Displaying 576 - 600 out of 697 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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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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| Rhinotropis lindheimeri (A.Gray) J.R.Abbott var. lindheimeri | G. W. Letterman s.n. | 10 Aug 1882 | United States of America | Texas | Callahan Co. | — |
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| Rhus copallinum var. copallinum | G. W. Letterman s.n. | 01 Aug 1894 | United States of America | Missouri | Allenton. | — |
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| Rhynchosia latifolia Nutt. ex Torr. & A.Gray | G. W. Letterman s.n. | 02 Aug 1879 | United States of America | Arkansas | Garland Co. | — |
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| Rhynchospora corniculata (Lam.) A.Gray | G. W. Letterman s.n. | 15 Oct 1894 | United States of America | Arkansas | Miller Co. | — |
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| Rhynchospora glomerata (L.) Vahl | G. W. Letterman s.n. | 14 Aug 1886 | United States of America | Kansas | Finney Co. | — |
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| Rivina humilis L. | G. W. Letterman 5474a | 26 Jul 1880 | United States of America | Texas | Dallas Co. | — |
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| Rorippa curvipes var. truncata (Jeps.) Rollins | G. W. Letterman s.n. | 11 Jun 1895 | United States of America | Illinois | Saint Clair Co. | — |
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| Rorippa sessiliflora (Nutt.) Hitchc. | G. W. Letterman s.n. | 17 Jun 1895 | United States of America | Missouri | Saint Louis Co. Near Allenton | — |
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| Rorippa sinuata (Nutt.) Hitchc. | G. W. Letterman s.n. | 15 May 1896 | United States of America | Missouri | Saint Louis Co. | — |
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| Rudbeckia hirta var. angustifolia (T.V.Moore) Perdue | G. W. Letterman 5489 | 10 Aug 1880 | United States of America | Texas | Orange 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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| Ruellia pedunculata Torr. ex A.Gray | G. W. Letterman s.n. | Aug 1879 | United States of America | Arkansas | Garland Co. | — |
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| Sabatia campestris Nutt. | G. W. Letterman 317 | 10 Jul 1880 | United States of America | Kansas | Labette Co. | — |
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| Sabatia campestris Nutt. | G. W. Letterman s.n. | 10 Jul 1880 | United States of America | Kansas | Labette Co. | — |
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| Salicornia bigelovii Torr. | G. W. Letterman s.n. | 01 Aug 1880 | United States of America | Texas | Galveston Co. | — |
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| Salix caroliniana Michx. | G. W. Letterman s.n. | 01 Jul 1884 | United States of America | Missouri | Saint Louis Co. Allenton. | — |
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| Salix caroliniana Michx. | G. W. Letterman s.n. | May 1890 | United States of America | Missouri | Saint Louis Co. Allenton. | — |
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| Salix caroliniana Michx. | G. W. Letterman s.n. | May 1890 | United States of America | Missouri | Saint Louis Co. Allenton. | — |
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| Salix eriocephala var. eriocephala | G. W. Letterman s.n. | July 1884 | United States of America | Missouri | Saint Louis Co. Allenton. | — |
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| Salix nigra Marshall | G. W. Letterman s.n. | 18 Jun 1911 | United States of America | Missouri | Saint Louis Co. | — |
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| Salvia lyrata L. | G. W. Letterman s.n. | 20 Oct 1894 | United States of America | Texas | Bowie Co. | — |
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| Satureja nepeta (L.) Scheele | G. W. Letterman s.n. | 24 Oct 1894 | United States of America | Arkansas | Saline Co. | — |
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| Saxifraga adscendens L. | G. W. Letterman s.n. | 05 Aug 1886 | United States of America | Colorado | Kenosho | — |
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| Saxifraga adscendens L. | G. W. Letterman 1505506 | 15 Aug 1885 | United States of America | Colorado | Gray's Peak | — |
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