tall dropseed 1942 (155)
- Sporobolus compositus (Poir.) Merr. var. drummondii (Trin.) Kartesz & Gandhi [reported as: Sporobolus asper (Michx.) Kunth var. pilosus (Vasey) Hitchc.]
- Meadow violet 1913-1977 (3, 5, 93, 97, 98)
- Viola nephrophylla Greene [also reported as: Viola papilionacea Pursh, Viola pratincola Greene]
- Meadow willow 1932-Present (3, 4, 50, 85)
- Salix petiolaris Sm.
- Meadow zizia Present (50)
- Zizia aptera (Gray) Fern.
- Meadow-beauty [Meadow beauty, Meadowbeauty] 1895-Present (1, 2, 4, 50, 122, 138, 155, 158)
- Rhexia L.
- Meadowbloom Meadow-bloom [Meadow bloom]
- 1828-1932 (6, 7)
- Ranunculus acris L.
- 1876-1900 (92, 158)
- Ranunculus bulbosus L.
- Meadowbouts 1828 (7)
- Caltha L. [reported as: Caltha (Rupp.) L.]
- Meadowbouts [Meadow bouts, Meadow-bouts] 1876-1929 (5, 92, 157)
- Caltha palustris L.
- Meadow-bright [Meadow bright] 1919 (107)
- Caltha palustris L.
- Meadow-parsnip [Meadow parsnip, Meadowparsnip]
- 1900-Present (1, 4, 50, 156, 158)
- Thaspium Nutt.
- 1911-1986 (4, 40, 85, 95) Neb SD
- Thaspium barbinode (Michx.) Nutt.
- 1932-1936 (1, 93) Neb
- Zizia W.D.J. Koch
- 1932-1977 (3, 85)
- Zizia aptera (Gray) Fern. [also reported as: Zizia cordata (Walt.) DC.]
- 1840-1876 (19, 92)
- Zizia aurea (L.) W.D.J. Koch
- Meadow-pink [Meadow pink] 1923 (156)
- Sabatia campestris Nutt.
- Meadowsweet [Meadow sweet, Meadow-sweet]
- 1814-1986 (1, 4, 82, 85, 156, 167)
- Spiraea L. [also reported as: Spiraea (Tourn.) L.]
- 1949-1977 (3, 109)
- Spiraea alba Du Roi
- Meadow-turnip [Meadow turnip] 1900-1908 (64, 158)
- Arisaema triphyllum (L.) Schott [also reported as: Arisaema triphyllum (L.) Torr., Arum triphyllum L.]
- Mead's milkweed 1907-Present (4, 5, 50, 72, 82)
- Asclepias meadii Torr. ex Gray
- Mead's sedge 1893-Present (3, 5, 50, 72)
- Carex meadii Dewey
- Meakin 1900-1923? (5, 156, 158) obsolete by 1923
- Myriophyllum spicatum L.
- Mealies 1900 (158) Australia, S. Africa
- Zea mays L.
- Meals 1900-1929 (156, 157, 158)
- Chenopodium album L.
- Mealy corydalis 1977-1986 (3, 4)
- Corydalis crystallina Engelm.
- Mealy fumewort Present (50)
- Corydalis crystallina Engelm.
- Mealy goosefoot
- 1913-Present (5, 50, 93, 97, 122)
- Chenopodium incanum (S. Wats.) Heller
- Present (50)
- Chenopodium incanum (S. Wats.) Heller var. incanum
- Means' grass [Means-grass, Means grass] 1885-1949 (45, 87, 88, 109, 158) Southern states, introduced by Gov. Means of SC in 1835
- Sorghum halepense (L.) Pers.
- Mecha-meck, Mechameck, Mech-a-meck, Mechamech 1828-1923 (5, 7, 46, 92, 156, 158) aboriginal name
- Ipomoea pandurata (L.) G.F.W. Mey.
- Mechameck bindweed 1828 (7)
- Ipomoea pandurata (L.) G.F.W. Mey. [reported as: Convolvulus panduratus]
- Mechoacan, Mechoacanna, or Mecoacan 1828-1900 (7, 19, 75, 92, 158)
- Ipomoea pandurata (L.) G.F.W. Mey. [also reported as: Convolvulus panduratus Michx.]
- Mechoacan 1898 (49)
- Phytolacca americana L. var. americana [reported as: Phytolacca decandraL.]
- Mediate spike-rush [Mediate spike rush] 1903-1907 (66, 72) IA
- Eleocharis intermedia (Muhl.) Schult
- Medica (Latin) 1886 (110) brought from Media about 470 BC, hence name
- Medicago sativa L.
- Medicai (Greek) 1886 (110)
- Medicago sativa L.
- Medick [Medic]
- 1818-1986 (1, 4, 10, 82, 109, 138, 155,156)
- Medicago L. [also reported as: Medicago (Tourn.) L.]
- 1876 (92)
- Medicago lupulina L.
- 1840-1898 (14, 19, 45, 118)
- Medicago sativa L.
- 1930 (82) IA
- Medicago sativa L. ssp. falcata (L.) Arcang. [reported as: Medicago sylvestris L., Medicago falcata L.
- Medick fitch 1900 (158)
- Onobrychis viciifolia Scop. [reported as: Onobrychis viciaefolia Scop.]
- Mediterranean love grass [Mediterranean lovegrass] 1942-1977 (3, 50, 155)
- Eragrostis barrelieri Daveau
- Mediterranean serpentroot 1942 (155)
- Scorzonera laciniata L.
- Medlars 187-1919 (46, 107)
- Diospyros virginiana L.
- Medsger's wild senna 1913-1937 (5, 97)
- Senna marilandica (L.) Link [also reported as: Cassia medsgeri Shafer]
- Meer-radys (Holland) 1886 (110)
- Armoracia rusticana P.G. Gaertn., B. Mey. & Scherb. [reported as: Cochlearia armoracia L.]
- Meerretig (German) 1886-1900 (110, 158)
- Armoracia rusticana P.G. Gaertn., B. Mey. & Scherb. [also reported as: Cochlearia armoracia L., Roripa armoracia (L.) A.S. Hitchc.]
- Meeting-houses [Meeting houses] 1900-1929 (5, 156, 157, 158)
- Aquilegia canadensis L.
- Meetin-seed 1923 (156)
- Foeniculum vulgare P. Mill.
- Megerkraut (German) 1900 (158)
- Galium verum L.
- Meg-many-feet 1900-1923 (156, 158)
- Ranunculus repens L.
- Meipen (Welsh) 1886 (110)
- Brassica rapa L.
- Mekminswan (Chippewa) 1932 (105)
- Campanula rotundifolia L.
- Melanthium 1900 (158) Greek
- Melanthium L.
- Melge 1900-1929 (157, 158)
- Chenopodium album L.
- Melic or Melic grass [Melic-grass, Melicgrass]
- 1770-Present (1, 10, 41, 50, 93, 152, 155)
- Melica L.
- 1840-1903 (19, 66, 87)
- Melica mutica Walt. [also reported as: Melica speciosa M.]
- 1915 (111) Neb
- Melica nitens (Scribn.) Nutt. ex Piper
- 1932-1977 (3, 85)
- Melica smithii (Porter Gray) Vasey
- Melilot
- 1923-1949 (82, 109, 156) IA
- Melilotus P. Mill. [also reported as: Melilotus (Tourn.) Hill.]
- 1882-1919 (6, 14, 92, 107)
- Melilotus officinalis (L.) Lam. [also reported as: Melilotus officinalis Willd., Melilotus alba Lam. (possibly same species)]
- Melilot (French) 1892 (6)
- Melilotus officinalis (L.) Lam. [reported as: Melilotus officinalis Willd.]
- Mélilot officinal (French) 1900 (158)
- Melilotus officinalis (L.) Lam.
- Melilot trefoil 1876-1913 (5, 92, 158)
- Medicago lupulina L.
- Melilotenklee (German) 1892-1900 (6, 158)
- Melilotus officinalis (L.) Lam. [also reported as: Melilotus officinalis Willd.]
- Meliloto (Spanish) 1900 (158)
- Melilotus officinalis (L.) Lam.
- Melilotus 1917 (57)
- Melilotus officinalis (L.) Lam.
- Melilotus capsulis reni similibus in capitulum congestis 1694 (46) Tournefort
- Medicago lupulina L.
- Melist 1919 (107)
- Melilotus officinalis (L.) Lam.
- Mellilot clover
- 1828 (7)
- Melilotus P. Mill. [reported as: Melilotus (Tourn.) Hill.]
- 1876 (92)
- Melilotus officinalis (L.) Lam. [reported as: Melilotus officinalis Willd.]
- Mellone (Italy) 1919 (107)
- Cucumis melo L.
- Melo 77AD (107) Pliny
- Cucumis melo L.
- Melocoton duranzo (Spanish) 1900 (158)
- Prunus persica (L.) Batsch [reported as: Amygdalus persica L.]
- Melon [Melons]
- 1923-Present (50, 138)
- Cucumis L.
- 1876-1949 (92, 106, 107, 109, 110, 138) Possibly introduced into America by Columbus
- Cucumis melo L.
- Melon pumpkin 1911 (55)
- Cucurbita maxima Dcne.
- Melon thistle 1818 (10)
- Opuntia P. Mill. [reported as: Cactus L.]
- Melone 1617 (107) Durante
- Cucumis melo L.
- Melone (Italy) 1919 (107)
- Cucumis melo L.
- Melones sive pepones 1561 (107) Pinaeus
- Cucumis melo L.
- Meloni (Sardinia) 1919 (107)
- Cucumis melo L.
- Melon-leaf nightshade [Melon-leaved nightshade] 1913-1986 (4, 5)
- Solanum citrullifolium A. Br.
- Melonsilla (Mexican, little melon) 1894 (150) NM
- Malvella leprosa (Ortega) Krapov [reported as: Sida hederacea Torr.]
- Melopepo 1919 (107) Latin
- Cucumis melo L.
- Melopepo clypeatus (summer squash) 1673 (107) Pancovius
- Cucurbita pepo L.
- Melopepon 150AD (107) Galen
- Cucumis melo L.
- Melothria Present (50)
- Melothria L.
- Memory root 1892-1898 (6, 78)
- Arisaema triphyllum (L.) Schott [also reported as: Arisaema triphyllum (L.) Torr., Arum triphyllum L.]
- Menagwake-minš (Chippewa, fragrant root tree) 1932 (105)
- Sassafras albidum (Nutt.) Nees [reported as: Sassafras variifolium (Salisb.) Kuntze]
- Menisperme (French) 1785 (8)
- Menispermum L.
- Ménisperme de Caroline (French) 1785 (8)
- Cocculus carolinus (L.) DC. [reported as: Menispermum carolinum]
- Ménisperme du Canada [Ménisperme de Canada] (French) 1785-1900 (8, 158)
- Menispermum canadense L.
- Menispermum 1908-1917 (57, 64)
- Menispermum canadense L.
- Mentha 1919 (52)
- Mentha piperita L.
[aquatica × spicata]
- Menthe (French) 1900 (158)
- Mentha L.
- Menthe des chats (French) 1900 (158)
- Nepeta cataria L.
- Menthe Poivree (French) 1892 (6)
- Mentha piperita L.
[aquatica × spicata]
- Menthe romaine (French) 1900 (158)
- Mentha spicata L.
- Menthe vert (French) 1900 (158)
- Mentha spicata L.
- Menthe-coq (French) 1900 (158)
- Balsamita major Desf. [reported as: Chrysanthemum balsamita L.]
- Mentzelia
- 1936-1942 (93, 148, 155) for Christian Mentzel, 1622-1701, German botanist
- Mentzelia L.
- 1933 (127) ND
- Mentzelia decapetala (Pursh ex Sims) Urban & Gilg ex Gilg
- Menyanthe (French) 1900 (158)
- Menyanthes trifoliata L.
- Menyanthe trefle (French) 1892 (6)
- Menyanthes trifoliata L.
- Menyanthe trefle d'eau (French) 1828 (7)
- Menyanthes trifoliata L. [reported as: Menyanthes verna )]
- Menyanthes 1917 (57)
- Menyanthes trifoliata L.
- Menzies' campion
- Present (50)
- Silene menziesii Hook.
- Present (50)
- Silene menziesii Hook. ssp. menziesii
- Present (50)
- Silene menziesii Hook. ssp. menziesii var. menziesii
- Menzies' fiddleneck Present (50)
- Amsinckia menziesii (Lehm.) A. Nels. & J.F. Macbr.
- Menzies' pink 1913 (5)
- Silene menziesii Hook.
- Menzies' rattlesnake-plantain [Menzies' rattlesnake plantain] 1913 (5)
- Goodyera oblongifolia Raf. [reported as: Peramium decipiens (Hook.) Piper]
- Menzies' silene [Menzies silene] 1942 (155)
- Silene menziesii Hook.
- Mercurialis tricoccos hermaphroditica 1768 (165) Plukenet
- Acalypha virginica L.
- Mercury
- 1870 (61) termed the mercury of Eclectic practice
- Iris versicolor L.
- 1913 (5)
- Toxicodendron radicans (L.) Kuntze
- 1892-1923 (6, 73, 76, 156) NH; Hartford ME
- Toxicodendron toxicarium (Salisb.) Gillis [also reported as: Rhus toxicodendron L.]
- Mercury-weed [Mercury weed] 1828-1929 (5, 7, 92, 156, 157, 158)
- Acalypha virginica L. [also reported as: Acalypha virginiana ]
- Mérédi or méridi (Italian Swiss, sea-radish) 1886 (110)
- Armoracia rusticana P.G. Gaertn., B. Mey. & Scherb. [reported as: Cochlearia armoracia L.]
- Merry-bells [Merrybells, Merry bells] 1923-1942 (138, 155, 156)
- Uvularia L.
- Mesa dropseed 1937-Present (3, 50, 122, 155)
- Sporobolus flexuosus (Thurb. ex Vasey) Rydb.
- Me'skwana'kûk bû'giso'win (Chippewa, swimming) 1928 (40)
- Eupatorium maculatum L.
- Meskwi-jibik (Chippewa, blood root) 1932 (105)
- Sanguinaria canadensis L.
- Mespila 1919 (107)
- Diospyros virginiana L.
- Mespilorum 1919 (107) LeMoyne
- Diospyros virginiana L.
- Mespilus 1785 (8)
- Crataegus L.
- Mespilus inermis foliis oblongis integris acuminata serratis parvis utrinque viridibus 1738 (46) Gronovius
- Crataegus viridis L.
- Mesquit, Mesquite, or Mezquit 1856-1977 (3, 65, 76, 103, 123, 125, 147)
- Prosopis glandulosa Torr. [also reported as: Algarobia glandulosa]
- Mesquit grass, Mesquite, or Mesquite grass [Mesquite-grass, Mezquite grass, Mezquit grass]
- 1884-1936 (1, 67, 87, 93)
- Bouteloua Lag.
- 1894-1958 (22, 116, 118, 129)
- Bouteloua curtipendula (Michx) Torr. [also reported as: Bouteloua racemosa L.]
- 1913 (5)
- Bouteloua curtipendula (Michx.) Torr. var. curtipendula [reported as: Atheropogon curtipendulus (Michx.) Fourn.]
- 1844-1938 (5, 30, 45, 56, 66, 87, 88, 99, 118, 119, 151)
- Bouteloua gracilis (Willd. ex Kunth) Lag. ex Griffiths [also reported as: Bouteloua oligostachya (Nutt.) Torr.]
- 1876 (92)
- Bouteloua hirsuta Lag.
- 1852 (163)
- Bouteloua rigidiseta (Steud.) Hitchc.
- 1884-1913 (5, 87)
- Buchloe dactyloides (Nutt.) Engelm. [reported as: Bulbilis dactyloides (Nutt.) Raf.]
- 1852-1912 (152, 163)
- Muhlenbergia porteri Scribn. ex Beal
- Meurier 1770 (41)
- Morus L.
- Mewzie's larkspur 1899 (131) SD
- Delphinium bicolor Nutt.
- Mexican banana 1900 (158)
- Yucca baccata Torr.
- Mexican bent grass [Mexican bent-grass] 1768 (165)
- Muhlenbergia mexicana (L.) Trin. [reported as: Agrostis mexicana L.]
- Mexican corn 1901 (56) IA
- Zea mays L.
- Mexican devilweed [Mexican devil-weed] 1986 (4)
- Chloracantha spinosa (Benth.) Nesom [reported as: Aster spinosus Benth.]
- Mexican dock 1942-Present (50, 155)
- Rumex salicifolius Weinm. var. mexicanus (Meisn.) A.S. Hitchc. [also reported as: Rumex mexicanus Meisn.]
- Mexican dropseed [Mexican drop-seed] or Mexican drop-seed grass 1901-1938 (56, 80, 94, 119)
- Muhlenbergia mexicana (L.) Trin.
- Mexican elder 1913-1942 (153, 155)
- Sambucus nigra L. ssp. canadensis (L.) R. Bolli [also reported as: Sambucus mexicana K. Presl ex DC.]
- Mexican eragrostis 1901 (56) IA
- Eragrostis mexicana (Hornem.) Link ssp. mexicana [reported as: Eragrostis mexicana Link]
- Mexican evening-primrose [Mexican evening primrose]
- 1937 (124) TX
- Oenothera laciniata Hill
- 1949 (109)
- Oenothera speciosa Nutt. [reported as: Oenothera speciosa Nutt. var. childsii Munz]
- Mexican fire bush 1986 (4)
- Kochia scoparia (L.) Schrad. [reported as: Kochia scoparia (L.) Roth]
- Mexican fire-plant 1923-1949 (109, 156)
- Euphorbia cyathophora Murray
- Mexican ground-cherry [Mexican ground cherry]
- Present (50)
- Physalis philadelphica Lam.
- 1913-Present (5, 50, 97, 122, 124, 156)
- Physalis philadelphica Lam. var. immaculata Waterfall [also reported as: Physalis ixocarpa Brot.]
- Mexican ground-plum [Mexican ground plum] 1937 (124) TX
- Astragalus crassicarpus Nutt. var. berlandieri Barneby [reported as: Astragalus mexicanus A. DC.]
- Mexican heliotrope 1898 (77) TX
- Phyla cuneifolia (Torr.) Greene [reported as: Lippia cuneifolia Steud]
- Mexican lavender 1930-1937 (106, 124)
- Vitex agnus-castus L.
- Mexican lobelia 1923-1942 (138, 155)
- Lobelia cardinalis L. [also reported as: Lobelia fulgens Humb. & Bonpl. ex Willd.]
- Mexican love grass [Mexican love-grass, Mexican lovegrass] 1937-Present (50, 122, 155)
- Eragrostis mexicana (Hornem.) Link ssp. mexicana [also reported as: Eragrostis mexicana Link]
- Mexican morning-glory 1923 (138)
- Ipomoea purpurea (L.) Roth [reported as: Ipomoea hirsutula]
- Mexican mosquito-fern [Mexican mosquitofern] Present (50)
- Azolla mexicana Schlecht. & Cham. ex K. Presl
- Mexican mud-plantain [Mexican mudplantain] Present (50)
- Heteranthera mexicana S. Wats.
- Mexican mugwort 1913-1937 (5, 97, 122)
- Artemisia ludoviciana Nutt. ssp. mexicana (Willd. ex Spreng.) Keck [also reported as: Artemisia mexicana Willd. ex Spreng.]
- Mexican muhlenbergia 1885-1903 (66, 90) ME
- Muhlenbergia mexicana (L.) Trin.
- Mexican muhly Present (50)
- Muhlenbergia mexicana (L.) Trin.
- Mexican panic grass [Mexican panicgrass] Present (50)
- Panicum hirticaule J. Presl.
- Mexican plum 1937-Present (50, 122, 155)
- Prunus mexicana S. Wats.
- Mexican sagebrush 1942 (155)
- Artemisia ludoviciana Nutt. ssp. mexicana (Willd. ex Spreng.) Keck [reported as: Artemisia mexicana Willd.]
- Mexican silk-tassel [Mexican silk tassel] 1986 (4)
- Garrya ovata Benth. ssp. goldmannii (Woot. & Standl.) Dahling
- Mexican spear grass 1901 (56) IA
- Eragrostis mexicana (Hornem.) Link ssp. mexicana [reported as: Eragrostis mexicana Link]
- Mexican tea
- 1828-Present (3, 4, 5, 7, 14, 50, 62, 69, 72, 80, 92, 93, 95, 97, 107, 125, 156, 157, 158)
- Chenopodium ambrosioides L.
- Present (50)
- Chenopodium ambrosioides L. var. ambrosioides
- 1986 (4)
- Ephedra L.
- Mexican wood grass 1894 (129) SD
- Muhlenbergia mexicana (L.) Trin.
- Mexican woodsia 1942 (155)
- Woodsia neomexicana Windham [reported as: Woodsia mexicana Fee ]
- Mexican-bamboo [Mexican bamboo] 1949-1986 (4, 109)
- Polygonum cuspidatum Sieb. & Zucc.
- Mexican-fireweed [Mexican fireweed] 1913-Present (50, 80)
- Kochia scoparia (L.) Schrad. [also reported as: Kochia scoparia (L.) Roth]
- Mexican-rose [Mexican rose] 1892 (5, 73, 156, 158) Chestertown MD
- Portulaca grandiflora Hook.
- Mexikanisches Traubenkraut (German) 1900 (158)
- Chenopodium ambrosioides L.
- Mezereon Present (50)
- Thymelaea passerina (L.) Coss. & Germ.
- Micapeca (Lakota) 1918-1970 (121)
- Hesperostipa spartea (Trin.) Barkworth [reported as: Stipa spartea Trin.]
- Micco hoyenejau (Creek) 1879 (46)
- Salix humilis Marsh. var. tristis (Aiton) Griggs [reported as: Salix tristis Aiton]
- Michaelmas daisy [[Michaelmas daisies]
- 1900-1923 (5, 156, 158) misapplied
- Symphyotrichum ericoides (L.) Nesom var. ericoides [also reported as: Aster ericoides L.]
- 1896-1900 (76, 158) Sulphur Grove OH, misapplied\
- Symphyotrichum novae-angliae (L.) Nesom [also reported as: Aster novae-angliae L.]
- Michaux's blue-eyed grass 1913 (5)
- Sisyrinchium mucronatum Michx.
- Michaux's cyperus 1907-1913 (5, 72) IA
- Cyperus odoratus L. [also reported as: Cyperus speciosus Vahl]
- Michaux's stitchwort Present (50)
- Minuartia michauxii (Fenzl) Farw.
- Michigan lily 1942-Present (50, 155)
- Lilium michiganense Farw.
- Michigan rose 1913-1923 (5, 156)
- Rosa setigera Michx.
- Michkidea (Crow) 1905 (101) MT, fruit
- Opuntia polyacantha Haw.
- Michkideamachwa (Crow) 1905 (101) MT
- Escobaria missouriensis (Sweet) D.R. Hunt var. missouriensis [reported as: Mammillaria missouriensis Sweet]
- Micidji'minaga'wûnj (Chippewa, fuzzy fruit) 1928 (40)
- Ribes L.
- Micocoulier 1785 (8)
- Celtis L. [reported as: Celtis (Tourn.) L.]
- Micocoulier à longues feuilles (French) 1857 (20)
- Celtis laevigata Willd. [reported as: Celtis longifolia Raf.]
- Micocoulier d'Occident (French) 1785 (8)
- Celtis occidentalis L.
- Micocoulier riticule (French) 1857 (20)
- Celtis laevigata Willd. [reported as: Celtis reticulata Torr.]
- Midland adder's-tongue [Midland adder's tongue, Midlands adder's-tongue] 1907-1937 (5, 72, 93, 97)
- Erythronium mesochoreum Knerr [also reported as: Erythronium mesachoreum Knerr]
- Midland fawn-lily [Midland fawnlily] Present (50)
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