Displaying 1 - 50 out of 478 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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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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| 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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| Bartonia paniculata (Michx.) Muhl. subsp. paniculata | C. S. Williamson s.n. | 29 Aug 1908 | United States of America | Delaware | Sussex Co. | — |
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| Eclipta prostrata (L.) L. | C. S. Williamson s.n. | — | United States of America | Florida | Jackson Co. | — |
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| Xyris elliottii Chapm. | C. S. Williamson | Jul | United States of America | Florida | Lake Co. | — |
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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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| Selaginella arenicola Underw. subsp. arenicola | C. S. Williamson s.n. | July | United States of America | Florida | Lake Co. Southern US | — |
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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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| Thelypteris interrupta (Willd.) K.Iwats. | C. S. Williamson s.n. | Aug | United States of America | Florida | Palm Springs | — |
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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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| Verbesina heterophylla (Chapm.) A.Gray | C. S. Williamson s.n. | Aug | United States of America | Florida | Duval Co. Jacksonville | — |
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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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| Nolina brittoniana Nash | C. S. Williamson | — | United States of America | Florida | Lake Co. | — |
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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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| 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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| Erigeron quercifolius Lam. | C. S. Williamson | — | United States of America | Georgia | Chatham Co. Savannah; 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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| 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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| Baptisia perfoliata (L.) R.Br. | C. S. Williamson s.n. | Apr | United States of America | Georgia | Ware Co. | — |
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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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| 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 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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| 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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| 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 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 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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| 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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| 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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| 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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| 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 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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| 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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| Drosera rotundifolia L. | C. S. Williamson 579 | 7 Aug 1911 | United States of America | Michigan | Keweenaw Co. Caribou Island, Battle… | — |
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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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| 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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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 822 | 04 Sep 1911 | United States of America | New Jersey | Atsion. | — |
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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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| Panicum capillare L. | C. S. Williamson s.n. | 19 Sep 1908 | United States of America | New Jersey | Riddleton. | — |
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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 canescens subsp. disjuncta (Fernald) Toivonen | C. S. Williamson s.n. | 14 May 1910 | United States of America | New Jersey | Glassboro. | — |
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| Carex collinsii Nutt. | C. S. Williamson s.n. | 02 Aug - 02 Jul 6'07 | United States of America | New Jersey | Atlantic Co. Absecon, NJ to… | — |
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| Carex albicans var. emmonsii (Dewey ex Torr.) Rettig | C. S. Williamson s.n. | 14 May 1910 | United States of America | New Jersey | Gloucester Co. Glassboro. | — |
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| Carex typhina Michx. | C. S. Williamson s.n. | 17 Jun 1905 | United States of America | New Jersey | Salem Co. | — |
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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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| Carex striata Michx. | C. S. Williamson s.n. | 04 Jul | United States of America | New Jersey | Absecon | — |
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