Displaying 1 - 25 out of 4445 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Abies lasiocarpa (Hook.) Nutt. | F. Tweedy 2673 | Jul 1899 | United States of America | Wyoming | Sheridan Co. Big Horn Mountains,… | — |
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| Abronia ammophila Greene | F. Tweedy 442 | Sep 1885 | United States of America | Wyoming | Yellowstone Lake | — |
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| Abronia arenaria Menzies ex Hook. | F. Tweedy 442 | Aug 1885 | United States of America | Wyoming | Yellowstone Park; mouth of Pelican… | holotype |
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| Abronia elliptica A.Nelson | F. Tweedy 4615 | 25 May 1901 - 10 Jun 1901 | United States of America | Wyoming | Carbon Co. | — |
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| Abronia fragrans Nutt. ex Hook. | F. Tweedy 4976 | Jul 1902 | United States of America | Colorado | Boulder Co. Near Boulder | — |
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| Abutilon parvulum A.Gray | F. Tweedy s.n. | 1879 | United States of America | Texas | Tom Green Co. | — |
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| Acacia angustissima var. texensis (Torr. & A.Gray) Isely | F. Tweedy s.n. | 1880 | United States of America | Texas | Northern Texas | — |
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| Acacia greggii A.Gray | F. Tweedy s.n. | 1879 | United States of America | Texas | Tom Green Co. | — |
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| Acer glabrum Torr. | F. Tweedy 5551 | 20 Jun 1903 - 10 Jul 1903 | United States of America | Colorado | Gilpin Co. Eldora to Baltimore | — |
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| Acer glabrum Torr. | F. Tweedy 3541 | 15 Jun 1900 - 15 Jul 1900 | United States of America | Wyoming | Rolling plains between Sheridan and… | — |
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| Acer glabrum Torr. | F. Tweedy 3540 | 15 Jun 1900 - 15 Jul 1900 | United States of America | Wyoming | — |
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| Acer glabrum Torr. | F. Tweedy 342 | Aug 1897 | United States of America | Wyoming | Teton Co. Black Rock Creek | — |
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| Acer glabrum var. neomexicanum (Greene) Kearney & Peebles | F. Tweedy 4963 | Aug 1902 | United States of America | Colorado | Boulder Co. Mountains between Sunshine… | — |
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| Acer negundo var. interior (Britton) Sarg. | F. Tweedy s.n. | Jul 1889 | United States of America | Montana | Stillwater Co. | — |
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| Acer negundo var. interior (Britton) Sarg. | F. Tweedy 4964 | Jul 1902 | United States of America | Colorado | Boulder Co. Plains and foothills… | — |
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| Achillea lanulosa var. alpicola Rydb. | F. Tweedy 516 | Aug 1897 | United States of America | Wyoming | Teton Forest Reserve: To-Gwa-Tee Pass | holotype |
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| Achillea millefolium L. | F. Tweedy 4937 | August 1902 | United States of America | Colorado | Boulder Co. Mountains between Sunshine… | — |
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| Achillea millefolium L. | F. Tweedy 3135 | Sep 1900 | United States of America | Wyoming | Johnson Co. | — |
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| Achillea millefolium L. | F. Tweedy 4022 | 25 Jul 1901 | United States of America | Wyoming | Carbon Co. Continental Divide | — |
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| Achillea millefolium L. | F. Tweedy 515 | Aug 1897 | United States of America | Montana | Spread Creek | — |
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| Achillea millefolium L. | F. Tweedy 2071 | Jul 1899 | United States of America | Wyoming | Sheridan Co. | — |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | F. Tweedy 3683 | June 15th - July 15th, 1900 | United States of America | Wyoming | Rolling plains between Sheridan and… | — |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | F. Tweedy 78 | Jul 1897 | United States of America | Wyoming | Teton Co. Spread Creek. N.… | — |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | F. Tweedy s.n. | Jul 1887 | United States of America | Montana | Gallatin Co. | — |
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| Achnatherum lemmonii (Vasey) Barkworth | F. Tweedy | Jul 1902 | United States of America | Colorado | Boulder Co. Plains and Foothills… | — |
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