Displaying 26 - 50 out of 478 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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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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