Displaying 1 - 50 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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| Acmella repens (Walter) Rich. | G. W. Letterman s.n. | 19 Oct 1894 | United States of America | Texas | Bowie Co. | — | 1866760 |
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| Aesculus glabra Willd. | G. W. Letterman s.n. | — | United States of America | Texas | Dallas Co. | — | 2497562 |
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| Aesculus glabra Willd. | G. W. Letterman s.n. | May 1880 | United States of America | Missouri | Allenton. | — | 2497486 |
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| Agalinis fasciculata (Elliott) Raf. | G. W. Letterman s.n. | 21 Oct 1894 | United States of America | Arkansas | Miller Co. | — | 3250124 |
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| Agropyron Gaertn. | G. W. Letterman s.n. | 20 Aug 1884 | United States of America | Colorado | Denver | — | 1554459 |
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| Agrostis exarata Trin. | G. W. Letterman s.n. | 30 Jul 1886 | United States of America | Colorado | Boulder Co. Penn's Gulch. | — | 1555365 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | G. W. Letterman s.n. | 06 Jun 1898 | United States of America | Missouri | Saint Louis Co. | — | 1555893 |
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| Agrostis perennans (Walter) Tuck. | G. W. Letterman s.n. | Oct 1892 | United States of America | Missouri | Near Allenton | — | 1557090 |
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| Agrostis perennans (Walter) Tuck. | G. W. Letterman s.n. | Aug 1876 | United States of America | Missouri | Allenton | — | 1557091 |
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| Agrostis perennans (Walter) Tuck. | G. W. Letterman s.n. | 27 Aug 1912 | United States of America | Missouri | Allenton | — | 1557096 |
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| Agrostis stolonifera L. | G. W. Letterman s.n. | 05 Jul 1894 | United States of America | Missouri | Allenton | — | 1533104 |
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| Agrostis stolonifera L. | G. W. Letterman s.n. | 30 Jun 1883 | United States of America | Missouri | Allenton | — | 1533105 |
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| Alopecurus aequalis Sobol. | G. W. Letterman s.n. | Jun 1883 | United States of America | Missouri | Near Pacific. | — | 1637664 |
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| Alopecurus carolinianus Walter | G. W. Letterman s.n. | 21 May 1898 | United States of America | Missouri | Allenton | — | 1637869 |
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| Alopecurus carolinianus Walter | G. W. Letterman s.n. | May 1883 | United States of America | Missouri | Allenton | — | 1637875 |
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| Aloysia gratissima (Gillies & Hook.) Tronc. var. gratissima | G. W. Letterman 5476 | 26 Jul 1882 | United States of America | Texas | Travis Co. near Austin | — | 3520609 |
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| Amblystegium varium (Hedw.) Lindb. | G. W. Letterman 773 | Apr 1905 | United States of America | Missouri | Saint Louis Co. | — | 536773 | ||
| Amorpha canescens Pursh | G. W. Letterman s.n. | Jun 1884 | United States of America | Missouri | Saint Louis Co. | — | 2558837 |
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| Amorpha canescens Pursh | G. W. Letterman s.n. | 12 Jun 1911 | United States of America | Missouri | Saint Louis Co. | — | 2558838 |
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| Amorpha fruticosa L. | G. W. Letterman s.n. | 1897 | United States of America | Missouri | Saint Louis Co. | — | 2559217 |
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| Ampelopsis arborea (L.) Koehne | G. W. Letterman s.n. | 24 Oct 1894 | United States of America | Arkansas | Saline Co. | — | 3841325 |
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| Amsonia hubrichtii Woodson | G. W. Letterman s.n. | 05 Aug 1879 | United States of America | Arkansas | Garland Co. | — | 4160849 |
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| Andropogon gerardii Vitman | G. W. Letterman s.n. | 15 Aug 1883 | United States of America | Missouri | Allenton | — | 1639187 |
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| Andropogon ternarius Michx. | G. W. Letterman s.n. | s.d. | United States of America | Texas | Callahan Co. | — | 1640026 |
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| Andropogon virginicus L. | G. W. Letterman s.n. | 10 Oct 1894 | United States of America | Texas | Bowie Co. | — | 1640409 |
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