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