Displaying 26 - 50 out of 919 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Rosa lyonii Pursh | T. A. Williams s.n. | 04 Jun 1899 | United States of America | District of Columbia | Rock Creek | — | 2856432 |
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| Cyperus flavescens L. | T. A. Williams s.n. | Oct 1898 | United States of America | District of Columbia | Mt. Pleasant | — | 2814380 |
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| Thymus serpyllum L. | T. A. Williams | 15 Jul 1900 | United States of America | District of Columbia | Upper Marlboro, MD. | — | 3135566 |
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| Eupatorium hyssopifolium L. var. hyssopifolium | T. A. Williams | 07 Sep 1900 | United States of America | District of Columbia | Lakoma Park, D.C. | — | 2834580 |
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| Erigeron speciosus var. macranthus (Nutt.) Cronquist | T. A. Williams | 14 Aug 1898 | United States of America | Wyoming | Big Horn Mountains; along North… | — | 2095693 |
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| Erigeron speciosus var. macranthus (Nutt.) Cronquist | T. A. Williams | 10 Aug 1898 | United States of America | Wyoming | Johnson Co. North Fork of… | — | 2095664 |
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| Erigeron caespitosus Nutt. | T. A. Williams | 09 Aug 1898 | United States of America | Wyoming | Big Horn Mountains; dry hills,… | — | 2078163 |
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| Pseudopeziza medicaginis (Lib.) Sacc. | T. A. Williams 5175 | 22 Aug 1908 | United States of America | New Mexico | Pecos. | — | 2974697 |
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| Puccinia hieracii (Röhl.) Mart. | T. A. Williams 6697 | 07 Jul 1911 | United States of America | New Mexico | Chama. | — | 3404902 |
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| Pseudopeziza medicaginis (Lib.) Sacc. | T. A. Williams 8056 | 17 Aug 1911 | United States of America | New Mexico | Cedar Hill. | — | 2974696 |
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| Puccinia extensicola Plowr. | T. A. Williams s.n. | 08 Jul 1893 | United States of America | South Dakota | Brookings. | — | 3400315 |
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| Puccinia graminis Pers. | T. A. Williams s.n. | 07 Aug 1893 | United States of America | South Dakota | Brookings. | — | 3402340 |
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| Puccinia graminis Pers. | T. A. Williams s.n. | 07 Aug 1893 | United States of America | South Dakota | Brookings. | — | 3402357 |
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| Puccinia helianthi Schwein. | T. A. Williams s.n. | 18 Sep 1894 | United States of America | South Dakota | Brookings. | — | 3403514 |
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| Puccinia helianthi Schwein. | T. A. Williams s.n. | 18 Sep 1895 | United States of America | South Dakota | Brookings. | — | 3403516 |
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| Puccinia helianthi Schwein. | T. A. Williams s.n. | 05 Aug 1896 | United States of America | South Dakota | Iroquois. | — | 3403511 |
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| Puccinia intermixta Peck | T. A. Williams s.n. | 02 Jun 1900 | United States of America | New Mexico | Las Vegas. | — | 3406065 |
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| Pseudopeziza medicaginis (Lib.) Sacc. | T. A. Williams s.n. | Aug 1908 | United States of America | New Mexico | Pecos. | — | 2974695 |
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| Mollisia dehnii (Rabenh.) P.Karst. | T. A. Williams s.n. | 26 Jun 1893 | United States of America | South Dakota | Brookings. | — | 2972976 |
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| Puccinia hieracii (Röhl.) Mart. | T. A. Williams s.n. | Sep 1894 | United States of America | South Dakota | Brookings. | — | 3405033 |
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| Puccinia hieracii (Röhl.) Mart. | T. A. Williams s.n. | Sep 1894 | United States of America | South Dakota | Brookings. | — | 3405038 |
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| Carex assiniboinensis W.Boott | T. A. Williams s.n. | 13 Jun 1895 | United States of America | South Dakota | Grant Co. | — | 2782028 |
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| Puccinia menthae Pers. var. menthae | T. A. Williams s.n. | 11 Jul 1891 | United States of America | South Dakota | Brookings Co. | — | 3409911 |
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| Puccinia menthae Pers. var. menthae | T. A. Williams s.n. | 11 Jul 1891 | United States of America | South Dakota | Brookings Co. | — | 3409912 |
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| Puccinia menthae Pers. var. menthae | T. A. Williams s.n. | 11 Jul 1891 | United States of America | South Dakota | Brookings Co. | — | 3409913 |
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