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- Jabonera (Spanish) 1900 (158)
- Phytolacca americana L. var. americana [reported as: Phytolacca decandra L.]
- Jacea altera non ramosa tuberosa radice foliis latioribus flores ferens pauciores
majores (46)
- Liatris aspera Michx. [reported as: Liatris scariosa Willd.]
- Jachendel (German) 1900 (158)
- Juniperus communis L.
- Jack oak
- 1827-1923 (5, 33, 156)
- Quercus imbricaria Michx.
- 1900 (158)
- Quercus marilandica Muench [reported as: Quercus marylandica Muench]
- Jack pine 1894-Present (5, 50, 75, 109, 112, 136, 138, 155)
- Pinus banksiana Lamb.
- Jack-by-the-hedge
- 1876-1923? (5, 92, 156, 158) obsolete by 1923
- Alliaria petiolata (Bieb.) Cavara & Grande [also reported as: Alliaria alliaria (L.) Britton, Alliaria officinalis Andrz., Sisymbrium
alliaria ]
- 1900 (158)
- Tragopogon pratensis L.
- Jacket-and-breeches [Jacket and breeches] 1896 (76)
- Aquilegia canadensis L.
- Jack-go-to-bed-at-noon Present (50)
- Tragopogon pratensis L.
- Jack-in-the-bush 1913 (5)
- Alliaria petiolata (Bieb.) Cavara & Grande [reported as: Alliaria alliaria (L.) Britton]
- Jack-in-the-pulpit [Jack in the pulpit, Jackinthepulpit]
- 1932-Present (1, 50, 93, 155)
- Arisaema Martens
- 1806-Present (3, 5, 6, 35, 40, 49, 50, 53, 57, 58, 64, 73, 85, 86, 92, 93, 97, 122,
124, 125, 127, 138, 156, 157, 158) William Clark
- Arisaema triphyllum (L.) Schott [also reported as: Arisaema triphyllum (L.) Torr., Arum triphyllum L.]
- Jack-in-trousers 1896-1929? (5, 76, 156, 157, 158) Lynn MA, children's name
- Aquilegia canadensis L.
- Jack-jump-about 1900 (158)
- Lotus corniculatus L.
- Jack-of-the-buttery [Jack of the buttery] 1876 (92)
- Sedum acre L.
- Jack-over-the-ground 1892 (73) Eastern MA
- Glechoma hederacea L. [reported as: Nepeta glechoma Benth.]
- Jack's thorn 1913 (5)
- Crataegus chrysocarpa Ashe [reported as: Crataegus jackii Sargent]
- Jackson vine [Jackson-vine] 1892-1923 (5, 73, 156, 158) Mansfield OH, verbal corruption
- Lycium barbarum L. [also reported as: Lycium halimifolium P. Mill., Lycium vulgare Dunal]
- Jacksonville violet 1942 (155)
- Viola affinis Le Conte [reported as: Viola chalcosperma Brainerd]
- Jack-straws [Jack straws] 1900-1923 (5, 156, 158) obsolete by 1923
- Plantago lanceolata L.
- Jacobinia 1923 (138)
- Justicia L. [reported as: Jacobinia ]
- Jacob's -adder [Jacob's ladder] 1900-1923 (156, 158) misapplied
- Chelidonium majus L.
- Jacob's flower 1882-1913 (5, 14, 22, 40)
- Smilax herbacea L.
- Jacob's ladder [Jacob's-ladder]
- 1892-1913 (5, 73, 158) Stratham NH, misapplied
- Celastrus scandens L.
- 1892-1913 (5, 6, 73, 158) parts of NE US, misapplied
- Linaria vulgaris P. Mill. [also reported as: Linaria linaria (L.) Karst., Linaria vulgaris Hill]
- 1818-Present (1, 10, 50)
- Polemonium L. [also reported as: Polemonium (Tourn.) L.]
- 1870-1923 (49, 61, 86, 92, 156, 158) for ladder-like leaf, misapplied
- Polemonium reptans L.
- 1830-1882 (19, 37, 48, 92)
- Smilax herbacea L. [also reported as: Smilax peduncularis]
- Jacob's staff [Jacob's-staff] 1900-1923 (5, 69, 156, 158)
- Verbascum thapsus L.
- Jacob's sword [Jacob's-sword] 1900-1923 (5, 156, 158) obsolete by 1923
- Iris pseudacorus L.
- Jacobskraut (German) 1900 (158)
- Senecio vulgaris L.
- Jagged chickweed
- 1900 (158)
- Holosteum L.
- 1913-Present (4, 5, 50, 156)
- Holosteum umbellatum L.
- Jagged fleabane 1828 (7)
- Erigeron annuus (L.) Pers. [reported as: Erigeron heterophyllum]
- Jagong 1876 (92)
- Zea mays L.
- Jalap 1892-1898 (6, 71)
- Phytolacca americana L. var. americana [also reported as: Phytolacca decandra L.]
- Jalap cancer root 1898 (49)
- Phytolacca americana L. var. americana [reported as: Phytolacca decandra L.]
- James' beardtongue [James' beard-tongue] 1899-Present (50, 131)
- Penstemon jamesii A. Nels.
- James' boykinia [James boykinia] 1942 (155)
- Telesonix jamesii (Torr.) Raf. [reported as: Boykinia jamesii (Torr.) Engl.]
- James' bundleflower [James bundleflower] 1942 (155)
- Desmanthus cooleyi (Eat.) Trel.
- James' clammy-weed [James' clammyweed] Present (50)
- Polanisia jamesii (Torr. & Gray) Iltis
- James' cristatella 1907-1937 (5, 72, 97)
- Polanisia jamesii (Torr. & Gray) Iltis [also reported as: Cristatella jamesii Torr. & Gray]
- James' cryptantha [James cryptantha]
- Present (50)
- Cryptantha cinerea (Greene) Cronq.
- 1926-Present (3, 50, 98, 155)
- Cryptantha cinerea (Greene) Cronq. var. jamesii Cronq. [also reported as: Cryptantha jamesii (Torr.) Payson]
- James' dalea [James dalea] 1942-1986 (3, 4, 155)
- Dalea jamesii (Torr.) Torr. & Gray [also reported as: Dalea jamesi]
- James' eriogonum [James eriogonum] 1913-1942 (5, 97, 155)
- Eriogonum correllii Reveal [also reported as: Eriogonum jamesii Benth.]
- James' galleta Present (50)
- Pleuraphis jamesii Torr.
- James' hoffmannseggia [James' hoffmanseggia] 1913-1937 (5, 97)
- Caesalpinia jamesii (Torr. & Gray) Fisher [also reported as: Hoffmannseggia jamesii Torr. & Gray, Hoffamnseggia jamesii Torr. & Gray]
- James' holdback Present (50)
- Caesalpinia jamesii (Torr. & Gray) Fisher
- James' ironweed [James' iron-weed] 1913-1937 (5, 97)
- Vernonia marginata (Torr.) Raf.
- James' mimulus 1907 (72) IA
- Mimulus glabratus Kunth var. jamesii (Torr. & Gray ex Benth.) Gray [reported as: Mimulus jamesii Torr. & Gray.]
- James' monkey-flower [James' monkey flower, James' monkeyflower] 1878-Present (50, 86,
131)
- Mimulus glabratus Kunth var. jamesii (Torr. & Gray ex Benth.) Gray [also reported as: Mimulus jamesii Torr. & Gray.]
- James' nailwort [James nailwort] 1942-Present (4, 50, 155)
- Paronychia jamesii Torr. & Gray [also reported as: Paronychia jamesi
- James' parosela 1937 (97) OK
- Dalea jamesii (Torr.) Torr. & Gray [reported as: Parosela jamesii (Torr. & Gray) Vail ]
- James' penstemon [James penstemon] 1942 (155)
- Penstemon jamesii A. Nels.
- James' prairie clover Present (50)
- Dalea jamesii (Torr.) Torr. & Gray
- James rushpea [James rush-pea] 1986 (4)
- Caesalpinia jamesii (Torr. & Gray) Fisher
- James' saxifrage 1986 (4)
- Telesonix jamesii (Torr.) Raf.
- James' sedge 1893-Present (5, 50, 72)
- Carex jamesii Schwein.
- James' telesonix Present (50)
- Telesonix jamesii (Torr.) Raf.
- James weed 1805 (18)
- Datura stramonium L.
- James' whitlow-wort [James' whitlow wort] 1899 (5, 93, 97, 131)
- Paronychia jamesii Torr. & Gray
- James' wild buckwheat 1986 (4)
- Eriogonum correllii Reveal [reported as: Eriogonum jamesii Benth.]
- Jamestown weed [Jamestown-weed]
- 1818-1932 (1, 10)
- Datura L.
- 1870-1949 (5, 6, 49, 52, 53, 54, 59, 61, 69, 71, 92, 106, 109, 156, 157, 158)
- Datura stramonium L.
- Jamestown-lily [Jamestown lily] 1894-1913 (5, 69, 71, 75, 156, 158)
- Datura stramonium L. [also reported as: Datura tatula L.]
- Jano 1913 (153) NM
- Chilopsis linearis (Cav.) Sweet
- Japan clover 1884-1949 (5, 45, 66, 87, 97, 109, 158)
- Kummerowia striata (Thunb.) Schindl. [also reported as: Lespedeza striata (Thunb.) Hook. & Arn.]
- Japan honeysuckle 1923 (156)
- Lonicera japonica Thunb.
- Japan privet 1930 (106)
- Ligustrum L. [reported as: Lugustrum]
- Japan rose 1840 (19)
- Rosa multiflora Thunb. ex Murray
- Japanese bamboo 1986 (4)
- Polygonum cuspidatum Sieb. & Zucc.
- Japanese barberry 1923-Present (50, 82, 85, 109, 112, 138, 155)
- Berberis thunbergii DC.
- Japanese barnyard millet 1852-1949 (109, 163)
- Echinochloa frumentacea Link[also reported as: Echinochloa crus-galli var. edulis A.S. Hitchc., Echinochloa crus-galli (L.) Beauv.
var. frumentacea Wight]
- Japanese bristle grass [Japanese bristlegrass] Present (50)
- Setaria faberi Herrm.
- Japanese brome 1942-Present (3, 50, 140, 155)
- Bromus japonicus Thunb. ex Murr.
- Japanese catalpa 1923 (138)
- Catalpa ovata G. Don [reported as: Catalpa kaempferi (Siebold & Zucc.)]
- Japanese chess 1937-1944 (122, 140, 146)
- Bromus japonicus Thunb. ex Murr.
- Japanese clover 1977-Present (3, 50)
- Kummerowia striata (Thunb.) Schindl. [also reported as: Lespedeza striata (Thunb.) Hook. & Arn.]
- Japanese fleeceflower 1923-1942 (138, 155)
- Polygonum cuspidatum Sieb. & Zucc.
- Japanese foxtail Present (50)
- Setaria faberi Herrm.
- Japanese holly 1923-1949 (109, 138)
- Ilex crenata Thunb.
- Japanese honeysuckle 1913-Present (3, 4, 5, 50, 138, 155)
- Lonicera japonica Thunb.
- Japanese hop 1923-Present (3, 4, 50, 93, 138, 155)
- Humulus japonicus Sieb. & Zucc.
- Japanese knotweed 1913-Present (3, 5, 50, 109)
- Polygonum cuspidatum Sieb. & Zucc. [also reported as: Pleuropterus zuccarinii Small]
- Japanese lespedeza 1986 (4)
- Kummerowia striata (Thunb.) Schindl. [reported as: Lespedeza striata (Thunb.) Hook. & Arn.]
- Japanese millet
- 1923-1942 (1, 138, 155)
- Echinochloa frumentacea Link [also reported as: Echinochloa crusgalli edulis , Echinochloa crus-galli var. edulis A.S. Hitchc., Echinochloa crus-galli (L.) Beauv. var. frumentacea Wight]
- 1919 (107)
- Setaria italica (L.) Beauv.
- Japanese mustard 1942 (155)
- Brassica juncea (L.) Czern. [reported as: Brassica japonica Thunb.]
- Japanese raspberry 1942 (155)
- Rubus parviflorus Nutt.
- Japanese rose 1923-1986 (4, 138, 155)
- Rosa multiflora Thunb. ex Murray
- Japizapi hu (Lakota, mouth organ plant) 1918-1970 (121)
- Maianthemum racemosum (L.) Link ssp. racemosum [reported as: Smilacina racemosa (L.) Desf.]
- Jasmine 1892-1913 (5, 73) Mansfield OH
- Lycium barbarum L. [also reported as: Lycium halimifolium P. Mill., Lycium vulgare Dunal]
- Jasmine bindweed 1840 (19)
- Ipomoea quamoclit L.
- Jatropha 1919 (52)
- Solanum carolinense L.
- Jaundice-berry [Jaundice berry] 1876-1929 (5, 92, 107, 156, 157, 158)
- Berberis vulgaris L.
- Jaundice-tree [Jaundice tree] 1913-1923 (5, 156)
- Berberis vulgaris L.
- Java-bean Present (50)
- Senna obtusifolia (L.) Irwin & Barneby
- Jayweed [Jay-weed] 1900-1929 (157, 158)
- Anthemis cotula L.
- Jažopi hu (Lakota, whistle stem) 1918?-1970? (121)
- Sium suave Walt.
- Jeff Davis cholla [JeffDavis cholla] 1942 (155)
- Opuntia tunicata (Lehm.) Link & Otto var. davisii (Engelm. & Bigelow) L. Benson [reported as: Opuntia davisii Engelm. & Bigelow]
- Jenny wren [Jenny-wren] 1900-1929 (5, 156, 157, 158)
- Geranium robertianum L. [also reported as: Robertiella robertiana (L.) Hanks.]
- Jersey tea [Jersey-tea]
- 1828-1923 (7, 48, 92, 138, 157, 158)
- Ceanothus americanus L. [also reported as: Ceanothus officinalis Raf.]
- Present (50)
- Ceanothus herbaceus Raf.
- Jersey-tea ceanothus [Jerseytea ceanothus] 1942 (155)
- Ceanothus americanus L.
- Jerusalem artichoke [Jerusalemartichoke] 1686-Present (3, 5, 7, 14, 19, 37, 40, 50, 62,
63, 72, 82, 92, 93, 95, 97, 105, 107, 110, 122, 124, 127, 131, 138, 145, 155, 156, 158)
possibly a corruption of Girasole articocco, Italian for sunflower artichoke
- Helianthus tuberosus L.
- Jerusalem corn 1938 (119) OK
- Sorghum bicolor (L.) Moench ssp. bicolor [reported as: Sorghum vulgare Pers. var. durra (Forsk.) Hubbard & Rehd.]
- Jerusalem potato 1923 (156)
- Helianthus tuberosus L.
- Jerusalem star [Jerusalem-star] 1876-1913 (5, 92, 156, 158)
- Tragopogon porrifolius L.
- Jerusalem tea 1898-1929 (69, 92, 156, 157, 158)
- Chenopodium ambrosioides L.
- Jerusalem-apple [Jerusalem apple] 1835 (107)
- Solanum lycopersicum L. var. lycopersicum [reported as: Lycopersicon esculentum P. Mill.]
- Jerusalem-artichoke sunflower [Jerusalemartichoke sunflower] 1942 (155)
- Helianthus tuberosus L.
- Jerusalem-cross [Jerusalem cross] 1876-1900 (92, 158)
- Lychnis chalcedonica L.
- Jerusalem-oak [Jerusalem oak]
- 1770-1923 (6, 7, 41, 58, 92, 156, 158)
- Chenopodium ambrosioides L. var. ambrosioides [also reported as: Chenopodium anthelminticum L.]
- 1900-1977 (1, 3, 4, 72, 85, 122, 138, 156, 157, 158)
- Chenopodium botrys L.
- Jerusalem-oak goosefoot [Jerusalem oak goosefoot, Jerusalemoak goosefoot] 1942-Present
(50, 155)
- Chenopodium botrys L.
- Jerusalem-oak leaves [Jerusalem oak leaves] 1876 (92)
- Chenopodium ambrosioides L. var. ambrosioides [reported as: Chenopodium anthelminticum L.]
- Jerusalem-oak seed [Jerusalem oak seed] 1876 (92)
- Chenopodium ambrosioides L. var. ambrosioides [reported as: Chenopodium anthelminticum L.]
- Jerusalem-sage [Jerusalem sage]
- 1923-Present (50, 138, 156)
- Phlomis L.
- 1876-1913 (5, 92)
- Phlomis tuberosa L.
- Jessamine 1892 (73, 158) Stratham NH, misapplied
- Lycium barbarum L. [also reported as: Lycium vulgare Dunal]
- Jesuit tea 1900-1929 (69, 156, 157, 158) misapplied
- Chenopodium ambrosioides L.
- Jewelweed [Jewel weed, Jewel-weed]
- 1828-1932 (1, 2, 7, 13, 15, 106)
- Impatiens L.
- 1878-Present (5, 50, 86, 53, 156)
- Impatiens capensis Meerb. [also reported as: Impatiens biflora Walt., Impatiens fulva Nutt.]
- 1840-1986 (4, 5, 19, 53, 57, 92)
- Impatiens pallida Nutt.
- Jews' harp [Jews harp] or Jews-harp plant [Jewsharp plant, Jew's-harp plant]
- 1828-1923? (5, 7, 156, 158) obsolete by 1923
- Trillium cernuum L. [also reported as: Trillium latifolium]
- 1869 (58)
- Trillium sessile L.
- Jew's-ear [Jew's ear] 1900-1923 (5, 156, 158) misapplied
- Solanum lycopersicum L. var. lycopersicum [also reported as:Lycopersicon esculentum P. Mill., Lycopersicon lycopersicon (L.) Karst]
- Jiggerweed [Jigger weed] 1898 (77) Florida Keys
- Boerhavia erecta L.
- Jim Hill mustard 1923 (156)
- Sisymbrium altissimum L.
- Jim Hill weed 1923 (156)
- Thlaspi arvense L.
- Jimmyweed 1942 (155)
- Isocoma pluriflora (Torr. & Gray) Greene [reported as: Aplopappus fremonti , Haplopappus fremontii (Gray) Greene]
- Jimpson seed 1876 (92)
- Datura stramonium L.
- Jimpson weed 1892-1911 (49, 73, 95) Neb Western & Southern US
- Datura stramonium L.
- Jimsonweed [Jimson weed, Jimson-weed]
- 1923-Present (1, 50, 156)
- Datura L.
- 1892-Present (3, 4, 5, 6, 49, 50, 52, 53, 57, 59, 62, 63, 69, 71, 72, 73, 80, 85,
92, 97, 106, 109, 124, 125, 148, 156, 157) Western & Southern US, corruption of Jamestown
where presumably first introduced
- Datura stramonium L.
- Jimsonweed datura 1942 (155)
- Datura stramonium L.
- Jin chen 1892 (6)
- Possibly,Panax quinquefolius L. [reported as: Aralia quinquefolia Gray]
- Jin'gwakwan'dûg (Chippewa, pine) 1928 (40)
- Artemisia dracunculus L. [reported as: Artemisia dracunculoides Pursh]
- Jinshang 1900 (158) US
- Panax quinquefolius L. [reported as: Panax quinquefolium L.]
- Joan silver-pin [Joan silver pin] 1876 (92)
- Papaver rhoeas L.
- Job's tears [Job's-tears] 1894-1929? (5, 75, 156, 157, 158) NY, misapplied
- Maianthemum racemosum (L.) Link ssp. racemosum [also reported as: Smilacina racemosa (L.) Desf., Vagnera racemosa (L.) Morong.]
- Joemna (Sweden) 1879 (46)
- Lycopodium complanatum L.
- Joe-pye [Joe-Pye, Joe Pie, Joepye] or Joe-pye weed [Joe-Pye-weed, Joe Pye weed,
Jopi-weed, Joe pye's weed] Possibly a corruption of the native American name Jopi
- 1936 (93) Neb
- Eupatorium L. [reported as: Eupatorium (Tourn.) L.]
- 1929-1986 (4, 40, 109)
- Eupatorium maculatum L.
- 1828 (7)
- Eupatorium perfoliatum L.
- 1828-1949 (2, 5, 6, 7, 19, 49, 53, 58, 62, 63, 64, 72, 82, 92, 93, 95, 97,105,
106, 109, 122, 127, 138, 156)
- Eupatorium purpureum L. [also reported as: Eupatorium
verticillatum]
- Joe-the-weed 1929 (157)
- Eupatorium purpureum L.
- Johandel (German) 1900 (158)
- Juniperus communis L.
- Johannisblut (German) 1900 (158)
- Hypericum perforatum L.
- Johanniskraut (German) 1892-1900 (6, 158)
- Hypericum perforatum L.
- Johanniswurzel (German) 1900 (158)
- Dryopteris filix-mas (L.) Schott
- John-go-to-bed-at-noon
- 1900 (158)
- Anagallis arvensis L.
- 1900 (158)
- Ornithogalum umbellatum L.
- Johnnies 1892 (73) Mansfield OH
- Viola tricolor L.
- Johnny- jump [Johnny jump] 1894-1923 (5, 75, 156) Southern CA
- Dodecatheon meadia L.
- Johnny-jumper [Johnny jumper] 1876-1900 (92, 158)
- Viola tricolor L.
- Johnny-jump-up [Johhnyjumpup]
- 1942-1986 (3, 4, 155)
- Viola bicolor Pursh [also reported as: Viola kitaibeliana J.A. Schultes var. rafinesquei Fern., Viola rafinesquei Greene]
- 1913-1923 (5, 156)
- Viola palmata L.
- 1900-1923 (156, 158)
- Viola pedata L.
- 1892-Present (50, 73, 74, 158)
- Viola tricolor L.
- Johnny-smokers [Johnny smokers] 1893 (74) Rockford IL, fruits have conspicuous plumose
styles
- Geum triflorum Pursh
- John's-cabbage [John's cabbage] 1892 (6)
- Hydrophyllum virginianum L. [reported as: Hydrophyllum virginicum L.]
- Johnson grass [Johnson-grass, Johnsongrass]
- 1913 (5)
- Bromus catharticus Vahl [reported as: Bromus unioloides H.B.K.]
- 1936 (93) Neb
- Holcus L.
- 1894 (75) Neb
- Sorghum bicolor (L.) Moench [reported as: Andropogon sorghum Brot. Fl.]
- 1852-Present (5, 45, 50, 56, 72, 80, 85, 87, 88, 94, 109, 111, 119, 122, 129, 138,
140, 152, 155, 158, 163)
- Sorghum halepense (L.) Pers. [also reported as: Andropogon halepensis (L.) Brot. Fl., Andropogon sorghum Brot. var. halapensis Hack.,
Holcus halapensis L.]
- Johnston's knotweed Present (50)
- Polygonum douglasii Greene ssp. johnstonii (Munz) Hickman
- John's-wort [Johnswort, John's wort] 1876-1929? (5, 92, 157, 158)
- Hypericum perforatum L.
- Joint grass [Joint-grass] 1852-1938 (5, 66, 119, 151, 163)
- Paspalum distichum L.
- Joint-grass [Joint grass] 1919 (107)
- Equisetum fluviatile L.
- Jointed charlock
- 1932 (1)
- Raphanus L. [reported as: Raphanistrum (Tourn.) All.]
- 1892 (5, 6, 15, 80, 106, 107, 156)
- Raphanus raphanistrum L.
- Jointed goatgrass 1938-Present (50, 119, 155)
- Aegilops cylindrica Host
- Jointed rush
- 1913-1923 (5, 156)
- Juncus articulatus L.
- 1942-1944 (139, 155)
- Juncus nodusus L.
- Joint-fir [Joint fir, Jointfir]
- 1900-Present (50, 138, 155, 158)
- Ephedra L.
- 1900-1937 (124, 158)
- Ephedra antisyphilitica Berl. ex C.A. Mey.
- Joint-leaf rush [Jointleaf rush] Present (50)
- Juncus articulatus L.
- Joint-rush [Joint rush] 1830 (37)
- Equisetum L.
- Jointweed [Joint weed, Joint-weed]
- 1900-1923 (5, 93, 156, 158)
- Hippuris vulgaris L.
- 1937-1986 (4, 124)
- Polygonella americana (F & M) Small
- 1895 (2)
- Polygonum L.
- Jo'minaga'wûnj (Chippewa) 1928 (40)
- Vitis vulpina L. [reported as: Vitis cordifolia Michx.]
- Jones's fescue 1901 (94)
- Festuca subulata Trin. [reported as: Festuca jonesii Vasey]
- Joseph's flower 1900-1923 (5, 156, 158)
- Tragopogon pratensis L.
- Jove's fruit [Jove's-fruit] 1876-1923? (92, 156, 158) obsolete by 1923
- Diospyros virginiana L.
- Joy-leaf [Joy leaf] 1913-1923 (5, 156)
- Prenanthes alba L.[also reported as: Nabalus albus (L.) Hook.]
- Joy-of-the-ground 1923 (156)
- Vinca minor L.
- Joyweed Present (50)
- Alternanthera Forsk.
- Juba (Bengali) 1886 (110)
- Hordeum vulgare L. [reported as: Hordeum hexastichon L.]
- Juba's bush Present (50)
- Iresine rhizomatosa Standl.
- Juba's-bush bloodleaf [Jubasbush bloodleaf] 1942 (155)
- Iresine rhizomatosa Standl. [reported as: Iresine celosia L. - Rydberg]
- Jucato (Jamaica) 1828 (7)
- Phytolacca americana L. var. americana [reported as: Phytolacca decandra L.]
- Judas tree [Judas' tree, Judas-tree]
- 1785-1936 (1, 8, 93, 158, 167) Neb
- Cercis L.
- 1785-1930 (8, 10, 19, 58, 92, 95, 106, 107, 156)
- Cercis canadensis L.
- 1900 (158) miapplied
- Sambucus nigra L.
- Judée du Canada (French) 1785 (8)
- Cercis canadensis L.
- Judenkirschen (German) 1900 (158)
- Physalis alkekengi L.
- Judge Daly's sunflower 1913 (5)
- Helianthus maximiliani Schrad. [reported as: Helianthus dalyiBritton]
- Juglans alba fructu ovato compresso profunde insculpto durissimo cavitate intus minima
1738 (46) Gronovius
- Carya laciniosa (Michx. f.) G. Don [reported as: Carya sulcata Nutt., Hicoria laciniosa (Michx. f.) Sarg.]
- Jujube 1849-Present (13, 50, 109, 138, 155, 158)
- Ziziphus P.Mill
- Jumping cholla Present (50)
- Opuntia fulgida Engelm.
- Jumpseed [Jump-seed] 1923-Present (50, 156)
- Polygonum virginianum L. [also reported as: Tovaria virginica, Possibly Polygonum virginianum ]
- Jump-up-and-kiss-me-quick 1942 (155)
- Portulaca pilosa L.
- Juncus foliis articulosis floribus umbellatis (46)
- Juncus articulatus L.
- Juncus palustris humilior erectus etiam repens 1694 (46) Tournedofrt
- Juncus bufonius L.
- June bud 1923? (156) obsolete by 1923
- Cercis canadensis L.
- June flower, June-flower 1900-1923 (156, 158) Woodstock, N.B.; Houlton Me.
- Viola canadensis L.
- June grape 1895 (15)
- Vitis riparia Michx. [reported as: Vitis vulpina L. var. praecox Bailey]
- June grass [Junegrass, June grass]
- 1885-1894 (75, 90)
- Danthonia spicata (L.) Beauv. ex Roemer & J.A. Schultes
- 1912-Present (1, 50, 93, 152)
- Koeleria Pers.
- 1884-1977 (3, 45, 75, 85, 87, 98, 115, 116, 122, 134, 140, 146, 152)
- Koeleria macrantha (Ledeb.) J.A. Schultes [also reported as: Koeleria cristata (L.) Pers., Koeleria pyramidata (Lam.) Beauv., Possibly Koeleria macrantha]
- 1901 (56) IA
- Poa compressa L.
- 1852-1949 (2, 45, 56, 66, 67, 87, 88, 90, 92, 109, 125, 134, 143, 163)
- Poa pratensis L.
- June river-bank grape [June riverbank grape] 1942 (155)
- Vitis riparia Michx. [reported as: Vitis riparia Michx. var. praecox Engelm. ex Bailey]
- Juneberry [June-berry]
- 1895-1986 (1, 2, 4, 93, 106, 109, 138, 155, 156, 158)
- Amelanchier Medik.
- 1895-1977 (3, 37, 130)
- Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer
- 1857-1986 (3, 4, 20)
- Amelanchier arborea (Michx. f.) Fern. [also reported as: Mespilus arborea Michx. f.]
- 1905-1923 (101, 156)
- Symphoricarpos occidentalis Hook.
- Junebud [June-bud] 1930 (106)
- Cercis L.
- Jungle grass 1932 (1)
- Echinochloa Beauv.
- Jungle rice [Junglerice] 1852-Present (5, 50, 56, 94, 119, 122, 155, 163)
- Echinochloa colona (L.) Link [also reported as: Panicum colonum L.]
- Jungle-plum [Jungleplum] 1942 (155)
- Sideroxylon L.
- Juniper, Juniper bush [Juniper-bush], or Juniper tree [Juniper-tree]
- 1785-Present (1, 4, 8, 10, 38, 50, 109, 121, 122, 148, 155, 156, 157, 158, 167)
- Juniperus L.
- 1806-1928 (5, 19, 35, 40, 52, 53, 57, 58, 60, 72, 78, 92, 107, 113)
- Juniperus communis L.
- 1878-1930 (5, 78, 106, 108) Western U.S.
- Juniperus virginiana L.
- Juniper bark 1876 (92)
- Juniperus communis L.
- Juniper berries 1876 (92) fruit
- Juniperus communis L.
- Juniper tamarix 1923 (138)
- Tamarix chinensis Lour. [reported as: Tamarix juniperina]
- Juniper tree [Juniper-tree] 1900-1913 (5, 156, 158) misapplied
- Celtis occidentalis L.
- Juniperus 1902-1917 (57, 60)
- Juniperus communis L.
- Juno's tears 1876-1923? (5, 92, 156) obsolete by 1923
- Verbena officinalis L.
- Junshand 1929 (157)
- Panax quinquefolius L. [reported as: Panax quinquefolium L.]
- Jupiter's staff [Jupiter's-staff] 1900-1913 (5, 69, 158)
- Verbascum thapsus L.
- Jusquiame noir (Fr.) 1828-1900 (6, 7, 158)
- Hyoscyamus niger L.
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