Displaying 1 - 75 out of 9000 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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| Senna aymara H.S.Irwin & Barneby | R. S. Williams 1679 | 16 Aug 1901 | Bolivia | — | La Paz | — | ||||
| Polyporus grammocephalus Berk. | R. S. Williams s.n. | May 1905 | — | — | — |
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| Senna herzogii var. decipiens Barneby ined. | R. S. Williams 226 | 30 Mar 1902 | Bolivia | La Paz | Rio Locas | — | ||||
| 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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| Nepenthes alata Blanco | R. S. Williams 1012 | 02 Oct 1904 | Philippines | Benguet | Trinidad, Northern Luzon | — | ||||
| Grimmia longirostris Hook. | R. S. Williams 2815 | 04 May 1902 | Bolivia | — | Pelichuco. | — |
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| Nepenthes alata Blanco | R. S. Williams 1012 | 02 Oct 1904 | Philippines | Benguet | Trinidad, Northern Luzon | — | ||||
| Porotrichum explanatum Mitt. | R. S. Williams 1978 | 25 Aug 1902 | Bolivia | Santa Cruz | — | |||||
| Carex capillaris L. | R. S. Williams s.n. | 01 Aug 1899 | Canada | Yukon | Dawson Swamp. | — |
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| Hygrohypnum polare (Lindb.) Loeske | R. S. Williams 773 | 17 May 1898 | Canada | Yukon | Lindeman | — | ||||
| Distichophyllum osterwaldii M.Fleisch. | R. S. Williams 1668 | Oct 1904 | — | — | — | |||||
| 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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| Nepenthes alata Blanco | R. S. Williams 1012 | 02 Oct 1904 | Philippines | Benguet | Trinidad, Northern Luzon | — | ||||
| Daltonia longifolia Taylor | R. S. Williams 1816 | 30 Aug 1902 | Bolivia | — | Santa Bárbara. | — | ||||
| 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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| Didymodon laevigatus (Mitt.) R.H.Zander | R. S. Williams 2844 | 05 May 1902 | Bolivia | La Paz | Franz Tamayo Prov. Pelichuco [Pelechuco] | — | ||||
| Dioscorea oblongifolia Rusby | R. S. Williams 1491 | 22 Jul 1902 | Bolivia | La Paz | Franz Tamayo Prov. | holotype |
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| Mielichhoferia andina Sull. | R. S. Williams 1890 | 24 Aug 1901 | Bolivia | — | Divide between Lake Titicaca and… | — | ||||
| Dendroceros japonicus Steph. | R. S. Williams 1919a | 21 Sep 1904 | Philippines | Benguet | Baguio, northern Luzon | — | ||||
| 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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| Nepenthes alata Blanco | R. S. Williams 644 | 24 Feb 1904 | Philippines | Bataan | Lamao River, Mt. Mariveles, Central… | — | ||||
| Hymenodon angustifolius Sande Lac. | R. S. Williams 2382 | Mar 1905 | Philippines | — | SW Mindanao, Sax river | — | ||||
| 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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| Daltonia longifolia Taylor | R. S. Williams 2751 | 29 Apr 1902 | Bolivia | — | Río Pelichuco | — | ||||
| 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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| Fabaceae | R. S. Williams 132 | 23 Feb 1908-22 Mar 1908 | Panama | — | Penonome and vicinity | — | ||||
| Calamus | R. S. Williams 2610 | 05 Apr 1905 | Philippines | — | Todaya, Mt. Apo, S. E.… | — |
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| Nepenthes alata Blanco | R. S. Williams 2560 | 31 Mar 1905 | Philippines | — | Mt. Apo., S.E. Mindanao: Bojobo:… | — | ||||
| Nepenthes alata Blanco | R. S. Williams 1012 | 02 Oct 1904 | Philippines | Benguet | Trinidad, Northern Luzon | — | ||||
| 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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| Entodon longidens Broth. | R. S. Williams 2651 | Mar 1905 | Philippines | — | S. E. Mindanao. Todaya, Mt.… | — | ||||
| 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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| Nepenthes alata Blanco | R. S. Williams 1012 | 02 Oct 1904 | Philippines | Benguet | Trinidad, Northern Luzon | — | ||||
| 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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