Displaying 1 - 25 out of 882 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Poa arida Vasey | T. A. Williams s.n. | 1891 | United States of America | Arkansas | Bear Kings | — | 1784723 |
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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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| Penstemon auriberbis Pennell | T. A. Williams s.n. | 04 Jun 1900 | United States of America | Colorado | Near Bareta | — | 570974 |
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| Conioselinum scopulorum (A.Gray) J.M.Coult. & Rose | T. A. Williams s.n. | 23 Jul 1896 | United States of America | Colorado | El Paso Co. | — | 3455555 |
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| Dichanthelium polyanthes (Schult.) Mohlenbr. | T. A. Williams | 03 Jul 1898 | United States of America | District of Columbia | Takoma Park | — | 1715146 |
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| Dichanthelium polyanthes (Schult.) Mohlenbr. | T. A. Williams | 17 Jun 1899 | United States of America | District of Columbia | Takoma Park | — | 1715141 |
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| Dichanthelium polyanthes (Schult.) Mohlenbr. | T. A. Williams | 11 Jul 1899 | United States of America | District of Columbia | Takoma Park | — | 1715144 |
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| Rubus enslenii Tratt. | T. A. Williams s.n. | 08 Jul 1899 | United States of America | District of Columbia | Takoma Park | — | 2866394 |
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| Carex debilis Michx. var. debilis | T. A. Williams s.n. | 05 Jun 1898 | United States of America | District of Columbia | Takoma | — | 2781844 |
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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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| 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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| 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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| 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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| Leimonis erratica (Körb.) R.C.Harris & Lendemer | T. A. Williams | 23 Jan 1898 | United States of America | District of Columbia | Takoma Park | — | 1519065 |
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| Carex annectens (E.P.Bicknell) E.P.Bicknell | T. A. Williams s.n. | 26 May 1897 | United States of America | District of Columbia | Takoma Park. | — | 2236285 |
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| Carex allegheniensis Mack. | T. A. Williams s.n. | 06 Jun 1896 | United States of America | District of Columbia | [Lakoma] Park. | — | 2235321 |
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| Carex albicans var. emmonsii (Dewey ex Torr.) Rettig | T. A. Williams s.n. | 25 Apr 1897 | United States of America | District of Columbia | Takoma Park. | — | 2264775 |
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| Carex atlantica L.H.Bailey subsp. atlantica | T. A. Williams s.n. | 24 May 1898 | United States of America | District of Columbia | Takoma Park. | — | 2237574 |
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| Carex brachyglossa Mack. | T. A. Williams s.n. | 26 May 1897 | United States of America | District of Columbia | Takoma Park. | — | 2251771 |
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| Carex cephalophora Muhl. ex Willd. | T. A. Williams s.n. | 30 May 1899 | United States of America | District of Columbia | Sligo. | — | 2254986 |
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| Carex folliculata L. | T. A. Williams s.n. | 03 Jul 1903 | United States of America | District of Columbia | Takoma Park | — | 2276826 |
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| Carex frankii Kunth | T. A. Williams s.n. | 08 Jul 1899 | United States of America | District of Columbia | Takoma Park. | — | 2276965 |
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