Displaying 1 - 75 out of 478 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Castilleja latebracteata Pennell | C. S. Williamson s.n. | 27 Apr 1903 | United States of America | — | High bridge of Pecos [?]. | isotype |
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| Lythrum salicaria L. | C. S. Williamson 1272 | 06 Aug 1910 | Canada | Quebec | Montmorency Falls | — |
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| Pinus banksiana Lamb. | C. S. Williamson 1015 | 24 Jul 1911 | Canada | Quebec | L'Islet du Massacre, Bic | — |
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| Penstemon smallii A.Heller | C. S. Williamson s.n. | August | United States of America | North Carolina | Balsam | — |
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| Amaranthus pumilus Raf. | C. S. Williamson s.n. | — | United States of America | North Carolina | Seacoast near Wilmington. | — |
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| Amaranthus pumilus Raf. | C. S. Williamson s.n. | 01 Sep | United States of America | North Carolina | Sea Beach near Wrightsville | — |
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| Sphagnum teres (Schimp.) Ångstr. | C. S. Williamson | 07 Aug 1911 | Canada | Newfoundland and Labrador | Caribou Island, Battle Harbour, Labrador | — | ||||
| Cytisus scoparius (L.) Link | C. S. Williamson s.n. | 15 May 1910 | United States of America | Pennsylvania | Crum Lynn Station | — |
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| Juniperus horizontalis Moench | C. S. Williamson 2287 | — | United States of America | Michigan | Keweenaw Co. Rock Harbor, Isle… | — |
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| Picea glauca (Moench) Voss var. glauca | C. S. Williamson 1019 | 15 Jul 1911 | Canada | Quebec | Bic | — |
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| Eriocaulon parkeri B.L.Rob. | C. S. Williamson s.n. | 28 Jul 1906 | United States of America | New Jersey | Camden Co. | — |
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| Eriocaulon parkeri B.L.Rob. | C. S. Williamson s.n. | 02 Oct 1905 | United States of America | New Jersey | Camden Co. | — |
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| Selaginella acanthonota Underw. | C. S. Williamson s.n. | Jul 1892 | United States of America | North Carolina | Wilmington | holotype |
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| Marshallia williamsonii Small | C. S. Williamson s.n. | 02 Sep 1900 | United States of America | North Carolina | Wilmington | holotype |
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| Thuja occidentalis L. | C. S. Williamson 1020 | 13 Jul 1911 | Canada | Quebec | Bic | — |
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| Zygophyllum fabago L. | C. S. Williamson s.n. | — | United States of America | Pennsylvania | Karghn [?Karghn's] | — |
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| Echinochloa crus-galli (L.) P.Beauv. | C. S. Williamson s.n. | s.d. | United States of America | Pennsylvania | Philadelphia Co. Philadelphia | — |
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| Eragrostis pectinacea (Michx.) Nees | C. S. Williamson s.n. | s.d. | United States of America | Pennsylvania | Philadelphia Co. Philadelphia | — |
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| Eragrostis refracta (Muhl.) Scribn. | C. S. Williamson s.n. | 30 Aug 1900 | United States of America | North Carolina | Weldon | — |
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| Arabidopsis thaliana (L.) Heynh. | C. S. Williamson s.n. | [collector lived 1857-1914] | United States of America | Pennsylvania | Philadelphia Co. | — | ||||
| Carya illinoinensis (Wangenh.) K.Koch | C. S. Williamson s.n. | 12 Jul 1908 | United States of America | New York | Cape May | — |
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| Carya ovata (Mill.) K.Koch | C. S. Williamson s.n. | May | — | — | Phil a | — |
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| Juglans cinerea L. | C. S. Williamson s.n. | 17 May 1908 | United States of America | Pennsylvania | Montgomery Co. Sumneytown | — |
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| Agropyron Gaertn. | C. S. Williamson s.n. | Aug | — | — | Phil [Note: no country, state]. | — |
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| Agrostis perennans (Walter) Tuck. | C. S. Williamson 771 | 18 Aug 1911 | United States of America | New York | St. John's. | — |
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| Agrostis stolonifera L. | C. S. Williamson 770 | 18 Aug 1911 | — | — | St. John's. | — |
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| Aira praecox L. | C. S. Williamson s.n. | May 30th-June 7th 1908 | United States of America | New York | Cold Spring, 2 Point Pleasant. | — |
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| Alopecurus geniculatus L. | C. S. Williamson 292 | 16 Jul 1911 | — | — | Whitbourne. | — |
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| Alopecurus pratensis L. | C. S. Williamson 704 | 11 Aug 1911 | — | — | Battle Harbor [Lake]. | — |
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| Andropogon glomeratus var. glomeratus | C. S. Williamson s.n. | Sep 1906 | United States of America | Pennsylvania | Lester, PA | — |
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| Andropogon gyrans Ashe var. gyrans | C. S. Williamson s.n. | 06 Nov 1910 | United States of America | Pennsylvania | Radnor | — |
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| Bromus ciliatus L. | C. S. Williamson 1442 | 21 Jul 1910 | Canada | Quebec | Bic | — |
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| Arundinaria | C. S. Williamson s.n. | s.d. | United States of America | North Carolina | Weldon | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 703 | 10 Aug 1911 | — | — | Battle Harbor Lat. | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 536 | 02 Aug 1911 | — | — | Harbor Grace. [Njer?]. | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 1034 | Aug 1912 | — | — | Mont[mvrency Falls]. | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 2303 | August 15-16, 1912 | United States of America | Michigan | Isle Royale. Johnson's Island. | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 822 | 04 Sep 1911 | United States of America | New Jersey | Atsion. | — |
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| Calamagrostis neglecta subsp. inexpansa (A.Gray) Tzvelev | C. S. Williamson 2289 | August 15-16, 1912 | United States of America | Michigan | Isle Royale. Johnson's Island. Rock… | — |
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| Calamagrostis pickeringii A.Gray | C. S. Williamson 791 | 18 Aug 1911 | Canada | Newfoundland and Labrador | St. John's | — |
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| Coleataenia anceps (Michx.) Soreng | C. S. Williamson s.n. | 29 Aug 1800 | United States of America | Virginia | Virginia Beach | — |
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| Glyceria canadensis (Michx.) Trin. | C. S. Williamson 734 | 16 Aug 1911 | — | — | St. John's. | — |
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| Glyceria canadensis (Michx.) Trin. | C. S. Williamson 1443 | 23 Jul 1910 | Canada | Quebec | St. Fabien. | — |
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| Glyceria obtusa (Muhl.) Trin. | C. S. Williamson 368 | 21 Jul 1911 | — | — | Placenha [Nfed]. | — |
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| Glyceria septentrionalis Hitchc. | C. S. Williamson 733 | 18 Aug 1911 | United States of America | New Jersey | St. John's. | — |
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| Glyceria striata (Lam.) Hitchc. | C. S. Williamson 245 | 16 Jul 1911 | — | — | Whitbourne [Mld] | — |
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| Panicum amarum var. amarum | C. S. Williamson s.n. | 29 Aug 1900 | United States of America | Virginia | Virginia Beach | — |
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| Panicum capillare L. | C. S. Williamson s.n. | 19 Sep 1908 | United States of America | New Jersey | Riddleton. | — |
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| Panicum L. | C. S. Williamson s.n. | 02 Sep 1906 | United States of America | North Carolina | Welmington | — |
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| Panicum L. | C. S. Williamson s.n. | 02 Sep 1900 | United States of America | North Carolina | Welmington | — |
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| Triadica sebifera (L.) Small | C. S. Williamson s.n. | Aug [no year] | United States of America | Georgia | Chatham Co. Savannah | — |
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| Phalaris arundinacea L. | C. S. Williamson 2264 | 15 Aug 1912 | United States of America | Michigan | Isle Royale; Park Harbor | — |
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| Phalaris arundinacea L. | C. S. Williamson 2269 | August 15-16, 1912 | United States of America | Michigan | Isle Royale; Lake shore Johnson's… | — |
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| Poa alpina L. | C. S. Williamson 1430 | 19 Jul 1910 | — | — | Cap Enragé Bic | — |
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| Poa alpina L. | C. S. Williamson 1021 | s.d. | Canada | — | Cap Enrage. | — |
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| Poa alpina L. | C. S. Williamson 650 | 08 Aug 1911 | — | — | Battle [Harbelal]; Rocky Plains | — |
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| Poa autumnalis Muhl. ex Elliott | C. S. Williamson s.n. | 03 Jun 1908 | United States of America | Pennsylvania | Philadelphia Co. Wissahickon ravine. Phila.… | — |
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| Poa eminens J.Presl | C. S. Williamson 621 | 07 Aug 1911 | Canada | Nova Scotia | Caribou Island | — |
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| Poa eminens J.Presl | C. S. Williamson 1043 | 16 Jul 1910 | Canada | Quebec | Bic | — |
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| Poa annua L. | C. S. Williamson s.n. | s.d. | United States of America | Pennsylvania | Philadelphia Co. Philadelphia | — |
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| Poa cuspidata Nutt. | C. S. Williamson 13 | s.d. | United States of America | Pennsylvania | Darly Creek | — |
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| Poa glauca Vahl | C. S. Williamson 1031 | 14 Jul 1910 | Canada | Quebec | Bic. Calcareous mts. | — |
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| Poa glauca Vahl | C. S. Williamson 1441 | 20 Jul 1910 | Canada | Quebec | Bic. | — |
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| Poa palustris L. | C. S. Williamson 1425 | 22 Jul 1910 | Canada | Quebec | Bic | — |
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| Poa pratensis L. | C. S. Williamson 203 | 14 Jul 1911 | United States of America | — | St. Johns. Signal Hill. | — |
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| Poa pratensis L. | C. S. Williamson 687 | 10 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbour | — |
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| Poa pratensis L. | C. S. Williamson 1427 | 16 Jul 1910 | — | — | BicQue | — |
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| Poa secunda J.Presl subsp. secunda | C. S. Williamson 1429 | 18 Jul 1910 | — | — | Cap Enragé Bic Que. | — |
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| Eurybia spectabilis (Aiton) G.L.Nesom | C. S. Williamson s.n. | s.d. | United States of America | Georgia | Atkinson Co. DeKalb or Fulton… | — |
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| Arnica acaulis (Walter) Britton, Sterns & Poggenb. | C. S. Williamson s.n. | [May] | United States of America | North Carolina | Weldon | — |
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| Arnica lanceolata Nutt. | C. S. Williamson 1417 | 31 Jul 1910 | Canada | Quebec | Bic; banks of Bic River. | — |
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| Antennaria howellii subsp. neodioica (Greene) R.J.Bayer | C. S. Williamson 1409 | July 15, 1910 | — | — | — |
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| Artemisia absinthium L. | C. S. Williamson 466 | 28 Jul 1911 | — | — | — |
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| Eclipta prostrata (L.) L. | C. S. Williamson s.n. | — | United States of America | Florida | Jackson Co. | — |
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| Erigeron acris var. asteroides (Andrz.) DC. | C. S. Williamson 1402 | 25 Jul 1910 | Canada | Quebec | Bic | — |
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