Displaying 1 - 50 out of 1600 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Dermocarpa sphaerica var. galapagensis Setch. & N.L.Gardner | T. J. Howell 576 | 01 Jun 1932 | Ecuador | Galápagos | southeast side of Narborough Island | type |
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| Microseris howellii A.Gray | T. J. Howell s.n. | 04 Jun 1884 | United States of America | Oregon | Waldo | isotype |
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| Microseris howellii A.Gray | T. J. Howell s.n. | 04 Jun 1884 | United States of America | Oregon | Waldo | isotype |
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| Penstemon glandulosus Douglas ex Lindl. var. glandulosus | T. J. Howell s.n. | Jul 1880 | United States of America | Washington | Cimcoe Mountains | — |
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| Grimmia donniana Sm. | T. J. Howell | May 1882 | United States of America | Oregon | Wasco Co. | — | ||||
| Racomitrium lanuginosum (Hedw.) Brid. | T. J. Howell | Mar 1889 | United States of America | Oregon | Clackamas Co. | — | ||||
| Mirabilis greenei S.Watson | T. J. Howell 1389 | Jul 1889 | United States of America | Oregon | Hornbrook | — |
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| Carex marcida var. debilis L.H.Bailey | T. J. Howell 937 | 27 May 1885 | United States of America | Oregon | Harney valley | type |
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| Orthotrichum alpestre Hornsch. ex Bruch & Schimp. | T. J. Howell 10 | May 1885 | United States of America | Oregon | Stien's Mountain | — | ||||
| Poa confinis Vasey | T. J. Howell 69(?) | 17 Jul 1882 | United States of America | Oregon | Tilamook Bay | type |
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| Stipa occidentalis Thurb. | T. J. Howell s.n. | 28 May 1885 | United States of America | Oregon | Harney Valley | — |
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| Draba howellii S.Watson | T. J. Howell s.n. | 16 Jun 1884 | United States of America | California | Siskiyou Mountains | probable isotype |
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| Poa argentea Howell | T. J. Howell s.n. | 18 Jul 1887 | United States of America | Oregon | Top of Ashland Butte, Siskiyou… | isotype |
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| Poa argentea Howell | T. J. Howell s.n. | 18 Jul 1887 | United States of America | Oregon | Top of Ashland Butte, Siskiyou… | isotype |
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| Poa argentea Howell | T. J. Howell s.n. | 18 Jul 1887 | United States of America | Oregon | Top of Ashland Butte, Siskiyou… | isotype |
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| Poa argentea Howell | T. J. Howell s.n. | 18 Jul 1887 | United States of America | Oregon | Top of Ashland Butte, Siskiyou… | isotype |
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| Pleuroziopsis ruthenica (Weinm.) Kindb. ex E.Britton | T. J. Howell 1835 | 25 Aug 1895 | United States of America | Alaska | Ses Bay | — | ||||
| Penstemon glandulosus var. chelanensis (D.D.Keck) Cronquist | T. J. Howell 1517 | 01 May 1891 | United States of America | Washington | Klickitat hills | — |
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| Penstemon glandulosus var. chelanensis (D.D.Keck) Cronquist | T. J. Howell s.n. | Jul 1880 | United States of America | Washington | Cimcoe Mountains | — |
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| Solidago humilis var. nana A.Gray | T. J. Howell s.n. | 08 Aug 1882 | United States of America | Washington | Mount Adams | isolectotype |
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| Calochortus longebarbatus S.Watson | T. J. Howell s.n. | Jun 1881 | United States of America | Washington | Goldendale | not a type |
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| Festuca microstachys var. pauciflora Scribn. | T. J. Howell s.n. | May 1886 | United States of America | Oregon | Near Portland | isotype |
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| Astragalus craigii M.E.Jones | T. J. Howell s.n. | 15 May 1885 | United States of America | Oregon | Gravel bars of the John… | isotype |
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| Bryum atwateriae Müll.Hal. | T. J. Howell 9 | Jun 1884 | United States of America | Oregon | Waldo | — | ||||
| Sphagnum girgensohnii Russow | T. J. Howell 1802 | 14 Aug 1895 | United States of America | Alaska | — | |||||
| Pinus contorta var. murrayana (Grev. & Balf.) Engelm. | T. J. Howell s.n. | Aug 1880 | United States of America | Oregon | Cascade Mountains | — |
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| Erigeron confinis Howell | T. J. Howell 1507 | Jul 1887 | United States of America | Oregon | Siskiyou Mountains near Waldo | isotype |
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| Plagiobothrys hirtus (Greene) I.M.Johnst. var. hirtus | T. J. Howell s.n. | 25 Jun 1887 | United States of America | Oregon | Umpqua Valley | — |
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| Orthocarpus cuspidatus Greene | T. J. Howell s.n. | 18 Jul 1887 | United States of America | Oregon | Ashland Butte, Siskiyou Mountains | isotype |
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| Penstemon rupicola (Piper) Howell | T. J. Howell s.n. | Jun 1880 | United States of America | Oregon | Cascade Mountains | — |
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| Arabis oregana Rollins | T. J. Howell s.n. | 26 Apr 1887 | United States of America | Oregon | Ashland | isotype |
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| Arabis oregana Rollins | T. J. Howell s.n. | 26 Apr 1887 | United States of America | Oregon | Ashland | isotype |
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| Orthotrichum lyellii Hook. & Taylor | T. J. Howell | Apr. 1886 | United States of America | Oregon | Yaguina Bay | — | ||||
| Orthotrichum lyellii Hook. & Taylor | T. J. Howell 15 | Apr. 1886 | United States of America | Oregon | Yaguina Bay | — | ||||
| Orthotrichum lyellii Hook. & Taylor | T. J. Howell | 09 Mar 1880 | United States of America | Oregon | Columbia Co. | — | ||||
| Orthotrichum lyellii Hook. & Taylor | T. J. Howell | April 1885 | United States of America | Oregon | Sauvie Island | — | ||||
| Orthotrichum lyellii Hook. & Taylor | T. J. Howell | 07 Apr 1886 | United States of America | Oregon | Sauvie's Island | — | ||||
| Racomitrium oreganum Renauld & Cardot | T. J. Howell | Mar 1885 | United States of America | Oregon | Oregon City | isotype |
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| Racomitrium oreganum Renauld & Cardot | T. J. Howell 7 | Mar 1885 | United States of America | Oregon | Oregon City | isotype |
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| Racomitrium oreganum Renauld & Cardot | T. J. Howell 7 | Mar 1885 | United States of America | Oregon | Oregon City | isotype |
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| Sanionia uncinata (Hedw.) Loeske | T. J. Howell 1814 | 17 Jul 1895 | United States of America | Alaska | Yes Bay | — | ||||
| Ancistrocarphus filagineus A.Gray | T. J. Howell s.n. | 25 Apr 1887 | United States of America | Oregon | Jackson Co. On Table Rock | — | ||||
| Lupinus canescens Howell | T. J. Howell s.n. | 14 Jun 1885 | United States of America | Oregon | Buck Creek. | type |
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| Anisothecium schreberianum (Hedw.) Dixon | T. J. Howell | Mar 1880 | United States of America | Oregon | Sauvies Island | — | ||||
| Potentilla ashlandica Greene | T. J. Howell 686 | 08 Jul 1897 | United States of America | Arizona | Siskiyou Mountains, near Ashland Butte. | possible type |
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| Nothochelone nemorosa (Douglas ex Lindl.) Straw | T. J. Howell s.n. | Jul 1880 | United States of America | — | Cascade Mountains | — |
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| Nothochelone nemorosa (Douglas ex Lindl.) Straw | T. J. Howell s.n. | Jul 1880 | United States of America | — | Cascade Mountains | — |
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| Limnorchis laxiflora Rydb. | T. J. Howell s.n. | 08 Jun 1884 | United States of America | Oregon | Coast Mountains | holotype |
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| Orthotrichum consimile Mitt. | T. J. Howell | July 1882 (maybe 1887) | United States of America | Oregon | Tillamook Valley | — | ||||
| Ceratodon purpureus (Hedw.) Brid. | T. J. Howell | Feb 1886 | United States of America | Oregon | Multnomah Co. Sauvie's Island | — |