Displaying 51 - 75 out of 696 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Antennaria microphylla Rydb. | G. W. Letterman 200 | 13 Aug 1884 | United States of America | Colorado | El Paso Co. Pikes Peak | — | 1891187 |
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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 | — | 1880503 |
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| Anthoxanthum nitens (Weber) Y.Schouten & Veldkamp | G. W. Letterman s.n. | 1886 | United States of America | Colorado | Gray's Peak | — | 1641162 |
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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. | — | 3997598 |
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| Aquilegia canadensis L. | G. W. Letterman s.n. | May 1884 | United States of America | Arkansas | Clay Co. | — | 2741758 |
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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 | — | 2741953 |
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| Aristida hamulosa Henrard | G. W. Letterman s.n. | Aug 1881 | United States of America | Texas | Tarrant Co. | — | 1474353 |
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| Aristida longespica Poir. | G. W. Letterman s.n. | 18 Oct 1894 | United States of America | Arkansas | Miller Co. | — | 1467613 |
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| Aristida purpurascens Poir. | G. W. Letterman s.n. | 08 Oct 1894 | United States of America | Texas | Bowie Co. | — | 1558241 |
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| Aristida purpurea Nutt. | G. W. Letterman s.n. | 20 Oct 1894 | United States of America | Texas | Bowie Co. | — | 1631923 |
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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. | — | 1632497 |
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| Aristida ramosissima Engelm. ex A.Gray | G. W. Letterman 562 | Jun 1880 | United States of America | Oklahoma | Craig Co. | — | 1632806 |
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| Arnica mollis Hook. | G. W. Letterman s.n. | 05 Aug 1886 | United States of America | Colorado | Long's Peak. | — | 1882727 |
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| Arnica parryi A.Gray | G. W. Letterman s.n. | 04 Aug 1885 | United States of America | Wyoming | National Park. | — | 1883076 |
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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 | — | 1893141 |
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| Artemisia dracunculus L. | G. W. Letterman s.n. | 08 Aug 1886 | United States of America | Colorado | Park Co. | — | 1893937 |
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| Artemisia filifolia Torr. | G. W. Letterman 5497 | 13 Jul 1884 | United States of America | Colorado | Denver Co. near Denver | — | 1894194 |
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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 | — | 1908321 |
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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 | — | 1908429 |
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| Artemisia scopulorum A.Gray | G. W. Letterman s.n. | 15 Aug 1885 | United States of America | Colorado | Gray's Peak | — | 1908773 |
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| Artemisia scopulorum A.Gray | G. W. Letterman s.n. | 23 Jul 1885 | United States of America | Colorado | Gray's Peak | — | 1908847 |
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| Asclepias speciosa Torr. | G. W. Letterman 4492 | 1885 | United States of America | Colorado | Denver Co. | — | 3528585 |
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| Asplenium resiliens Kunze | G. W. Letterman s.n. | s.d. | United States of America | Arkansas | Hot Springs | — | 3522586 |
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| Asplenium resiliens Kunze | G. W. Letterman s.n. | Jul 1879 | United States of America | Arkansas | Garland Co. | — | 3522588 |
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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 | — | 01248547 |
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