Displaying 1 - 25 out of 517 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Pithophora oedogonia (Mont.) Wittr. | A. Hayden s.n. | 10 Oct 1909 | United States of America | Missouri | Saint Louis Co. Tower Grove… | — | 02134019 |
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| Pithophora oedogonia (Mont.) Wittr. | A. Hayden s.n. | 10 Oct 1909 | United States of America | Missouri | Saint Louis Co. Tower Grove… | — | 02134020 |
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| Pithophora oedogonia (Mont.) Wittr. | A. Hayden s.n. | 10 Oct 1909 | United States of America | Missouri | Saint Louis Co. Tower Grove… | — | 02349308 |
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| Anthyllis vulneraria L. | A. Hayden s.n. | Jul 1925 | United States of America | Iowa | Wright Co. Clarion | — | 1043271 |
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| Carduus acanthoides L. | A. Hayden s.n. | 14 Jul 1926 | United States of America | Iowa | Council Bluffs | — | 532251 |
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| Dalea enneandra Nutt. | A. Hayden s.n. | 14 Jul 1926 | United States of America | Iowa | Council Bluffs | — | 01259266 |
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| Chamaecrista fasciculata (Michx.) Greene | A. Hayden s.n. | 24 Jul 1926 | United States of America | Iowa | Mount Ayr | — | 01453775 |
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| Cirsium canescens Nutt. | A. Hayden s.n. | 02 Aug 1926 | United States of America | Iowa | Buena Vista Co. | — | 02042394 |
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| Symphyotrichum falcatum (Lindl.) G.L.Nesom | A. Hayden s.n. | Sep 1926 | United States of America | South Dakota | Near Belle Fourche | — | 1847922 |
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| Artemisia frigida Willd. | A. Hayden s.n. | Sep 1926 | United States of America | South Dakota | Near Belle Fourche | — | 1894295 |
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| Carex prairea Dewey ex Alph.Wood | A. Hayden 783 | 15 May 1930 | United States of America | Iowa | Palo Alto Co. Highland Twp.… | — | 2297925 |
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| Solidago canadensis var. gilvocanescens Rydb. | A. Hayden 10683 | 21 Aug 1931 | United States of America | Iowa | Hamilton Co. Cass Twp.; along… | — | 2338508 |
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| Poa annua L. | A. Hayden 11299 | 07 Jun 1932 | United States of America | Iowa | Story Co. Washington Twp., Sec.4.… | — | 1784112 |
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| Rosa rudiuscula Greene | A. Hayden 11571 | 16 Jun 1932 | United States of America | Iowa | Story Co. Nevada Twp., Sec.… | — | 2862737 |
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| Symphyotrichum sericeum (Vent.) G.L.Nesom | A. Hayden 11201 | 13 Sep 1932 | United States of America | Iowa | Fayette Co. Five mi. S… | — | 1868953 |
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| Salix x fragilis L. | A. Hayden 1044 | 09 Apr 1933 | United States of America | Iowa | Palo Alto Co. Highland Twp.… | — | 2416143 |
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| Tribulus terrestris L. | A. Hayden 865 | 04 Jul 1933 | United States of America | Iowa | Sioux Co. Logan Twp., Sec.… | — | 643534 |
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| Verbena stricta Vent. | A. Hayden 3001 | 06 Jul 1933 | United States of America | Iowa | Dickinson Co. One mile w.… | — | 3555904 |
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| Amorpha fruticosa L. | A. Hayden 4052 | 27 Jul 1933 | United States of America | Iowa | Clay Co. Freeman Twp., Spring… | — | 2559198 |
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| Cirsium discolor (Muhl. ex Willd.) Spreng. | A. Hayden 454 | 07 Aug 1933 | United States of America | Iowa | Story Co. Washington Twp., Sec.… | — | 2042659 |
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| Chamaecrista fasciculata (Michx.) Greene | A. Hayden 430 | 15 Aug 1933 | United States of America | Iowa | Story Co. Palestine Twp. C… | — | 01453767 |
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| Amphicarpaea bracteata (L.) Fernald | A. Hayden 400 | 31 Aug 1933 | United States of America | Iowa | Winneshiek Co. 2 miles north… | — | 2560149 |
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| Apios americana Medik. | A. Hayden 387 | 31 Aug 1933 | United States of America | Iowa | Winneshiek Co. | — | 2560379 |
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| Solidago ulmifolia Muhl. & Cronquist var. ulmifolia | A. Hayden 409 | 29 Sep 1933 | United States of America | Iowa | Hamilton Co. Cass Twp. 2… | — | 2373791 |
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| Carex sartwelliana Olney | A. Hayden 180 | 04 Apr 1934 | United States of America | Iowa | Palo Alto Co. Lost Island… | — | 2301819 |
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