Displaying 1 - 75 out of 697 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Abutilon americanum Panz. | G. W. Letterman 5515 | Jul 1882 | United States of America | Texas | Bexar Co. | — |
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| Abutilon texense Torr. & A.Gray | G. W. Letterman s.n. | Aug 1882 | United States of America | Texas | Hays Co. | — |
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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. | — |
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| Acer | G. W. Letterman s.n. | Aug 1883 | — | — | — |
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| Acer negundo L. | G. W. Letterman s.n. | 25 Jun 1884 | United States of America | Missouri | Saint Louis Co. | — |
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| Acer negundo L. | G. W. Letterman s.n. | 18 Jun 1896 | United States of America | Missouri | Saint Louis Co. | — |
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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. | — |
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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. | — |
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| Acer rubrum L. | G. W. Letterman s.n. | Jul 1883 | United States of America | Arkansas | Pulaski Co. | — |
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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. | — |
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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. | — |
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| Acer rubrum L. | G. W. Letterman s.n. | 10 Apr 1884 | United States of America | Missouri | Saint Louis Co. | — |
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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. | — |
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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. | — |
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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. | — |
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| Acer saccharum Marshall | G. W. Letterman s.n. | 10 Jul 1882 | United States of America | Missouri | Saint Louis Co. Allenton | — |
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| Acer saccharum Marshall | G. W. Letterman s.n. | Apr 1884 | United States of America | Missouri | Saint Louis Co. | — |
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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… | — |
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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… | — |
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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. | — |
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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… | — |
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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 |
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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. | — |
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| Acmella repens (Walter) Rich. | G. W. Letterman s.n. | 10 Aug 1879 | United States of America | Arkansas | Pulaski Co. | — |
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| Acmella repens (Walter) Rich. | G. W. Letterman s.n. | 30 Aug 1879 | United States of America | Arkansas | Pulaski Co. | — |
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| Acmella repens (Walter) Rich. | G. W. Letterman s.n. | 19 Oct 1894 | United States of America | Texas | Bowie Co. | — |
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| Aesculus glabra Willd. | G. W. Letterman s.n. | — | United States of America | Texas | Dallas Co. | — |
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| Aesculus glabra Willd. | G. W. Letterman s.n. | May 1880 | United States of America | Missouri | Allenton. | — |
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| Agalinis fasciculata (Elliott) Raf. | G. W. Letterman s.n. | 21 Oct 1894 | United States of America | Arkansas | Miller Co. | — |
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| Agropyron Gaertn. | G. W. Letterman s.n. | 20 Aug 1884 | United States of America | Colorado | Denver | — |
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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. | — |
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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. | — |
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| Agrostis perennans (Walter) Tuck. | G. W. Letterman s.n. | Oct 1892 | United States of America | Missouri | Near Allenton | — |
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| Agrostis perennans (Walter) Tuck. | G. W. Letterman s.n. | Aug 1876 | United States of America | Missouri | Allenton | — |
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| Agrostis perennans (Walter) Tuck. | G. W. Letterman s.n. | 27 Aug 1912 | United States of America | Missouri | Allenton | — |
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| Agrostis stolonifera L. | G. W. Letterman s.n. | 05 Jul 1894 | United States of America | Missouri | Allenton | — |
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| Agrostis stolonifera L. | G. W. Letterman s.n. | 30 Jun 1883 | United States of America | Missouri | Allenton | — |
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| Alopecurus aequalis Sobol. | G. W. Letterman s.n. | Jun 1883 | United States of America | Missouri | Near Pacific. | — |
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| Alopecurus carolinianus Walter | G. W. Letterman s.n. | 21 May 1898 | United States of America | Missouri | Allenton | — |
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| Alopecurus carolinianus Walter | G. W. Letterman s.n. | May 1883 | United States of America | Missouri | Allenton | — |
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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 | — |
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| Amblystegium varium (Hedw.) Lindb. | G. W. Letterman 773 | Apr 1905 | United States of America | Missouri | Saint Louis Co. | — | ||||
| Amorpha canescens Pursh | G. W. Letterman s.n. | Jun 1884 | United States of America | Missouri | Saint Louis Co. | — |
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| Amorpha canescens Pursh | G. W. Letterman s.n. | 12 Jun 1911 | United States of America | Missouri | Saint Louis Co. | — |
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| Amorpha fruticosa L. | G. W. Letterman s.n. | 1897 | United States of America | Missouri | Saint Louis Co. | — |
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| Ampelopsis arborea (L.) Koehne | G. W. Letterman s.n. | 24 Oct 1894 | United States of America | Arkansas | Saline Co. | — |
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| Amsonia hubrichtii Woodson | G. W. Letterman s.n. | 05 Aug 1879 | United States of America | Arkansas | Garland Co. | — |
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| Andropogon gerardii Vitman | G. W. Letterman s.n. | 15 Aug 1883 | United States of America | Missouri | Allenton | — |
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| Andropogon ternarius Michx. | G. W. Letterman s.n. | s.d. | United States of America | Texas | Callahan Co. | — |
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| Andropogon virginicus L. | G. W. Letterman s.n. | 10 Oct 1894 | United States of America | Texas | Bowie Co. | — |
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| Antennaria microphylla Rydb. | G. W. Letterman 200 | 13 Aug 1884 | United States of America | Colorado | El Paso Co. Pikes Peak | — |
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| Antennaria rosea Greene subsp. rosea | G. W. Letterman 200 | 13 Aug 1884 | United States of America | Colorado | El Paso Co. Pike's Peak | — |
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| Anthoxanthum nitens (Weber) Y.Schouten & Veldkamp | G. W. Letterman s.n. | 1886 | United States of America | Colorado | Gray's Peak | — |
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| Aplectrum hyemale (Muhl. ex Willd.) Nutt. | G. W. Letterman s.n. | May 1890 | United States of America | Missouri | Saint Louis Co. | — |
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| Aquilegia canadensis L. | G. W. Letterman s.n. | May 1884 | United States of America | Arkansas | Clay Co. | — |
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| Aquilegia coerulea var. coerulea | G. W. Letterman s.n. | 15 Aug 1885 | United States of America | Colorado | Clear Creek Co. Near Graymont | — |
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| Aristida hamulosa Henrard | G. W. Letterman s.n. | Aug 1881 | United States of America | Texas | Tarrant Co. | — |
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| Aristida longespica Poir. | G. W. Letterman s.n. | 18 Oct 1894 | United States of America | Arkansas | Miller Co. | — |
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| Aristida purpurascens Poir. | G. W. Letterman s.n. | 08 Oct 1894 | United States of America | Texas | Bowie Co. | — |
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| Aristida purpurea Nutt. | G. W. Letterman s.n. | 20 Oct 1894 | United States of America | Texas | Bowie Co. | — |
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| Aristida purpurea var. longiseta (Steud.) Vasey | G. W. Letterman s.n. | 16 Aug 1884 | United States of America | Colorado | El Paso Co. | — |
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| Aristida ramosissima Engelm. ex A.Gray | G. W. Letterman 562 | Jun 1880 | United States of America | Oklahoma | Craig Co. | — |
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| Arnica mollis Hook. | G. W. Letterman s.n. | 05 Aug 1886 | United States of America | Colorado | Long's Peak. | — |
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| Arnica parryi A.Gray | G. W. Letterman s.n. | 04 Aug 1885 | United States of America | Wyoming | National Park. | — |
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| Artemisia campestris var. caudata (Michx.) E.J.Palmer & Steyerm. | G. W. Letterman s.n. | 31 Jul 1886 | United States of America | Colorado | Boulder Co. Boulder Canon | — |
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| Artemisia dracunculus L. | G. W. Letterman s.n. | 08 Aug 1886 | United States of America | Colorado | Park Co. | — |
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| Artemisia filifolia Torr. | G. W. Letterman 5497 | 13 Jul 1884 | United States of America | Colorado | Denver Co. near Denver | — |
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| Artemisia norvegica subsp. saxatilis (Besser) H.M.Hall & Clem. | G. W. Letterman 5498 | Aug 1886 | United States of America | Colorado | Boulder Co. Long's Peak | — |
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| Artemisia norvegica subsp. saxatilis (Besser) H.M.Hall & Clem. | G. W. Letterman s.n. | 21 Jul 1886 | United States of America | Colorado | Gray's Peak | — |
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| Artemisia scopulorum A.Gray | G. W. Letterman s.n. | 15 Aug 1885 | United States of America | Colorado | Gray's Peak | — |
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| Artemisia scopulorum A.Gray | G. W. Letterman s.n. | 23 Jul 1885 | United States of America | Colorado | Gray's Peak | — |
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| Asclepias speciosa Torr. | G. W. Letterman 4492 | 1885 | United States of America | Colorado | Denver Co. | — |
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| Asplenium resiliens Kunze | G. W. Letterman s.n. | s.d. | United States of America | Arkansas | Hot Springs | — |
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| Asplenium resiliens Kunze | G. W. Letterman s.n. | Jul 1879 | United States of America | Arkansas | Garland Co. | — |
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| Astragalus distortus Torr. & A.Gray var. distortus | G. W. Letterman s.n. | 20 May 1887 | United States of America | Missouri | Allerton | — |
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