Displaying 151 - 175 out of 1600 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Dicranum scoparium Hedw. | T. J. Howell 1825 | Jul 1895 | United States of America | Alaska | Yes Bay | — | ||||
| Dicranum scoparium Hedw. | T. J. Howell | Jun 1884 | United States of America | Oregon | Waldo | — | ||||
| Taeniopleurum howellii J.M.Coult. & Rose | T. J. Howell s.n. | 13 Jul 1887 | United States of America | Oregon | Grant's Pass | isotype |
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| Taeniopleurum howellii J.M.Coult. & Rose | T. J. Howell s.n. | 13 Jul 1887 | United States of America | Oregon | Grant's Pass | syntype |
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| Penstemon richardsonii Douglas ex Lindl. var. richardsonii | T. J. Howell s.n. | Aug 1882 | United States of America | Oregon | Hood River | — |
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| Bartramia pomiformis Hedw. | T. J. Howell 1828 | 08 Aug 1895 | United States of America | Alaska | Short Bay | — | ||||
| Hieracium oregonicum Zahn | T. J. Howell s.n. | 19 Jul 1887 | United States of America | Oregon | Ashland Butte, Siskiyou Mountains | type |
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| Hieracium oregonicum Zahn | T. J. Howell s.n. | 19 Jul 1887 | United States of America | Oregon | Ashland Butte, Siskiyou Mountains | type |
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| Hedwigia stellata Hedenäs | T. J. Howell | 1880 | United States of America | Oregon | Multnomah Co. Rooster Rock State… | — | ||||
| Penstemon barrettiae A.Gray | T. J. Howell s.n. | — | United States of America | Oregon | Eastern Oregon | — |
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| Penstemon barrettiae A.Gray | T. J. Howell s.n. | — | United States of America | Oregon | Eastern Oregon | — |
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| Peucedanum microcarpum Howell | T. J. Howell s.n. | 20 Apr 1887 | United States of America | Oregon | Roseburg, Umpqua Valley | isotype |
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| Peucedanum microcarpum Howell | T. J. Howell s.n. | 20 Apr 1887 | United States of America | Oregon | Roseburg, Umpqua Valley | isotype |
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| Trillium rivale S.Watson | T. J. Howell s.n. | 08 Jun 1884 | United States of America | Oregon | Near Waldo. | syntype |
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| Trillium rivale S.Watson | T. J. Howell s.n. | 08 Jun 1884 | United States of America | Oregon | Near Waldo. | syntype |
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| Salix laevigata Bebb | T. J. Howell 1393 | Apr 1889 | United States of America | Oregon | Hornbrook Call. | — |
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| Agoseris tomentosa Howell | T. J. Howell s.n. | 01 Jun 1885 | United States of America | Oregon | Base of Stein's Mountain | isotype |
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| Philonotis fontana (Hedw.) Brid. | T. J. Howell | Aug 1882 | United States of America | Oregon | Adams Mt. | — | ||||
| Philonotis fontana (Hedw.) Brid. | T. J. Howell | Aug 1882 | United States of America | Washington | Yakima Co. Mt. Adams | — | ||||
| Peucedanum canbyi J.M.Coult. & Rose | T. J. Howell s.n. | Apr 1880 | United States of America | Oregon | Eastern Oregon | syntype |
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| Peucedanum canbyi J.M.Coult. & Rose | T. J. Howell 1369 | 1888 | United States of America | Washington | Klickitat Co. | possible syntype |
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| Peucedanum canbyi J.M.Coult. & Rose | T. J. Howell s.n. | Apr 1880 | United States of America | Oregon | Eastern Oregon | possible syntype |
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| Taxus brevifolia Nutt. | T. J. Howell s.n. | Mar 1892 | United States of America | Oregon | Sauvie's Island | — |
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| Ranunculus occidentalis var. howellii Greene | T. J. Howell 1331 | 15 Apr 1889 | United States of America | Oregon | Near Ashland | isotype |
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| Cardamine orbicularis Greene | T. J. Howell 3929 | May 1887 | United States of America | Oregon | Mouth of the Columbia River | isotype |
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