Displaying 101 - 175 out of 478 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Carex jamesii Schwein. | C. S. Williamson s.n. | Jun | United States of America | Pennsylvania | — |
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| Carex leptalea Wahlenb. | C. S. Williamson 1062 | 23 Jul 1910 | Canada | Quebec | [W Habren]. | — |
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| Carex leptalea Wahlenb. | C. S. Williamson 641 | 08 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor. | — |
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| Carex leptalea Wahlenb. | C. S. Williamson s.n. | 18 Jul 1911 | Canada | Newfoundland and Labrador | [Placenha]. | — |
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| Carex mackenziei V.I.Krecz. | C. S. Williamson s.n. | 16 Jul 1910 | Canada | Quebec | [Pehl] Portage River. Bic Que. | — |
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| Carex marina Dewey | C. S. Williamson 551 | 06 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor. | — |
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| Carex mesochorea Mack. | C. S. Williamson 521 | 01 Aug 1911 | — | — | Carboneau | — |
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| Carex miliaris Michx. | C. S. Williamson 577 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbour. Caribou Island | — |
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| Carex miliaris Michx. | C. S. Williamson 463 | 22 Jul 1911 | — | — | Poule Verte; Placentia | — |
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| Carex oligosperma Michx. | C. S. Williamson 507 | 31 Jul 1911 | — | — | Harbor Grace. | — |
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| Carex pauciflora Lightf. | C. S. Williamson 1074 | 21 Jul 1910 | Canada | Quebec | [Farker] Point. | — |
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| Carex paupercula Michx. | C. S. Williamson s.n. | 21 Jul 1910 | Canada | Quebec | [Farker] Point. | — |
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| Carex platyphylla J.Carey | C. S. Williamson s.n. | May | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Carex retrorsa Schwein. | C. S. Williamson 1084 | 16 Jul 1910 | United States of America | Ohio | [Pehike] Portage River. [Inferred locality… | — |
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| Carex rostrata Stokes | C. S. Williamson 1078 | 16 Jul 1910 | Canada | — | Peppe Portage River; Bic Que | — |
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| Carex saltuensis L.H.Bailey | C. S. Williamson 1081 | 27 Jul 1910 | — | — | Bic | — |
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| Carex scirpoidea Michx. | C. S. Williamson 600 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbour. Caribou Island | — |
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| Carex spicata Huds. | C. S. Williamson s.n. | 18 Jun 1905 | United States of America | Pennsylvania | Montgomery Co. White Marsh [=Whitemarsh]. | — |
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| Carex sprengelii Dewey ex Spreng. | C. S. Williamson s.n. | 17 May 1908 | United States of America | Pennsylvania | Montgomery Co. Green Lake. | — |
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| Carex striata Michx. | C. S. Williamson s.n. | 04 Jul | United States of America | New Jersey | Absecon | — |
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| Carex trisperma Dewey | C. S. Williamson 691 | 10 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbour. | — |
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| Carex willdenowii Schkuhr | C. S. Williamson s.n. | 06 Jul 1909 | United States of America | Pennsylvania | Armstrong Co. Near Manorville. [Inferred… | — |
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| Solidago erecta Pursh | C. S. Williamson s.n. | 20 Sep 1908 | United States of America | New Jersey | Cape May Co. Ocean City… | — |
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| Solidago hispida Muhl. ex Willd. | C. S. Williamson 1390 | 01 Aug 1910 | Canada | Quebec | — |
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| Solidago hispida Muhl. ex Willd. | C. S. Williamson 1389 | 31 Jul 1910 | Canada | Quebec | Banks of Bic River | — |
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| Solidago macrophylla Pursh | C. S. Williamson 712 | 12 Aug 1912 | Canada | Newfoundland and Labrador | Battle Harbor | — |
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| Solidago macrophylla Pursh | C. S. Williamson 1393 | 28 Jul 1910 | Canada | Quebec | Peter Portage River | — |
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| Solidago ptarmicoides (Nees) B.Boivin | C. S. Williamson 2322 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Isle Royale. Rock crevices, mainland. | — |
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| Solidago uliginosa Nutt. | C. S. Williamson 1394 | 02 Aug 1910 | Canada | Quebec | St. [Jabrien]. | — |
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| Solidago uliginosa Nutt. | C. S. Williamson 762 | 16 Aug 1911 | Canada | New Brunswick | Between Deep Cove and Bradford's… | — |
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| Juncus alpinus subsp. nodulosus (Wahlenb.) Lindm. | C. S. Williamson 1107 | Aug. 1 | Canada | Quebec | Ditches, Bic. | — |
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| Juncus arcticus subsp. littoralis (Engelm.) Hultén | C. S. Williamson 629 | 08 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbour. | — |
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| Juncus bufonius L. | C. S. Williamson 1109 | 13 Jul 1910 | Canada | — | Bic Que | — |
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| Juncus bulbosus L. | C. S. Williamson 604 | 31 Jul 1910 | Canada | Newfoundland and Labrador | Harbor Grace | — |
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| Juncus caesariensis Coville | C. S. Williamson s.n. | 20 Aug 1907 | United States of America | New Jersey | Burnt Bridge near Chatsworth | — |
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| Juncus compressus Jacq. | C. S. Williamson 1112 | 05 Jul 1910 | Canada | Quebec | Heights of Abraham. | — |
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| Juncus dudleyi Wiegand | C. S. Williamson s.n. | 26 Jun 1910 | United States of America | Pennsylvania | Whitelands | — |
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| Juncus filiformis L. | C. S. Williamson 349 | 19 Jul 1911 | Canada | Newfoundland and Labrador | Placentia | — |
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| Juncus gerardii Loisel. | C. S. Williamson s.n. | 15 Jun 1880 | United States of America | New Jersey | Absecon | — |
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| Juncus subcaudatus (Engelm.) Coville & S.F.Blake | C. S. Williamson s.n. | Sep 1898 | United States of America | Pennsylvania | Willow Grove | — |
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| Juncus triglumis var. albescens Lange | C. S. Williamson 643 | 08 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbour. | — |
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| Salix balsamifera (Hook.) Barratt ex Andersson | C. S. Williamson 226 | 15 Jul 1911 | Canada | Newfoundland and Labrador | St. John's. | — |
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| Salix exigua subsp. interior (Rowlee) Cronquist | C. S. Williamson s.n. | — | United States of America | New Jersey | Warren Co. River bank below… | — |
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| Salix glauca L. | C. S. Williamson 555 | 06 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor. | — |
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| Salix phylicifolia subsp. planifolia (Pursh) Hiitonen | C. S. Williamson 685 | 9 Aug 1911 | Canada | Newfoundland and Labrador | Canbow Island, Battle Harbor. | — |
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| Salix phylicifolia subsp. planifolia (Pursh) Hiitonen | C. S. Williamson 684 | 09 Aug 1911 | Canada | Newfoundland and Labrador | Caribou Island. Battle Harbor. | — |
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| Salix uva-ursi Pursh | C. S. Williamson 624 | 08 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbour. | — |
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| Linnaea borealis var. longiflora Torr. | C. S. Williamson 1366 | 13 Jul 1910 | — | — | Bric Que | — |
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| Linnaea borealis var. longiflora Torr. | C. S. Williamson 283 | 16 Jul 1911 | Canada | Newfoundland and Labrador | Whitbourne. | — |
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| Lonicera caerulea L. | C. S. Williamson 385 | 22 Jul 1911 | — | — | — |
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| Xyris elliottii Chapm. | C. S. Williamson | Jul | United States of America | Florida | Lake Co. | — |
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| Ulmus rubra Muhl. | C. S. Williamson s.n. | 02 May 1905 - 30 May 1906 | United States of America | Pennsylvania | Ivy Rock | — |
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| Betula glandulosa Michx. | C. S. Williamson 619 | Aug. 8 | Canada | — | Battle Hardiplank | — |
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| Carpinus caroliniana Walter | C. S. Williamson s.n. | 10 May 1908 - 02 Aug 1908 | United States of America | Pennsylvania | Banks of creek | — |
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| Cornus canadensis L. x C. suecica L. | C. S. Williamson 278 | 16 Jul 1911 | Canada | Newfoundland and Labrador | Whitbourne. | — |
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| Cornus canadensis L. x C. suecica L. | C. S. Williamson 1292 | 16 Jul 1910 | — | — | Bre Que | — |
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| Cornus suecica L. | C. S. Williamson 1291 | 26 Jul 1910 | Canada | Quebec | Rivier Du Loup, Rocky shore | — |
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| Magnolia tripetala (L.) L. | C. S. Williamson s.n. | 20 May 1897 | United States of America | Pennsylvania | York Furnace | — |
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| Xyris platylepis Chapm. | C. S. Williamson s.n. | 03 Sep 1900 | United States of America | North Carolina | Wilmington | — |
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| Persea palustris (Raf.) Sarg. | C. S. Williamson s.n. | Apr 1897 | United States of America | Georgia | Ware Co. | — |
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| Morus rubra L. | C. S. Williamson s.n. | Apr. | — | — | Phila | — |
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| Ilex glabra (L.) A.Gray | C. S. Williamson s.n. | June | United States of America | New Jersey | Cedar Brook | — |
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| Ledum palustre subsp. groenlandicum (Oeder) Hultén | C. S. Williamson 573 | 7 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbour, Labrador. Carbon Island. | — |
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| Pieris phillyreifolia (Hook.) DC. | C. S. Williamson s.n. | s.d. | United States of America | Georgia | Ware Co. Waycross Ga. Apr.… | — |
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| Vaccinium uliginosum var. uliginosum | C. S. Williamson 593 | 7 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor, Labrador. | — |
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| Vaccinium uliginosum var. uliginosum | C. S. Williamson 786 | 18 Aug 1911 | Canada | Newfoundland and Labrador | St. John's. | — |
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| Vaccinium uliginosum var. uliginosum | C. S. Williamson 2296 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Keweenaw Co. Rocky islet southeast… | — |
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| Vaccinium vitis-idaea L. | C. S. Williamson 204 | 14 Jul 1911 | Canada | Newfoundland and Labrador | St. John's. | — |
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| Tilia americana L. | C. S. Williamson s.n. | Aug 1 | United States of America | Pennsylvania | Ivy Park | — |
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| Amorpha fruticosa L. | C. S. Williamson s.n. | Jun | United States of America | Pennsylvania | Gray's Ferry | — |
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| Apios americana Medik. | C. S. Williamson s.n. | 12 Aug 1910 | — | — | Cape May Court House | — |
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| Baptisia cinerea (Raf.) Fernald & B.G.Schub. | C. S. Williamson s.n. | May | United States of America | North Carolina | Richmond Co. | — |
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| Baptisia cinerea (Raf.) Fernald & B.G.Schub. | C. S. Williamson s.n. | — | United States of America | North Carolina | Wilmington. | — |
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| Baptisia perfoliata (L.) R.Br. | C. S. Williamson s.n. | Apr | United States of America | Georgia | Ware Co. | — |
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| Cabomba caroliniana A.Gray var. caroliniana | C. S. Williamson s.n. | 31 Aug 1908 | United States of America | Delaware | Milford. Near Station. | — |
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