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- Ya'chi (Kiwomi Keres) 1855 (132)
- Zea mays L.
- Yaits 1900 (158)
- Avena sativa L.
- Yam 1750-Present (1, 50, 92, 93, 109, 138, 155, 158, 167) means "to eat" in several dialects of Guinea
- Dioscorea L. [also reported as: Dioscorea (Plum) L.]
- Yam root
- 1818-1828 (7, 10)
- Dioscorea L.
- 1840 (19)
- Dioscorea villosa L.
- Yam-leaf clematis [Yamleaf clematis] 1923 (138)
- Clematis terniflora DC.
[reported as: Clematis dioscoreifolia Levl. & Vaniot]
- Yamnumnugapi (Dakota, to crunch) 1919 (37)
- Celtis occidentalis L.
- Yamp 1900 (158)
- Perideridia gairdneri (Hook. & Arn.) Mathias [reported as: Atenia gairdneri Hook. & Arn.]
- Yámpa (Shoshone) 1806 (35) Meriwether Lewis - spelled year-pah
- Perideridia gairdneri (Hook. & Arn.) Mathias
- Yampah or Yampa
- Present (50)
- Perideridia Reichnb.
- 1942 (155)
- Perideridia gairdneri (Hook. & Arn.) Mathias
- Yankapin bonnets 1923 (156)
- Nelumbo lutea Willd.
- Yankapin or Yoncopin 1900-1929 (106, 156, 157, 158)
- Nelumbo lutea Willd.
- Yankee blackberry 1942-Present (50, 155)
- Rubus frondosus Bigelow
- Yankee corn 1938-1949 (109, 119)
- Zea mays L. ssp. mays
[also reported as: Zea mays L. var. indurata Bailey]
- Yânû Unihye sti (Cherokee) 1886 (102)
- Vitis vulpina L. [reported as: Vitis cordifolia Michx.]
- Ya'-o-ni (Kiwomi Keres) 1855 (132)
- Zea mays L.
- Yard dock 1986 (4)
- Rumex longifolius DC.
[reported as: Rumex domesticus Hartm.]
- Yard grass [Yard-grass, Yardgrass]
- 1936 (93) Neb
- Eleusine Gaertn.
- 1852-1944 (5, 87, 88, 92, 94, 99, 119, 134, 140, 163)
- Eleusine indica (L.) Gaertn.
- Yard-grass [Yardgrass] 1932 (85) SD
- Polygonum aviculare L.
- Yard rush 1912-1923 (5, 62, 156)
- Juncus tenuis Willd.
- Yarr 1900-1923 (5, 156, 158) obsolete by 1923
- Spergula arvensis L.
- Yarrow
- 1814-Present (1, 2, 4, 50, 93, 109, 125, 138, 155, 156, 158, 167)
- Achillea L. [also reported as: Achillea (Valliant) L.]
- 1617-1939 (7, 19, 37, 40, 45, 46, 49, 52, 53, 57, 58, 61, 62, 72, 80, 82, 92, 93, 95, 97, 107, 122, 124, 127, 131, 148, 157, 158)
- Achillea millefolium L.
- 1932-1977 (3, 85, 146)
- Achillea millefolium L. var. occidentalis DC. [also reported as: Achillea lanulosa Nutt., Achillea millefolium L. ssp. lanulosa(Nutt.) Piper]
- Yarroway 1900 (158)
- Achillea millefolium L.
- Yaskobgedek (Chippewa) 1932 (105)
- Pyrola elliptica Nutt.
- Yawroot [Yaw root, Yaw-root] 1828-1923 (5, 6, 7, 49, 53, 55, 58, 92, 156, 158)
- Stillingia sylvatica Garden ex L.
- Yellow 1828 (7)
- Zanthoxylum americanum P. Mill. [reported as: Xanthoxylon fraxineum]
- Yellow alfalfa 1932-Present (3, 50, 85)
- Medicago sativa L. ssp. falcata (L.) Arcang. [also reported as: Medicago falcata L.]
- Yellow alyssum 1900-1913 (5, 158)
- Alyssum alyssoides (L.) L.
- Yellow avens 1899-Present (3, 4, 5, 50, 72, 85, 93, 131, 155, 156, 158)
- Geum aleppicum Jacq. [also reported as: Geum strictum Aiton, Geum aleppicum Jacq. var. strictum (Aiton) Fern.]
- Yellow bachelor's-buttons 1900 (158) double variety
- Ranunculus acris L.
- Yellow balm 1828-1923 (5, 7, 156, 158)
- Lysimachia quadrifolia L.
- Yellow basswood 1900-1929 (156, 157, 158)
- Tilia americana L.
- Yellow bear's-foot [Yellow bears-foot] 1900-1923 (5, 156, 158)
- Smallanthus uvedalius (L.) Mackenzie ex Small [also reported as: Polymnia uvedalia L.]
- Yellow bedstraw 1770-1986 (3, 4, 19, 41, 49, 85, 92, 107, 109, 138, 155, 156, 158)
- Galium verum L. [also reported as: Galium luteum [Lam.]]
- Yellow bell 1905 (101) MT
- Fritillaria pudica (Pursh) Spreng
- Yellow bennet 1900-1923 (156, 158)
- Geum aleppicum Jacq. [also reported as: Geum strictum Aiton]
- Yellow berry 1828-1876 (7, 92)
- Podophyllum peltatum L.
- Yellow bird's nest 1913 (5)
- Monotropa hypopithys L. [reported as: Hypopitys americana (DC.) Small]
- Yellow bluestem Present (50)
- Bothriochloa ischaemum (L.) Keng var. songarica (Rupr. ex Fisch. & C.A. Mey.) Celarier & Harlan
- Yellow bristle grass [Yellow bristle-grass] 1936 (143) Quebec
- Pennisetum glaucum (L.) R. Br. [reported as: Setaria lutescens (Weigel) F.T. Hubbard]
- Yellow bristly foxtail 1913 (5)
- Pennisetum glaucum (L.) R. Br. [reported as: Chaetochloa glauca (L.) Scribn.]
- Yellow broomrape [Yellow broom rape] 1932 (85) SD
- Orobanche fasciculata Nutt. [reported as: Thalesia fasciculata (Nutt.) Britton]
- Yellow camomile [Yellow chamomile]
- 1932 (1)
- Anthemis L. [reported as: Cota J. Gay.]
- 1913-1986 (3, 4, 5, 138, 156)
- Anthemis tinctoria L.
- Yellow cancer-root [Yellow cancer root] 1899-1929 (5, 131, 156, 157, 158)
- Orobanche fasciculata Nutt. [also reported as: Thalesia fasciculata (Nutt.) Britton]
- Yellow centaurium 1942 (155)
- Centaurea solstitialis L.
- Yellow chestnut oak 1900-1986 (4, 5, 156, 157, 158)
- Quercus muehlenbergii Engelm. [also reported as: Quercus acuminata (Michx.) Sarg.]
- Yellow cleavers 1876-1923 (92, 156, 158)
- Galium verum L.
- Yellow cleome 1913-1986 (4, 5, 93)
- Cleome lutea Hook.
- Yellow clover
- 1840-1913 (19, 80)
- Trifolium campestre Schreber. [also reported as: Trifolium procumbens L.]
- 1900 (158)
- Trifolium dubium Sibth.
- Yellow coralroot [Yellow coral root, Yellow coral-root]
- 1900-1936 (5, 93, 157)
- Corallorrhiza striata Lindl. var. striata [also reported as: Corallorrhiza ochroleuca Rydb.]
- Present (50)
- Corallorrhiza trifida Chat.
- Yellow corydalis 1913?-1923 (5, 156)
- Corydalis flavula (Raf.) DC. [also reported as: Capnoides flavulum (Raf.) Kuntze]
- Yellow cottonwood
- 1900-1923 (5, 156, 158)
- Populus deltoides Bartr. ex Marsh.
- 1895 (130) SD
- Populus deltoides Bartr. ex Marsh. ssp. monilifera (Aiton) Eckenwalder [reported as: Populus monilifera Aiton]
- Yellow cress [Yellow-cress, Yellowcress]
- 1936 (93) Neb
- Barbarea Aiton f. [reported as: Barbarea R. Br.]
- 1913-1923 (5, 156)
- Barbarea vulgaris Aiton f. [also reported as: Barbarea barbarea (L.) MacM., Barbarea vulgaris R.Br.]
- 1900-1929 (157, 158)
- Ranunculus acris L.
- 1986-Present (4, 50)
- Rorippa Scop.
- 1897-1986 (3, 4, 145)
- Rorippa sessiliflora (Nutt.) A.S. Hitchc. [also reported as: Nasturtium sessiliflorum Nutt.]
- 1897-1932 (85, 145)
- Rorippa sinuata (Nutt.) A.S. Hitchc. [also reported as: Nasturtium sinuatum Nutt., Radicula sinuata (Nutt.) Greene]
- 1895-1923 (5, 15, 156)
- Rorippa sylvestris (L.) Bess. [also reported as: Nasturtium sylvestre R. Br., Radicula sylvestris (L.) Druce]
- Yellow currants 1806 (35)
- Ribes aureum Pursh
- Yellow cut-leaf mignonette [Yellow cut-leaved mignonette] 1913 (5)
- Reseda lutea L.
- Yellow cyperus 1907-1923 (5, 72, 156) IA
- Cyperus flavescens L.
- Yellow-daisy [Yellow daisy, Yellow daisies]
- 1891 (79) Northeast US
- Ranunculus acris L.
- 1892-1929 (5, 62, 73, 156, 157, 158)
- Rudbeckia hirta L.
- 1949 (109)
- Rudbeckia hirta L. var. pulcherrima Farw. [reported as: Rudbeckia serotina Nutt.]
- 1930 (82) IA
- Rudbeckia subtomentosa Pursh
- Yellow dock 1869-1987 (5, 6, 40, 48, 49, 52, 53, 57, 58, 61, 62, 64, 69, 80, 92, 97, 156, 157, 158)
- Rumex crispus L.
- Yellow dog-fennel 1912 (62) IN
- Dyssodia papposa (Vent.) A.S. Hitchc. [reported as: Boebera papposa (Vent.) Rydb.]
- Yellow dotted hawthorn 1942 (155)
- Crataegus punctata Jacq.
[reported as: Crataegus punctata Jacq. var. aurea Aiton]
- Yellow downy lady's-slipper [Yellow downy lady's slipper] 1936 (93) Neb
- Cypripedium parviflorum Salisb.
- Yellow dwarf sedge 1903 (66)
- Cyperus flavescens L.
- Yellow eriogonum 1899-1942 (5, 93, 131, 155)
- Eriogonum flavum Nutt.
- Yellow European lady's-slipper [Yellow European ladyslipper] 1942 (155)
- Cypripedium parviflorum Salisb. var. pubescens (Willd.) Knight [reported as: Cypripedium pubescens Willd. var. pubescens]
- Yellow evening-primrose [Yellow eveningprimrose]
- 1977 (3)
- Calylophus serrulatus (Nutt.) Raven
- 1942-Present (50, 155)
- Oenothera flava (A. Nels.) Garrett
- Present (50)
- Oenothera flava (A. Nels.) Garrett ssp. flava
- Yellow false garlic [Yellow falsegarlic] 1913-1942 (5, 93, 97, 155)
- Nothoscordum bivalve (L.) Britt.
- Yellow false indigo 1913 (5)
- Baptisia bracteata Muhl. ex Ell.
- Yellow false mallow 1907-1937 (5, 72, 97, 156)
- Malvastrum hispidum (Pursh) Hochr. [also reported as: Malvastrum angustum Gray]
- Yellow false oat 1913 (5, 68) Ottawa
- Trisetum flavescens (L.) Beauv.
- Yellow fawn-lily [Yellow fawnlily] Present (50)
- Erythronium rostratum C. B. Wolf
- Yellow field sorrel 1913-1930 (80, 82) IA
- Oxalis stricta L.
- Yellow flag 1900-1923 (5, 156, 158)
- Iris pseudacorus L.
- Yellow flag iris [Yellowflag iris] 1923-1942 (138, 155)
- Iris pseudacorus L.
- Yellow flameflower [Yellow flame flower] 1937 (124) TX
- Talinum aurantiacum Engelm.
- Yellow flatsedge Present (50)
- Cyperus flavescens L.
- Yellow flax
- 1892 (6)
- Linaria vulgaris P. Mill. [reported as: Linaria vulgaris Hill]
- 1932-1936 (1, 93) Neb
- Linum L. [also reported as: Cathartolinum Reichenb.]
- 1852-1930 (47, 125)
- Linum rigidum Pursh
- 1932 (85) SD
- Linum rigidum Pursh var. rigidum [reported as: Cathartolinum rigidum (Pursh) Small]
- 1926 (98) Neb
- Linum sulcatum Riddell
- 1932 (85) SD
- Linum sulcatum Riddell var. sulcatum [reported as: Cathartolinum sulcatum (Riddell) Small]
- Yellow-flower [Yellow flower] 1900-1929 (5, 157)
- Sinapis arvensis L.
- Yellow foxtail [Yellow fox tail] 1852-1977 (3, 5, 56, 93, 94, 99, 111, 119, 129, 134, 143, 145, 155, 163)
- Pennisetum glaucum (L.) R. Br. [also reported as: Chaetochloa lutescens (Weigel) Stuntz, Ixophorus glaucus (L.) Nash, Setaria glauca (L.) Beauv., Setaria lutescens (Weigel) F.T. Hubbard]
- Yellow fritillary 1942-Present (50, 155)
- Fritillaria pudica (Pursh) Spreng
- Yellow fumewort Present (50)
- Corydalis flavula (Raf.) DC.
- Yellow gentian 1923 (156)
- Gentiana alba Muhl. ex Nutt. [reported as: Gentiana flavida Gray]
- Yellow giant hyssop Present (50)
- Agastache nepetoides (L.) Kuntze
- Yellow ginseng 1828-1929 (6, 7, 64, 156, 157, 158)
- Caulophyllum thalictroides (L.) Michx.
- Yellow goat's-beard [Yellow goat's beard, Yellow goats'-beard, Yellow goats-beard] 1900-1936 (5, 72, 93, 95, 156, 158)
- Tragopogon pratensis L.
- Yellow gowan [Yellow gowan, Yellow gowans]
- 1876 (92)
- Ranunculus L.
- 1900-1929 (5, 156, 157, 158) Scotland
- Ranunculus acris L.
- 1923 (156)
- Ranunculus bulbosus L.
- 1913-1923 (5, 107, 156)
- Ranunculus repens L.
- 1900-1929 (5, 64, 69, 156, 157, 158)
- Taraxacum officinale G.H. Weber ex Wiggers [also reported as: Leontodon taraxacum L.]
- Yellow grape 1828 (7)
- Possibly, Vitis aestivalis Michx. [reported as: Vitis fulva Raf. ]
- Yellow harlequin 1977-1986 (3, 4)
- Corydalis flavula (Raf.) DC.
- Yellow honeysuckle
- 1900-1923 (156, 158) misapplied
- Lonicera dioica L.
- 1890-Present (4, 5, 50, 97, 113, 138, 155, 156)
- Lonicera flava Sims.
- Yellow hop clover [Yellow hop-clover] 1923 (156)
- Medicago lupulina L.
- Yellow horse-gentian [Yellow horse gentian] 1907-1923 (5, 72, 156) IA
- Triosteum angustifolium L.
- Yellow Indian grass [Yellow Indiangrass] 1942-1944 (140, 155)
- Sorghastrum nutans (L.) Nash
- Yellow Indian paintbrush Present (50)
- Castilleja flava S. Wats.
- Yellow Indian shoe [Yellow Indian-shoe] 1900 (158)
- Cypripedium reginae Walt. [reported as: Cypripedium hirsutum Mill]
- Yellow iris 1919-1977 (3, 107)
- Iris pseudacorus L.
- Yellow ironweed [Yellow iron-weed] 1912-1930 (5, 62, 82)
- Verbesina alternifolia (L.) Britton ex Kearney [also reported as: Actinomeris alternifolia(L.) DC., Ridans alternifolius (L.) Britton, Verbesina alternifolia L.]
- Yellow jasmine 1785 (8)
- Campsis radicans (L.) Seem. ex Bureau [reported as: Bignonia radicans L.]
- Yellow jewelweed [Yellow jewel-weed] 1900-1929 (156, 157)
- Impatiens pallida Nutt.
- Yellow lady''s-slipper [Yellow ladies' slipper, Yellow lady's slipper, Yellow ladies'-slipper]
- 1828-Present (5, 7, 50, 85, 97, 156, 157)
- Cypripedium parviflorum Salisb. [also reported as: Cypripedium calceolus L. var. parviflorum (Salisb.) Fern., Cypripedium luteum]
- 1977-Present (3, 50)
- Cypripedium parviflorum Salisb. var. pubescens (Willd.) Knight [also reported as: Cypripedium calceolus L. var. planipetalum Fern., Cypripedium pubescens Willd. var. pubescens]
- 1900-1908 (64, 158)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill]
- Yellow lanterns 1923 (156)
- Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi [reported as: Nuphar advena]
- Yellow leaf-cup [Yellow leafcup] 1840-1942 (5, 19, 52, 54, 72, 155, 158)
- Smallanthus uvedalius (L.) Mackenzie ex Small [also reported as: Polymnia uvedalia L.]
- Yellow lily 1949 (109)
- Lilium canadense L.
- Yellow lily-root [Yellow lily root] 1876 (92)
- Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi [reported as: Nuphar advena Aiton f.]
- Yellow linden 1923 (138)
- Tilia americana L. [reported as: Tilia flavescens (A.Braun)]
- Yellow locust 1876-1930 (5, 6, 49, 74, 92, 106, 156, 157, 158)
- Robinia pseudoacacia L. [also reported as: Robinia pseudacacia L., Robinia pseudo-acacia L.]
- Yellow loosestrife Present (50)
- Lysimachia L.
- Yellow lotus 1919-1923 (37, 156)
- Nelumbo lutea Willd.
- Yellow lucerne 1913 (68) Ottawa
- Medicago sativa L. ssp. falcata (L.) Arcang.
[reported as: Medicago falcata L.]
- Yellow lysimachus of Virginia 1671 (46) Josselyn
- Oenothera biennis L.
- Yellow marsh-marigold [Yellow marsh marigold]
- Present (50)
- Caltha palustris L.
- Present (50)
- Caltha palustris L. var. palustris
- Yellow melilot 1892-1929 (5, 6, 45, 49, 53, 129, 156, 157, 158)
- Melilotus officinalis (L.) Lam. [also reported as: Melilotus officinalis Willd.]
- Yellow melilot clover 1840-1922 (19, 49, 53, 92)
- Melilotus officinalis (L.) Lam. [also reported as: Melilotus vulgaris Eat. & Wright]
- Yellow mignonette 1923-Present (50, 155, 156)
- Reseda lutea L.
- Yellow milkweed [Yellow milk-weed] 1892-1929 (5, 64, 73, 156, 157, 158)
- Asclepias tuberosa L.
- Yellow millet 1900-1929 (5, 157, 158) verbal corruption of melilot
- Melilotus officinalis (L.) Lam.
- Yellow mocassin-flower [Yellow mocassin flower, Yellow moccasin flower]
- 1913-1923 (5, 156)
- Cypripedium parviflorum Salisb.
- 1900-1908 (64, 158)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill]
- Yellow monkey-flower 1900-1936 (85, 93, 95, 157)
- Mimulus glabratus Kunth var. jamesii (Torr. & Gray ex Benth.) Gray [also reported as: Mimulus geyer Torr.]
- Yellow mustard 1876-1929 (6, 53, 69, 92, 157)
- Sinapis alba L. [also reported as: Brassica alba Hook.]
- Yellow nelumbo 1828-1919 (2, 7, 63, 107)
- Nelumbo lutea Willd. [also reported as: Nelumbium luteum Juss. (Possibly this species), Nelumbium luteum Willd.]
- Yellow neptunia 1942 (155)
- Neptunia lutea (Leavenworth) Benth.
- Yellow nightshade 1923 (156)
- Solanum rostratum Dunal
- Yellow Noah's ark [Yellow Noah's-ark] 1900-1908 (64, 158)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill]
- Yellow nodding ladies'-tresses Present (50)
- Spiranthes ochroleuca (Rydb.) Rydb.
- Yellow nut-grass [Yellow nut grass] 1907-1923? (5, 62, 72, 156)
- Cyperus esculentus L.
- Yellow nut-sedge [Yellow nutsedge] 1977 (3)
- Cyperus esculentus L.
- Yellow oak
- 1923-1930 (82, 156)
- Quercus ellipsoidalis E.J. Hill
- 1857-1937 (2, 5, 20, 82, 93, 95, 97, 113, 156, 157, 158)
- Quercus muehlenbergii Engelm. [also reported as: Quercus acuminata (Michx.) Houba, Quercus prinus acuminata (Quercus prinus var. acuminata Michx.)]
- 1907 (72) IA
- Quercus velutina Lam.
- Yellow oat [Yellow oats] or Yellow oat grass [Yellow oat-grass, Yellow oatgrass] 1876-Present (3, 5, 45, 50, 56, 66, 68, 92)
- Trisetum flavescens (L.) Beauv. [reported as: Avena flavescens L., Trisetum pratense Pers.]
- Yellow orthocarpus 1899 (5, 131)
- Orthocarpus luteus Nutt.
- Yellow owl clover [Yellow owl's-clover, Yellow owlclover] 1942-Present (50, 155)
- Orthocarpus luteus Nutt.
- Yellow oxalis 1930 (82) IA
- Oxalis corniculata L.
- Yellow ox-eye daisy 1913-1923 (5, 156)
- Rudbeckia hirta L.
- Yellow oxytropis 1913 (5)
- Oxytropis campestris (L.) DC.
- Yellow painted-cup [Yellow paintedcup] 1942 (155)
- Castilleja flava S. Wats.
- Yellow panic grass 1885-1903 (66, 90)
- Dichanthelium xanthophysum (Gray) Freckmann
[also reported as: Panicum xanthophysum A. Gray]
- Yellow parilla 1870-1929 (5, 6, 48, 49, 53, 57, 61, 64, 92, 130, 156, 157, 158)
- Menispermum canadense L.
- Yellow passion-flower [Yellow passionflower, Yellow passion flower] 1840-Present (5, 19, 48, 50, 122, 138, 155)
- Passiflora lutea L.
- Yellow-pea [Yellow pea]
- 1936 (93) Neb
- Thermopsis R. Br. ex Aiton f.
- 1913-1986 (4, 5)
- Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richards. [also reported as: Thermopsis rhombifolia (Nutt.) Richards]
- Yellow phlox
- 1932-1936 (1, 93) Neb
- Erysimum L. [also reported as: Cheirinia Link.]
- 1900-1937 (85, 93, 97, 157, 158)
- Erysimum capitatum (Dougl. ex Hook.) Greene var. capitatum [also reported as: Cheirinia aspera (DC..) Britton, Erysimum asperum (Nutt.) DC.]
- Yellow pileweed [Yellow pile-weed] 1892 (6)
- Ranunculus acris L.
- Yellow pimpernel 1907-Present (4, 5, 50, 72, 85, 97, 156)
- Taenidia integerrima (L.) Drude
- Yellow pine
- 1856-1932 (1, 2, 147)
- Pinus echinata P. Mill. [also reported as: Pinus mitis Michx.]
- 1857-1910 (75, 101, 108, 135, 161)
- Pinus ponderosa P.& C. Lawson
- 1890-1895 (113, 130) Neb SD
- Pinus ponderosa P.& C. Lawson [also reported as: Pinus ponderosa scopulorum Engelm.]
- Yellow pinesap [Yellow pine-sap] 1923 (156)
- Monotropa hypopithys L.
- Yellow plum 1919 (107)
- Prunus americana Marsh.
- Yellow-plums [Yellow plums] 1828-1930 (7, 82) IA
- Diospyros virginiana L.
- Yellow pond-lily [Yellow pond lily]
- 1818-1932 (1, 10, 13, 15, 63)
- Nuphar Sm.
- Present (50)
- Nuphar lutea (L.) Sm.
- 1840-Present (50, 48, 57, 72, 74, 85, 92, 93, 97, 103, 107, 120, 121, 122, 156, 157, 158)
- Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi [also reported as: Nuphar advena Aiton f., Nymphaea advena Soland., Nuphar microcarpum (Miller & Standl.) Standl.]
- 1900-1936 (93, 158)
- Nymphaea L. [also reported as: Nymphaea (Tourn.) L.]
- Yellow prairie violet 1913-1986 (3, 4, 5, 98, 156)
- Viola nuttallii Pursh
- Yellow primrose 1932 (85) SD
- Calylophus serrulatus (Nutt.) Raven [reported as: Meriolix serrulata (Nutt.) Walp.]
- Yellow procumbent wood sorrel 1907-1913? (5, 72) IA
- Oxalis corniculata L. [also reported as: Xanthoxalis corniculata (L.) Small]
- Yellow puccoon 1913?-1923 (5, 156)
- Lithospermum incisum Lehm. [also reported as: Lithospermum angustifolium Michx., Lithospermum linearifolium Goldie]
- Yellow rabbitbrush
- Present (50)
- Chrysothamnus viscidiflorus (Hook.) Nutt.
- Present (50)
- Chrysothamnus viscidiflorus (Hook.) Nutt. ssp. viscidiflorus var. viscidiflorus
- Yellow-rocket [Yellowrocket, Yellow rocket]
- 1849-Present (50, 13)
- Barbarea Aiton f. [also reported as: Barbarea R. Br.]
- 1895-1900 (5, 15, 72, 85, 107, 157)
- Barbarea vulgaris Aiton f. [also reported as: Barbarea barbarea (L.) MacM., Barbarea vulgaris R.Br.]
- Yellow rockrose [Yellow rock-rose] 1923 (156)
- Dasiphora floribunda (Pursh) Kartesz [reported as: Potentilla fruticosa L., Dasiphora fruticosa (L.) Rydb.]
- Yellow root [Yellow root, Yellow-root] 1876-1929 (92, 157, 158)
- Celastrus scandens L.
- Yellow-rose [Yellow rose] 1932 (1)
- Dasiphora Raf.
- Yellow salsify
- Present (50)
- Tragopogon dubius Scop.
- 1932 (85) SD
- Tragopogon pratensis L.
- Yellow sarsaparilla 1828-1929 (5, 6, 7, 64, 92, 156, 157, 158)
- Menispermum canadense L.
- Yellow saxifrage 1932 (1)
- Saxifraga L. [reported as: Leptasea Haw.]
- Yellow Scouler's willow [Yellow Scouler willow] 1942 (155)
- Salix scouleriana Barr. [reported as: Salix scouleriana Barratt ex Hook. var. flavescens (Nutt.) J.K. Henry]
- Yellow scurvy-grass 1929 (157)
- Barbarea vulgaris Aiton f. [reported as: Barbarea barbarea (L.) MacM.]
- Yellow sensitive brier [Yellow sensitive briar] 1937 (122, 124) TX
- Neptunia lutea (Leavenworth) Benth.
- Yellow sorrel
- 1936 (93) Neb
- Oxalis L. [reported as: Xanthoxalis Small.]
- 1896 (76) CA
- Oxalis corniculata L.
- Yellow spear grass [Yellow spear-grass] 1901 (94)
- Poa canbyi (Scribn.) Piper [reported as: Poa lucida Vasey]
- Yellow spiderflower
- 1942-Present (50, 155)
- Cleome lutea Hook.
- 1942-Present (50, 155)
- Cleome lutea Hook. var. lutea
- Yellow Spring bedstraw Present (50)
- Galium verum L.
- Yellow star [Yellow-star] 1828-1929 (5, 7, 92, 156, 157, 158)
- Helenium autumnale L.
- Yellow star-grass [Yellow stargrass] 1900-1977 (3, 5, 93, 97, 156, 157, 158)
- Hypoxis hirsuta (L.) Cov.
- Yellow star-thistle [Yellow star thistle] 1900-Present (4, 50, 106, 157)
- Centaurea solstitialis L.
- Yellow stonecrop Present (50)
- Sedum nuttallianum Raf.
- Yellow strawberry 1900 (158)
- Duchesnea indica (Andr.) Focke
- Yellow succory 1783 (46) Manasseh Cutler
- Hieracium canadense Michx.
- Yellow suckling 1913 (5)
- Trifolium dubium Sibth.
- Yellow suckling clover 1896 (45)
- Trifolium dubium Sibth. [reported as: Trifolium filiforme]
- Yellow sundrops Present (50)
- Calylophus serrulatus (Nutt.) Raven
- Yellow sweet clover [Yellow sweet-clover, Yellow sweetclover] 1892-Present (3, 4, 5, 6, 50, 53, 62, 80, 82, 85, 93, 95, 97, 106, 109, 122, 124, 129, 145, 155, 156, 157, 158)
- Melilotus officinalis (L.) Lam. [also reported as: Melilotus officinalis Willd., Melilotus officinalis (L.) Pallas]
- Yellow taenidia 1942-1977 (3, 155)
- Taenidia integerrima (L.) Drude
- Yellow Texas star 1937 (122) TX
- Lindheimera texana Gray & Engelm.
- Yellow toadflax [Yellow toad flax, Yellow toad-flax] 1899-1923 (5, 95, 131, 56, 157, 158)
- Linaria vulgaris P. Mill. [also reported as: Linaria linaria (L.) Karst.]
- Yellow trefoil
- 1911-1939 (68, 95, 109, 146)
- Medicago lupulina L.
- 1900-1913 (5, 158)
- Trifolium dubium Sibth.
- Yellow umbel [Yellow umbil, Yellow umble]
- 1828 (7)
- Cypripedium parviflorum Salisb. [reported as: Cypripedium luteum]
- 1900-1908 (64, 158)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill]
- Yellow vetchling 1977-1986 (3, 4)
- Lathyrus ochroleucus Hook.
- Yellow violet
- 1840-1933 (19, 46, 127)
- Viola pubescens Aiton
- 1932 (85) SD
- Viola pubescens Aiton var. pubescens [reported as: Viola eriocarpa Schwein.]
- Yellow water buttercup Present (50)
- Ranunculus flabellaris Raf.
- Yellow water cress 1828-1923 (7, 92, 156)
- Rorippa palustris (L.) Bess [also reported as: Nasturtium palustre DC]
- Yellow water crowfoot [Yellow water crow foot, Yellow water crow-foot] 1895-1937 (2, 5, 63, 72, 93, 97, 131, 156, 158)
- Ranunculus flabellaris Raf. [also reported as: Ranunculus delphiniifolius Torr., Ranunculus multifidus Pursh]
- Yellow water flag [Yellow water-flag] 1900-1923 (5, 156, 158)
- Iris pseudacorus L.
- Yellow water skegs [Yellow water-skegs] 1900-1913 (5, 158)
- Iris pseudacorus L.
- Yellow water-cress [Yellow water cress]
- 1932 (1, 93) Neb
- Rorippa Scop. [also reported as: Radicula Hill]
- 1900-1929 (157, 158)
- Rorippa palustris (L.) Bess
- Yellow waterlily [Yellow water lily, Yellow water lily, Yellow water lilly]
- 1828 (7)
- Possibly, Nelumbo lutea Willd. [reported as: Nelumbium luteum Juss.]
- 1919 (107)
- Nuphar lutea (L.) Sm. [reported as: Nuphar luteum Sibth. & Sm.]
- 1840-1977 (3, 19, 46, 76, 92, 101, 106, 124, 157)
- Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi [also reported as: Nuphar advena Aiton f., Nymphaea advena Soland., Nuphar lutea (L.) Sibth. & Sm. ssp. macrophylla (Small) Beal]
- 1977 (3)
- Nuphar lutea (L.) Sm. ssp. variegata (Dur.) E.O. Beal
- Yellow whitlow-wort [Yellow whitlowwort] 1977-1986 (3, 4)
- Draba nemorosa L.
- Yellow wide-lip orchid [Yellow widelip orchid] Present (50)
- Liparis loeselii (L.) L.C. Rich [reported as: Liparis liliifolia (L.) L.C. Rich]
- Yellow wild buckwheat 1986 (4)
- Eriogonum flavum Nutt.
- Yellow wild pea 1932 (85) SD
- Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richards.
- Yellow wild rye [Yellow wildrye] Present (50)
- Leymus flavescens (Scribn. & J.G. Sm.) Pilger
- Yellow willow
- 1840-1910 (19, 135, 158)
- Salix alba L. [also reported as: Salix alba L. ssp. vitellina (L.) Arcang., Salix vitellina L.]
- 1932-Present (1, 4, 50, 85, 155)
- Salix lutea Nutt.
- 1895 (130) SD
- Salix scouleriana Barr. [reported as: Salix flavescens Nutt.]
- Yellow wood sorrel [Yellow wood-sorrel]
- 1932 (1)
- Oxalis L. [reported as: Xanthoxalis Small.]
- 1770-1937 (2, 41, 97, 145)
- Oxalis corniculata L. [also reported as: Xanthoxalis corniculata (L.) Small]
- 1840-1986 (3, 4, 19, 37, 62, 122, 127, 145, 156)
- Oxalis stricta L. [also reported as: Oxalis corniculata var. stricta Savar., Xanthoxalis stricta (L.) Small]
- Yellow wood-cress 1900-1929 (156, 157, 158)
- Rorippa palustris (L.) Bess
- Yellow-bark oak [Yellow bark oak, Yellow-barked oak] 1900-1930 (5, 82, 156, 157, 158) galls are called oak-plums
- Quercus velutina Lam.
- Yellow-bean [Yellow bean] 1939 (148) CO
- Thermopsis R. Br. ex Aiton f.
- Yellow-berry elder [Yellow-berried elder] 1932 (85) SD
- Sambucus racemosa L. var. racemosa [reported as: Sambucus pubens Michx.]
- Yellow-caul 1900-1929 (157, 158)
- Ranunculus acris L.
- Yellowdicks
- Present (50)
- Helenium amarum (Raf.) H. Rock
- Present (50)
- Helenium amarum (Raf.) H. Rock var. amarum
- Present (50)
- Helenium amarum (Raf.) H. Rock var. badium ( Gray ex S. Wats.) Waterfall
- Yellow-eyed grass 1923 (156)
- Hypoxis hirsuta (L.) Cov.
- Yellow-eyed water grass 1840 (19)
- Heteranthera dubia (Jacq.) MacM. [reported as: Schollera graminifolia W., Heteranthera graminea (Michx.) Vahl]
- Yellow-flower horse-gentian [Yellow-flowered horse-gentian] 1986 (4)
- Triosteum angustifolium L.
- Yellow-flower leaf-cup [Yellow-flowered leaf-cup] 1923 (156)
- Smallanthus uvedalius (L.) Mackenzie ex Small [reported as: Polymnia uvedalia L.]
- Yellow-flower locoweed [Yellowflower locoweed] Present (50)
- Oxytropis monticola Gray
- Yellow-flower stonecrop [Yellow-flowered stonecrop] 1820 (38)
- Sedum lanceolatum Torr. [reported as: Sedum stenopetalum Pursh]
- Yellow-fruit horse-gentian [Yellowfruit horse-gentian] Present (50)
- Triosteum angustifolium L.
- Yellow-fruit sedge [Yellowfruit sedge, Yellow-fruited sedge]
- 1913-Present (3, 5, 50)
- Carex annectens (Bickn.) Bickn. [also reported as: Carex annectens Bickn. var. xanthocarpa (Bickn.) Wieg.]
- 1977 (3)
- Carex annectens Bickn. var. annectens
- 1907 (72) IA
- Possibly, Carex bicknellii Britt. [reported as: Carex xanthocarpa]
- Yellow-grass [Yellow grass] 1840 (19)
- Cyperus flavescens L.
- Yellow-green painted-cup [Yellowgreen paintedcup] 1942 (155)
- Castilleja sulphurea Rydb. [reported as: Castilleja luteovirens Rydb.]
- Yellow-hair beard grass [Yellow-haired beard-grass] 1913-1936 (5, 93, 99)
- Andropogon gerardii Vitman [also reported as: Andropogon chrysocomus Nash.]
- Yellow-hair lyme grass [Yellow-haired lyme-grass] 1901 (94)
- Leymus flavescens (Scribn. & J.G. Sm.) Pilger [reported as: Elymus flavescens Scribn. & J.G. Sm.]
- Yellow-hair paspalum [Yellow-haired paspalum] 1913 (5)
- Paspalum setaceum Michx. [reported as: Paspalum debile Michx.]
- Yellowish corydalis 1895 (2)
- Corydalis flavula (Raf.) DC.
- Yellowish gentian 1907-1923 (5, 72, 156)
- Gentiana alba Muhl. ex Nutt. [also reported as: Gentiana flavida Gray, Dasystephana flavida (Gray) Britton]
- Yellowish-white gentian [Yellowish white gentian] 1876-1898 (49, 92)
- Gentiana alba Muhl. ex Nutt. [also reported as: Gentiana ochroleuca Froel. (Possibly, Gentiana alba)]
- Yellow-puff 1986-Present (4, 50)
- Neptunia lutea (Leavenworth) Benth.
- Yellow-rod 1900-1929 (157, 158)
- Linaria vulgaris P. Mill. [also reported as: Linaria linaria (L.) Karst.]
- Yellow-root water dock [Yellow-rooted water dock, Yellow rooted water dock] 1876-1904 (49, 69, 92)
- Possibly Rumex orbiculatus Gray var. borealis Rech. f. [also reported as: Rumex britannica L.]
- Yellows
- 1828-1913 (5, 7)
- Cypripedium parviflorum Salisb. [also reported as: Cypripedium luteum]
- 1900-1908 (64, 158)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill]
- 1828 (7)
- Ranunculus acris L.
- Yellow-sedge bluestem [Yellowsedge bluestem] 1942 (155)
- Andropogon virginicus L.
- Yellowseed [Yellow seed, Yellow-seed] 1913-1939 (5, 156, 148)
- Lepidium campestre (L.) Aiton f. [also reported as: Lepidium campestre (L.) R. Br.]
- Yellow-seed false pimpernel [Yellowseed false pimpernel]
- Present (50)
- Lindernia dubia (L.) Pennell
- Present (50)
- Lindernia dubia (L.) Pennell var. anagallidea (Michx.) Cooperrider
- Present (50)
- Lindernia dubia (L.) Pennell var. dubia
- Yellow-seed mustard 1840 (19)
- Sinapis alba L.
- Yellow-spine thistle [Yellow spine thistle, Yellowspine thistle, Yellow spined thistle, Yellow-spined thistle] 1899-Present (3, 4, 5, 50, 93, 97)
- Cirsium ochrocentrum Gray [also reported as: Carduus ochrocentrus (Gray) Green]
- Yellow-stem white willow [Yellowstem white willow] 1942-1986 (4, 155)
- Salix alba L. [also reported as: Salix alba L. ssp. vitellina (L.) Arcang., Salix alba L. var. vitellina (L.) Stokes]
- Yellow-throat shooting-star [Yellowthroat shootingstar] 1942 (155)
- Dodecatheon pulchellum (Raf.) Merr. ssp. pulchellum [reported as: Dodecatheon salinum A. Nels.]
- Yellowtop [Yellow top]
- 1915 (111) Neb
- Calamagrostis canadensis (Michx.) Beauv.
- 1913 (5)
- Calamagrostis stricta (Timm) Koel. ssp. stricta [reported as: Calamagrostis neglecta (Ehrh.) Gaertn.]
- 1930-1937 (106, 122, 124) TX
- Verbesina encelioides (Cav.) Benth. & Hook. f. ex Gray
- Yellowtops
- Present (50)
- Flaveria Juss.
- 1892 (73, 76)
- Solidago L.
- Yellow-weed [Yellow weed]
- 1893-1923 (21, 156)
- Amphiachyris dracunculoides (DC.) Nutt.
- 1828-1876 (7, 92)
- Ranunculus acris L.
- 1913 (5)
- Ranunculus bulbosus L.
- 1894 (75) VT
- Solidago L.
- 1896-1923 (76, 156, 158) Sulphur Grove OH
- Solidago canadensis L.
- 1913-1923 (5, 156)
- Solidago canadensis L. var. scabra Torr. & Gray
[also reported as: Solidago altissima L.]
- Yellow-wood [Yellow wood]
- 1821 (12)
- Maclura Nutt.
- 1818-1923 (5, 7, 10, 20, 34, 156, 158)
- Maclura pomifera (Raf.) Schneid. [also reported as: Maclura aurantiaca Nutt., Toxylon aurantiacum Raf., Toxylon pomiferum Raf.]
- 1892-1923 (6, 49, 156, 157, 158)
- Zanthoxylum americanum P. Mill. [also reported as: Xanthoxylum americanum P. Mill.]
- Yellow-wool amorpha [Yellowwool amorpha] 1942 (155)
- Amorpha fruticosa L. [reported as: Amorpha croceo-lanata P.W. S. Wats.]
- Yen (Chinese, ancient) 1886 (110)
- Possibly, Morus alba L.
- Yerba buena (Sp.) 1900 (158)
- Mentha spicata L.
- Yerba colorado 1870 (103) AZ
- Rumex L.
- Yerba de la feridura (Spanish) 1900 (158)
- Stachys L.
- Yerba del pasmore (Spanish) 1896 (76) CA
- Erigeron annuus (L.) Pers.
- Yerba de tajo [Yerba-de-tajo, Yerbadetajo] (Spanish)
- 1932 (1)
- Eclipta L.
- 1913?-1986 (3, 4, 5, 93, 97, 122, 155)
- Eclipta prostrata (L.) L. [also reported as: Eclipta alba (L.) Hassk., Verbesina alba L.]
- Yerba de vibrona (Spanish) 1937 (122) TX
- Ibervillea lindheimeri (Gray) Greene
- Yerba del buey 1930-1937 (106, 122, 124) Southern US
- Cissus trifoliata (L.) L. [also reported as: Cissus incisa (Nutt.) Des Moul.]
- Yerba del Manza 1919-1922 (52, 53)
- Anemopsis californica (Nutt.) Hook. & Arn.
- Yerba del negro (Spanish) 1894 (150) NM
- Sphaeralcea angustifolia (Cav.) G. Don
- Yerba del vibora (Spanish) 1896 (76) CA
- Daucus pusillus Michx.
- Yerba Mansa [Yerbamansa]
- 1986-Present (4, 50)
- Anemopsis Hook. & Arn.
- 1898-Present (50, 49, 53, 57, 155, 158)
- Anemopsis californica (Nutt.) Hook. & Arn. [also reported as: Houttoynia californica Benth. & Hook.]
- Yerba parda (Spanish) 1894 (150) NM
- Helianthus ciliaris DC.
- Yerba-de-San-Juan 1923 (156)
- Achillea millefolium L.
- Yerrow 1900 (158)
- Achillea millefolium L.
- Yethering bells 1879 (46)
- Orthilia secunda (L.) House [reported as: Pyrola secunda L.]
- Yevering bells 1879 (46)
- Orthilia secunda (L.) House [reported as: Pyrola secunda L.]
- Ying-sou (Chinese) 1886 (110)
- Papaver L.
- Yorkshire fog 1896-1913 (5, 45)
- Holcus lanatus L. [also reported as: Nothoholcus lanatus (L.) Nash]
- Youquepin 1937 (122, 124) TX
- Nelumbo lutea Willd.
- Youthwort 1876-1929 (92, 157, 158)
- Heracleum maximum Bartr. [also reported as: Heracleum lanatum Michx.]
- Youthwort [Youth wort] 1892-1923 (5, 6, 52, 92, 156, 158)
- Drosera rotundifolia L.
- Yucca
- 1923-Present (50, 1, 138, 148, 155)
- Yucca L. [also reported as: Yucca (Rupp.) L.]
- 1923 (156)
- Yucca filamentosa L.
- 1918-1977 (3, 121, 124, 125, 127)
- Yucca glauca Nutt.
- Yungfernblüthe (German) 1900 (158)
- Drosera rotundifolia L.
- Yuva (Sanskrit) 1886 (110)
- Hordeum vulgare L. [reported as: Hordeum hexastichon L.]
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