Displaying 1 - 25 out of 478 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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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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| Juncus gerardii Loisel. | C. S. Williamson s.n. | 15 Jun 1880 | United States of America | New Jersey | Absecon | — |
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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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| Schoenoplectus americanus (Pers.) Volkart ex Schinz & R.Keller | C. S. Williamson s.n. | 22 Jul 1895 | United States of America | New York | Forked River | — |
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| Hypolepis barringtonii Schwartsb. | C. S. Williamson s.n. | Aug 1895 | United States of America | — | Oakland Isla | — |
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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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| Persea palustris (Raf.) Sarg. | C. S. Williamson s.n. | Apr 1897 | United States of America | Georgia | Ware Co. | — |
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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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| Aronia arbutifolia (L.) Pers. | C. S. Williamson s.n. | 21 May 1897 | United States of America | New York | Westchester Co. Bryn Mawr | — |
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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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| Vicia cracca L. | C. S. Williamson s.n. | Jul 1897 | United States of America | Pennsylvania | Delaware 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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| Sisymbrium altissimum L. | C. S. Williamson s.n. | 19 Jun 1898 | United States of America | Pennsylvania | Philadelphia Co. Grand Point | — |
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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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| Carex tonsa (Fernald) E.P.Bicknell | C. S. Williamson s.n. | 30 May 1899 | United States of America | New Jersey | Ocean Co. | — |
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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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| Quercus ilicifolia Wangenh. | C. S. Williamson s.n. | 04 Aug 1899 - May 1899 | United States of America | New York | Spring Lake and Clemmton NJ | — |
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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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| Panicum amarum var. amarum | C. S. Williamson s.n. | 29 Aug 1900 | United States of America | Virginia | Virginia Beach | — |
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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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| Panicum dichotomiflorum Michx. | C. S. Williamson s.n. | Sep 1900 | United States of America | Pennsylvania | Philadelphia Co. | — |
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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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| Panicum L. | C. S. Williamson s.n. | 02 Sep 1900 | United States of America | North Carolina | Welmington | — |
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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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