Displaying 51 - 75 out of 478 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Betula glandulosa Michx. | C. S. Williamson 619 | Aug. 8 | Canada | — | Battle Hardiplank | — |
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| Bistorta vivipara (L.) Delarbre | C. S. Williamson 636 | 8 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor. | — |
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| Botrychium lanceolatum (S.G.Gmel.) Ångstr. | C. S. Williamson 1001 | 29 Jul 1910 | Canada | Quebec | Cap Caribou Bic. | — |
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| Brassica rapa L. | C. S. Williamson s.n. | July | United States of America | Pennsylvania | Philadelphia Co. | — |
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| Bromus ciliatus L. | C. S. Williamson 1442 | 21 Jul 1910 | Canada | Quebec | Bic | — |
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| Bromus hordeaceus L. | C. S. Williamson s.n. | 05 Jun 1907 | United States of America | Pennsylvania | Northampton Co. Chestnut Hill | — |
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| Cabomba caroliniana A.Gray var. caroliniana | C. S. Williamson s.n. | 31 Aug 1908 | United States of America | Delaware | Milford. Near Station. | — |
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| Cakile edentula (Bigelow) Hook. var. edentula | C. S. Williamson s.n. | Aug | United States of America | New Jersey | Atlantic Co. | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 703 | 10 Aug 1911 | — | — | Battle Harbor Lat. | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 536 | 02 Aug 1911 | — | — | Harbor Grace. [Njer?]. | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 1034 | Aug 1912 | — | — | Mont[mvrency Falls]. | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 2303 | August 15-16, 1912 | United States of America | Michigan | Isle Royale. Johnson's Island. | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | C. S. Williamson 822 | 04 Sep 1911 | United States of America | New Jersey | Atsion. | — |
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| Calamagrostis neglecta subsp. inexpansa (A.Gray) Tzvelev | C. S. Williamson 2289 | August 15-16, 1912 | United States of America | Michigan | Isle Royale. Johnson's Island. Rock… | — |
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| Calamagrostis pickeringii A.Gray | C. S. Williamson 791 | 18 Aug 1911 | Canada | Newfoundland and Labrador | St. John's | — |
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| Calopogon tuberosus (L.) Britton, Sterns & Poggenb. var. tuberosus | C. S. Williamson 833 | 19 Jul 1911 | Canada | Newfoundland and Labrador | Placentia | — |
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| Carex aenea Fernald | C. S. Williamson 2323 | 15 Aug 1912 - 16 Aug 1912 | United States of America | Michigan | Isle Royale, Johnson Island near… | — |
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| Carex aenea Fernald | C. S. Williamson 1061 | 16 Jul 1910 | Canada | Quebec | Pehle Portage River. | — |
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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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| Carex albicans var. emmonsii (Dewey ex Torr.) Rettig | C. S. Williamson s.n. | 14 May 1910 | United States of America | New Jersey | Gloucester Co. Glassboro. | — |
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| Carex albursina E.Sheld. | C. S. Williamson s.n. | 30 May 1907 | — | — | — |
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| Carex asa-grayi L.H.Bailey | C. S. Williamson s.n. | 24 May 1908 | — | — | Ridley Creek. | — |
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| Carex atratiformis Britton | C. S. Williamson 1075 | Jul 1910 | Canada | Quebec | Cap Cabon Bic. | — |
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| Carex atratiformis Britton | C. S. Williamson 611 | 07 Aug 1911 | Canada | Newfoundland and Labrador | Battle Harbor Lab. | — |
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| Carex aurea Nutt. | C. S. Williamson 1056 | Jul 2013 | Canada | Quebec | Bic. | — |
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