Displaying 1 - 25 out of 696 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Abutilon americanum Panz. | G. W. Letterman 5515 | Jul 1882 | United States of America | Texas | Bexar Co. | — | 3779398 |
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| Abutilon texense Torr. & A.Gray | G. W. Letterman s.n. | Aug 1882 | United States of America | Texas | Hays Co. | — | 3855445 |
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| Acacia angustissima var. hirta (Nutt.) B.L.Rob. | G. W. Letterman s.n. | Aug 1882 | United States of America | Texas | Callahan Co. | — | 2716075 |
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| Acer | G. W. Letterman s.n. | Aug 1883 | — | — | — | 02490510 |
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| Acer negundo L. | G. W. Letterman s.n. | 25 Jun 1884 | United States of America | Missouri | Saint Louis Co. | — | 2485227 |
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| Acer negundo L. | G. W. Letterman s.n. | 18 Jun 1896 | United States of America | Missouri | Saint Louis Co. | — | 02447982 |
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| Acer nigrum F.Michx. | G. W. Letterman s.n. | Fl. April 3, 1884; Fr. July 3, 1884 | United States of America | Missouri | Saint Louis Co. | — | 2487002 |
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| Acer nigrum F.Michx. | G. W. Letterman s.n. | Flowers April 10, 1884; Fruit June 28, 1884; Buds Jan. 19, 1894; Bark Jan. 19, 1894 | United States of America | Missouri | Saint Louis Co. | — | 2487030 |
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| Acer rubrum L. | G. W. Letterman s.n. | Jul 1883 | United States of America | Arkansas | Pulaski Co. | — | 2487962 |
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| Acer rubrum L. | G. W. Letterman s.n. | 12 Apr 1884 - 30 Jun 1884 | United States of America | Missouri | Saint Louis Co. | — | 2488033 |
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| Acer rubrum L. | G. W. Letterman s.n. | 05 Apr 1884 - 28 Jun 1884 | United States of America | Missouri | Saint Louis Co. | — | 2488122 |
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| Acer rubrum L. | G. W. Letterman s.n. | 10 Apr 1884 | United States of America | Missouri | Saint Louis Co. | — | 2488233 |
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| Acer rubrum var. drummondii (Hook. & Arn. ex Nutt.) Sarg. | G. W. Letterman s.n. | 23 Jul 1882 | United States of America | Texas | Harrison Co. | — | 2488405 |
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| Acer rubrum var. drummondii (Hook. & Arn. ex Nutt.) Sarg. | G. W. Letterman s.n. | 05 Sep 1882 | United States of America | Missouri | Poplar Bluff S.E. Mo. | — | 2488432 |
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| Acer rubrum var. drummondii (Hook. & Arn. ex Nutt.) Sarg. | G. W. Letterman s.n. | Aug 1882 | United States of America | Arkansas | Jackson Co. | — | 2488435 |
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| Acer saccharum Marshall | G. W. Letterman s.n. | 10 Jul 1882 | United States of America | Missouri | Saint Louis Co. Allenton | — | 2488826 |
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| Acer saccharum Marshall | G. W. Letterman s.n. | Apr 1884 | United States of America | Missouri | Saint Louis Co. | — | 2488873 |
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| Acer saccharum Marshall | G. W. Letterman s.n. | 15 Jul 1889 | United States of America | Missouri | Saint Louis Co. Alt: 500… | — | 2488874 |
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| Acer saccharum Marshall | G. W. Letterman s.n. | 01 Jul 1882 | United States of America | Missouri | Saint Louis Co. Alt: 500… | — | 2488875 |
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| Acer saccharum Marshall | G. W. Letterman s.n. | 10 Apr 1884 - 30 Jun 1884 | United States of America | Missouri | Saint Louis Co. | — | 2488876 |
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| Acer saccharum subsp. floridanum (Chapm.) Desmarais | G. W. Letterman s.n. | 28 Jun 1884 | United States of America | Missouri | Saint Louis Co. Alt: 500… | — | 2489245 |
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| Acer stenocarpum Britton | G. W. Letterman | Leaves, May 1884; Fruit 1 Jul 1884 | United States of America | Missouri | Saint Louis Co. | type | 337673 |
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| Achnatherum lettermanii (Vasey) Barkworth | G. W. Letterman s.n. | 14 Aug 1885 | United States of America | Colorado | Kelso Mt. near Jorrey's Peak. | — | 1487231 |
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| Acmella repens (Walter) Rich. | G. W. Letterman s.n. | 10 Aug 1879 | United States of America | Arkansas | Pulaski Co. | — | 1866784 |
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| Acmella repens (Walter) Rich. | G. W. Letterman s.n. | 30 Aug 1879 | United States of America | Arkansas | Pulaski Co. | — | 1866793 |
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