Displaying 676 - 697 out of 697 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Palafoxia sphacelata (Nutt. ex Torr.) Cory | G. W. Letterman s.n. | 22 Jul 1880 | United States of America | Texas | Grayson Co. | — |
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| Parthenium hispidum Raf. | G. W. Letterman 251 | 22 Jul 1880 | United States of America | Texas | Grayson Co. | — |
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| Ratibida columnifera (Nutt.) Wooton & Standl. | G. W. Letterman s.n. | Jul 1880 | United States of America | Oklahoma | Muskogee Co. Indian Territory | — |
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| Ratibida columnifera (Nutt.) Wooton & Standl. | G. W. Letterman s.n. | Aug 1882 | United States of America | Texas | Travis Co. | — |
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| Ratibida tagetes (E.James) Barnhart | G. W. Letterman 50 | 22 Aug 1884 | United States of America | Kansas | Wallace Co. | — |
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| Rudbeckia hirta var. pulcherrima Farw. | G. W. Letterman s.n. | 30 Jul 1882 | United States of America | Texas | Travis Co. | — |
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| Bumelia cassinifolia W.Small | G. W. Letterman 287 | 1883, probably May | United States of America | Louisiana | Saint Landry Parish. | holotype |
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| Acer | G. W. Letterman s.n. | Aug 1883 | — | — | — |
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| Astragalus flexuosus (Hook.) Douglas ex G.Don var. flexuosus | G. W. Letterman s.n. | 1881 | United States of America | Colorado | — |
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| Poa arctica R.Br. | G. W. Letterman s.n. | 1886 | United States of America | Colorado | — |
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| Poa fendleriana (Steud.) Vasey | G. W. Letterman s.n. | 1886 | United States of America | Colorado | — |
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| Poa glauca subsp. rupicola (Nash) W.A.Weber | G. W. Letterman 1731 | 1886 | United States of America | Colorado | — |
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| Poa nervosa (Hook.) Vasey | G. W. Letterman 67 | 04 Sep 1875 | United States of America | Wyoming | — |
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| Leucopoa kingii (S.Watson) W.A.Weber | G. W. Letterman s.n. | — | United States of America | Colorado | — |
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| Elymus scribneri (Vasey) M.E.Jones | G. W. Letterman s.n. | — | United States of America | Colorado | — |
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| Piptatherum micranthum (Trin. & Rupr.) Barkworth | G. W. Letterman s.n. | — | United States of America | Colorado | — |
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| Kochia Roth | G. W. Letterman s.n. | s.d. | United States of America | Colorado | — |
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| Leptochloa panicea subsp. brachiata (Steud.) N.Snow | G. W. Letterman s.n. | 1884 | United States of America | Colorado | — |
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| Leptochloa panicea subsp. brachiata (Steud.) N.Snow | G. W. Letterman s.n. | 1884 | United States of America | Colorado | — |
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| Cirsium centaureae (Rydb.) K.Schum. | G. W. Letterman 78 | Jul 1865 | United States of America | Colorado | Penn's Gulch | — |
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| Phacelia purshii var. pushii F.Levy | G. W. Letterman s.n. | 10 May 1884 | United States of America | Arkansas | Pulaski Co. | — |
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| Physaria vitulifera Rydb. | G. W. Letterman s.n. | 07 Aug 1884 | United States of America | Colorado | Teller Co. Near 7 Lakes | — |
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