Displaying 1 - 75 out of 7125 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Neckera eucarpa Schimp. ex Müll.Hal. | R. S. Williams 2808 | 04 May 1902 | Bolivia | — | Pelichuco | — |
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| Nypa fruticans Wurmb | R. S. Williams 3063 | 17 Jul 1905 | Philippines | — | Davao. S.E. Mindanao. | — |
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| Carex concinna R.Br. | R. S. Williams s.n. | 16 Jun 1899 | Canada | Yukon | Dawson. | — |
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| Carex lugens Holm | R. S. Williams s.n. | 14 Jun 1899 | Canada | Yukon | Dawson Swamp | — |
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| Carex lugens Holm | R. S. Williams s.n. | 18 Jun 1899 | Canada | Yukon | Mouth of Bonanza | — |
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| Polyporus grammocephalus Berk. | R. S. Williams s.n. | May 1905 | — | — | — |
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| Carex lugens Holm | R. S. Williams s.n. | 18 Jun 1899 | Canada | Yukon | Mouth of Bonanza | — |
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| Bryum abditum R.S.Williams | R. S. Williams 3170 | Sep 1904 | Philippines | — | Baguio | type |
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| Grimmia longirostris Hook. | R. S. Williams 2815 | 04 May 1902 | Bolivia | — | Pelichuco. | — |
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| Carex capillaris L. | R. S. Williams s.n. | 01 Aug 1899 | Canada | Yukon | Dawson Swamp. | — |
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| Sargassum | R. S. Williams B | 03 Apr 1904 | Philippines | Bataan | Manila Bay, Mouth of Lamao… | — |
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| Polyporus grammocephalus Berk. | R. S. Williams s.n. | May 1905 | — | — | — |
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| Grimmia longirostris Hook. | R. S. Williams 2818 | 23 Aug 1901 | Bolivia | — | La Paz. | — |
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| Ceropegia merrilli Schltr. | R. S. Williams 941 | 08 Sep 1904 | Philippines | Benguet | Twin Peaks, Northern Luzon | — |
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| Ceropegia merrilli Schltr. | R. S. Williams 941 | 08 Sep 1904 | Philippines | Benguet | Twin Peaks, Northern Luzon | — |
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| Carex capitata L. | R. S. Williams s.n. | 14 Jun 1899 | Canada | Yukon | Dawson Swamp. | — |
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| Adiantum orbignyanum Kuhn | R. S. Williams 2620 | 02 Sep 1901 | Bolivia | La Paz | Sorata | — |
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| Usnea inanis Motyka | R. S. Williams 2250 | 20 Feb 1960 | Bolivia | La Paz | Tumupasa, Western Bolivia. | — |
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| Usnea cirrosa Motyka | R. S. Williams s.n. | 04 Sep 1901 | Bolivia | La Paz | Sorata, foot of the Illampu.… | — |
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| Frullania crinoidea Steph. | R. S. Williams 2199 | 10 Feb 1902 | Bolivia | La Paz | Tigre Pata, San José to… | — |
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| Frullania crinoidea Steph. | R. S. Williams 2192 | 10 Feb 1902 | Bolivia | La Paz | Tigre Pata, San José to… | — |
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| Polytrichum juniperinum Hedw. | R. S. Williams 1930 | 03 Sep 1901 | Bolivia | La Paz | Sorata | — |
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| Sargassum | R. S. Williams s.n. | 03 Dec 1903 | Philippines | Bataan | Lamao, Mt. Mariveles, Prov. Bataan,… | — |
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| Carex capillaris L. | R. S. Williams s.n. | 16 Jun 1899 | Canada | Yukon | Dawson. | — |
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| Dioscorea oblongifolia Rusby | R. S. Williams 1491 | 22 Jul 1902 | Bolivia | La Paz | Franz Tamayo Prov. | holotype |
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| Bactris faucium Mart. | R. S. Williams 392 | 1901 - 1902 | Bolivia | — | — |
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| Arenga saccharifera Labill. | R. S. Williams 2067 | 14 Jan 1905 | Philippines | — | Los Baños | — |
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| Entodon beyrichii (Schwägr.) Müll.Hal. | R. S. Williams 1972 | 27 Jun 1902 | Bolivia | La Paz | Franz Tamayo Prov. | — |
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| Macromitrium atroviride R.S.Williams | R. S. Williams 1822 | 17 Apr 1902 | Bolivia | La Paz | Franz Tamayo Prov. | holotype |
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| Carex capillaris L. | R. S. Williams s.n. | 16 Jul 1899 | Canada | Yukon | Dawson. | — |
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| Sargassum | R. S. Williams s.n. | 03 Dec 1903 | Philippines | Bataan | Lamao, Mt. Mariveles, Prov. Bataan,… | — |
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| Chara globularis Thuill. | R. S. Williams 3 | 25 Aug 1891 | United States of America | Montana | Cascade Co. Lower Sand Coulee | — |
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| Weinmannia sessilifolia Rusby | R. S. Williams 1522 | 29 Jul 1902 | Bolivia | — | Cargadira | holotype |
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| Weinmannia bullata Rusby | R. S. Williams 1571 | 29 Jul 1902 | Bolivia | — | Cargadira | holotype |
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| Weinmannia obtusifolia Rusby | R. S. Williams 1438 | 13 Jul 1902 | Bolivia | — | Apolo | type |
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| Polygala rhodoptera Mart. ex A.W.Benn. | R. S. Williams | 04 Mar 1902 | Bolivia | — | Prairie | — |
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| Calamus | R. S. Williams 2610 | 05 Apr 1905 | Philippines | — | Todaya, Mt. Apo, S. E.… | — |
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| Carex norvegica Retz. | R. S. Williams s.n. | 16 Jun 1899 | Canada | Yukon | Dawson. | — |
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| Carex rostrata Stokes | R. S. Williams s.n. | 20 Mar 1899 | Canada | Yukon | Dawson. | — |
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| Carex filifolia Nutt. | R. S. Williams s.n. | 12 Jun 1895 | Canada | Yukon | Miles Canon | — |
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| Carex capitata L. | R. S. Williams s.n. | 12 Jun 1899 | Canada | Yukon | Ten miles above Lebarge. | — |
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| Porella dentata (Hartm.) Lindb. | R. S. Williams | 29 Nov 1894 | United States of America | Montana | Flathead Co. | — |
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| Sargassum | R. S. Williams s.n. | 03 Apr 1904 | Philippines | Bataan | Manila Bay, Mouth of Lamao… | — |
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| Sematophyllum subpinnatum (Brid.) E.Britton | R. S. Williams 2119 | 12 Jun 1902 | Bolivia | — | Consata | — |
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| Carex aurea Nutt. | R. S. Williams s.n. | 12 Jun 1899 | Canada | Yukon | Ten miles above Lebarge. | — |
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| Poa glauca Vahl | R. S. Williams s.n. | 14 Jul 1899 | Canada | Yukon | Dawson. | — |
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| Crepidotus mollis (Schaeff.:Fr.) Staude | R. S. Williams s.n. | s.d. | — | — | — |
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| Sargassum | R. S. Williams s.n. | 03 Apr 1904 | Philippines | Bataan | Manila Bay, Mouth of Lamao… | — |
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| Poa glauca Vahl | R. S. Williams s.n. | 03 Aug 1899 | Canada | Yukon | Dawson. | — |
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| Hexagonia papyracea Berk. | R. S. Williams | 10 Jan 1902 | — | — | — |
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| Sargassum | R. S. Williams 1119 | 30 Jun 1908 | Panama | — | Colón | — |
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| Sargassum | R. S. Williams 1118a | 30 Jun 1908 | Panama | — | Colón | — |
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| Polyporus grammocephalus Berk. | R. S. Williams s.n. | 1905 | — | — | — |
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| Nypa fruticans Wurmb | R. S. Williams 3063 | 17 Jul 1905 | Philippines | — | Davao. S.E. Mindanao. | — |
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| Hippeastrum crociflorum Rusby | R. S. Williams 1617 | 09 Aug 1902 | Bolivia | — | Guarratuma Rio. | type |
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| Encelia pilocarpa Rusby | R. S. Williams 2526 | 08 Aug 1901 | Peru | — | Arequipa | type |
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| Franseria recurva Rusby | R. S. Williams 2527 | 08 Aug 1901 | Peru | — | Arequipa | holotype |
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| Cleome panamensis Standl. | R. S. Williams 993 | 03 Apr 1908-09 Apr 1908 | Panama | — | Marraganti and vicinity. | type |
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| Grimmia brittoniae R.S.Williams | R. S. Williams | 22 May 1897 | United States of America | Montana | Flathead Co. Near Columbia Falls | — |
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| Acrocephalus spicatus C.B.Rob. | R. S. Williams 2954 | 01 Jul 1905 | Philippines | Davao del Sur | Santa Cruz | isotype |
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| Acrocephalus spicatus C.B.Rob. | R. S. Williams 2954 | 01 Jul 1905 | Philippines | Davao del Sur | Santa Cruz | type |
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| Vernonia ixiamensis Rusby | R. S. Williams 284 | 24 Dec 1901 | Bolivia | — | Ixiamas | holotype |
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| Impatiens merrillii Hook.f. | R. S. Williams 3032 | 05 Jul 1905 | Philippines | Davao del Sur | Mtn. near Santa Cruz, S.… | — |
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| Astragalus williamsii Rydb. | R. S. Williams s.n. | 22 Aug 1899 | Canada | Yukon | Near Big Salmon. | holotype |
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| Astragalus williamsii Rydb. | R. S. Williams s.n. | 22 Aug 1899 | Canada | Yukon | Near Big Salmon. | holotype |
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| Phyllanthus acuminatissimus C.B.Rob. | R. S. Williams 2807 | 16 May 1905 | Philippines | Davao del Sur | Santa Cruz, SE Mindanao | type |
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| Florestina humilis Rusby | R. S. Williams 2511 | 15 May 1902 | Peru | — | Juliaca | type |
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| Mitrephora williamsii C.B.Rob. | R. S. Williams 2188 | 03 Mar 1905 | Philippines | — | Sax River, Prov. Zamboanga | lectotype |
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| Mitrephora williamsii C.B.Rob. | R. S. Williams 2188 | 03 Mar 1905 | Philippines | — | Sax River, Prov. Zamboanga | isotype |
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| Archidendron ellipticum subsp. cordifoliolatum I.C.Nielsen | R. S. Williams 2094 | 04 Feb 1905 | Philippines | — | Sax River, Prov. Zamboanga | type |
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| Archidendron ellipticum subsp. cordifoliolatum I.C.Nielsen | R. S. Williams 2094 | 04 Feb 1905 | Philippines | — | Sax River, Prov. Zamboanga | isotype |
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| Archidendron ellipticum subsp. cordifoliolatum I.C.Nielsen | R. S. Williams 2094 | 04 Feb 1905 | Philippines | — | Sax River, Prov. Zamboanga | holotype |
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| Solanum caricaefolium Rusby | R. S. Williams 648 | 12 Nov 1901 | Bolivia | — | San Buena Ventura | type |
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| Cymbopetalum monospermum Rusby | R. S. Williams 670 | 12 Nov 1901 | Bolivia | — | San Buena Ventura | holotype |
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| Phthirusa heterophylla Rusby | R. S. Williams 667 | 13 Nov 1901 | Bolivia | — | San Buena Ventura | holotype |
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