Displaying 1 - 25 out of 1600 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Acer circinatum Pursh | T. J. Howell s.n. | May 1880 - Jul 1880 | — | — | — |
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| Acer circinatum Pursh | T. J. Howell 189 | May 1880 - Jul 1880 | — | — | — |
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| Acer macrophyllum Pursh | T. J. Howell 3869 | May 1881 | United States of America | Oregon | Multnomah Co. | — |
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| Achlys triphylla (Sm.) DC. | T. J. Howell s.n. | May 1880 - Jun 1880 | United States of America | — | Pacific Coast | — |
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| Achlys triphylla (Sm.) DC. | T. J. Howell s.n. | May 1880 - Jun 1880 | United States of America | — | Pacific Coast | — |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | T. J. Howell s.n. | Jul 1880 | United States of America | — | Sand banks near the Dalles. | — |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | T. J. Howell s.n. | Jul 1880 | United States of America | — | Sand banks near the Dalles. | — |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | T. J. Howell 103a | 1880 | United States of America | Oregon | Sauvie's Island | — |
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| Adelinia grandis (Douglas ex Lehm.) J.I.Cohen | T. J. Howell s.n. | Apr 1880 | United States of America | — | Pacific Coast | — |
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| Adenostegia viscida Howell | T. J. Howell s.n. | 18 Jul 1887 | United States of America | Oregon | Siskiyou Mountains | isolectotype |
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| Adiantum jordanii C.H.Müll. | T. J. Howell s.n. | 20 Jun 1887 | United States of America | Oregon | Base of cliffs, Umpqua Valley. | — |
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| Adiantum jordanii C.H.Müll. | T. J. Howell s.n. | 20 Jun 1887 | United States of America | Oregon | Base of cliffs, Umpqua Valley. | — |
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| Adiantum jordanii C.H.Müll. | T. J. Howell s.n. | 20 Jun 1887 | United States of America | Oregon | Base of cliffs, Umpqua Valley. | — |
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| Agoseris apargioides var. maritima (E.Sheld.) G.I.Baird | T. J. Howell s.n. | 15 Jul 1882 | United States of America | Oregon | Sandy sea shore, Tillamook. | — |
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| Agoseris aurantiaca (Hook.) Greene var. aurantiaca | T. J. Howell s.n. | 24 Jun 1884 | United States of America | Oregon | Grant's Pass. | — |
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| Agoseris glauca (Pursh) Raf. var. glauca | T. J. Howell s.n. | 07 Jun 1885 | United States of America | Oregon | Harney valley | — |
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| Agoseris glauca (Pursh) Raf. var. glauca | T. J. Howell s.n. | Aug 1881 | United States of America | Washington | Klickitat Co. W.T. | — |
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| Agoseris grandiflora (Nutt.) Greene var. grandiflora | T. J. Howell s.n. | 24 May 1884 | United States of America | Oregon | Grant's Pass. | — |
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| Agoseris grandiflora var. leptophylla G.I.Baird | T. J. Howell s.n. | August 1880 | United States of America | Oregon | Western Oregon. | — |
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| Agoseris grandiflora var. leptophylla G.I.Baird | T. J. Howell s.n. | 18 Jul 1887 | United States of America | Oregon | Ashland Butte, Siskiyon Mountains | — |
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| Agoseris grandiflora var. leptophylla G.I.Baird | T. J. Howell s.n. | July, 1886 | United States of America | Oregon | Near Portland | — |
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| Agoseris grandiflora var. leptophylla G.I.Baird | T. J. Howell s.n. | 1882 | United States of America | Oregon | — |
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| Agoseris heterophylla (Nutt.) Greene var. heterophylla | T. J. Howell s.n. | Jun 1880 | — | — | Pacific Coast | — |
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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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| Agrostis canina L. | T. J. Howell 495 | Jun 1877 | United States of America | Oregon | Multnomah Co. | — |
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