Displaying 1 - 50 out of 478 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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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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| Acer negundo L. | C. S. Williamson s.n. | May | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Acer nigrum F.Michx. | C. S. Williamson s.n. | 02 Sep 1906 | United States of America | Pennsylvania | Island at [Luitts] Eddy | — |
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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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| Agrimonia gryposepala Wallr. | C. S. Williamson s.n. | 06 Jun 1909 | United States of America | Pennsylvania | Revese | — |
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| Agrimonia parviflora Aiton | C. S. Williamson s.n. | Aug | United States of America | New York | Westville | — |
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| Agropyron Gaertn. | C. S. Williamson s.n. | Aug | — | — | Phil [Note: no country, state]. | — |
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| Agrostis | C. S. Williamson 586 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Newfoundland. Caribou Island. Battle Harbor… | — |
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| Agrostis mertensii Trin. | C. S. Williamson 714 | 11 Aug 1911 | Canada | Newfoundland and Labrador | Labrador. Battle Harbor. | — |
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| Agrostis perennans (Walter) Tuck. | C. S. Williamson 771 | 18 Aug 1911 | United States of America | New York | St. John's. | — |
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| Agrostis stolonifera L. | C. S. Williamson 770 | 18 Aug 1911 | — | — | St. John's. | — |
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| Aira praecox L. | C. S. Williamson s.n. | May 30th-June 7th 1908 | United States of America | New York | Cold Spring, 2 Point Pleasant. | — |
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| Alnus viridis subsp. crispa (Aiton) Turrill | C. S. Williamson 1156 | 16 Jul 1910 | Canada | Quebec | Rimouski-Neigette Reg. Co. Mun. Rimouski.… | — |
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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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| Amaranthus deflexus L. | C. S. Williamson s.n. | Aug | United States of America | New Jersey | Ballast Karghns Pt. | — |
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| Amaranthus graecizans L. | C. S. Williamson s.n. | Aug | United States of America | New Jersey | Ballast Karghns Pt. | — |
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| Amaranthus pumilus Raf. | C. S. Williamson s.n. | — | United States of America | North Carolina | Seacoast near Wilmington. | — |
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| Amaranthus pumilus Raf. | C. S. Williamson s.n. | 01 Sep | United States of America | North Carolina | Sea Beach near Wrightsville | — |
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| Amelanchier arborea (F.Michx.) Fernald | C. S. Williamson s.n. | Apr. | United States of America | Pennsylvania | Philadelphia Co. | — |
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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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| Andromeda glaucophylla Link | C. S. Williamson 595 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Labrador. Caribou Island, Battle Harbor.… | — |
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| Andromeda glaucophylla Link | C. S. Williamson 788 | 18 Aug 1911 | Canada | Newfoundland and Labrador | Newfoundland. St. John's. Bogs. | — |
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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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| Anemone americana (DC.) H.Hara | C. S. Williamson | May | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Antennaria howellii subsp. neodioica (Greene) R.J.Bayer | C. S. Williamson 1409 | July 15, 1910 | — | — | — |
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| Antennaria howellii subsp. petaloidea (Fernald) R.J.Bayer | C. S. Williamson 430 | July 24th 1911 | Canada | Newfoundland and Labrador | Newfoundland. Placenka. | — |
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| Apios americana Medik. | C. S. Williamson s.n. | 12 Aug 1910 | — | — | Cape May Court House | — |
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| Aplectrum hyemale (Muhl. ex Willd.) Nutt. | C. S. Williamson s.n. | 1 May 1910 | United States of America | Pennsylvania | Delaware Co. Wawa | — |
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| Arabidopsis thaliana (L.) Heynh. | C. S. Williamson s.n. | [collector lived 1857-1914] | United States of America | Pennsylvania | Philadelphia Co. | — | ||||
| Aralia hispida Vent. | C. S. Williamson 443 | 26 Jul 1911 | — | — | — |
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| Arctostaphylos alpina (L.) Spreng. | C. S. Williamson 572 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Labrador. Battle Harbor, Lab. | — |
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| Arethusa bulbosa L. | C. S. Williamson 239 | 16 Jul 1911 | Canada | Newfoundland and Labrador | Whitbourne | — |
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| Aristida tuberculosa Nutt. | C. S. Williamson s.n. | 03 Sep 1909 | United States of America | New Jersey | Ocean Co. 3/4 E of… | — |
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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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| 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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| Aronia melanocarpa (Michx.) Elliott | C. S. Williamson s.n. | May | United States of America | Pennsylvania | Montgomery Co. | — |
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| Aronia x prunifolia (Marshall) Rehder | C. S. Williamson s.n. | — | United States of America | New Jersey | Gloucester Co. | — |
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| Artemisia absinthium L. | C. S. Williamson 466 | 28 Jul 1911 | — | — | — |
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| Artemisia vulgaris L. | C. S. Williamson 1413 | 28 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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| Asplenium viride Huds. | C. S. Williamson 991 | 27 Jul 1910 | Canada | Quebec | Bic. | — |
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| Athyrium filix-femina subsp. cyclosorum (Rupr.) C.Chr. | C. S. Williamson 657 | 08 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor | — |
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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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| Barbarea vulgaris W.T.Aiton | C. S. Williamson s.n. | May | United States of America | Pennsylvania | Philadelphia 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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