Displaying 1 - 25 out of 517 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Acalypha rhomboidea Raf. | A. Hayden 9039 | 27 Oct 1939 | United States of America | Iowa | Lee Co. Jackson Twp. Rocky… | — | 3905644 |
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| Acer negundo L. | A. Hayden 872 | 15 May 1936 | United States of America | Iowa | Clay Co. Two miles south… | — | 2485201 |
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| Acer nigrum F.Michx. | A. Hayden 871 | 16 Oct 1936 | United States of America | Iowa | Clay Co. Slopes of wooded… | — | 2486976 |
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| Acer saccharinum L. | A. Hayden 7156 | 15 Oct 1940 | United States of America | Iowa | Clay Co. Lake Twp., Sec.… | — | 2488636 |
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| Acer saccharinum L. | A. Hayden 9754 | 09 Jul 1939 | United States of America | Iowa | Clay Co. Lake twp., Sec.… | — | 2488712 |
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| Acer saccharinum L. | A. Hayden 7157 | 01 Sep 1940 | United States of America | Iowa | Cerro Gordo Co. Clear Lake… | — | 2488737 |
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| Aesculus glabra Willd. | A. Hayden 11348 | 25 Apr 1938 | United States of America | Iowa | Davis Co. Sec. 15. About… | — | 2497483 |
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| Aesculus glabra Willd. | A. Hayden 11347 | 22 Apr 1938 | United States of America | Iowa | Davis Co. Sec. 15. 1… | — | 2497484 |
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| Aesculus glabra Willd. | A. Hayden 7145 | 14 May 1939 | United States of America | Iowa | Madison Co. Lincoln Twp., Sec.… | — | 2497548 |
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| Aesculus glabra Willd. | A. Hayden 9832 | 26 Oct 1939 | United States of America | Iowa | Davis Co. Salt Creek twp.… | — | 2497593 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | A. Hayden 10941 | 26 Jun 1937 | United States of America | Iowa | Davis Co. Lick Creek Twp.,… | — | 1555878 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | A. Hayden 9269 | s.d. | United States of America | Iowa | Davis Co. Lick Creek Twp.,… | — | 1555882 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | A. Hayden 8147 | 19 Jun 1940 | United States of America | Iowa | Clayton Co. Giard Twp. Sec.… | — | 1555883 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | A. Hayden 7064 | 21 Jun 1937 | United States of America | Iowa | Lyon Co. Sioux Twp. Gitche… | — | 1555887 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | A. Hayden 612 | 26 Jun 1936 | United States of America | Iowa | Palo Alto Co. Highland Twp.,… | — | 1555890 |
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| Agrostis perennans (Walter) Tuck. | A. Hayden 8140 | 14 Sep 1940 | United States of America | Iowa | Clay Co. Peterson Twp., Sec.… | — | 1557087 |
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| Agrostis perennans (Walter) Tuck. | A. Hayden 42 | 26 Jul 1934 | United States of America | — | Emmet, Emmet twp. Sec. 18.… | — | 1557089 |
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| Agrostis stolonifera L. | A. Hayden 265 | 19 Jul 1935 | United States of America | Iowa | Clay Co. Outlet Lost Island… | — | 1533170 |
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| Agrostis stolonifera L. | A. Hayden 9287 | 10 Jul 1939 | United States of America | Iowa | Clay Co. Pickerel Run. | — | 1533171 |
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| Alopecurus aequalis Sobol. | A. Hayden 241 | 30 May 1936 | United States of America | Iowa | Clay Co. Lake Twp. Sec.… | — | 1637661 |
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| Alopecurus aequalis Sobol. | A. Hayden 9280 | 14 Jul 1939 | United States of America | Iowa | Clay Co. Lake Twp., Sec.… | — | 1637662 |
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| Alopecurus carolinianus Walter | A. Hayden 7098 | 22 Jun 1937 | United States of America | Iowa | Lyon Co. Sioux Twp. Gitche… | — | 1637929 |
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| Amorpha canescens Pursh | A. Hayden 9911 | 26 Sep 1940 | United States of America | Iowa | Madison Co. Lincoln Twp., about… | — | 2558813 |
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| Amorpha canescens Pursh | A. Hayden 4023 | 12 Jul 1934 | United States of America | Iowa | Palo Alto Co. Highland Twp.,… | — | 2558896 |
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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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