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- Ubatim (Brazil) 1550 (107) Hans Stade
- Zea mays L.
- Ulavou (Sanskrit) 1886 (110)
- Lagenaria siceraria (Molina) Standl. [reported as: Lagenaria vulgaris Ser. ]
- Uma (Dakota) 1919 (37) Uma-hu (Hazel-bush)
- Corylus americana Walt.
- Umbel root [Umbil root, Umbil-root] 1900-1908 (64, 158)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill ]
- Umbellated pyrola 1913 (5)
- Pyrola americana Sweet
- Umbel-like sedge 1913 (5)
- Carex umbellata Schkuhr ex Willd.
- Umbel-spike sedge [Umbel-spiked sedge] 1903 (66)
- Carex umbellata Schkuhr ex Willd.
- Umbil 1876 (92)
- Cypripedium L.
- Umbrella flatsedge Present (50)
- Cyperus diandrus Torr.
- Umbrella plant [Umbrella-plant]
- 1928 (40)
- Agastache foeniculum (Pursh) Kuntze [reported as: Agastache anethiodora (Nutt.) Britton ]
- 1932-1936 (1, 93) Neb
- Eriogonum Michx.
- 1926-1932 (85, 98) Neb SD
- Eriogonum annuum Nutt.
- 1913 (80) IA
- Mirabilis nyctaginea (Michx.) MacM. [reported as: Oxybaphus nyctagineus (Michx.) Sweet ]
- 1900-1929 (64, 157, 158)
- Podophyllum peltatum L.
- Umbrella-grass [Umbrella grass] 1932-1936 (1, 93) Neb
- Fuirena Rottb.
- Umbrella-sedge [Umbrella sedge] Present (50)
- Fuirena Rottb.
- Umbrella-wort [Umbrella wort]
- 1900-1936 (1, 93, 158)
- Allionia L. [also reported as: Allionia Loefl. ]
- 1932 (85) SD
- Mirabilis linearis (Pursh) Heimerl [reported as: Alliona linearis Pursh ]
- 1923 (156)
- Mirabilis nyctaginea (Michx.) MacM. [reported as: Oxybaphus nyctagineus (Michx.) Sweet ]
- Unarmed brome grass 1912 (152) NM
- Bromus inermis Leyss.
- Unaste'tstiyû (Cherokee, very small root) 1886 (102)
- Aristolochia serpentaria L.
- Unbearded wheat 1900 (158)
- Triticum aestivum L. [reported as: Triticum hybernum L. ]
- Unchela (Dakota) 1919 (37) fruit was called Unchela taspun
- Opuntia humifusa (Raf.) Raf.
- Underwood's moonwort 1913 (5)
- Botrychium lunaria (L.) Sw. [reported as: Botrychium onandagense Underw. ]
- Underwood's spike-moss [Underwood's spikemoss] 1986-Present (4, 50)
- Selaginella underwoodii Hieron.
- Unicorn plant [Unicorn-plant]
- 1932-Present (1, 4, 50, 109)
- Proboscidea Schmidel [also reported as: Proboscidea Keller (Possibly, Proboscidea Schmidel), Proboscidea (Schmid.) Moench ]
- 1820-1986 (4, 5, 19, 38, 63, 72, 85, 92, 93, 97, 107, 122, 156, 158)
- Proboscidea louisianica (P. Mill.) Thellung [also reported as: Martynia louisiana Miller, Martynia proboscidea Pursh, Martynia proboscides Gloxin, Proboscidea jussieui Keller ]
- Uniseme deltine (French) 1828 (7)
- Pontederia cordata L. [reported as: Unisema deltifolia Raf. ]
- Ûnle Uki'lti (Cherokee, the locust frequents it) 1886 (102)
- Porteranthus stipulatus (Muhl. ex Willd.) Britt. [reported as: Gillenia stipulacea Nutt. ]
- Unlucky tree 1894-1913 (5, 75) Adirondacks, unlucky for women to stand under this tree
- Pinus banksiana Lamb.
- Ûnnagéi (Cherokee, black) 1886 (102) medicinal for disease of this name that was said to turn hands and eyesockets black
- Senna marilandica (L.) Link [reported as: Cassia marilandica L. ]
- Unshoe-the-horse 1900 (158)
- Botrychium lunaria (L.) Sw.
- Ûnû (Sanskrit) 1886 (110)
- Panicum miliaceum L.
- Unzhinga (Omaha-Ponca) 1919 (37) Unzhinga-hi (Hazel-bush)
- Corylus americana Walt.
- Ungkcela blaska (Lakota, flat cactus) 1918?-1970? (121)
- Opuntia P. Mill.
- Ungpang tawota (Lakota, elk food) 1918?-1970? (121)
- Possibly Ceanothus herbaceus Raf. [reported as: Ceanothus ovatus Desf. ]
- Upland aster 1933 (127) ND
- Oligoneuron album (Nutt.) Nesom
[reported as: Aster ptarmicoides (Nees) Torr. & Gray ]
- Upland bentgrass [Upland bent grass, Upland bent-grass] 1913-Present (5, 50, 93, 119)
- Agrostis perennans (Walt.) Tuckerman
- Upland blackberry Present (50)
- Rubus pergratus Blanch.
- Upland brittle bladder fern [Upland brittle bladderfern] Present (50)
- Cystopteris tenuis (Michx.) Desv.
- Upland creek stuff 1913 (5)
- Spartina pectinata Bosc ex Link
[reported as: Spartina michauxiana Hitchc. ]
- Upland cress 1923 (156)
- Lepidium sativum L.
- Upland heart's-ease [Upland hearstease] 1894 (114) Neb
- Polygonum lapathifolium L.
[reported as: Polygonum incarnatum Ell. ]
- Upland hickory 1913?-1923 (5, 156)
- Carya ovata (P. Mill.) K. Koch [also reported as: Hicoria ovata (P. Mill.) Britton ]
- Upland poplar 1892 (6)
- Populus tremuloides Michx.
- Upland speedwell
- 1913-1923 (5, 156)
- Veronica officinalis L.
- 1900 (158)
- Veronica serpyllifolia L.
- Upland sumac [Upland sumach]
- 1900-1937 (5, 97, 156, 157)
- Rhus copallinum L. [also reported as: Rhus copallina L. ]
- 1869-1929 (49, 53, 58, 92, 93, 156, 157, 158)
- Rhus glabra L.
- Upland white aster 1899-1923 (5, 72, 131, 156)
- Oligoneuron album (Nutt.) Nesom
[also reported as: Aster ptarmicoides (Nees) Torr. & Gray ]
- Upland white oak 1818-1826 (10, 33)
- Quercus stellata Wangenh. [also reported as: Quercus obtusiloba Michx. ]
- Upright avens 1840 (19)
- Geum aleppicum Jacq. [reported as: Geum strictum Aiton ]
- Upright axyris 1913 (5)
- Axyris amaranthoides L. [reported as: Axyris amarantoides L.]
- Upright bindweed [Upright bind-weed] 1907-1937 (5, 72, 97, 156)
- Calystegia spithamaea (L.) Pursh [also reported as: Convolvulus spithamaeus L. ]
- Upright blotched spurge 1900 (158)
- Chamaesyce nutans (Lag.) Small
[reported as: Euphorbia nutans Lag.]
- Upright burhead [Upright bur-head, Upright burrhead]
- Present (50)
- Echinodorus berteroi (Spreng.) Fassett
- 1899-1938 (5, 72, 93, 97, 120, 131)
- Echinodorus cordifolius (L.) Griseb.
- Upright buttercups 1892 (6)
- Ranunculus acris L.
- Upright carrion-flower [Upright carrionflower] Present (50)
- Smilax ecirrata (Engelm. ex Kunth) S. Wats.
- Upright chess
- 1938 (119) OK
- Bromus commutatus Schrad.
- 1893-1912 (5, 56, 66, 72)
- Bromus racemosus L.
- Upright cockspur 1783 (46) Manasseh Cutler
- Galium circaezans Michx.
- Upright crowfoot 1892 (6)
- Ranunculus acris L.
- Upright goosefoot 1907-1912 (62, 72) IA IN
- Chenopodium urbicum L.
- Upright knotweed 1894 (129) SD
- Polygonum erectum L.
- Upright peniroyal 1879 (46) Josselyn
- Hedeoma pulegioides (L.) Pers.
- Upright prairie coneflower [Upright prairieconeflower] 1942-Present (50, 155)
- Ratibida columnifera (Nutt.) Wood & Standl.
- Upright sedge 1894-Present (50, 129)
- Carex stricta Lam. [also reported as: Carex strictior Dewey ]
- Upright smilax 1907-1937 (5, 72, 97)
- Smilax ecirrata (Engelm. ex Kunth) S. Wats.
- Upright spotted spurge 1899-1937 (5, 62, 93, 97, 131, 156, 158)
- Chamaesyce nutans (Lag.) Small
[also reported as: Chamaesyce preslii (Guss.) Arthur,Euphorbia nutans Lag., Euphorbia preslii Guss. ]
- Upright wood sorrel 1913 (5)
- Oxalis stricta L. [reported as: Xanthoxalis stricta (L.) Small ]
- Upright yellow wood sorrel [Upright yellow wood-sorrel] 1899-1937 (72, 97, 131, 158)
- Oxalis stricta L. [also reported as: Xanthoxalis stricta (L.) Small ]
- Upright-leaf sedge [Upright-leaved sedge] 1878 (86)
- Carex stricta Lam.
- Urban spurge Present (50)
- Euphorbia agraria Bieb.
- Urn-tree hawthorn 1986 (4)
- Crataegus calpodendron (Ehrh.) Medik.
- Userdas (Catalan) 1886 (110)
- Medicago sativa L.
- Usfur (Arabic) 1886 (110)
- Carthamus tinctorius L.
- Ush-keobuag (Chippewa) 1852 (47)
- Helianthus tuberosus L.
- Uskuyecha-hu (Dakota) 1919 (37)
- Quercus macrocarpa Michx.
- Uta (Dakota) 1919 (37) Uta-hu (Oak tree)
- Quercus rubra L.
- Utasi (Sanskrit) 1886 (110)
- Linum usitatissimum L.
- Ûtsati uwadska (Cherokee, fish scales) 1886 (102) from shape of leaves
- Thalictrum thalictroides (L.) Eames & Boivin [reported as: Thalictrum anemonoides Michx. ]
- Uvedalia 1900-1922 (53, 158)
- Smallanthus uvedalius (L.) Mackenzie ex Small [also reported as: Polymnia uvedalia L. ]
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