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- Haar (German near Salzburg) 1886 (110) from German for thread or hair
- Linum usitatissimum L.
- Habichtskraut (German) 1900 (158)
- Hieracium L.
- Hackberry [Hack-berry] or Hackberry tree
- 1923-Present (1, 4, 7, 10, 50, 82, 93, 106, 109, 138, 155)
- Celtis L. [also reported as: Celtis (Tourn.) L.]
- 1796-1986 (3, 4, 5, 6, 9, 14, 17, 20, 27, 28, 34, 35, 37, 44, 46, 82, 85, 92, 93, 95, 97, 107, 112, 113, 121, 130, 131, 135, 138, 156, 158)
- Celtis occidentalis L. [also reported as: Celtis crassifolia Lam.]
- 1806-1931 (35, 65, 149, 153) William Clark - spelled hackburry
- Celtis laevigata Willd. var. reticulata (Torr.) L. Benson [also reported as: Celtis reticulata Torr.]
- 1937 (112) Neb
- Celtis occidentalis L. var. occidentalis [reported as: Celtis occidentalis L. var. crassifolia (Lam.) Gray]
- 1821 (12)
- Celtis tenuifolia Nutt. [reported as: Celtis integrifolia, Celtis mississippiensis Bosc]
- Hackmatack 1892-1929 (5, 73, 157, 158) Ipswich Mass
- Juniperus communis L.
- H'ade wathazhinde (Ponca) 1830 (37)
- Panicum virgatum L.
- H'ade-sathe (Omaha-Ponca, sour herb)
- 1919 (37)
- Oxalis stricta L. [reported as: Xanthoxalis stricta (L.) Small]
- 1919 (37)
- Oxalis violacea L. [reported as: Ionaoxalis violacea (L.) Small.]
- H'ade-zhide (Omaha-Ponca, red hay) 1830 (37)
- Andropogon gerardii Vitman [reported as: Andropogon furcatus Muhl.]
- Hadoga (Osage) 1918?-1970? (121)
- Urtica dioica L. ssp. gracilis (Aiton) Seland. [reported as: Urtica dioica L. var. procera (Muhl. ex Willd.) Weddell]
- Hafer (German) 1900 (158)
- Avena sativa L.
- Hafer-corn 1900 (158)
- Avena sativa L.
- Hag taper 1882 (14, 156) obsolete by 1923
- Verbascum thapsus L.
- Hag-berry 1840 (19)
- Celtis occidentalis L.
- Hahnenfuss (German) 1892 (6)
- Ranunculus repens L.
- Hah'-ñi (Kiwomi Keres) 1855 (132)
- Pinus L.
- Hah-wib' (Chemehuevi Shoshonee) 1855 (132)
- Zea mays L.
- Hailweed [Hail weed] 1913 (5)
- Cuscuta epithymum (L.) L. [reported as: Cuscuta epithymum Murray]
- Hainberry 1900 (158)
- Rubus idaeus L.
- Hair bread 1840 (19)
- Bouteloua curtipendula (Michx.) Torr. var. curtipendula [reported as: Atheropogon apludioides [Muhl. ex Willd.]]
- Hair club-rush 1903 (66)
- Eleocharis acicularis (L.) Roemer & J.A. Schultes
- Hair fern 1900-1929 (157, 158)
- Adiantum pedatum L.
- Hair grass [Hairgrass, Hair-grass]
- 1915-1944 (111, 140, 143)
- Agrostis hyemalis (Walt.) B.S.P. [also reported as: Agrostis hiemalis (Walt.) B.S.P.]
- 1885-1903 (56, 66, 90, 92)
- Agrostis scabra Willd.
- 1912-Present (1, 50, 152, 155)
- Deschampsia Beauv.
- 1884-1932 (45, 85, 87, 90)
- Deschampsia caespitosa (L.) Beauv.
- 1903-1977 (3, 66)
- Muhlenbergia capillaris (Lam.) Trin.
- 1936 (93) Neb
- Sporobolus airoides (Torr.) Torr.
- Hair-awn muhly [Hairawn muhly] 1942-Present (50, 155)
- Muhlenbergia capillaris (Lam.) Trin.
- Hairbell [Hair bell, Hair-bell] 1840-1900 (19, 92, 158)
- Campanula rotundifolia L.
- Hair-grass dropseed 1913 (5)
- Sporobolus airoides (Torr.) Torr.
- Hairhound [Hair-hound] 1900-1923 (5, 156, 158)
- Ballota nigra L.
- Hairif 1900-1923? (5, 156, 158) obsolete by 1923
- Galium aparine L.
- Hair-like eragrostis 1901-1907 (56, 72) IA
- Eragrostis trichodes (Nutt.) Wood [also reported as: Eragrostis trichodes (Nutt.) Nash]
- Hair-like fimbristylis 1903 (66)
- Bulbostylis capillaris (L.) Kunth ex C.B. Clarke ssp. capillaris [reported as: Fimbristylis capillaris (L.) Gray]
- Hair-like love grass [Hair-like love-grass] 1913-1938 (5, 119) OK
- Eragrostis trichodes (Nutt.) Wood [also reported as: Eragrostis trichodes (Nutt.) Nash]
- Hair-like sedge 1913-Present (5, 50)
- Carex capillaris L.
- Hair-like stenophyllus 1907-1913 (5, 72) IA
- Bulbostylis capillaris (L.) Kunth ex C.B. Clarke ssp. capillaris [also reported as: Stenophyllus capillaris (L.) Britton]
- Hair-panicle meadow grass [Hair-panicled meadow grass] 1903 (66)
- Eragrostis capillaris (L.) Nees
- Hair-sedge [Hairsedge] Present (50)
- Bulbostylis Kunth
- Hair-spine prickly pear [Hairspine pricklypear]
- Present (50)
- Opuntia polyacantha Haw. var. polyacantha
- Present (50)
- Opuntia polyacantha Haw. var. trichophora (Engelm. & Bigelow) Coult.
- Hair-stalk panic grass [Hair-stalked panic grass] 1885-1903 (66, 87, 90) ME
- Panicum capillare L.
- Hair-stamen 1814 (167)
- Trichostema L.
- Hairweed [Hair weed, Hair-weed] 1913-1923? (5, 156) obsolete by 1923
- Cuscuta epithymum (L.) L. [also reported as: Cuscuta epithymum Murray]
- Hairy amaranth 1768 (165)
- Amaranthus retroflexus L.
- Hairy arrowleaf [Hairy arrow-leaf] 1913 (5)
- Sagittaria latifolia Willd. [reported as: Sagittaria pubescens Muhl. ex Nutt.]
- Hairy bedstraw
- 1913-Present (3, 4, 5, 50, 97, 122, 155)
- Galium pilosum Aiton
- Present (50)
- Galium pilosum Aiton var. puncticulosum (Michx.) Torr. & Gray
- Hairy bindweed 1936 (93) Neb
- Convolvulus arvensis L. [reported as: Convolvulus incanus Vahl.]
- Hairy bracken fern [Hairy brackenfern] Present (50)
- Pteridium aquilinum (L.) Kuhn var. pubescens Underwood
- Hairy brome or Hairy brome grass
- 1913 (5)
- Bromus ciliatus L.
- 1942 (155)
- Bromus commutatus Schrad.
- 1913-Present (5, 50)
- Bromus racemosus L. [reported as: Bromus ramosus Huds., Bromus asper Murr.]
- Hairy bush clover [Hairy bush-clover] 1907-1937 (5, 72, 97)
- Lespedeza hirta (L.) Hornem.
- Hairy buttercup 1913-Present (50, 5)
- Ranunculus sardous Crantz. [also reported as: Ranunculus parvulis L.]
- Hairy button snakeroot [Hairy button snake root, Hairy button snake-root, Hairy button-snake-root]
- 1923-1937 (122, 124, 156)
- Liatris pycnostachya Michx.
- 1913-1936 (5, 93)
- Liatris pycnostachya Michx.var. pycnostachya [also reported as: Lacinaria pycnostachya (Michx.) Kuntze]
- Hairy chamaesaracha 1913-1937 (5, 97)
- Chamaesaracha coniodes (Moric. ex Dunal) Britton
- Hairy cheat
- 1932 (85) SD
- Bromus hordeaceus L.
- 1852 (163)
- Bromus hordeaceus L. ssp. hordeaceus [reported as: Bromus mollis L.]
- Hairy chess 1937 (122) TX
- Bromus commutatus Schrad.
- Hairy clematis Present (50)
- Clematis hirsutissima Pursh
- Hairy corn salad [Hairy cornsalad] Present (50)
- Valerianella amarella (Lindheimer ex Engelm.) Krok
- Hairy crabgrass 1942-Present (50, 140, 155) CO
- Digitaria sanguinalis (L.) Scop.
- Hairy crazyweed 1942 (155)
- Oxytropis monticola Gray [reported as: Oxytropis villosa (Rydb.) K. Schum]
- Hairy creeping love grass [Hairy creeping love-grass] 1913-1938 (5, 93, 99, 119)
- Neeragrostis reptans (Michx.) Nicora [also reported as: Eragrostis reptans (Michx.) Nees, Eragrostis weigeltiana (Reichenb.) Bush]
- Hairy cup grass [Hairy cupgrass] 1942-Present (50, 155)
- Eriochloa villosa (Thunb.) Kunth
- Hairy dozedaisy Present (50)
- Aphanostephus pilosus Buckl.
- Hairy evening-primrose
- Present (50)
- Oenothera villosa Thunb.
- Present (50)
- Oenothera villosa Thunb. ssp. strigosa (Rydb.) W. Dietr. & Raven
- Present (50)
- Oenothera villosa Thunb. ssp. villosa
- Hairy false golden-aster [Hairy false goldenaster]
- Present (50)
- Heterotheca villosa (Pursh) Shinners
- Present (50)
- Heterotheca villosa (Pursh) Shinners var. ballardii (Rydb.) Semple
- Present (50)
- Heterotheca villosa (Pursh) Shinners var. foliosa (Nutt.) Harms
- Present (50)
- Heterotheca villosa (Pursh) Shinners var. minor (Hook.) Semple
- Present (50)
- Heterotheca villosa (Pursh) Shinners var. nana (Gray) Semple
- Present (50)
- Heterotheca villosa (Pursh) Shinners var. villosa
- Hairy feverfew 1937 (122) TX
- Parthenium integrifolium L. var. hispidum (Raf.) Mears [reported as: Parthenium hispidum Raf.]
- Hairy figwort 1937 (97) OK
- Scrophularia marilandica L. [reported as: Scrophularia neglecta Rydb. ex Small ]
- Hairy fimbristylis 1913 (5)
- Fimbristylis puberula (Michx.) Vahl
- Hairy fimbry
- Present (50)
- Fimbristylis puberula (Michx.) Vahl
- Present (50)
- Fimbristylis puberula (Michx.) Vahl var. interior (Britt.) Kral
- Present (50)
- Fimbristylis puberula (Michx.) Vahl var. puberula
- Hairy finger grass 1913 (5)
- Digitaria sanguinalis (L.) Scop. [reported as: Syntherisma sanguinalis (L.) Dulac ]
- Hairy five-eyes [Hairy five eyes] 1977-Present (3, 50)
- Chamaesaracha sordida (Dunal) Gray
- Hairy forked nailwort Present (50)
- Paronychia fastigiata (Raf.) Fern.
- Hairy four-o'clock 1926-Present (4, 50, 98) Neb
- Mirabilis hirsuta (Pursh) MacM.
- Hairy gaura 1977-1986 (3, 4)
- Gaura villosa Torr.
- Hairy germander 1899-1937 (5, 72, 93, 97, 131, 155)
- Teucrium canadense L. var. occidentale (Gray) McClintock & Epling [also reported as: Teucrium occidentale Gray]
- Hairy gold-aster [Hairy goldaster] 1942 (155)
- Heterotheca villosa (Pursh) Shinners var. villosa [reported as: Chrysopsis villosa (Pursh) Nutt. ]
- Hairy golden-aster [Hairy golden aster] 1899 (5, 72, 93, 97, 122, 131, 138, 158)
- Heterotheca villosa (Pursh) Shinners var. villosa [also reported as: Chrysopsis villosa (Pursh) Nutt. ]
- Hairy goldenrod [Hairy golden-rod] 1907-1942 (5, 72, 93, 97, 155)
- Solidago nemoralis Aiton [also reported as: Solidago hispida Muhl.]
- Hairy grama
- 1912-Present (1, 3, 50, 65, 85, 116, 119, 121, 122, 134, 140, 152, 155, 163)
- Bouteloua hirsuta Lag.
- Present (50)
- Bouteloua hirsuta Lag. var. hirsuta
- Hairy hawkweed [Hairy hawk-weed]
- 1900-1937 (5, 97, 156, 158)
- Hieracium gronovii L.
- Present (50)
- Hieracium longipilum Torr.
- Hairy hawthorn 1895 (130) SD
- Crataegus mollis Scheele
- Hairy hedge-nettle [Hairy hedgenettle]
- Present (50)
- Stachys pilosa Nutt.
- Present (50)
- Stachys pilosa Nutt. var. arenicola (Britton) G. Mulligan & D. Munro
- Present (50)
- Stachys pilosa Nutt. var. pilosa
- Hairy leaf-cup [Hairy leafcup] Present (50)
- Smallanthus uvedalius (L.) Mackenzie ex Small
- Hairy lespedeza 1942-Present (3, 4, 50, 155)
- Lespedeza hirta (L.) Hornem.
- Hairy lip fern [Hairy lip-fern, Hairy lipfern] 1878-Present (3, 5, 50, 86, 97, 122, 155)
- Cheilanthes lanosa (Michx.) D.C.Eat. [also reported as: Cheilanthes lanosa (Michx.) Watt., Cheilanthes vestita Swartz.]
- Hairy love grass [Hairy love-grass] 1923 (99) OK
- Eragrostis pilosa (L.) Beauv.
- Hairy marsilea 1899 (131) SD
- Marsilea vestita Hook. & Grev.
- Hairy mesquite or Hairy mesquite grass [Hairy mesquite-grass]
- 1896 (151) NM
- Bouteloua curtipendula (Michx) Torr.
- 1893-1958 (5, 56, 72, 116, 119)
- Bouteloua hirsuta Lag.
- Hairy mistletoe 1986 (4)
- Phoradendron tomentosum (DC.) Engelmann. ex Gray
- Hairy mountain-mint [Hairy mountain mint] 1913?-1986 (4, 5, 97) OK
- Pycnanthemum verticillatum (Michx.) Pers. var. pilosum (Nutt.) Cooperrider [also reported as: Koellia pilosa (Nutt.) Britton, Pycnanthemum pilosum Nutt. ]
- Hairy muskit 1903 (66) possibly, a verbal corruption or misspelling of mesquite
- Bouteloua curtipendula (Michx) Torr.
- Hairy nightshade 1977 (3)
- Solanum physalifolium Rusby [reported as: Solanum villosum P. Mill.]
- Hairy Norwegian cinquefoil 1942 (155)
- Potentilla norvegica L. ssp. monspeliensis (L.) Aschers. & Graebn. [reported as: Potentilla norvegica L. ssp. hirsuta (Michx.) Hyl.]
- Hairy nut-rush [Hairy nut rush] 1913 (5)
- Scleria ciliata Michx.
- Hairy pagoda-plant
- Present (50)
- Blephilia hirsuta (Pursh) Benth.
- Present (50)
- Blephilia hirsuta (Pursh) Benth. var. hirsuta
- Hairy panic grass [Hairy panic-grass] 1852-1938 (85, 119, 163)
- Dichanthelium acuminatum (Sw.) Gould & C.A. Clark var. fasciculatum (Torr.) Freckmann [also reported as: Panicum huachucae Ashe]
- Hairy panicum 1913 (5)
- Dichanthelium acuminatum (Sw.) Gould & C.A. Clark var. fasciculatum (Torr.) Freckmann [reported as: Panicum huachucae Ashe]
- Hairy parsley
- 1899 (131) SD
- Lomatium foeniculaceum (Nutt.) Coult. & Rose [reported as: Peucuedanum villosum Nutt. ]
- 1913-1937 (5, 85, 93, 97)
- Lomatium foeniculaceum (Nutt.) Coult. & Rose ssp. foeniculaceum [also reported as: Cogswellia foeniculacea (Nutt.) Coult. & Rose]
- Hairy parthenium 1913 (5)
- Parthenium integrifolium L. var. hispidum (Raf.) Mears [reported as: Parthenium hispidum Raf.]
- Hairy pennyroyal 1930 (82) IA
- Hedeoma hispida Pursh
- Hairy pepperwort 1913-1937 (5, 97, 122)
- Marsilea vestita Hook. & Grev.
- Hairy phacelia
- 1977-1986 (3, 4)
- Phacelia gilioides Brand.
- 1913-1937 (5, 97, 122) OK TX
- Phacelia hirsuta Nutt. [also reported as: Phacelia hursuta Nutt.]
- Hairy phlox 1913-1923 (5, 156)
- Phlox pilosa L.
- Hairy pinesap [Hairy pine sap] 1913 (5)
- Monotropa hypopithys L. [reported as: Hypopitys lanuginosa (Michx.) Nutt. ]
- Hairy pinweed [Hairy pin-weed] 1900-Present (4, 5, 50, 72, 93, 97, 155, 157, 158)
- Lechea mucronata Raf. [also reported as: Lechea villosa Ell.]
- Hairy popcorn-flower [Hairy popcornflower] 1942 (155)
- Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston var. hispidulus (Greene) Dorn [reported as: Plagiobothrys hispidulus (Greene) I.M. Johnston]
- Hairy portulaca 1913-1937 (5, 97, 122) OK TX
- Portulaca pilosa L.
- Hairy prairie clover 1899-1937 (5, 93, 95, 97, 121, 131)
- Dalea villosa (Nutt.) Spreng [also reported as: Kuhnistera villosa (Nutt.) Kuntze., Petalostemon villosum Nutt., Petalostemum villosum Nutt. ]
- Hairy prickly-poppy [Hairy prickly poppy] 1986 (4)
- Argemone hispida Gray
- Hairy puccoon 1895-1937 (2, 5, 63, 93, 97, 98, 121, 156)
- Lithospermum caroliniense (Walt. ex J.F. Gmel.) MacM. [also reported as: Lithospermum carolinense (Walt.) MacM., Lithospermum gmelinii (Michx.) Hitch., Lithospermum hirsuta Lehm., Lithospermum hirtum Lehm.]
- Hairy purslane speedwell Present (50)
- Veronica peregrina L. ssp. xalapensis (Kunth) Pennell
- Hairy rockcress [Hairy rock cress, Hairy rock-cress] 1895-Present (2, 5, 50, 72, 131, 155)
- Arabis hirsuta (L.) Scop. [also reported as: Arabis hirsuta Scop.]
- Hairy ruellia 1900-1937 (5, 72, 93, 97, 122, 124, 157)
- Ruellia humilis Nutt. [also reported as: Ruellia ciliosa Pursh, Ruellia ciliosa Pursh var. humilis Britton]
- Hairy rush grass 1913 (5)
- Sporobolus compositus (Poir.) Merr. var. drummondii (Trin.) Kartesz & Gandhi [reported as: Sporobolus pilosus Vasey]
- Hairy sedge Present (50)
- Carex lacustris Willd.
- Hairy six-weeks fescue [Hairy sixweeks fescue] 1942 (155)
- Vulpia octoflora (Walt.) Rydb. var. hirtella (Piper) Henr. [reported as: Festuca octoflora Walt. var. hirtella (Piper) Piper ex A.S. Hitchc.]
- Hairy slender paspalum 1903 (66)
- Paspalum setaceum Michx.
- Hairy small-leaf tick-trefoil [Hairy small-leaved tick trefoil, Hairy small-leaved tick-trefoil]
- Present (50)
- Desmodium ciliare (Muhl. ex Willd.) DC.
- 1913-1937 (5, 97)
- Desmodium obtusum (Muhl. ex Willd.) DC. [also reported as: Meibomia obtusa (Muhl.) Vail.]
- Hairy Solomon's seal 1900-1913 (5, 72, 157, 158)
- Polygonatum biflorum (Walt.) Ell. [also reported as: Salomonia biflora (Walt.) Britton]
- Hairy spreading spurge 1913-1937 (5, 93, 97, 122)
- Chamaesyce humistrata (Engelm.) Small [also reported as: Euphorbia humistrata Engelm.]
- Hairy stickseed [Hairy stick seed]
- 1913 (5)
- Hackelia virginiana (L.) I.M. Johnston
- 1907-1937 (72, 93, 97, 122)
- Lappula occidentalis (S. Wats.) Greene var. cupulata (Gray) Higgins [also reported as: Lappula texana (Scheele) Britton]
- Hairy sticktight 1932 (85) SD
- Lappula occidentalis (S. Wats.) Greene
- Hairy sumac [Hairy sumach] 1913-1923 (5, 156)
- Rhus hirta (L.) Sudworth [also reported as: Rhus typhina L.]
- Hairy sunflower
- 1977-Present (3, 4, 50)
- Helianthus hirsutus Raf.
- 1907-1937 (5, 65, 72, 97, 122)
- Helianthus mollis Lam.
- Hairy sweet cicely 1900-1913 (5, 158)
- Osmorhiza claytonii (Michx.) C.B. Clarke [also reported as: Washingtonia claytonii (Michx.) Britton]
- Hairy tickseed 1913 (5)
- Coreopsis lanceolata L. [reported as: Coreopsis crassifolia Aiton]
- Hairy tick-trefoil 1936 (93) Neb
- Desmodium canadense (L.) DC. [reported as: Meibomia canadense (L.) Kuntze]
- Hairy tridens 1977 (3)
- Erioneuron pilosum (Buckl.) Nash [reported as: Tridens pilosus (Buckl.) Hitchc. ]
- Hairy triodia 1937 (122) TX
- Erioneuron pilosum (Buckl.) Nash [reported as: Triodia pilosa (Buckl.) Merr.]
- Hairy umbrella-wort [Hairy umbrella wort, Hairy umbrellawort] 1899-1937 (5, 72, 93, 97, 131, 158)
- Mirabilis hirsuta (Pursh) MacM. [also reported as: Allionia hirsuta Pursh (Alliona hirsuta)]
- Hairy vervain 1937 (97) OK
- Glandularia bipinnatifida (Nutt.) Nutt. var. bipinnatifida [reported as: Verbena ciliata Benth.]
- Hairy vetch 1898-1986 (3, 4, 68, 82, 93, 95, 97, 109, 118, 138, 155)
- Vicia villosa Roth
- Hairy water-clover [Hairy waterclover]
- Present (50)
- Marsilea vestita Hook. & Grev.
- Present (50)
- Marsilea vestita Hook. & Grev. ssp. vestita
- Hairy waterleaf 1919 (107)
- Hydrophyllum appendiculatum Michx.
- Hairy white old-field aster [Hairy white oldfield aster]
- Present (50)
- Symphyotrichum pilosum (Willd.) Nesom
- Present (50)
- Symphyotrichum pilosum (Willd.) Nesom var. pilosum
- Hairy whitetop 1942-Present (50, 155)
- Cardaria pubescens (C.A. Mey.) Jarmolenko
- Hairy wild bergamot [Hairy wildbergamot] 1923 (138)
- Monarda fistulosa L. ssp. fistulosa var. mollis (L.) Benth. [reported as: Monarda mollis L.]
- Hairy wild rye [Hairy wildrye] 1942-Present (50, 155)
- Elymus villosus Muhl. ex Willd.
- Hairy woodland brome Present (50)
- Bromus pubescens Muhl. ex Willd.
- Hairy woolly grass [Hairy woollygrass] Present (50)
- Erioneuron pilosum (Buckl.) Nash
- Hairy yellow violet 1899 (5, 72, 131)
- Viola pubescens Aiton
- Hairy-flower lyme grass [Hairy-flowered lyme grass, Hairy flowered lyme grass] 1901 (56, 94)
- Elymus virginicus L. var. virginicus
[also reported as: Elymus hirsutiglumis Scribn.]
- Hairy-flower paspalum [Hairy-flowered paspalum] 1884 (87)
- Paspalum dilatatum Poir. [reported as: Paspalum dilitatum]
- Hairy-fruit chervil [Hairyfruit chervil]
- Present (50)
- Chaerophyllum tainturieri Hook.
- Present (50)
- Chaerophyllum tainturieri Hook. var. tainturieri
- Hairy-fruit rose-mallow [Hairy fruited rose mallow, Hairy-fruited rose mallow, Hairy-fruited rose-mallow] 1895 (2, 5, 97, 124)
- Hibiscus moscheutos L. ssp. lasiocarpos (Cav.) O.J. Blanchard [also reported as: Hibiscus lasiocarpos Cavar.]
- Hairy-fruit sedge [Hairyfruit sedge, Hairy-fruited sedge] 1893-Present (5, 50, 66, 72)
- Carex trichocarpa Muhl.
- Hairy-grass 1936 (93) Neb
- Agrostis hyemalis (Walt.) B.S.P.
- Hairy-joint meadow-parsnip [Hairy-jointed meadow parsnip, Hairy-jointed meadow-parsnip] 1907-Present (5, 50, 72, 97)
- Thaspium barbinode (Michx.) Nutt.
- Hairy-leaf paspalum [Hairyleaf paspalum] 1942 (155)
- Paspalum laeve Michx. [reported as: Paspalum longipilum Nash]
- Hairy-moss [Hairy moss] Present (50)
- Polytaenia DC.
- Hairy-scale Virginia wild rye [Hairyscale Virginia wildrye] 1942 (155)
- Elymus virginicus L. var. virginicus
[reported as: Elymus virginicus L. var. intermedius (Vasey) Bush]
- Hairy-seed paspalum [Hairyseed paspalum] 1942-Present (3, 50, 155)
- Paspalum pubiflorum Rupr. ex Fourn. [also reported as: Paspalum pubiflorum Rupr. var. glabrum Vasey]
- Hairy-seed sedge [Hairyseed sedge] 1942 (155)
- Carex trichocarpa Muhl.
- Hairy-stem aster [Hairy stemmed aster, Hairy-stemmed aster]
- 1907 (72) IA
- Symphyotrichum pilosum (Willd.) Nesom var. pilosum [reported as: Aster ericoides pilosus (Willd.) Porter]
- 1907-1923 (5, 72, 156)
- Symphyotrichum lateriflorum (L.) A.& D. Löve var. lateriflorum [also reported as: Aster hirsuticaulis Lindl., Aster lateriflorus (L.) Britton]
- Hairy-stem gooseberry [Hairystem gooseberry] 1942-Present (50, 155)
- Ribes hirtellum Michx.
- Hairy-vein blue lettuce [Hairy-veined blue lettuce] 1907-1936 (5, 72, 93)
- Lactuca floridana (L.) Gaertn. var. villosa (Jacq.) Cronq. [also reported as: Lactuca villosa Jacq.]
- Hakakut (Pawnee, sore mouth) 1919 (37)
- Menispermum canadense L.
- Hakastahkata (Pawnee, yellow vine) 1919 (37)
- Cuscuta glomerata Choisy [reported as: Cuscuta paradoxa Raf.]
- Hakusits (Pawnee, thorn) 1919 (37)
- Zanthoxylum americanum P. Mill. [reported as: Xanthoxylum americanum P. Mill.]
- Halberd-leaf mallow [Halberd-leaved mallow] 1923 (156)
- Hibiscus laevis All. [reported as: Hibiscus militaris Cavar.]
- Halberd-leaf orach [Halberd-leaved orache, Halberd-leaved orach] 1899 (5, 62, 93, 131, 158) Book name
- Atriplex subspicata (Nutt.) Rydb. [also reported as: Atriplex patula L.]
- Halberd-leaf rose-mallow [Halberdleaf rosemallow, Halbard leaf rose mallow, Halberd-leaved rose mallow, Halberd-leaved rose-mallow] 1895-Present (2, 4, 5, 50, 72, 93, 95, 97, 124, 156, 158)
- Hibiscus laevis All. [also reported as: Hibiscus militaris Cavar.]
- Halberd-leaved arache 1907 (72) IA
- Atriplex subspicata (Nutt.) Rydb. [reported as: Atriplex patula L.]
- Hale's cyperus 1913 (5)
- Cyperus erythrorhizos Muhl. [reported as: Cyperus halei Torr.]
- Half-breed weed [Halfbreed weed, Halfbreedweed] 1913 (80) IA
- Iva xanthifolia Nutt.
- Half-chaff sedge [Halfchaff sedge] Present (50)
- Lipocarpha R. Br.
- Half-moon milkvetch [Halfmoon milkvetch] Present (50)
- Astragalus allochrous Gray var. playanus Isely
- Halicacabum seu Solanum Indicum 1694 (107) Camerarius
- Physalis alkekengi L.
- Halicacabum sive Alkekengi Virginense 1686 (107) Ray
- Physalis pubescens L.
- Halicacabum sive Solanum Indicum 1694 (107) Camerarius
- Physalis alkekengi L.
- Hall sedge 1944 (139) CO
- Carex hallii Olney
- Hall's beard grass [Hall's beard-grass, Hall's beardgrass] 1852-1938 (5, 56, 72, 119, 131, 163)
- Andropogon hallii Hack.
- Hall's bluestem [Hall's blue-stem] 1932 (85) SD
- Andropogon hallii Hack.
- Hall's bulrush [Halls bulrush, Hall bulrush]
- Present (50)
- Schoenoplectus hallii (Gray) S.G. Sm.
- 1942-Present (3, 50, 139, 155)
- Scirpus hallii Gray
- Hall's club-rush [Hall's club rush] 1907-1913 (5, 72)
- Scirpus hallii Gray
- Hall's cyperus 1913 (5)
- Cyperus setigerus Torr. & Hook. [reported as: Cyperus hallii Britton]
- Hall's milkweed [Halls milkweed] 1942-Present (4, 50, 155)
- Asclepias hallii Gray
- Hall's panic grass [Hall's panicgrass] Present (50)
- Panicum hallii Vasey
- Hall's panicum [Halls panicum] 1937-1942 (122, 155)
- Panicum hallii Vasey
- Hall's rush 1894 (129) SD
- Scirpus hallii Gray
- Hammerwort 1900-1936 (5, 93, 156, 157)
- Parietaria pensylvanica Muhl. ex Willd.
- Hammock sedge Present (50)
- Carex fissa Mack.
- Hand-leaf violet [Hand-leaved violet] 1840-1923 (5, 19, 156)
- Viola palmata L.
- Hanf (German) 1886-1892 (6, 110)
- Cannabis sativa L.
- Hanfnessel (German) 1900 (158)
- Galeopsis bifida Boenn. [reported as: Galeopsis tetrahit L.]
- Hang-leaf goldenrod [Hang-leaf golden-rod] 1840 (19)
- Solidago canadensis L. [reported as: Solidago reflexa (Aiton)]
- Hanke (Oregon tribes) 1828 (7)
- Apios americana Medik. [reported as: Apios tuberosa Moench]
- Hankee 1806 (35) William Clark
- Pediomelum esculentum (Pursh) Rydb. [reported as: Psoralea esculenta Pursh]
- Hank-sintsh (Winnebago, woodchuck tail) 1919 (37)
- Achillea millefolium L.
- Hanpok-hischasu (Winnebago, owl eyes) 1919 (37)
- Physalis hispida (Waterfall) Cronq. [reported as: Physalis lanceolata Michx. (Physalis pumila Nutt. ssp. hispida (Waterfall) Hinton)]
- Hante or h'ante sha (Dakota) 1830 (37)
- Juniperus virginiana L.
- Hantola 1892 (6)
- Zanthoxylum americanum P. Mill. [reported as: Xanthoxylum americanum P. Mill.]
- Hanuga-hi (Omaha-Ponca) 1919 (37)
- Urtica dioica L. ssp. gracilis (Aiton) Seland. [reported as: Urtica gracilis Aiton]
- Hanwinska (Winnebago, white herb) 1919 (37)
- Artemisia ludoviciana Nutt. ssp. ludoviciana [reported as: Artemisia gnaphalodes Nutt.]
- Hánse (Mandan) 1806 (35) William Clark
- Shepherdia argentea (Pursh) Nutt.
- Hantkan or hintkan (Lakota, hair, fur, or fuzz scraped off) 1918-1970 (121)
- Typha latifolia L.
- Haploesthes 1900 (158)
- Haploesthes Gray
- Håpniss [Hopniss, Hopnis] (Native American, Delaware) 1770-1879 (7, 41, 46)
- Apios americana Medik. [also reported as: Apios tuberosa Moench, Glycine apios L.]
- Hapsintsh (Winnebago)
- 1919 (37)
- Vitis cinerea (Engelm.) Millard
- 1919 (37)
- Vitis vulpina L.
- Harbinger-of-spring [Harbinger of spring]
- 1900-1942 (1, 2, 138, 155, 158)
- Erigenia Nutt.
- 1900-Present (4, 5, 50, 138, 155, 156, 158)
- Erigenia bulbosa (Michx.) Nutt.
- Harbison's willow [Harbison willow] 1942 (155)
- Salix caroliniana Michx. [reported as: Salix harbisonii Schneid.]
- Hard fescue or Hard fescue grass 1840-Present (19, 45, 50, 56, 66, 68, 109, 129, 138, 155)
- Festuca brevipila Tracey [also reported as: Festuca duriuscula L., Festuca ovina L. var. duriuscula auct. non (L.) W.D.J. Koch]
- Hard grass [Hardgrass]
- 1876-1913 (5, 92)
- Dactylis glomerata L.
- 1942-Present (50, 155)
- Sclerochloa Beauv.
- 1942 (155)
- Sclerochloa dura (L.) Beauv.
- Hard maple
- 1900-1913 (5, 158)
- Acer nigrum Michx.f.
- 1840-1931 (19, 65, 74)
- Acer saccharinum L.
- 1907-1932 (5, 37, 72, 82, 85, 106, 156)
- Acer saccharum Marsh.
- Hard rush 1913-1923 (5, 156)
- Juncus effusus L.
- Hard thistle [Hard-thistle] 1900-1929 (5, 156, 157, 158)
- Cirsium arvense (L.) Scop. [also reported as: Carduus arvensis (L.) Robson]
- Hardane 1923? (156) obsolete by 1923
- Arctium lappa L.
- Hard-bark hickory 1900-1923 (5, 156, 158)
- Carya alba (L.) Nutt. ex Ell. [also reported as: Hicoria alba (L.) Britton]
- Hardhack [Hard-hack]
- 1896-1913 (5, 76, 156, 158)
- Dasiphora floribunda (Pursh) Kartesz [also reported as: Potentilla fruticosa L., Dasiphora fruticosa (L.) Rydb.]
- 1894-1923 (75, 156, 157, 158) Franconia NH, misapplied
- Ostrya virginiana (P. Mill.) K. Koch [also reported as: Ostrya virginica Willd., possibly O. virginiana ]
- Hardheads
- Present (50)
- Acroptilon Cass.
- Present (50)
- Acroptilon repens (L.) DC.
- Hard-iron 1900 (158)
- Atriplex subspicata (Nutt.) Rydb. [reported as: Atriplex patula L.]
- Hard-leaf golden-rod [Hardleaf goldenrod, Hard-leaved golden-rod, Hard-leaved goldenrod] 1840-1937 (5, 19, 48, 122, 131)
- Oligoneuron rigidum (L.) Small var. rigidum [also reported as: Solidago rigida L.]
- Hardnut hickory [Hard-nut hickory] 1879 (46)
- Carya laciniosa (Michx. f.) G. Don [reported as: Carya sulcata Nutt., Hicoria laciniosa (Michx. f.) Sarg.]
- Hardock 1876-1923? (5, 64, 69, 92, 156, 158) obsolete by 1923
- Arctium lappa L.
- Hard-stem bulrush [Hardstem bulrush]
- Present (50)
- Schoenoplectus ×oblongatus (T. Koyama) Soják [acutus × heterochaetus] [also reported as: Schoenoplectus acutus (Muhl. ex Bigelow) A.& D. Löve]
- 1977-Present (50, 3)
- Schoenoplectus acutus (Muhl. ex Bigelow) A.& D. Löve var. acutus [also reported as: Scirpus acutus Muhl.]
- Hardy aster 1896 (76) Sulphur Grove OH
- Symphyotrichum novae-angliae (L.) Nesom [reported as: Aster novae-angliae L.]
- Hardy bonduc 1820 (38)
- Gymnocladus dioicus (L.) K. Koch [reported as: Guilandina dioica L.]
- Hardy catalpa 1900-1937 (5, 112, 156, 158)
- Catalpa speciosa (Warder) Warder ex Engelm.
- Hardy tuberous-root moonflower [Hardy tuberous-rooted moonflower] 1898 (77) sold under this name by J. Lewis Childs, Floral Park NY
- Ipomoea pandurata (L.) G.F.W. Mey.
- Hare figwort 1907-1937 (5, 72, 93, 97)
- Scrophularia lanceolata Pursh [also reported as: Scrophularia leporella Bicknell]
- Harebell [Hare bell, Hare-bell]
- 1895-1936 (1, 2, 93)
- Campanula L. [also reported as: Campanula (Tourn.) L.]
- 1845-1986 (3, 4, 5, 40, 63, 72, 86, 92, 93, 105, 109, 131, 156,158)
- Campanula rotundifolia L. [reported as: Campanula linifolia (Schrank)]
- Hareburr [Hare-bur] 1876-1900 (92, 158)
- Arctium lappa L.
- Hare-foot clover [Hare's-foot clover, Hare's foot clover] 1913-1923 (5, 156)
- Trifolium arvense L.
- Harenso (Sanskrit) 1886 (110)
- Pisum sativum L.
- Hare's locoweed 1986 (4)
- Oxytropis lagopus Nutt. var. atropupurea (Rydb.) Barneby
- Hare's-beard [Hare's beard, Hares beard] 1876-1923 (5, 69, 92, 156, 158)
- Verbascum thapsus L.
- Hare's-colewort [Hare's colewort] 1900-1929 (5, 156, 157, 158)
- Sonchus oleraceus L.
- Hare's-ear [Hares ear, Hare's ear, Haresear]
- 1876-Present (5, 50, 85, 92, 97, 156)
- Bupleurum rotundifolium L.
- 1900-1942 (1, 93, 155, 158)
- Conringia Heister ex Fabr. [also reported as: Conringia (Heist.) Link., Conringia (Heist.) Adans.]
- 1900-1913 (5, 158)
- Conringia orientalis (L.) Dumort.
- Hare's-ear mustard [Hare's ear mustard]
- 1937-Present (50, 97) OK
- Conringia Heister ex Fabr.
- 1899-Present (3, 4, 50, 80, 131, 156) IA SD
- Conringia orientalis (L.) Dumort.
- Hare's-foot [Hares foot] 1876-1900 (92, 158)
- Trifolium arvense L.
- Hare's-foot locoweed [Haresfoot locoweed] Present (50)
- Oxytropis lagopus Nutt. var. atropupurea (Rydb.) Barneby
- Hare's-lettuce [Hare's lettuce] 1900-1929 (5, 62, 156, 157, 158) old english name
- Sonchus oleraceus L.
- Hare's-palace [Hare's palace] 1900-1929 (62, 157, 158) old english name
- Sonchus oleraceus L.
- Hare's-thistle [Hare's thistle] 1900-1929 (5, 156, 157, 158)
- Sonchus oleraceus L.
- Harewost 1828 (7)
- Maianthemum G.H. Weber ex Wiggers [reported as: Styrandra Raf.]
- Harger's goldenrod Present (50)
- Solidago canadensis L. var. hargeri Fern.
- Hariali (Deccan) 1890 (67)
- Cynodon dactylon (L.) Pers.
- Haricot or Haricot bean 1919-1923 (107, 138)
- Phaseolus vulgaris L.
- Haricot (French) 1886-1892 (6, 110) corruption of Greek arachos used for several legumes
- Phaseolus vulgaris L. [also reported as: Phaseolus vulgaris Savi, possibly P. vulgaris L.]
- Harlequin blue flag Present (50)
- Iris versicolor L.
- Harnacker (Swedish) 1879 (46)
- Parnassia palustris L.
- Harriman's yucca [Harriman yucca] 1942 (155)
- Yucca harrimaniae Trel.
- Harry blephilia 1907-1937 (5, 72, 97)
- Blephilia hirsuta (Pursh) Benth. [also reported as: Blephilia hirsuta (Pursh) Torr.]
- Hart Wright's sedge 1913 (5)
- Carex hyalinolepis Steud. [reported as: Carex impressa (S. H. Wright) Mackenzie]
- Hartheu (German) 1892-1900 (6, 158)
- Hypericum perforatum L.
- Hartleberries 1617 (46)
- Vaccinium pallidum Aiton [reported as: Vaccinium pennsylvanicum Lam., Vaccinium vacillans Kalm ex Torr.)]
- Hartmannia 1937 (124) TX
- Oenothera speciosa Nutt.
- Hart's clover 1900-1929 (5, 156, 157, 158)
- Melilotus officinalis (L.) Lam.
- Hart's thorn 1900-1923 (156, 158)
- Rhamnus cathartica L.
- Hart's trefoil 1900-1929 (157, 158)
- Melilotus officinalis (L.) Lam.
- Hart's-eye [Hart's eye] 1900-1929 (5, 157, 158)
- Pastinaca sativa L.
- Hartshorn Pre 1066-1892 (6, 59)
- Rhamnus cathartica L. [also reported as: Rhamnus catharticus L.]
- Hartshorn bush [Harts horn bush] 1876-1929 (5, 92, 157)
- Osmunda regalis L.
- Hartshorn plant
- 1913 (5)
- Pulsatilla patens (L.) P. Mill.
- 1892-1929 (6, 74, 157, 158)
- Pulsatilla patens (L.) P. Mill. ssp. multifida (Pritz.) Zamels [also reported as: Anemone patens L. var. nuttalliana (DC.) Gray]
- Hart's-tongue [Hart's tongue] 1828 (7)
- Asplenium L. [reported as: Filinguis Raf.]
- Hartweg's evening-primrose [Hartweg evening primrose] 1986 (4)
- Calylophus hartwegii (Benth.) Raven
- Hartweg's sundrops
- Present (50)
- Calylophus hartwegii (Benth.) Raven
- Present (50)
- Calylophus hartwegii (Benth.) Raven ssp. pubescens (Gray) Towner & Raven
- Hartwright's persicaria [Hart Wright's persicaria] 1899-1907 (72, 131)
- Polygonum amphibium L. var. stipulaceum Coleman [also reported as: Polygonum hartwrightii Gray]
- Harvestlice [Harvest lice, Harvest-lice]
- Present (50)
- Agrimonia parviflora Aiton
- 1898-1923 (92, 156)
- Bidens connata Muhl. ex Willd.
- 1900 (158)
- Bidens frondosa L.
- 1923 (156)
- Galium aparine L.
- Harvest-lily [Harvest lily] 1913-1923? (5, 156) obsolete by 1923
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [also reported as: Convolvulus sepium L.]
- Harvey's beak-sedge [Harvey's beaksedge] Present (50)
- Rhynchospora harveyi W. Boott
- Harvey's coreopsis 1937 (97) OK
- Coreopsis grandiflora Hogg ex Sweet var. harveyana (Gray) Sherff [reported as: Coreopsis harveyana Gray]
- Hasel nuts 1806 (35) William Clark
- Corylus cornuta Marsh [reported as: Corylus cornuta H.R.P.]
- Hasenkraut (German) 1900 (158)
- Hypericum perforatum L.
- Hashash 1892 (6)
- Cannabis sativa L.
- Ha-shi (Navajo) 1855 (132)
- Pinus L.
- Hashish [Hashisch] 1892-1911 (6, 59)
- Cannabis sativa L.
- Hasill 1617 (46)
- Corylus americana Walt.
- Hassock grass 1876-1913 (5, 92)
- Deschampsia caespitosa (L.) Beauv. [also reported as: Aira caespitosa ]
- Hastanhanka (Dakota)
- 1919 (37)
- Vitis cinerea (Engelm.) Millard
- 1919 (37)
- Vitis vulpina L.
- Hastgroning (Swedish) 1879 (46)
- Equisetum sylvaticum L.
- Hat-ta-wa-no-min-schi 1892 (6)
- Cornus florida L.
- Haules 1900 (158)
- Hordeum L.
- Havard oak 1942-Present (50, 155)
- Quercus havardii Rydb.
- Havard's poverty grass 1901 (94)
- Aristida havardii Vasey
- Havard's shinnery 1937 (122, 124) TX
- Quercus havardii Rydb.
- Havard's threeawn [Havard three awn, Havard threeawn] 1937-Present (50, 122, 155)
- Aristida havardii Vasey [also reported as: Aristida barbata Fourn.]
- Haver 1900-1919 (107, 158)
- Avena sativa L.
- Haver grass
- 1913 (5)
- Bromus hordeaceus L.
- 1913 (5)
- Bromus sterilis L.
- Havercorn 1913 (5)
- Avena fatua L.
- Haw 1806-1936 (1, 35, 93, 106) William Clark
- Crataegus L.
- Hawahawa (Pawnee) 1830 (37)
- Typha latifolia L.
- Ha-wish (Navajo) 1855 (132)
- Quercus L.
- Hawk's-beard [Hawk's beard, Hawksbeard]
- 1900-Present (4, 50, 93, 155, 156, 158)
- Crepis L.
- 1932-1977 (3, 85, 127)
- Crepis runcinata (James) Torr. & Gray [also reported as: Crepis glauca (Nutt.) Torr. & Gray]
- Hawkweed [Hawk weed, Hawk-weed]
- 1818-Present (1, 2, 4, 10, 50, 63, 93, 109, 138, 155, 156, 158) sap said to sharpen eyesight
- Hieracium L. [also reported as: Hieracium (Tourn.) L.]
- 1977 (3)
- Hieracium canadense Michx.
- 1840-1882 (19, 48) Kansas
- Hieracium gronovii L.
- Haws 1900 (158)
- Avena sativa L.
- Hawthorn
- 1818-Present (1, 2, 4, 7, 10, 50, 82, 105, 106, 109, 112, 138, 156, 158)
- Crataegus L.
- 1977 (3)
- Crataegus calpodendron (Ehrh.) Medik.
- 1870-1913 (5, 92, 103, 113, 130)
- Crataegus chrysocarpa Ashe or Crataegus pedicellata Sargent [also reported as: Crataegus coccinea L.]
- 1986 (4)
- Crataegus coccinioides Ashe
- 1913 (5)
- Crataegus crus-galli L.
- 1930 (82) IA
- Crataegus mollis Scheele
- 1937-1977 (3, 112)
- Crataegus succulenta Schrad. ex Link [also reported as: Crataegus succulenta Link, Crataegus succulenta Link var. pertomentosa (Ashe) E.J. Palm., Crataegus succulenta Link var. succulenta]
- 1977 (3)
- Crataegus viridis L.
- 1913 (5)
- Ribes oxyacanthoides L. ssp. oxyacanthoides [reported as: Grossularia oxyacanthioides (L.) P. Mill.]
- Hawthorn gooseberry 1900-1923 (156, 158)
- Ribes oxyacanthoides L.
- Hay hofe [Hayhofe, Hay hove, Hay-hove] 1900-1923? (5, 156, 157, 158) obsolete by 1923
- Glechoma hederacea L. [also reported as: Nepeta hederacea Trevisan]
- Hay sedge 1907 (5, 72) IA
- Carex siccata Dewey [reported as: Carex foenea Willd.]
- Haycocks 1900-1929 (157, 158)
- Linaria vulgaris P. Mill. [also reported as: Linaria linaria (L.) Karst.]
- Hayden's beardtongue [Hayden's beard-tongue] 1913-1936 (5, 93)
- Penstemon haydenii S. Wats.
- Hayden's penstemon [Hayden penstemon] 1942-1986 (4, 155)
- Penstemon haydenii S. Wats.
- Hayden's sedge 1893-Present (5, 50, 72)
- Carex haydenii Dewey
- Hay-fever weed [Hay fever weed]
- 1923 (156)
- Ambrosia artemisiifolia L. [reported as: Ambrosia artemisaefolia L.]
- 1913 (5)
- Ambrosia artemisiifolia L. var. elatior (L.) Descourtils [reported as: Ambrosia elatior L.]
- 1907-1923 (5, 72, 156) IA
- Ambrosia trifida L.
- Haymaids [Hay maids, Hay-maids] 1876-1923? (5, 92, 156, 157, 158) obsolete by 1923
- Glechoma hederacea L. [also reported as: Nepeta glechoma Benth., Nepeta hederacea (L.) Trevisan]
- Haystack weed 1898 (77) CT
- Phytolacca americana L.
- Haz shutsh (Winnebago, red fruit) 1919 (37)
- Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer
- Hazel, Hazel tree, Hazelnut [Hazel nut, Hazel-nut, Hazle-nut], or Hazelnut tree [Hazel nut tree, Hasel nut-tree]
- 1785-Present (2, 4, 7, 8, 10, 14, 50, 82, 93, 112, 138, 155, 156, 167) original English name
- Corylus L. [also reported as: Corylus (Tourn.) L.]
- 1820-1986 (4, 5, 12, 19, 37, 38, 40, 47, 48, 72, 82, 85, 92, 93, 97, 105, 106, 107, 113, 130, 131, 156)
- Corylus americana Walt.
- Hazel alder
- 1913-1942 (5, 138, 155, 156)
- Alnus incana (L.) Moench ssp. rugosa (DuRoi) Clausen [also reported as: Alnus rugosa (Du Roi) Spreng.]
- 1949-Present (50, 109)
- Alnus serrulata (Aiton) Willd. [also reported as: Alnus serrulata Aiton]
- Hazel dodder 1907-Present (3, 5, 50, 72, 82, 85, 93, 95, 97, 122, 124)
- Cuscuta coryli Engelm.[also reported as: Cuscuta coryli]
- Hazelbrush [Hazel brush] 1893 (22)
- Corylus americana Walt.
- Hazelwort 1923 (156)
- Asarum canadense L.
- Hazi (Omaha-Ponca) Hazi-hi (grape vine)
- 1919 (37) Hazi-hi (grape vine)
- Vitis cinerea (Engelm.) Millard
- 1919 (37)
- Vitis vulpina L.
- Haz-ni-hu (Winnebago, water-fruit bush) 1919 (37)
- Rhus glabra L.
- Haz-ponoponoh' (Winnebago, crunching fruit) 1919 (37)
- Ribes missouriense Nutt. [reported as: Grossularia missouriensis (Nutt.) Coville & Britton]
- Haz-scheck (Winnebago) 1919 (37)
- Fragaria vesca L. ssp. americana (Porter) Staudt [reported as: Fragaria americana (Porter) Britton]
- Haz-scheck (Winnebgao) 1919 (37)
- Fragaria virginiana Duchesne
- Haz-shutz (Winnebago, red fruit) 1919 (37)
- Shepherdia argentea (Pursh) Nutt. [reported as: Lepargyraea argentea (Nutt.) Greene]
- Head-betony [Head betony]
- 1876-1923 (5, 92, 156)
- Pedicularis canadensis L.
- 1898 (77) Western US
- Teucrium canadense L.
- Head sedge 1840 (19)
- Carex cephalophora Muhl. ex Willd.
- Headache
- 1900-1923 (5, 156, 158)
- Papaver dubium L.
- 1900-1923 (5, 156, 158)
- Papaver rhoeas L.
- Headache plant [Head-ache plant]
- 1913 (5)
- Pulsatilla patens (L.) P. Mill.
- 1893-1929 (74, 157, 158) MN
- Pulsatilla patens (L.) P. Mill. ssp. multifida (Pritz.) Zamels [also reported as: Anemone patens L. var. nuttalliana (DC.) Gray]
- Headsman [Headsmen] 1900-1923 (5, 156, 158)
- Plantago lanceolata L.
- Headwark 1900 (158) verbal corruption or head-ache
- Papaver rhoeas L.
- Heal-all [Healall]
- 1828 (7)
- Pedicularis canadensis L. ssp. canadensis [reported as: Pedicularis gladiata Michx.]
- 1828-1929 (5, 7, 156, 158)
- Platanthera orbiculata (Pursh) Lindl. [also reported as: Habenaria orbiculata Torr., Lysias orbiculata (Pursh) Rydb., Orchis orbiculata Pursh]
- 1876-1932 (1, 2, 5, 45, 72, 82, 92, 93, 97, 106, 109, 114, 156, 157, 158)
- Prunella vulgaris L.
- 1828 (7)
- Scrophularia L. [reported as: Scrophularia (Tourn.) L.]
- 1876-1936 (92, 93, 131, 156)
- Scrophularia marilandica L. [also reported as: Scrophularia marylandica L.]
- Healbite [Heal bite, Heal-bite] 1900-1923 (5, 156, 158)
- Alyssum alyssoides (L.) L.
- Healdog [Heal-dog] 1900 (158)
- Alyssum alyssoides (L.) L.
- Healing-blade [Healing blade] 1900-1929 (5, 62, 156, 157, 158) old english name
- Plantago major L.
- Heart seed [Heart seed, Heart-seed] 1814-1900 (109, 138, 155, 158, 167)
- Cardiospermum L.
- Heart snake root, Heart snakeroot, Heart snake-root 1828-1929 (5, 7, 64, 92, 156, 158)
- Asarum canadense L.
- Heart-leaf alexanders [Heart-leaved alexanders] 1899-1913 (5, 72, 131)
- Zizia aptera (Gray) Fern. [also reported as: Zizia cordata (Walt.) DC.]
- Heart-leaf ampelopsis [Heartleaf ampelopsis] 1923-1942 (138, 155)
- Ampelopsis cordata Michx.
- Heart-leaf arnica [Heartleaf arnica, Heart-leaved arnica] 1899-Present (5, 50, 131, 155)
- Arnica cordifolia Hook. [also reported as: Arnica cordifolius Hook.]
- Heart-leaf aster [Heartleaf aster, Heart-leaved aster] 1912-1942 (62, 82, 155, 156)
- Symphyotrichum cordifolium (L.) Nesom
[also reported as: Aster cordifolius L.]
- Heart-leaf avens [Heartleaf avens] 1977-1986 (3, 4)
- Geum vernum (Raf.) Torr. & Gray
- Heart-leaf balsam poplar [Heart-leaved balsam poplar] 1857 (20)
- Populus balsamifera L. ssp. balsamifera [reported as: Populus candicans Aiton]
- Heart-leaf buttercup [Heartleaf buttercup, Heart-leaved buttercup] 1913-Present (5, 50)
- Ranunculus cardiophyllus Hook.
- Heart-leaf four-o'clock [Heartleaf four o'clock] Present (50)
- Mirabilis nyctaginea (Michx.) MacM.
- Heart-leaf nettle [Heartleaf nettle] Present (50)
- Urtica chamaedryoides Pursh
- Heart-leaf peppervine [Heartleaf peppervine] Present (50)
- Ampelopsis cordata Michx.
- Heart-leaf rose-mallow [Heartleaf rosemallow] Present (50)
- Hibiscus martianus Zucc.
- Heart-leaf skullcap [Heartleaf skullcap] Present (50)
- Scutellaria ovata Hill
- Heart-leaf umbrella-wort [Heart-leaved umbrella wort, Heart-leaved umbrella-wort] 1899-1937 (5, 93, 97, 131)
- Mirabilis nyctaginea (Michx.) MacM. [also reported as: Allionia nyctaginea Michx., Alliona nyctaginea Michx.]
- Heart-leaf willow [Heartleaf willow, Heart-leaved willow] 1840-1942 (1, 5, 19, 72, 93, 97, 108, 130, 131, 138, 155)
- Salix eriocephala Michx. [also reported as: Salix cordata Muhl.]
- Heart-leaves 1923 (156)
- Maianthemum canadense Desf.
- Heartnut 1949 (109)
- Carya cordiformis (Wangenh.) K. Koch [reported as: Juglans cordiformis Maxim.]
- Heart-of-the-earth 1900-1923 (5, 156, 158)
- Prunella vulgaris L.
- Heartpea [Heart pea, Heart-pea] 1900-1923 (5, 107, 156, 158)
- Cardiospermum halicacabum L.
- Heart's-ear 1900 (158)
- Polygonum persicaria L.
- Heart's-ease [Heart's ease, Heartsease, Hearts' ease]
- 1898-1930 (77, 106) Erie County PA
- Polygonum L.
- 1894-1913 (5, 114) Neb
- Polygonum amphibium L. var. emersum Michx. [reported as: Polygonum emersum (Michx.) Britt., Persicaria amphibia (L.) S.F. Gray, possibly this species]
- 1930 (82) IA
- Polygonum lapathifolium L.
- 1840-1930 (5, 19, 75, 79, 92, 106, 156, 158) from shape of dark spots on leaves, misapplied
- Polygonum persicaria L. [also reported as: Persicaria persicaria (L.) Small.]
- 1894-1932 (82, 85, 114)
- Polygonum pensylvanicum L. [also reported as: Persicaria pennsylvanica (L.) Small.]
- 1898-1923 (77, 156, 158) misapplied
- Polygonum amphibium L. [also reported as: Polygonum terrestre ]
- 1898 (77) Cambridge MA
- Prunella vulgaris L.
- 1930-1932 (1, 82) IA
- Viola L. [also reported as: Viola (Tourn.) L.]
- 1840-1949 (5, 6, 15, 19, 57, 92, 97, 109, 158)
- Viola tricolor L. [also reported as: Viola tricolor L. var. hortensis DC.]
- Heartseed [Hear -seed, Heart-seed]
- 1818-1932 (1, 2, 5, 10, 13, 15, 92, 156, 158) Book name
- Cardiospermum halicacabum L.
- 1932 (105)
- Polygonum pensylvanicum L.
- Heart's-eye 1923 (156)
- Pastinaca sativa L.
- Heart's-pansy 1900 (158)
- Viola tricolor L.
- Heart-spot knotweed 1840 (19)
- Polygonum persicaria L.
- Heartweed [Heart weed, Heart-weed] 1893-1923 (5, 62,75, 77, 156, 158) from the shape of dark spots on the leaves
- Polygonum persicaria L. [also reported as: Persicaria persicaria (L.) Small.]
- Heart-wing sorrel [Heartwing sorrel] 1942-Present (3, 4, 50, 155)
- Rumex hastatulus Baldw.
- Heartwort [Heart-wort]
- 1900 (158)
- Aristolochia L.
- 1900-1929 (5, 156, 157, 158)
- Melilotus officinalis (L.) Lam.
- Heath 1896-1923 (76, 156, 158) Wellsfleet MA
- Hudsonia tomentosa Nutt.
- Heath aster
- 1900 (158)
- Chaetopappa DC. [reported as: Leucelene Greene]
- 1923-1949 (109, 138, 155)
- Symphyotrichum ericoides (L.) Nesom var. ericoides [also reported as: Aster ericoides L.]
- Heath corn 1876-1900 (92, 158)
- Fagopyrum esculentum Moench [also reported as: Polygonum fagopyrum L.]
- Heathbells [Heath bells, Heath-bells, Heath-bell] 1900-1923 (5, 156, 158)
- Campanula rotundifolia L.
- Heather 1930 (106) CO
- Eriogonum effusum Nutt.
- Heatherbells 1923 (156)
- Campanula rotundifolia L.
- Heath-like aster 1923-1930 (82, 156)
- Symphyotrichum ericoides (L.) Nesom var. ericoides [also reported as: Aster ericoides L.]
- Heath-like hudsonia 1913 (5)
- Hudsonia tomentosa Nutt.
- Heavenward tree 1900-1923? (5, 156, 158) obsolete by 1923
- Ailanthus altissima (Mill) Swingle [also reported as: Ailanthus glandulosa Desf. ]
- Heavy sedge
- 1893-Present (5, 50, 72)
- Carex gravida Bailey
- 1977-Present (50, 3)
- Carex gravida Bailey var. gravida
- 1977-Present (50, 3)
- Carex gravida Bailey var. lunelliana (Mack.) Herm.
- Heavy-top broom grass [Heavy-topped broom grass] 1884-1885 (87, 88)
- Andropogon glomeratus (Walt.) B.S.P. [also reported as: Andropogon macrourum Michx. (Cinna glomerata Walt.)]
- Heavy-wood pine [Heavy-wooded pine]
- 1857 (20)
- Pinus ponderosa P.& C. Lawson
- 1930-1932 (1, 136) SD
- Pinus ponderosa P.& C. Lawson var. scopulorum Engelm. [also reported as: Pinus scopulorum (Engelman.) Lemmon.]
- Heck-how 1900-1904 (69, 158)
- Conium maculatum L.
- Hedeoma 1911-1917 (55, 59)
- Hedeoma pulegioides (L.) Pers.
- Hedeoma herba 1828 (7)
- Hedeoma pulegioides (L.) Pers.
- Hedeome Pouliot (French) 1828 (7)
- Hedeoma pulegioides (L.) Pers.
- Hederich (German) 1900 (158)
- Sisymbrium officinale (L.) Scop
- Hedge beech 1649 (46)
- Possibly,Celtis occidentalis L.
- Hedge bindweed
- 1986 (4)
- Calystegia R. Br.
- 1882-1986 (3, 4, 5, 14, 62, 72, 80, 82, 93, 131, 138, 156, 158)
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [also reported as: Convolvulus repens L., Convolvulus sepium L.]
- Hedge cornbind 1942 (155)
- Polygonum scandens L.
- Hedge false bindweed
- Present (50)
- Calystegia sepium (L.) R. Br.
- Present (50)
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt
- Hedge fumitory 1900-1923 (5, 156, 158)
- Fumaria officinalis L.
- Hedge garlic 1898-1923 (5, 92, 156, 158)
- Alliaria petiolata (Bieb.) Cavara & Grande [also reported as: Alliaria alliaria (L.) Britton, Alliaria officinalis Andrz.]
- Hedge glorybind 1942 (155)
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [reported as: Convolvulus sepium L.]
- Hedge mustard 1818-1936 (1, 10, 93)
- Erysimum L. [also reported as: Erysimum (Tourn.) L.]
- Hedge pink [Hedge-pink] 1900-1929 (5, 62, 64, 156, 157, 158)
- Saponaria officinalis L.
- Hedge plant 1900-1923 (5, 156, 158)
- Maclura pomifera (Raf.) Schneid. [also reported as: Toxylon pomiferum Raf.]
- Hedge tree 1898 (78) Southwest MO
- Maclura pomifera (Raf.) Schneid. [reported as: Maclura aurantiaca Nutt. ]
- Hedge-apple [Hedge apple] 1923 (156)
- Maclura pomifera (Raf.) Schneid.
- Hedgebell [Hedgebells, Hedge-bells]
- 1900 (158)
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [reported as: Convolvulus sepium L.]
- 1876-1929 (92, 156, 157, 158)
- Convolvulus arvensis L.
- Hedge-berry 1923 (156)
- Celtis occidentalis L.
- Hedge-garlic [Hedge garlic] 1900-1932 (1, 158)
- Alliaria Heister ex Fabr. [also reported as: Allaria Adans., possibly this genus]
- Hedgehog [Hedge hog] 1913-1923? (5, 156) obsolete by 1923
- Scandix pecten-veneris L.
- Hedgehog burweed [Hedge-hog-bur-weed] 1900-1912 (62, 158) IN
- Xanthium strumarium L. var. canadense (P. Mill.) Torr. & Gray [also reported as: Xanthium canadense P. Mill.]
- Hedgehog cactus [Hedge hog cactus]
- 1876 (92)
- Echinocactus texensis Hopffer.
- 1932-1986 (4, 85) SD
- Echinocereus viridiflorus Engelm.
- Present (50)
- Pediocactus Britton & Rose
- Hedgehog cereus 1932-Present (1, 50)
- Echinocereus Engelm.
- Hedge-hog club-rush [Hedgehog club-rush] 1840-1923 (5, 19, 156)
- Cyperus echinatus (L.) Wood [also reported as: Cyperus ovularis (Michx.) Torr., Mariscus echinatus [Ell.]]
- Hedgehog grass [Hedge hog grass]
- 1876 (92)
- Echinochloa crus-galli (L.) Beauv. [reported as: Echinochloa schinata]
- 1840-1885 (19, 88)
- Elymus hystrix L. [also reported as: Asparella hystrix (L.) Moench]
- Hedgehog prickly-poppy [Hedge-hog prickly poppy Hedgehog pricklypoppy]
- 1923-1942 (138, 155)
- Argemone hispida Gray [also reported as: Argemone platyceras hispida]
- 1977-Present (3, 36, 50)
- Argemone squarrosa Greene
- Hedgehog thistle
- 1900 (158)
- Opuntia humifusa (Raf.) Raf. var. humifusa [reported as: Opuntia opuntia (L.) Karst.]
- 1913 (5)
- Pediocactus simpsonii (Engelm.) Britton & Rose
- Hedgehog woodrush Present (50)
- Luzula echinata (Small.) Hermann
- Hedgehog-coneflower 1923 (138)
- Echinacea Moench
- Hedge-hyssop [Hedge hyssop, Hedgehyssop]
- 1826-Present (1, 2, 4, 10, 26, 50, 155, 156)
- Gratiola L.
- 1840-1876 (19, 92)
- Gratiola aurea Muhl.
- 1977-1986 (3, 4)
- Gratiola neglecta Torr.
- 1932-1986 (4, 85, 93)
- Gratiola virginiana L.
- Hedgelily [Hedge lily, Hedge-lily] 1900-1923? (5, 156, 158) obsolete by 1923
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [also reported as: Convolvulus sepium L.]
- Hedge-maids [Hedge maids] 1876-1923 (5, 92, 156, 157, 158)
- Glechoma hederacea L. [also reported as: Nepeta glechoma Benth., Nepeta hederacea (L.) Trevisan]
- Hedge-mustard [Hedge mustard, Hedge-mustard]
- 1929 (157)
- Barbarea vulgaris Aiton f. [reported as: Barbarea barbarea (L.) MacM.]
- 1849-Present (4, 13, 15, 50, 156)
- Sisymbrium L.
- 1828-Present (3, 4, 5, 7, 13, 15, 19, 49, 50, 62, 63, 72, 76, 80, 85, 92, 97, 107, 131, 145, 157, 156, 158)
- Sisymbrium officinale (L.) Scop
- Hedge-nettle [Hedge nettle, Hedgenettle]
- 1818-Present (1, 2, 4, 10, 50, 63, 93, 106, 156, 158)
- Stachys L. [also reported as: Stachys (Tourn.) L.]
- 1977-1986 (3, 4)
- Stachys pilosa Nutt. var. pilosa
- Hedge-parsley [Hedge parsley, Hedgeparsley]
- 1932-Present (1, 4, 50)
- Torilis Adans.
- 1986 (4)
- Torilis arvensis (Huds.) Link
- Hedge-taper [Hedge taper, Hedge-tapers] 1900-1929 (5, 69, 156, 157, 158)
- Verbascum thapsus L.
- Hedgeweed [Hedge weed, Hedge-weed] 1900-1923 (5, 156, 158)
- Sisymbrium officinale (L.) Scop [also reported as: Erysimum officinale (L.) Scop.]
- Hedte-shutsh (Winnebago) 1830 (37)
- Erythronium mesochoreum Knerr
- Hedysarum
- 1900-1986 (1, 4, 158)
- Hedysarum L. [also reported as: Hedysarum (Tourn.) L.]
- 1899 (131) SD
- Hedysarum alpinum L. [reported as: Hedysarum americanum (Michx.) Britton]
- 1913 (5)
- Hedysarum boreale Nutt.
- Hedysarum triphyllum Canadense 1629 (46)
- Desmodium canadense (L.) DC.
- H'eh'aka ta pezhuta (Dakota, elk medicine) 1919 (37)
- Monarda fistulosa L.
- Heidekorn (German) 1892 (6)
- Fagopyrum esculentum Moench
- Heil-aller-Schaden (German) 1900 (158)
- Veronica serpyllifolia L.
- Helecho macho (Spanish) 1900 (158)
- Dryopteris filix-mas (L.) Schott
- Helenie d'Automne (French) 1828 (7)
- Helenium autumnale L.
- Helenium 1828 (7)
- Helenium autumnale L.
- Helenium canadense 1676 (107) Amman
- Helianthus tuberosus L.
- Helianthemum indicum tuberosum 1623 (107) Bauhin
- Helianthus tuberosus L.
- Helianthus foliis ovata cordatis triplinervus 1729 (107) Gronovius
- Helianthus tuberosus L.
- Helianthus radice tuberosa esculenta, Hierusalem artichoke 1739 (107) Clayton
- Helianthus tuberosus L.
- Heliopsis 1942-Present (50, 155)
- Heliopsis Pers.
- Heliotrope
- 1895-Present (1, 2, 4, 50, 82, 106, 138, 155, 156, 158)
- Heliotropium L. [also reported as: Heliotropium (Tourn.) L.]
- Heliotrope 1929-1936 (93, 157) Neb
- Heliotropium curassavicum L. var. obovatum DC. [also reported as: Heliotropium spathulatum Rydb.]
- Helleborine
- 1900-Present (1, 50, 158)
- Epipactis Zinn [also reported as: Epipactis R. Br. , possibly this genus]
- 1932-1977 (3, 85)
- Epipactis gigantea Dougl. ex Hook. [also reported as: Serapias gigantea (Dougl.) A.A. Eat.]
- Heller's panicum [Heller panicum] 1942 (155)
- Dichanthelium oligosanthes (J.A. Schultes) Gould var. scribnerianum (Nash) Gould [reported as: Panicum helleri Nash]
- Heller's rosette grass
- Present (50)
- Dichanthelium oligosanthes (J.A. Schultes) Gould
- Present (50)
- Dichanthelium oligosanthes (J.A. Schultes) Gould var. oligosanthes
- Heller's wild onion 1937 (97) OK
- Allium drummondii Regel [reported as: Allium helleri Small]
- Hellvine [Hell-vine] 1923 (156)
- Campsis radicans (L.) Seem. ex Bureau [reported as: Tecoma radicans Juss.]
- Hellweed [Hell weed, Hell-weed]
- 1923 (156)
- Calystegia sepium (L.) R. Br. ssp. angulata Brummitt [reported as: Convolvulus sepium L.]
- 1923 (156)
- Cuscuta epithymum (L.) L. [reported as: Cuscuta epithymum Murray]
- 1900-1923 (5, 156, 158)
- Ranunculus arvensis L.
- Helmet-flower [Helmet flower]
- 1900 (158)
- Scutellaria L.
- 1879 (46)
- Scutellaria galericulata L.
- 1876 (92)
- Scutellaria lateriflora L.
- Helmkraut (German)
- 1900 (158)
- Scutellaria L.
- 1892 (6)
- Scutellaria lateriflora L.
- Helxine 1900-1929 (156, 157)
- Parietaria pensylvanica Muhl. ex Willd.
- Hemicarpha 1907 (72) IA
- Lipocarpha micrantha (Vahl) G. Tucker [reported as: Hemicarpha micrantha (Vahl) Pax]
- Hemlock
- 1939 (148) CO
- Cicuta maculata L. var. angustifolia Hook. [reported as: Cicuta occidentalis Greene]
- 1818-1939 (10, 14, 49, 53, 55, 60, 71, 92, 148) CO
- Conium maculatum L.
- 1814 (167) misapplied
- Pinus L.
- 1923 (156)
- Sium suave Walt. [reported as: Sium cicutaefolium Gmelin. (Sium cicutifolium Schrank)]
- Hemlock beggarticks 1840 (19)
- Bidens bipinnata L.
- Hemlock geranium 1840 (19)
- Erodium cicutarium (L.) L'Hér. ex Aiton
- Hemlock heron's-bill [Hemlock heron's bill] 1900-1913 (5, 158)
- Erodium cicutarium (L.) L'Hér. ex Aiton
- Hemlock stork's-bill [Hemlock stork's bill] 1876-1937 (5, 92, 97, 156, 157, 158)
- Erodium cicutarium (L.) L'Hér. ex Aiton
- Hemlock water-parsnip [Hemlock waterparsnip, Hemlock water parsnip] 1899-Present (50, 5, 72, 131, 155, 157)
- Sium suave Walt. [also reported as: Sium cicutaefolium Gmelin., Sium cicutifolium Schrank]
- Hemlock-chervil [Hemlock chervil] 1913-1923 (5, 156)
- Torilis arvensis (Huds.) Link [also reported as: Torilis anthriscus (L.) Gmel. ]
- Hemlock-leaf moonwort [Hemlock-leaved moonwort] 1900-1913 (5, 157, 158)
- Botrychium virginianum (L.) Sw.
- Hemlock-parsley [Hemlockparsley, Hemlock parsley]
- 1900-Present (50, 155, 158)
- Conioselinum Hoffmann
- 1911-1932 (1, 5, 93, 95, 156)
- Conioselinum chinense (L.) B.S.P.
- Hemp
- 1900-1936 (1, 4, 50, 82, 93, 138, 155, 158)
- Cannabis L. [also reported as: Cannabis (Tourn.) L.]
- 1840-1986 (4, 5, 6, 14, 21, 19, 53, 57, 59, 61, 72, 80, 82, 85, 92, 93, 95, 107, 109, 110, 114, 131, 145, 148, 155, 156, 157, 158)
- Cannabis sativa L.
- Hemp agrimony 1923 (156)
- Ageratina altissima (L.) King & H.E. Robins. [reported as: Eupatorium urticaefolium Reicherd.]
- Hemp dead nettle [Hemp dead-nettle] 1840-1923 (5, 19, 156, 158)
- Galeopsis bifida Boenn. [also reported as: Galeopsis tetrahit L.]
- Hemp dogbane 1923-1977 (3, 122, 138, 155, 156)
- Apocynum cannabinum L.
- Hemp nettle [Hemp-nettle, Hempnettle]
- 1900-Present (4, 50, 155, 156, 158)
- Galeopsis L.
- 1899-1977 (1, 3, 5, 10, 63, 72, 85, 92, 156, 158)
- Galeopsis bifida Boenn. [also reported as: Galeopsis tetrahit L.]
- Hemp sesbania 1942 (155)
- Sesbania herbacea (P. Mill.) McVaugh [reported as: Sesbania exlatata (Raf.) Rydb.]
- Hemp tree [Hemp-tree] 1930-1949 (82, 109, 158)
- Vitex agnus-castus L.
- Hempseed [Hemp seed] 1876 (92)
- Cannabis sativa L.
- Hempweed [Hemp weed, Hemp-weed] 1876-1929 (92, 157, 158)
- Cannabis sativa L.
- Hen plant [Hen-plant]
- 1900-1923? (5, 156, 157, 158) obsolete by 1923
- Plantago lanceolata L.
- 1900-1929 (5, 156, 157, 158)
- Plantago major L.
- Hen-and-chickens [Hen and chickens] 1876-1913 (5, 92, 158)
- Bellis perennis L.
- Henbane
- 1900-Present (50, 109, 138, 155, 158)
- Hyoscyamus L.
- 1870-1986 (1, 3, 4, 6, 7, 10, 14, 20, 49, 52, 53, 54, 55, 57, 59, 60, 61, 85, 92, 126, 138, 156, 158)
- Hyoscyamus niger L.
- Henbell 1900 (158)
- Hyoscyamus niger L.
- Henbit [Hen-bit]
- 1900-1923 (5, 156, 158)
- Ballota nigra L.
- 1828-1936 (1, 7, 93)
- Lamium L. [also reported as: Lamium (Tourn.) L.]
- 1894-1986 (3, 4, 5, 19, 62, 72, 75, 92, 93, 97, 122, 124, 156, 158)
- Lamium amplexicaule L.
- Henbit dead-nettle [Henbit dead nettle, Henbit deadnettle] 1900-Present (5, 50, 155, 156, 158)
- Lamium amplexicaule L.
- Henkam 1900 (158)
- Hyoscyamus niger L.
- Hen-pepper 1923 (156)
- Capsella bursa-pastoris (L.) Medik.
- Hens 1893-1923 (74, 156, 158) Ferrisburgh VT
- Viola canadensis L.
- Hen's-bill 1900 (158)
- Onobrychis viciifolia Scop. [reported as: Onobrychis viciaefolia Scop.]
- Hens'-toes [Hens' toes] 1898 (78) ME
- Spiranthes cernua (L.) L.C. Rich.
- Hepaticae albae 1879 (46)
- Parnassia palustris L.
- Herb Barbara [Herb-Barabra] 1876-1913 (5, 92)
- Barbarea vulgaris Aiton f. [also reported as: Barbarea barbarea (L.) MacM.]
- Herb Bennet
- 1892-1919 (6, 71, 107)
- Conium maculatum L.
- 1840-1923 (5, 19, 156)
- Geum aleppicum Jacq. [also reported as: Geum strictum Aiton]
- Herb Christopher [Herb-Christopher]
- 1900-1923 (156, 158)
- Actaea pachypoda Ell. [also reported as: Actaea alba (Aiton) Willd.]
- 1900-1929 (5, 156, 157, 158)
- Actaea rubra (Aiton) Willd.
- 1818 (10)
- Actaea rubra (Aiton) Willd. ssp. rubra
[reported as: Actaea americana]
- 1876-1929 (5, 92, 157)
- Osmunda regalis L.
- Herb Dutchman's pipe [Herb Dutchman's-pipe, Herb Dutchmanspipe] 1942 (155)
- Aristolochia serpentaria L.
- Herb grace [Herb-grace] 1913-1923 (5, 156)
- Verbena officinalis L.
- Herb John [Herb-John] 1900-1929 (5, 62, 156, 157, 158)
- Hypericum perforatum L.
- Herb Margaret
- 1913 (5)
- Bellis perennis L.
- 1876-1923 (5, 92, 156, 158)
- Leucanthemum vulgare Lam. [also reported as: Chrysanthemum leucanthemum L.]
- Herb of Santa Barbara 1849 (13)
- Barbarea Aiton f. [reported as: Barbarea R. Br.]
- Herb patience 1919-1949 (107, 109)
- Rumex patientia L.
- Herb Robert [Herb-Robert] 1671-1986 (2, 4, 5, 7, 15, 19, 46, 92, 109, 138, 156, 157, 158) Josselyn
- Geranium robertianum L. [also reported as: Robertiella robertiana (L.) Hanks.]
- Herb sherard 1913-1923 (5, 156)
- Sherardia arvensis L.
- Herb sophia 1898-Present (5, 50, 92, 97, 156, 157, 158)
- Descurainia sophia (L.) Webb ex Prantl [also reported as: Sophia sophia (L.) Britton, Sisymbrium sophia L.]
- Herb tuppence or Herb twopence, Herb-twopence 1900-1923 (5, 156, 158)
- Lysimachia nummularia L.
- Herb wickopy [Herb-wicopy] 1900-1929 (5, 157, 158)
- Chamerion angustifolium (L.) Holub
- Herba catariae 1898 (49)
- Nepeta cataria L.
- Herba medica (Latin) 1886 (110)
- Medicago sativa L.
- Herba nepetae 1898 (49)
- Nepeta cataria L.
- Herba salicariae 1898 (49)
- Lythrum salicaria L.
- Herba spagna (Itallian) 1886 (110)
- Medicago sativa L.
- Herba Veneris 1828 (7)
- Adiantum pedatum L.
- Herbaceous carrion-flower 1936 (93) Neb
- Smilax herbacea L.
- Herbaceous periwinkle 1923-Present (50, 138)
- Vinca herbacea Waldst. & Kit.
- Herb-aux-Charpentiers [Herbe aux Charpentiers] (French) 1900-1923 (156, 158)
- Achillea millefolium L.
- Herbe a 3 quarts (Louisiana Purchase) 1828 (7)
- Verbesina virginica L.
- Herbe à Fiévre (French) 1892-1900 (6, 158)
- Eupatorium perfoliatum L.
- Herbe à la Ouate (French) 1892-1900 (6, 158)
- Asclepias syriaca L. [also reported as: Asclepias cornuti Dcne.]
- Herbe à la puce (French Can.) 1770 (41)
- Apocynum androsaemifolium L.
- Herbe a l'hirondelle (French) 1892 (6)
- Chelidonium majus L.
- Herbe à quartre feuilles (French, Four-leaved grass) 1796 (17)
- Veronicastrum virginicum (L.) Farw. [reported as: Veronica virginica L.]
- Herbe à Robert (French) 1900 (158)
- Geranium robertianum L.
- Herbe a serpente a sonnetes (French) 1820 (43)
- Podophyllum peltatum L.
- Herbe aux chantres (French) 1900 (158)
- Sisymbrium officinale (L.) Scop
- Herbe aux chats (French) 1900 (158)
- Nepeta cataria L.
- Herbe aux vers (French) 1900 (158)
- Tanacetum vulgare L.
- Herbe de Feu (French) 1892 (6)
- Erechtites hieraciifolia (L.) Raf. ex DC.
- Herbe de la Laque (French) 1892 (6)
- Phytolacca americana L. var. americana [reported as: Phytolacca decandra L.]
- Herbe de St. Antoine (French) 1892 (6)
- Epilobium palustre L.
- Herbe de Ste. Christophr blanc (French) 1892 (6)
- Actaea pachypoda Ell. [reported as: Actaea alba (Aiton) Willd.]
- Herbe Parfaite (French) 1892-1900 (6, 158)
- Eupatorium perfoliatum L.
- Herbe St. Jean (French) 1892 (6)
- Hypericum perforatum L.
- Herbilia (Italian) 930 AD (110)
- Possibly,Pisum sativum L.
- Herb-of-the-cross 1912-Present (5, 50, 62, 156)
- Verbena officinalis L.
- Herb-robert geranium [Herbrobert geranium] 1942 (155)
- Geranium robertianum L.
- Herb-trinity 1900 (158)
- Viola tricolor L.
- Herb-wickopy 1923 (156)
- Chamerion angustifolium (L.) Holub ssp. angustifolium [reported as: Epilobium angustifolium L.]
- Herd's grass [Herds-grass, Herd's-grass, Herds-grass, Herds' grass, Herd grass]
- 1876-1901 (5, 45, 92, 94)
- Agrostis gigantea Roth [reported as: Agrostis dispar, Agrostis alba L.]
- 1876-1949 (5, 45, 46, 56, 66, 68, 87, 90, 92, 109, 119, 143) named for man who first grew it for pasture
- Phleum pratense L.
- 1896 (45)
- Poa pratensis L. [reported as: Poa pratense L.]
- Herds grass of New England 1876 (92)
- Phleum pratense L.
- Herehoune 1900 (158)
- Marrubium vulgare L.
- Herneh 1879? (46)
- Pennisetum glaucum (L.) R. Br. [reported as: Pennisetum typhoideum Rich.]
- Heron's-bill [Heron's bill, Herons-bill, Heronbill, Herons' bill]
- 1923-1949 (106, 109, 138, 155) from shape of seed pod
- Erodium L'Her. ex Aiton
- 1898-1929 (92, 156, 157)
- Erodium cicutarium (L.) L'Hér. ex Aiton
- Herzgespann (German) 1900 (158)
- Leonurus cardiaca L.
- Heterotheca
- 1900 (158)
- Heterotheca Cass.
- 1913-1937 (5, 97) OK
- Heterotheca subaxillaris (Lam.) Britton & Rusby
- Heuchera 1917 (57)
- Heuchera americana L.
- Hever 1913 (5)
- Avena fatua L.
- Hever grass 1913 (5)
- Arrhenatherum elatius (L.) Beauv. ex J. Presl & C. Presl
- Hexagon beech fern 1913 (5)
- Phegopteris hexagonoptera (Michx.) Fee
[reported as: Dryopteris hexagonoptera (Michx.) C. Chr.]
- Hexaka tawote (Lakota, elk food) 1918?-1970? (121)
- Monarda fistulosa L.
- Hexenkraut (German) 1892-1900 (6, 158)
- Hypericum perforatum L.
- Heydenkorn 1552 (107) Odenwald
- Fagopyrum esculentum Moench
- Heyder's mammillaria [Heyder mammillaria] 1942 (155)
- Mammillaria heyderi Muehlenpfordt
- Heyoka ta pezhuta (Dakota, medicine of the heyoka) 1919 (37)
- Sphaeralcea coccinea (Nutt.) Rydb. ssp. coccinea [reported as: Malvastrum coccineum (Pursh) Gray]
- Hiarteblad (Swedish) 1879 (46)
- Parnassia palustris L.
- Hibelia 1898 (77) Sulphur Grove OH, spikes of flowers resemble Lobelia siphylitica (High lobelia) from a distance
- Campanulastrum americanum (L.) Small
[reported as: Campanula americana L.]
- Hibiscus 1923-1942 (138, 155, 158)
- Hibiscus L.
- Hiccory pignut 1796 (17)
- Juglans cinerea L. [reported as: Juglans oblonga Miller]
- Hickory, Hickory nut, or Hickory tree
- 1806-Present (7, 10, 35, 50, 82, 93, 106, 112, 138, 155, 156, 158) William Clark, from aboriginal hicori
- Carya Nutt. [also reported as: Carya L. Willd., Hicoria Raf.]
- 1770-1928 (6, 14, 34, 40, 41, 46, 92)
- Carya alba (L.) Nutt. ex Ell. [also reported as: Carya tomentosa Nutt., Hicoria alba (L.) Britton, Hicorya alba, Juglans alba L. p.p.]
- 1876 (92)
- Carya laciniosa (Michx. f.) G. Don [reported as: Hicoria sulcata]
- 1919 (37)
- Carya ovata (P. Mill.) K. Koch [reported as: Hicoria ovata (P. Mill.) Britton]
- 1814 (167)
- Juglans L.
- Hickory elm 1900-1929 (5, 156, 157, 158)
- Ulmus thomasii Sargent [also reported as: Ulmus racemosa D. Thomas]
- Hidden dropseed 1942 (155)
- Sporobolus clandestinus (Biehler) A.S. Hitchc.
- Hidden-flower panic grass [Hidden-flowered panic grass] 1885-1903 (66, 90)
- Dichanthelium clandestinum (L.) Gould
[also reported as: Panicum clandestinum L.]
- Hidden-flower vilfa [Hidden flowered vilfa] 1903 (66)
- Sporobolus vaginiflorus (Torr. Gray) Wood [reported as: Vilfa vaginaeflora, Vilfa vaginiflora Torr. ex A. Gray]
- Hiel de tierra (Spanish) 1900 (158)
- Fumaria officinalis L.
- Hi'-e-tran (Kiwomi Keres) 1855 (132)
- Populus L.
- High blackberry 1840-1895 (2, 19, 47, 48, 58)
- Rubus flagellaris Willd. [also reported as: Rubus villosus Aiton ]
- High cranberry 1869-1923 (49, 52, 53, 54, 58, 59, 61, 92, 156)
- Viburnum opulus L.
- High cranberry bark 1876 (92)
- Viburnum opulus L.
- High dandelion 1900-1913 (5, 158)
- Hieracium canadense Michx.
- High geranium 1923 (156)
- Hydrangea arborescens L.
- High goldenrod [High golden-rod]
- 1900 (158)
- Solidago canadensis L.
- 1913 (5)
- Solidago canadensis L. var. scabra Torr. & Gray [reported as: Solidago altissima L.]
- High heal-all [High healall]
- 1913-1923 (5, 156)
- Pedicularis canadensis L.
- 1876 (92)
- Pedicularis canadensis L. ssp. canadensis [reported as: Pedicularis gladiata Michx.]
- High mallow 1894-Present (3, 4, 5, 15, 50, 72, 92, 93, 107, 114, 122, 131, 155, 156, 157, 158)
- Malva sylvestris L. [also reported as: Malva silvestris L. (sic)]
- High pennyroyal 1900-1923 (156, 158)
- Cunila origanoides (L.) Britton
- High veronica 1892 (6)
- Veronicastrum virginicum (L.) Farw. [reported as: Veronica virginica L.]
- High-belia [High belia, High-belia]
- 1892 (6) possibly misapplied
- Lobelia cardinalis L
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