Displaying 1 - 25 out of 102 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Arctostaphylos pungens Kunth | J. Howell s.n. | June 1879 | United States of America | Oregon | Cascade Mts., eastern slope. | — | 2517439 |
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| Arctostaphylos viscida Parry | J. Howell s.n. | June 1884 | United States of America | Oregon | Josephine Co. Waldo. | — | 2520633 |
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| Arenaria aculeata S.Watson | J. Howell s.n. | 02 Jun 1885 | United States of America | Oregon | Stein's Mountain | — | 52734 |
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| Arenaria pusilla S.Watson | J. Howell s.n. | — | United States of America | Oregon | probable type | 342416 |
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| Arnica chamissonis Less. | J. Howell s.n. | 1879 | — | — | [No locality data on label;… | — | 1870802 |
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| Astragalus accidens S.Watson | J. Howell s.n. | 1884 | United States of America | Oregon | Oregon Flora | — | 01203482 |
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| Astragalus howellii A.Gray | J. Howell s.n. | 1879 | United States of America | Oregon | Wasco Co. High prairies. | isotype | 5459 |
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| Atrichum undulatum (Hedw.) P.Beauv. | J. Howell | 1879 | United States of America | Oregon | Near Portland | — | 388941 | ||
| Aulacomnium androgynum (Hedw.) Schwägr. | J. Howell | 1879 | United States of America | Oregon | Near Portland | — | 383714 | ||
| Bolandra oregana S.Watson | J. Howell s.n. | Jun 1877 | United States of America | Oregon | Milwaukie | isotype | 185969 |
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| Brachythecium velutinum (Hedw.) Schimp. | J. Howell 1b | 1875 | United States of America | Oregon | Multnomah Co. | — | 761077 | ||
| Buckiella undulata (Hedw.) Ireland | J. Howell | Jan 1876 | United States of America | Oregon | Multnomah Co. | — | 507180 | ||
| Chara coronata Ziz | J. Howell | T. J. Howell 2 | 10 Sep 1885 | United States of America | Oregon | — | 02017376 |
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| Chara coronata Ziz | J. Howell | T. J. Howell s.n. | s.d. | United States of America | Oregon | — | 02017380 |
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| Chara coronata Ziz | J. Howell | T. J. Howell s.n. | s.d. | United States of America | Oregon | — | 02195772 | |||
| Claopodium crispifolium (Hook.) Renauld & Cardot | J. Howell | 1876 | United States of America | Oregon | Multnomah Co. | — | 531078 | ||
| Claopodium crispifolium (Hook.) Renauld & Cardot | J. Howell | Spring of 1899 | United States of America | Oregon | Near Portland | — | 531081 | ||
| Cryptogramma acrostichoides R.Br. | J. Howell s.n. | Sep 1879 | United States of America | Oregon | Columbia River | — | 3484753 |
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| Cryptogramma acrostichoides R.Br. | J. Howell s.n. | Aug 1879 | United States of America | Oregon | Columbia River | — | 3484760 |
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| Cryptogramma acrostichoides R.Br. | J. Howell s.n. | Jun 1877 | United States of America | Oregon | Rooster Rock | — | 3484749 |
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| Cystopteris fragilis (L.) Bernh. | J. Howell s.n. | 1878 | United States of America | Oregon | near Willamette Slough | — | 3799708 |
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| Cystopteris fragilis (L.) Bernh. | J. Howell s.n. | 1878 | United States of America | Oregon | near Willamette Slough | — | 3799720 |
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| Cystopteris fragilis (L.) Bernh. | J. Howell s.n. | s.d. | Canada | — | Makaska Island, Malaska | — | 3800115 |
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| Dryopteris arguta (Kaulf.) Watt | J. Howell s.n. | Aug 1879 | United States of America | Oregon | near Williamette Slough | — | 3540529 |
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| Erigeron linearis (Hook.) Piper | J. Howell s.n. | Jun 1879 | United States of America | Oregon | Wasco Co. | — | 02681400 |
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