Displaying 1 - 25 out of 517 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Juniperus virginiana L. var. virginiana | A. Hayden 3099 | 21 Sep 1942 | United States of America | Iowa | O'Brien Co. Waterman Township, Sec.… | — | 18575 |
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| Juniperus virginiana L. var. virginiana | A. Hayden 840 | 17 Sep 1936 | United States of America | Iowa | Palo Alto Co. Walnut Township.,… | — | 18576 |
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| Juniperus virginiana L. var. virginiana | A. Hayden 3093 | 29 Apr 1942 | United States of America | Iowa | O'Brien Co. Waterman Township, Sect.… | — | 18577 |
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| Juniperus virginiana L. var. virginiana | A. Hayden 3097 | 21 Sep 1942 | United States of America | Iowa | O'Brien Co. Waterman Township, Sect.… | — | 18578 |
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| Penstemon pallidus Small | A. Hayden 9533 | 13 May 1939 | United States of America | Iowa | Davis Co. Lick Creek Township,… | — | 628702 |
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| Penstemon pallidus Small | A. Hayden 9535 | 27 Oct 1939 | United States of America | Iowa | Wapello Co. Keokuk Township; above… | — | 628703 |
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| Rhytidiadelphus triquetrus (Hedw.) Warnst. | A. Hayden 1100 | 08 Apr 1937 | United States of America | Iowa | Boone Co. Worth Twp., above… | — | 292839 | ||
| Carduus nutans L. | A. Hayden 10848 | 08 Jul 1937 | United States of America | Iowa | Hamilton Co. Ellsworth Twp., Sec.… | — | 532288 |
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| Lithospermum occidentale (Mack.) Weakley, Witsell & D.Estes | A. Hayden 9004 | 22 Jun 1936 | United States of America | Iowa | Palo Alto Co. Highand Township,… | — | 21556 |
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| Taxus canadensis Marshall | A. Hayden 5086 | 20 Apr 1937 | United States of America | Iowa | Delaware Co. Richland Twp., Sect.… | — | 312738 |
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| Centaurea maculosa Lam. | A. Hayden 10796 | 13 Aug 1934 | United States of America | Iowa | Emmet Co. Twelve-Mile-Lake Twp., Sec.… | — | 581183 |
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| Carex blanda Dewey | A. Hayden 10907 | 28 Jun 1938 | United States of America | Iowa | Davis Co. Lick Creek Township,… | — | 25614 |
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| Drepanocladus polycarpon (Blandow ex Voit) Warnst. | A. Hayden 9711 | 18 May 1937 | United States of America | Iowa | Clay Co. Freeman Twp.: Margin… | — | 576391 | ||
| Tomanthera auriculata (Michx.) Raf. | A. Hayden 7526 | 16 Aug 1942 | United States of America | Iowa | Clay Co. Lake Township: On… | — | 28994 |
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| Tomanthera auriculata (Michx.) Raf. | A. Hayden 7525 | 27 Aug 1942 | United States of America | Iowa | Clay Co. Lake Township: on… | — | 29000 |
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| Penstemon gracilis Nutt. subsp. gracilis | A. Hayden 9032 | 22 Jun 1937 | United States of America | Iowa | Lyon Co. Gitche Manito State… | — | 600810 |
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| Convolvulus arvensis L. | A. Hayden 3012 | 19 Aug 1936 | United States of America | Iowa | Palo Alto Co. Highland Twp.,… | — | 642929 |
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| Tribulus terrestris L. | A. Hayden 9106 | 10 Sep 1938 | United States of America | Iowa | Story Co. Washington Twp., Sec.… | — | 643476 |
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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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| Bromus tectorum L. | A. Hayden 104 | 18 Jun 1935 | United States of America | Iowa | Palo Alto Co. Highland Twp.,… | — | 664491 |
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| Bromus tectorum L. | A. Hayden 102 | 25 Jun 1935 | United States of America | Iowa | Clay Co. Sioux Twp., Sec.… | — | 664492 |
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| Carduus acanthoides L. | A. Hayden 10849 | 23 Jul 1938 | United States of America | Iowa | Plymouth Co. Washington Twp., Sec.… | — | 532241 |
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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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| Leskea gracilescens Hedw. | A. Hayden 9722 | 14 Aug 1940 | United States of America | Iowa | Palo Alto Co. Section 21 | — | 488811 | ||
| Penstemon grandiflorus Nutt. | A. Hayden 11438 | 09 Jun 1938 | United States of America | Iowa | Cherokee Co. About 9 miles… | — | 601071 |
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