Displaying 1 - 50 out of 919 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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| 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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| 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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| Lactarius chrysorheus Fr. | T. A. Williams 2601 | 15 Oct 1899 | United States of America | District of Columbia | Washington. Takoma Park | — | 82945 | ||
| Russula mariae Peck | T. A. Williams s.n. | 12 Nov 1899 | United States of America | District of Columbia | Takoma Park | — | 782616 | ||
| Tricholoma portentosum var. centrale Peck | T. A. Williams | 20 Nov 1899 | United States of America | District of Columbia | Takoma Park | — | 518104 | ||
| Russula ochrophylla Peck | T. A. Williams | 25 Sep 1899 | United States of America | District of Columbia | Takoma Park | — | 782671 | ||
| Cladonia apodocarpa Robbins | T. A. Williams 8 | 15 Nov 1896 | United States of America | District of Columbia | Takoma Park | — | 1079806 | ||
| 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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| Carex hirsutella Mack. | T. A. Williams s.n. | 30 May 1898 | United States of America | District of Columbia | Sligo. | — | 2190287 |
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| Carex intumescens Rudge | T. A. Williams s.n. | 30 May 1898 | United States of America | District of Columbia | Sligo | — | 2192466 |
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| Carex intumescens Rudge | T. A. Williams s.n. | 13 Jun 1898 | United States of America | District of Columbia | Takoma Park | — | 2192577 |
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| Carex lurida Wahlenb. | T. A. Williams s.n. | 08 Jul 1899 | United States of America | District of Columbia | Takoma Park. [Inferred county from… | — | 2289273 |
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| Carex lurida Wahlenb. | T. A. Williams s.n. | July 3 | United States of America | District of Columbia | Takoma Park. [Inferred county from… | — | 2289274 |
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| Carex muhlenbergii Schkuhr var. muhlenbergii | T. A. Williams s.n. | 17 Jun 1899 | United States of America | District of Columbia | Takoma Park | — | 2292294 |
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| Carex praegracilis W.Boott | T. A. Williams s.n. | 30 May 1899 | United States of America | District of Columbia | Sligo. | — | 2297642 |
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| Carex laeviconica Dewey | T. A. Williams s.n. | 03 Jul 1903 | United States of America | District of Columbia | Takoma Park | — | 2193502 |
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| Carex laevivaginata (Kük.) Mack. | T. A. Williams s.n. | 23 May 1897 | United States of America | District of Columbia | Old Lay Place | — | 2193600 |
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| Carex laxiflora Lam. | T. A. Williams s.n. | 12 Jun 1897 | United States of America | District of Columbia | Washington. Takoma Park | — | 2195031 |
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| Carex tribuloides var. sangamonensis Clokey | T. A. Williams s.n. | 08 Jul 1899 | United States of America | District of Columbia | Washington. Takoma Park | — | 2307692 |
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| Carex rugosperma Mack. | T. A. Williams s.n. | 26 Mar 1898 | United States of America | District of Columbia | Takoma Heights | — | 2301454 |
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| Carex vulpinoidea Michx. | T. A. Williams s.n. | 08 Jul 1899 | United States of America | District of Columbia | Takoma Park | — | 2310638 |
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| Bacidia schweinitzii (Fr. ex Tuck.) A.Schneid. | T. A. Williams | Dec 1896 | United States of America | District of Columbia | Takoma Park | — | 1542875 |
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| Bacidia schweinitzii (Fr. ex Tuck.) A.Schneid. | T. A. Williams | Dec 1896 | United States of America | District of Columbia | Takoma Park | — | 1542874 |
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| Buellia maculata Bungartz | T. A. Williams s.n. | Dec 1897 | United States of America | District of Columbia | Takoma Park | — | 2466870 | ||
| Agrostis perennans (Walter) Tuck. | T. A. Williams s.n. | 22 May 1899 | United States of America | District of Columbia | Takoma Park. | — | 1556926 |
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| Pertusaria pustulata (Ach.) Duby | T. A. Williams | Apr 1898 | United States of America | District of Columbia | Takoma Park | — | 2467613 | ||
| Pertusaria pustulata (Ach.) Duby | T. A. Williams | Apr 1898 | United States of America | District of Columbia | Takoma Park | — | 2467614 | ||
| Digitaria filiformis (L.) Koeler | T. A. Williams 1553 | 11 Oct 1900 | United States of America | District of Columbia | Takoma Park. | — | 1695856 |
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| Cortinarius alboviolaceus (Fr.) Fr. | T. A. Williams s.n. | 11 Oct 1899 | United States of America | District of Columbia | Rock Creek Park. | — | 1934642 |
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| Cortinarius semisanguineus (Fr.) Gillet | T. A. Williams s.n. | 11 Oct 1899 | United States of America | District of Columbia | Rock Creek Park. | — | 1956137 |
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| Albugo ipomoaea-panduratae (C.Schweinf.) D.B.Swingle | T. A. Williams s.n. | 15 Jul 1899 | United States of America | District of Columbia | Takoma Park | — | 2771865 |
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| Calostoma lutescens (Schwein.) Burnap | T. A. Williams s.n. | 02 Apr 1900 | United States of America | District of Columbia | Takoma Park | — | 01938871 |
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| Mycena pura (Fr.) Kumm. | T. A. Williams s.n. | Oct 1899 | United States of America | District of Columbia | Takoma Park | — | 2764798 |
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