Displaying 1 - 75 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 | Spring of 1899 | United States of America | Oregon | Near Portland | — | 531081 | ||
| Claopodium crispifolium (Hook.) Renauld & Cardot | J. Howell | 1876 | United States of America | Oregon | Multnomah Co. | — | 531078 | ||
| 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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| Erigeron peregrinus (Banks ex Pursh) Greene | J. Howell | Jul 1880 | United States of America | Oregon | Hood River Co. Mt. Hood;… | — | 2092144 |
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| Erythronium giganteum Lindl. | J. Howell | s.d. | United States of America | Oregon | — | 3533726 |
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| Fissidens limbatus Sull. | J. Howell 38 | Jan 1876 | United States of America | Oregon | Multnomah Co. | — | 314487 | ||
| Fontinalis neomexicana Sull. & Lesq. | J. Howell | 1882 | United States of America | Oregon | Creek at the base of… | — | 491292 | ||
| Fontinalis neomexicana Sull. & Lesq. | J. Howell | Oct 1882 | United States of America | Oregon | Base of Mt. Hood | — | 491418 | ||
| Homalothecium nuttallii (Wilson) A.Jaeger | J. Howell s.n. | 1876 | United States of America | Oregon | Multnomah Co. | — | 03105023 | ||
| Howellia aquatilis A.Gray | J. Howell s.n. | Apr 1880 | United States of America | Oregon | Sauvie's Island | — | 30845 |
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| Howellia aquatilis A.Gray | J. Howell s.n. | 1879 | United States of America | Oregon | Sauvies Island | probable isotype | 546999 |
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| Howellia aquatilis A.Gray | J. Howell s.n. | 1879 | United States of America | Oregon | probable isotype | 547002 |
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| Howellia aquatilis A.Gray | J. Howell s.n. | 1879 | United States of America | Oregon | probable isotype | 547003 |
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| Howellia aquatilis A.Gray | J. Howell s.n. | 1879 | United States of America | Oregon | probable isotype | 547001 |
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| Hylocomium splendens (Hedw.) Schimp. | J. Howell | 1879 | United States of America | Oregon | Multnomah Co. Near Portland | — | 288871 | ||
| Hypnum circinale Hook. | J. Howell | 1879 | United States of America | Oregon | Near Portland | — | 610687 | ||
| Isoetes howellii Engelm. | J. Howell s.n. | Immature plant 1 Jun; mature plant 1 Aug 1880 | United States of America | Oregon | Muddy borders of ponds near… | isotype | 76807 |
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| Isoetes howellii Engelm. | J. Howell s.n. | Immature plant 1 Jun; mature plant 1 Aug 1880 | United States of America | Oregon | Muddy borders of ponds near… | isotype | 76832 |
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| Isoetes howellii Engelm. | J. Howell s.n. | 19 May 1889 | United States of America | Oregon | Dalles | — | 3507990 |
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| Isothecium cristatum (Hampe) H.Rob. | J. Howell | — | United States of America | Oregon | Multnomah Co. | — | 693075 | ||
| Isothecium stoloniferum Brid. | J. Howell | 1876 | United States of America | Oregon | Multnomah Co. | — | 707021 | ||
| Kindbergia praelonga var. stokesii (Turner) Ochyra | J. Howell | Jan 1876 | United States of America | Oregon | Multnomah Co. | — | 734261 | ||
| Leucolepis acanthoneura (Schwägr.) Lindb. | J. Howell | Spring of 1879 | United States of America | Oregon | Near Portland | — | 369714 | ||
| Lomatium triternatum var. macrocarpum (J.M.Coult. & Rose) Mathias | J. Howell s.n. | s.d. | United States of America | Oregon | — | 1043355 |
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| Lupinus lepidus var. aridus (Douglas ex Lindl.) Jeps. | J. Howell 315 | July 1880 | United States of America | Oregon | Near the Dalles. | — | 2598556 |
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| Lupinus lepidus var. aridus (Douglas ex Lindl.) Jeps. | J. Howell 316 | July 1880 | United States of America | Oregon | — | 2598561 |
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| Lupinus lepidus var. lobbii (S.Watson) C.L.Hitchc. | J. Howell 12 | July 1880 | United States of America | Oregon | Mt. Hood. | — | 2598778 |
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| Lupinus rivularis Douglas ex Lindl. | J. Howell s.n. | — | United States of America | Oregon | — | 2601154 |
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| Metaneckera menziesii (Drumm.) Steere | J. Howell | 01 Jan 1879 | United States of America | Oregon | Multnomah Co. Near Portland | — | 465789 | ||
| Metaneckera menziesii (Drumm.) Steere | J. Howell | 1876 | United States of America | Oregon | Multnomah Co. | — | 465788 | ||
| Montia howellii S.Watson | J. Howell s.n. | 12 Apr 1884 | United States of America | Oregon | Sauvie's Island | isotype | 342242 |
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| Montia howellii S.Watson | J. Howell s.n. | 12 Apr 1884 | United States of America | Oregon | Sauvie's Island | isotype | 342243 |
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| Montia howellii S.Watson | J. Howell s.n. | 12 Apr 1884 | United States of America | Oregon | Sauvie's Island | isotype | 342244 |
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| Myriopteris gracillima D.C. Eaton | J. Howell s.n. | Jun 1879 | United States of America | Washington | Cimcoe Mts. Washington Territory. | — | 3494090 |
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| Neckera douglasii Hook. | J. Howell | 1879 | United States of America | Oregon | Multnomah Co. Near Portland | — | 466044 | ||
| Neckera douglasii Hook. | J. Howell | Jan 1876 | United States of America | Oregon | Multnomah Co. | — | 466021 | ||
| Nitella californica f. nidifica Allen | J. Howell | T. J. Howell 6 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02286028 | ||
| Nitella californica f. nidifica Allen | J. Howell | T. J. Howell 6 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02020781 |
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| Nitella californica f. nidifica Allen | J. Howell | T. J. Howell 6 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02020780 |
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| Nitella californica f. nidifica Allen | J. Howell | T. J. Howell 6 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02020783 |
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| Nitella californica f. nidifica Allen | J. Howell | T. J. Howell 6 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02020766 |
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| Nitella clavata Kütz. | J. Howell | T. J. Howell 3 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02020926 |
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| Nitella clavata Kütz. | J. Howell | T. J. Howell 5 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02020941 |
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| Nitella clavata Kütz. | J. Howell | T. J. Howell 5 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02020924 |
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| Nitella mucronata (A.Braun) Miq. | J. Howell | T. J. Howell 4 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02022301 |
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| Nitella mucronata (A.Braun) Miq. | J. Howell | T. J. Howell 4 | 10 Sep 1882 | United States of America | Oregon | Sauvie's Island | — | 02022320 |
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| Pentagramma triangularis (Kaulf.) Yatsk., Windham & E.Wollenw. subsp. triangularis | J. Howell s.n. | May 1879 | United States of America | Oregon | Near Willameth Slough | — | 3501874 |
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| Pinus attenuata Lemmon | J. Howell s.n. | 06 Jun 1884 | United States of America | Oregon | Waldo | — | 34646 |
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| Pinus attenuata Lemmon | J. Howell s.n. | 05 Jun 1884 | United States of America | Oregon | Tops of high hills near… | — | 34607 |
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| Pinus attenuata Lemmon | J. Howell s.n. | 05 Jun 1884 | United States of America | Oregon | Tops of high hills near… | — | 34614 | ||
| Polypodium amorphum Suksd. | J. Howell s.n. | Aug 1879 | United States of America | Oregon | near the Cascades of the… | — | 03792234 |
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| Polypodium californicum Kaulf. | J. Howell s.n. | Mar 1879 | United States of America | Wyoming | Fisher's Landing | — | 3792420 |
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| Polypodium glycyrrhiza D.C. Eaton | J. Howell s.n. | Dec 1875 | United States of America | Oregon | Sauvies Island | — | 3792525 |
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