Displaying 176 - 250 out of 478 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Ilex vomitoria Aiton | C. S. Williamson s.n. | — | United States of America | — | 1. Wilmington, N.C. 2. Savannah,… | — |
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| Potentilla tridentata Aiton | C. S. Williamson 2280 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Keweenaw Co. Isle Royale. Rock… | — |
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| Bistorta vivipara (L.) Delarbre | C. S. Williamson 636 | 8 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor. | — |
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| Perilla frutescens (L.) Britton | C. S. Williamson s.n. | Aug | United States of America | North Carolina | Old Fort | — |
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| Polygonum erectum L. | C. S. Williamson s.n. | July | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Fagopyrum esculentum Moench | C. S. Williamson s.n. | June | United States of America | New Jersey | Salem Co. | — |
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| Persicaria glabra (Willd.) M.Gómez | C. S. Williamson s.n. | 05 Sep 1909 | United States of America | New Jersey | Cape May Co. | — |
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| Persicaria glabra (Willd.) M.Gómez | C. S. Williamson s.n. | 05 Sep 1909 | United States of America | New Jersey | Cape May Co. | — |
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| Persicaria hydropiperoides (Michx.) Small | C. S. Williamson s.n. | Sep 1897 | United States of America | Pennsylvania | Essington | — |
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| Barbarea vulgaris W.T.Aiton | C. S. Williamson s.n. | May | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Brassica rapa L. | C. S. Williamson s.n. | July | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Persicaria lapathifolia (L.) Delarbre | C. S. Williamson s.n. | Aug | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Persicaria lapathifolia (L.) Delarbre | C. S. Williamson 892 | 16 Sep 1911 | United States of America | Pennsylvania | Philadelphia Co. Grenarch Point | — |
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| Cakile edentula (Bigelow) Hook. var. edentula | C. S. Williamson s.n. | Aug | United States of America | New Jersey | Atlantic Co. | — |
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| Descurainia sophia (L.) Webb ex Prantl | C. S. Williamson s.n. | June | United States of America | New Jersey | Ballast Karghns Pt. | — |
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| Cerastium velutinum Raf. | C. S. Williamson s.n. | Jun 1899 - 30 May 1911 | United States of America | Pennsylvania | 1) Pink Hill, 2) Wilhelium… | — |
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| Diplotaxis tenuifolia (L.) DC. | C. S. Williamson s.n. | Aug | United States of America | New Jersey | Camden Co. | — |
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| Raphanus raphanistrum L. | C. S. Williamson s.n. | July 4th | United States of America | New Jersey | Ocean Co. | — |
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| Sisymbrium altissimum L. | C. S. Williamson s.n. | 19 Jun 1898 | United States of America | Pennsylvania | Philadelphia Co. Grand Point | — |
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| Erysimum cheiranthoides L. | C. S. Williamson s.n. | 04 Jul 1907 | United States of America | New Jersey | Sussex Co. Muckshaw Pond, s.w.… | — |
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| Euphrasia oakesii Wettst. | C. S. Williamson 713 | 12 Aug 2020 | Canada | Newfoundland and Labrador | Battle Harbor, Labrador. | — |
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| Epilobium coloratum Biehler | C. S. Williamson s.n. | July | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Epilobium hornemannii Rchb. subsp. hornemannii | C. S. Williamson 698 | 7 Aug 1911 | Canada | Newfoundland and Labrador | Caribou Island, Battle Harbor Lab. | — |
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| Paronychia canadensis (L.) Alph.Wood | C. S. Williamson s.n. | June | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Silene acaulis (L.) Jacq. | C. S. Williamson 556 | 6 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor | — |
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| Pedicularis lanceolata Michx. | C. S. Williamson s.n. | Jul | United States of America | North Carolina | Jackson Co. Balsam | — |
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| Scoparia dulcis L. | C. S. Williamson s.n. | s.d. | United States of America | Florida | Seminole Co. Lake Brantley, Florida… | — |
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| Silene vulgaris (Moench) Garcke | C. S. Williamson s.n. | June | United States of America | New York | Ballast Kaighn's Point | — |
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| Spergularia rubra (L.) J.Presl & C.Presl | C. S. Williamson s.n. | Jun 1907 | United States of America | Pennsylvania | Philadelphia Co. 38th & Spruce | — |
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| Ludwigia linearis Walter var. linearis | C. S. Williamson s.n. | Aug | United States of America | New Jersey | Atlantic Co. | — |
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| Phlox maculata L. | C. S. Williamson s.n. | 21 Jun 1908 | United States of America | Pennsylvania | Philadelphia Co. Rock Hill | — |
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| Diphasiastrum complanatum (L.) Holub | C. S. Williamson 2265 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Isle Royale. Johnsons Island. | — |
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| Selaginella arenicola Underw. subsp. arenicola | C. S. Williamson s.n. | July | United States of America | Florida | Lake Co. Southern US | — |
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| Selaginella rupestris (L.) Spring | C. S. Williamson 2317 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Isle Royale. Mainland Rock Harbour. | — |
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| Selaginella selaginoides (L.) P.Beauv. ex Mart. & Schrank | C. S. Williamson 2290 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Isle Royal. Rockpocket Rock. Islet… | — |
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| Lantana montevidensis (Spreng.) Briq. | C. S. Williamson s.n. | s.d. | United States of America | Florida | Dry sand Lake Bran[...] | — |
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| Gentiana villosa L. | C. S. Williamson s.n. | 03 Sep 1911 | United States of America | Pennsylvania | Chester Co. Nottingham Barrens | — |
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| Eriocaulon compressum Lam. | C. S. Williamson s.n. | 16 Jun 1907 | United States of America | New Jersey | Bennet | — |
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| Cryptogramma acrostichoides R.Br. | C. S. Williamson 2321 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Isle Royale. Mamland Rock Harbor. | — |
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| Schizaea pusilla Pursh | C. S. Williamson s.n. | 20 Aug 1907 | United States of America | New Jersey | Burlington Co. | — |
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| Schizaea pusilla Pursh | C. S. Williamson s.n. | Aug 1908 | United States of America | New Jersey | Absecon | — |
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| Thelypteris interrupta (Willd.) K.Iwats. | C. S. Williamson s.n. | Aug | United States of America | Florida | Palm Springs | — |
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| Cystopteris bulbifera (L.) Bernh. | C. S. Williamson s.n. | July | United States of America | New Jersey | Warren Co. Phillipsburg | — |
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| Aplectrum hyemale (Muhl. ex Willd.) Nutt. | C. S. Williamson s.n. | 1 May 1910 | United States of America | Pennsylvania | Delaware Co. Wawa | — |
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| Calopogon tuberosus (L.) Britton, Sterns & Poggenb. var. tuberosus | C. S. Williamson 833 | 19 Jul 1911 | Canada | Newfoundland and Labrador | Placentia | — |
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| Cleistesiopsis divaricata (L.) Pansarin & F.Barros | C. S. Williamson s.n. | 20 Jun 1909 | United States of America | Delaware | Sussex Co. Ellendale | — |
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| Cleistesiopsis divaricata (L.) Pansarin & F.Barros | C. S. Williamson 74 | 20 Jun 1909 | United States of America | Delaware | Sussex Co. | — |
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| Corallorhiza odontorhiza (Willd.) Poir. var. odontorhiza | C. S. Williamson s.n. | s.d. | United States of America | North Carolina | Jackson Co. Balsam | — |
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| Cypripedium acaule Aiton | C. S. Williamson s.n. | May | United States of America | New Jersey | Westville | — |
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| Cypripedium montanum Douglas ex Lindl. | C. S. Williamson s.n. | 4 May 1911 | United States of America | Pennsylvania | Crum Creek | — |
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| Goodyera repens (L.) R.Br. | C. S. Williamson 1143 | s.d. | Unknown | — | — |
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| Isotria verticillata (Muhl. ex Willd.) Raf. | C. S. Williamson s.n. | May 1905 | United States of America | Pennsylvania | Lesle | — |
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| Platanthera flava (L.) Lindl. | C. S. Williamson s.n. | Jun 1897 | United States of America | Pennsylvania | Delaware Co. Lima | — |
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| Carex disperma Dewey | C. S. Williamson 1168 | 19 Jul 1910 | Canada | Quebec | Cap [Canton]. | — |
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| Platanthera psycodes (L.) Lindl. | C. S. Williamson s.n. | 1 Jul 1909 | United States of America | Pennsylvania | Northampton Co. Greenwold Bangor | — |
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| Platanthera peramoena A.Gray | C. S. Williamson s.n. | 21 Jul 1906 | United States of America | New Jersey | Assanpink Creek | — |
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| Tillandsia setacea Sw. | C. S. Williamson | s.d. | United States of America | Florida | Pinellas Co. St Petersburg | — |
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| Amaranthus deflexus L. | C. S. Williamson s.n. | Aug | United States of America | New Jersey | Ballast Karghns Pt. | — |
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| Amaranthus graecizans L. | C. S. Williamson s.n. | Aug | United States of America | New Jersey | Ballast Karghns Pt. | — |
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| Suaeda maritima (L.) Dumort. | C. S. Williamson | Aug | — | — | Ballast Karghns Pt. | — |
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| Dysphania ambrosioides (L.) Mosyakin & Clemants | C. S. Williamson s.n. | — | United States of America | Pennsylvania | Philadelphia | — |
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| Verbesina heterophylla (Chapm.) A.Gray | C. S. Williamson s.n. | Aug | United States of America | Florida | Duval Co. Jacksonville | — |
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| Cornus canadensis L. x C. suecica L. | C. S. Williamson 604 | 08 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor. | — |
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| Cornus canadensis L. x C. suecica L. | C. S. Williamson 585 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor. Canbow Island | — |
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| Linnaea borealis var. longiflora Torr. | C. S. Williamson 620 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor. | — |
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| Diapensia lapponica L. | C. S. Williamson 569 | 6 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor Lab. Dry rocky… | — |
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| Paspalum distichum L. | C. S. Williamson s.n. | 02 Sep 1900 | United States of America | North Carolina | Wilmington. wet rocks | — |
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| Paspalum scrobiculatum L. | C. S. Williamson s.n. | 02 Sep 1900 | United States of America | North Carolina | Wilmington. wet rocks | — |
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| Paspalum setaceum var. muhlenbergii (Nash) D.J.Banks | C. S. Williamson s.n. | 02 Aug 1900 | United States of America | North Carolina | Wilmington. wet rocks | — |
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| Prunus mahaleb L. | C. S. Williamson s.n. | May | United States of America | Pennsylvania | Bartrams Garden | — |
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| Acrostichum danaeifolium Langsd. & Fisch. | C. S. Williamson s.n. | s.d. | United States of America | Florida | St. Petersburg | — |
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| Hypolepis barringtonii Schwartsb. | C. S. Williamson s.n. | s.d. | United States of America | Florida | Oakland | — |
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| Dionaea muscipula J.Ellis | C. S. Williamson | s.d. | United States of America | North Carolina | New Hanover Co. Wilmington. | — |
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| Drosera rotundifolia L. | C. S. Williamson 579 | 7 Aug 1911 | United States of America | Michigan | Keweenaw Co. Caribou Island, Battle… | — |
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| Drosera intermedia Hayne | C. S. Williamson | 1 Jul 1907 | United States of America | New Jersey | Absecon | — |
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