Displaying 26 - 75 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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| Puccinia podophylli Schwein. | T. A. Williams s.n. | 07 May 1899 | United States of America | District of Columbia | Rock Creek | — | 3413060 |
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| Puccinia polygoni-amphibii Pers. | T. A. Williams s.n. | 10 Oct 1890 | United States of America | Nebraska | Saunders Co. | — | 3414014 |
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| Puccinia minussensis Thüm. | T. A. Williams s.n. | 29 May 1894 | United States of America | South Dakota | Brookings Co. | — | 3410306 |
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| Puccinia recondita Roberge ex Desm. | T. A. Williams s.n. | 19 Sep 1896 | United States of America | South Dakota | Brookings Co. | — | 3441346 |
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| Phyllachora paspalicola Henn. | T. A. Williams s.n. | 25 Sep 1897 | United States of America | District of Columbia | Rock Creek | — | 3388595 |
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| Phyllachora graminis (Pers.:Fr.) Fuckel | T. A. Williams s.n. | 13 Oct 1897 | United States of America | Maryland | Glen Sligo | — | 3387363 |
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| Phyllachora panici (Schwein.) Sacc. | T. A. Williams s.n. | 13 Oct 1897 | United States of America | Maryland | Glen Sligo | — | 3388246 |
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| Puccinia obtecta Peck | T. A. Williams s.n. | 08 Aug 1889 | United States of America | Nebraska | Weeping Water. | — | 3411228 |
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| Puccinia micranthae Griffiths | T. A. Williams s.n. | Sep 1892 | United States of America | North Dakota | Forest City. | — | 3410151 |
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| Puccinia recondita Roberge ex Desm. | T. A. Williams s.n. | 19 Sep 1891 | United States of America | South Dakota | Brookings. | — | 3441345 |
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| Tranzschelia pruni-spinosae (Pers.) Dietel | T. A. Williams s.n. | 16 Sep 1892 | United States of America | South Dakota | Brookings. | — | 3414639 |
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| Puccinia pimpinellae (F.Strauss) Röhl. | T. A. Williams s.n. | 08 Jun 1895 | United States of America | South Dakota | Lake Hendricks. | — | 3412527 |
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| Puccinia punctata Link | T. A. Williams s.n. | 15 Jun 1895 | United States of America | South Dakota | Big Stone. | — | 3415317 |
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| Puccinia menthae Pers. var. menthae | T. A. Williams s.n. | s.d. | United States of America | South Dakota | Peno Hills. | — | 3409908 |
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| Silene latifolia subsp. alba (Mill.) Greuter & Burdet | T. A. Williams s.n. | 08 Aug 1899 | United States of America | District of Columbia | Tacoma Park | — | 3314553 |
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| Myriopteris gracilis Fée | T. A. Williams s.n. | 17 Aug 1891 | United States of America | South Dakota | Pennington Co. Black Hills | — | 3493868 |
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| Thelesperma subnudum var. subnudum | T. A. Williams s.n. | 04 Jun 1900 | United States of America | Colorado | Near Bareta | — | 3164796 |
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| Townsendia grandiflora Nutt. | T. A. Williams s.n. | 23 Jun 1890 | United States of America | Nebraska | War Bonnet Cañon | — | 2922898 |
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| Psoralidium tenuiflorum (Pursh) Rydb. | T. A. Williams s.n. | Aug 1891 | United States of America | South Dakota | Pennington Co. | — | 2621863 |
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| Erigeron formosissimus Greene var. formosissimus | T. A. Williams 613 | 06 Aug 1891 | United States of America | South Dakota | Pennington Co. Rapid City; canyons | — | 2089460 |
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| Erigeron strigosus Muhl. ex Willd. var. strigosus | T. A. Williams s.n. | — | United States of America | Wyoming | Wind River | — | 2096263 |
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| Erigeron pumilus Nutt. subsp. pumilus | T. A. Williams s.n. | 24 Jun 1890 | United States of America | Nebraska | Sioux Co. War Bonnet Canyon;… | — | 2094705 |
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| Potamogeton richardsonii (A.Benn.) Rydb. | T. A. Williams s.n. | 26 Aug 1892 | United States of America | South Dakota | Big Stone Lake | — | 3716021 |
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| Quercus gambelii Nutt. | T. A. Williams s.n. | Jul 1897 | United States of America | Wyoming | Deer Creek | — | 1484565 |
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| Danthonia californica Bol. | T. A. Williams 2796 | 03 Aug 1897 | United States of America | Wyoming | Powder River at & near… | — | 1587573 |
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