Displaying 26 - 100 out of 478 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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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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| 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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| Erigeron acris var. asteroides (Andrz.) DC. | C. S. Williamson 1402 | 25 Jul 1910 | Canada | Quebec | Bic | — |
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| Erigeron hyssopifolius Michx. | C. S. Williamson 1401 | 18 Jul 1910 | Canada | Quebec | banks of Bic River; calcarious… | — |
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| Erigeron quercifolius Lam. | C. S. Williamson | — | United States of America | Georgia | Chatham Co. Savannah; Wilmington | — |
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| Carex aenea Fernald | C. S. Williamson 2323 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Isle Royale, Johnson Island near… | — |
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| Carex aenea Fernald | C. S. Williamson 1061 | 16 Jul 1910 | Canada | Quebec | Pehle Portage River. | — |
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| Carex alata Torr. | C. S. Williamson s.n. | 13 Jun 1896 | United States of America | New Jersey | Cape May. | — |
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| Carex albursina E.Sheld. | C. S. Williamson s.n. | 30 May 1907 | — | — | — |
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| Carex asa-grayi L.H.Bailey | C. S. Williamson s.n. | 24 May 1908 | — | — | Ridley Creek. | — |
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| Carex atratiformis Britton | C. S. Williamson 1075 | Jul 1910 | Canada | Quebec | Cap Cabon Bic. | — |
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| Carex atratiformis Britton | C. S. Williamson 611 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor Lab. | — |
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| Carex aurea Nutt. | C. S. Williamson 1056 | Jul 2013 | Canada | Quebec | Bic. | — |
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| Carex brevior (Dewey) Mack. ex Lunell | C. S. Williamson 2276 | 15 Aug 1912 | United States of America | Michigan | Rock Harbor, Isle Royale. | — |
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| Carex brunnescens (Pers.) Poir. | C. S. Williamson 614 | 07 Aug 1911 | Canada | — | Caribou Island, Battle Harbor. | — |
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| Carex brunnescens (Pers.) Poir. | C. S. Williamson 1080 | 18 Jul 1910 | Canada | Quebec | Cape Enragé. | — |
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| Carex buxbaumii Wahlenb. | C. S. Williamson 433 | 01 Aug 1911 | Canada | Newfoundland and Labrador | Harbor Grace. | — |
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| Carex buxbaumii Wahlenb. | C. S. Williamson 2269 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Isle Royale. Wet place mainland… | — |
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| Carex canescens subsp. disjuncta (Fernald) Toivonen | C. S. Williamson 1056 | 18 Jul 1910 | Canada | Quebec | Bic. | — |
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| Carex canescens subsp. disjuncta (Fernald) Toivonen | C. S. Williamson s.n. | 14 May 1910 | United States of America | New Jersey | Glassboro. | — |
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| Unspecified | C. S. Williamson 1059 | 21 Jul 1910 | Canada | Quebec | Father Point. | — |
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| Carex capillaris L. | C. S. Williamson 550 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor. | — |
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| Carex caroliniana Schwein. | C. S. Williamson s.n. | 03 Jun 1905 | United States of America | Pennsylvania | Philadelphia Co. Cedar Grove. [Inferred… | — |
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| Carex crawfordii Fernald | C. S. Williamson 1067 | 16 Jul 1910 | Canada | Quebec | Petit Portage River | — |
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| Carex exilis Dewey | C. S. Williamson 288 | 16 Jul 1911 | — | — | Whitbourne | — |
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| Carex flava L. | C. S. Williamson 400 | 22 Jul 1911 | — | — | Placenha Mts. | — |
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| Carex folliculata L. | C. S. Williamson 225 | 18 Jul 1911 | — | — | St. John's | — |
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| Carex gracillima Schwein. | C. S. Williamson 808 | 22 Jul 1911 | Canada | Newfoundland and Labrador | Point Verde, Placentia. | — |
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| Carex gracillima Schwein. | C. S. Williamson s.n. | 30 May 1908 | United States of America | Pennsylvania | Bangor (Greenwold). | — |
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| Carex hirtifolia Mack. | C. S. Williamson s.n. | 30 May 1907 | United States of America | Pennsylvania | Lancaster Co. Haines Station. | — |
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| Carex houghtonii Torr. | C. S. Williamson 1083 | 16 Jul 1910 | Canada | Quebec | Petite Portage River. Bic. | — |
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| Carex intumescens Rudge | C. S. Williamson s.n. | 14 May 1910 | United States of America | New Jersey | Glassboro | — |
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