Displaying 1 - 50 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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| Xyris platylepis Chapm. | C. S. Williamson s.n. | 03 Sep 1900 | United States of America | North Carolina | Wilmington | — |
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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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| Ranunculus hispidus Michx. var. hispidus | C. S. Williamson s.n. | May 1903 | United States of America | Pennsylvania | Castle Rocks | — |
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| Potentilla pumila Poir. | C. S. Williamson s.n. | May 1903 | United States of America | Pennsylvania | Castle Rocks | — |
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| Rubus | C. S. Williamson s.n. | May 1903 | United States of America | New Jersey | Cedar Brook | — |
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| Potentilla simplex Michx. | C. S. Williamson s.n. | 30 May 1903 | United States of America | Pennsylvania | Sumreytown | — |
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| Packera aurea (L.) Á.Löve & D.Löve | C. S. Williamson s.n. | 29 May 1904 | United States of America | New York | Crosswick's Creek | — |
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| Acer negundo L. | C. S. Williamson s.n. | Jun 1904 | United States of America | Pennsylvania | [Joy Park] | — |
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| Pontederia cordata L. | C. S. Williamson s.n. | Jul 1904 | United States of America | New York | Westville | — |
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| Isotria verticillata (Muhl. ex Willd.) Raf. | C. S. Williamson s.n. | May 1905 | United States of America | Pennsylvania | Lesle | — |
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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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| Waldsteinia fragarioides var. fragarioides | C. S. Williamson | 31 May 1905 - 13 May 1906 | United States of America | Pennsylvania | Montgomery Co. | — |
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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 typhina Michx. | C. S. Williamson s.n. | 17 Jun 1905 | United States of America | New Jersey | Salem Co. | — |
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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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| Schoenoplectus subterminalis (Torr.) Soják | C. S. Williamson s.n. | 17 Aug 1905 | United States of America | New York | East of Parkdale | — |
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| Gymnopogon ambiguus (Michx.) Britton, Sterns & Poggenb. | C. S. Williamson s.n. | 27 Aug 1905 | United States of America | New York | Lammonton | — |
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| Scleria verticillata Muhl. ex Willd. | C. S. Williamson s.n. | 24 Sep 1905 | United States of America | New Jersey | Cape May 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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| Rhododendron periclymenoides (Michx.) Shinners | C. S. Williamson s.n. | 13 May 1906 | United States of America | Pennsylvania | Montgomery Co. | — |
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| Eriophorum gracile W.D.J.Koch ex Roth | C. S. Williamson s.n. | 30 May 1906 | United States of America | Pennsylvania | Bucks Co. | — |
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| Dichanthelium acuminatum var. acuminatum | C. S. Williamson s.n. | 09 Jun 1906 | United States of America | Pennsylvania | Delaware Co. near Wawa | — |
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| Eleocharis flavescens (Poir.) Urb. | C. S. Williamson s.n. | 17 Jul 1906 | United States of America | New Jersey | Cape May Co. Pond at… | — |
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| Eleocharis rostellata (Torr.) Torr. | C. S. Williamson s.n. | 17 Jul 1906 | United States of America | New York | Putnam Co. | — |
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| Platanthera peramoena A.Gray | C. S. Williamson s.n. | 21 Jul 1906 | United States of America | New Jersey | Assanpink Creek | — |
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