Displaying 1 - 25 out of 2344 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Abietinella abietina (Hedw.) M.Fleisch. | T. C. Porter | 12 Jul 1892 | United States of America | Colorado | Glen Eyrie | — | ||||
| Abietinella abietina (Hedw.) M.Fleisch. | T. C. Porter | 01 Jul 1872 | United States of America | Colorado | Glen Eyrie, near Colorado Springs | — | ||||
| Acanthospermum australe (Loefl.) Kuntze | T. C. Porter s.n. | 01 Sep 1891 | United States of America | North Carolina | Weldon | — |
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| Acer saccharum Marshall | T. C. Porter s.n. | July '91 | United States of America | Pennsylvania | Northampton Co. | — |
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| Acer saccharum Marshall | T. C. Porter 2 & 1 | Apr. 26/89 | United States of America | Pennsylvania | Northampton Co. | — |
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| Acer saccharum Marshall | T. C. Porter s.n. | May 1/89 | United States of America | Pennsylvania | Northampton Co. | — |
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| Acer spicatum Lam. | T. C. Porter 5104 | 17 Jun 1868 | United States of America | Pennsylvania | Schuylkill Co. | — |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | T. C. Porter s.n. | May - June 1871 | United States of America | Utah | Near Ogden. Hayden. | — |
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| Achnatherum robustum (Vasey) Barkworth | T. C. Porter s.n. | Aug. 12/73 | United States of America | Colorado | El Paso Co. Colorado Springs. | — |
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| Aconitum columbianum Nutt. subsp. columbianum | T. C. Porter 3371 | 29 Jul 1873 | United States of America | Utah | Uinta Mountains, Utah Territory | — |
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| Aconitum columbianum Nutt. subsp. columbianum | T. C. Porter s.n. | 29 Jul 1873 | United States of America | Utah | Uinta Mountains, Utah Territory | paratype |
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| Aconitum columbianum Nutt. subsp. columbianum | T. C. Porter s.n. | 29 Jul 1873 | United States of America | Utah | Uinta Mountains, Utah Territory | — |
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| Actaea pachypoda Elliott | T. C. Porter s.n. | 01 Jul 1899 | United States of America | New Jersey | Warren Co. Marble Hill, above… | — |
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| Actinella grandiflora var. glabrata Porter | T. C. Porter s.n. | Aug 1874 | United States of America | Colorado | Sangre de Cristo Range, C.… | possible isotype |
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| Actinella grandiflora var. glabrata Porter | T. C. Porter s.n. | Aug 1874 | United States of America | Colorado | Sangre de Cristo Range, C.… | possible isotype |
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| Adenocaulon bicolor Hook. | T. C. Porter s.n. | Jul 1865 | United States of America | Michigan | Near Sault Ste. Marie. | — |
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| Adenocaulon bicolor Hook. | T. C. Porter s.n. | s.d. | — | — | Lake Superior | — |
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| Adiantum pedatum L. | T. C. Porter 42 | 1874 | United States of America | Pennsylvania | Easton | — |
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| Aesculus flava Sol. | T. C. Porter s.n. | 1871 | United States of America | Pennsylvania | — |
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| Aesculus parviflora Walter | T. C. Porter s.n. | Fl. July 12, Ft. Aug. 6, 1891 | United States of America | Pennsylvania | Northampton Co. College Campus | — |
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| Aesculus parviflora Walter | T. C. Porter s.n. | July 4/91 | — | — | College Campus | — |
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| Aesculus parviflora Walter | T. C. Porter s.n. | July-Aug/91 | — | — | College Campus | — |
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| Aesculus pavia L. | T. C. Porter 5124 | — | United States of America | South Carolina | — |
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| Aethusa cynapium L. | T. C. Porter s.n. | 16 Oct 1899 | United States of America | Pennsylvania | Delaware Co. | — |
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| Aethusa cynapium L. | T. C. Porter s.n. | 16 Oct 1899 | United States of America | Pennsylvania | Delaware Co. | — |
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