Displaying 1 - 50 out of 4457 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Allium brevistylum S.Watson | F. Tweedy 3518 | 20 Jul 1900 - 15 Aug 1900 | United States of America | Alaska | Eastern slope of the Big… | — | 3761821 |
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| Romanzoffia sitchensis Bong. | F. Tweedy s.n. | 18 Jul 1887 | Canada | British Columbia | Mt. Arrowsmith. Van. [Vancouver] Island | — | 3211353 |
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| Ericameria discoidea var. discoidea | F. Tweedy 722 | Sep 1885 | United States of America | California | Near Yellowstone Lake. | — | 2075575 |
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| Penstemon strictus Benth. | F. Tweedy 4298 | 07 Jul 1901 | United States of America | Colorado | Jackson Co. Pearl, Colorado-Wyoming line | — | 661509 |
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| Stellaria longifolia Muhl. ex Willd. | F. Tweedy 5525 | June 20th - July 10th, 1903 | United States of America | Colorado | Gilpin Co. Eldora to Baltimore | — | 453200 |
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| Penstemon secundiflorus Benth. ex A.DC. | F. Tweedy 5712 | 15 Jul 1903-25 Jul 1903 | United States of America | Colorado | Clear Creek Co. Empire | — | 651857 |
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| Penstemon secundiflorus Benth. ex A.DC. | F. Tweedy 5713 | 15 Jul 1903-25 Jul 1903 | United States of America | Colorado | Clear Creek Co. Empire | — | 651858 |
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| Alyssum alyssoides (L.) L. | F. Tweedy 5593 | Jun 1903 | United States of America | Colorado | Boulder Co. Near Boulder | — | 785928 |
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| Penstemon saxosorum Pennell | F. Tweedy 4299 | 04 Jul 1901 | United States of America | Colorado | Hahn's Peak | — | 651568 |
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| Aragallus patens Rydb. | F. Tweedy 5164 | Jul 1902 | United States of America | Colorado | Boulder Co. Plains and foothills… | holotype | 5197 |
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| Penstemon cyathophorus Rydb. | F. Tweedy 4307 | 09 Jul 1901 | United States of America | Colorado | Jackson Co. Colorado-Wyoming line. | holotype | 91062 |
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| Draba chrysantha var. hirtacaulis O.E.Schulz | F. Tweedy 142 | 20 Aug 1894 | United States of America | Colorado | San Miguel Co. Telluride | isolectotype | 185262 |
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| Onosmodium molle var. occidentale (Mack.) I.M.Johnst. | F. Tweedy 5216 | Jul 1902 | United States of America | Colorado | Boulder Co. Longmont | — | 21635 |
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| Carduus griseus Rydb. | F. Tweedy 321 | Aug 1894 | United States of America | Colorado | Telluride | isotype | 163062 |
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| Arenaria tweedyi Rydb. | F. Tweedy s.n. | 15 Jul 1896 | United States of America | Colorado | La Plata Mountains | type | 342433 |
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| Juniperus communis L. | F. Tweedy 5041 | Aug 1902 | United States of America | Colorado | Boulder Co. Mountains between Sunshine… | — | 21422 |
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| Penstemon oreophilus Rydb. | F. Tweedy 5711 | 20 Jun 1903-10 Jul 1903 | United States of America | Colorado | Gilpin Co. Eldora to Baltimore | holotype | 130457 |
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| Pseudotsuga menziesii var. glauca (Beissn.) Franco | F. Tweedy 5040 | Jul 1902 | United States of America | Colorado | Boulder Co. Plaisn and foothills… | — | 63705 |
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| Convolvulus arvensis L. | F. Tweedy 4954 | Jul 1902 | United States of America | Colorado | Boulder Co. Near Boulder | — | 643024 |
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| Carduus erosus Rydb. | F. Tweedy 517 | 25 Jul 1896 | United States of America | Colorado | La Plata Co. | isotype | 163057 |
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| Juniperus scopulorum Sarg. | F. Tweedy 5042 | Jul 1902 | United States of America | Colorado | Boulder Co. Near Boulder | — | 18160 |
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| Bromus tectorum L. | F. Tweedy 4802 | Jul 1902 | United States of America | Colorado | Boulder Co. Longmont | — | 664574 |
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| Bromus tectorum L. | F. Tweedy 4801 | Jul 1902 | United States of America | Colorado | Boulder Co. Near Boulder | — | 664575 |
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| Geranium gracilentum Greene ex Rydb. | F. Tweedy 4592 | 03 Jul 1901 | United States of America | Colorado | Columbine | syntype | 373631 |
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| Penstemon virgatus var. asa-grayi (Crosswh.) Dorn | F. Tweedy 5714A | 20 Jun 1903-10 Jul 1903 | United States of America | Colorado | Gilpin Co. Eldora to Baltimore | — | 763325 |
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| Penstemon virgatus var. asa-grayi (Crosswh.) Dorn | F. Tweedy 5714 | 15 Jul 1903-25 Jul 1903 | United States of America | Colorado | Clear Creek Co. Empire | — | 763326 |
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| Penstemon virgatus var. asa-grayi (Crosswh.) Dorn | F. Tweedy 5198 | Jul 1902 | United States of America | Colorado | Boulder Co. Near Boulder | — | 763324 |
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| Penstemon rydbergii A.Nelson var. rydbergii | F. Tweedy 5721 | 20 Jun 1903-10 Jul 1903 | United States of America | Colorado | Gilpin Co. Eldora to Baltimore | — | 651445 |
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| Penstemon rydbergii A.Nelson var. rydbergii | F. Tweedy 4302 | 03 Jul 1901 | United States of America | Colorado | Columbine, northern Colorado | — | 651444 |
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| Penstemon whippleanus A.Gray | F. Tweedy 5719 | Jul 1903 | United States of America | Colorado | Grand Co. Berthoud Pass | — | 771721 |
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| Penstemon whippleanus A.Gray | F. Tweedy 4300 | 04 Jul 1901 | United States of America | Colorado | Hahns Peak | — | 771720 |
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| Penstemon whippleanus A.Gray | F. Tweedy 5720 | 20 Jun 1903-10 Jul 1903 | United States of America | Colorado | Gilpin Co. Eldora to Baltimore | — | 771722 |
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| Chrysopsis amplifolia Rydb. | F. Tweedy 4898 | Jul 1902 | United States of America | Colorado | Plains and foothills near Boulder:… | holotype | 163180 |
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| Penstemon glaber Pursh var. glaber | F. Tweedy 5710 | 20 Jun 1903-10 Jul 1903 | United States of America | Colorado | Gilpin Co. Eldora to Baltimore | — | 600265 |
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| Trifolium stenolobum Rydb. | F. Tweedy 457 | 15 Jul 1896 | United States of America | Colorado | La Plata Mts | isotype | 50579 |
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| Acrolasia latifolia Rydb. | F. Tweedy 5149 | Aug 1902 | United States of America | Colorado | Mountains between Sunshine and Ward. | holotype | 112175 |
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| Erodium cicutarium (L.) L'Hér. ex Aiton | F. Tweedy 5538 | Jun 1903 | United States of America | Colorado | Boulder Co. Near Boulder | — | 643597 |
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| Penstemon virens Pennell ex Rydb. | F. Tweedy 5197 | Aug 1902 | United States of America | Colorado | Boulder Co. Mountains between Sunshine… | — | 763217 |
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| Penstemon virens Pennell ex Rydb. | F. Tweedy 5718 | 20 Jun 1903-10 Jul 1903 | United States of America | Colorado | Gilpin Co. Eldora to Baltimore | — | 763196 |
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| Penstemon virens Pennell ex Rydb. | F. Tweedy 5715 | Jun 1903 | United States of America | Colorado | Boulder Co. Near Boulder | — | 763218 |
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| Penstemon virens Pennell ex Rydb. | F. Tweedy 5716 | 15 Jul 1903-25 Jul 1903 | United States of America | Colorado | Clear Creek Co. Empire | — | 763219 |
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| Penstemon virens Pennell ex Rydb. | F. Tweedy 5717 | 15 Jul 1903-25 Jul 1903 | United States of America | Colorado | Clear Creek Co. Empire | — | 763220 |
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| Lupinus argenteus Pursh var. argenteus | F. Tweedy 453 | 18 Jul 1896 | United States of America | Colorado | La Plata Co. | — | 736625 |
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| Solanum triflorum Nutt. | F. Tweedy 5235 | Jul 1902 | United States of America | Colorado | Boulder Co. Near Boulder | — | 00820343 |
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| Solanum rostratum Dunal | F. Tweedy 5233 | Jul 1902 | United States of America | Colorado | Boulder Co. Near Boulder | — | 00820932 |
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| Valeriana capitata subsp. pubicarpa (Rydb.) F.G.Mey. | F. Tweedy 4555 | 03 Jul 1901 | United States of America | Colorado | Hohus Peak | — | 888547 |
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| Elymus arizonicus (Scribn. & J.G.Sm.) Gould | F. Tweedy 4822 | Aug 1902 | United States of America | Colorado | Boulder Co. Mountains between Sunshine… | — | 1597590 |
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| Elymus canadensis L. | F. Tweedy 4817 | Jul 1902 | United States of America | Colorado | Boulder Co. Plains and Foothills… | — | 1654817 |
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| Elymus elymoides subsp. brevifolius (J.G.Sm.) Barkworth | F. Tweedy 4816 | Jul 1902 | United States of America | Colorado | Boulder Co. Mountains between Sunshine… | — | 1673553 |
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| Eragrostis cilianensis (All.) Vignolo ex Janch. | F. Tweedy 4808 | Jul 1902 | United States of America | Colorado | Boulder Co. Plains and Foothills… | — | 1682147 |
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