Displaying 1 - 25 out of 144 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Acer spicatum Lam. | F. K. Butters 478 | 20 Jul 1932 | United States of America | Minnesota | 5 mi. N. of Grand… | — | 2490397 |
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| Acer spicatum Lam. | F. K. Butters s.n. | 31 May 1920 | United States of America | Minnesota | Wabasha Co. Bluffs of Mississippi,… | — | 2490398 |
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| Adiantum aleuticum (Rupr.) C.A.Paris | F. K. Butters a33474 | Aug 1906 - 08 Aug 1909 | Canada | British Columbia | Moraine of Dawson Glacier. Selkirk… | — | 3482857 |
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| Adiantum pedatum L. | F. K. Butters 487 | s.d. | Canada | British Columbia | Glacier | — | 3483775 |
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| Agrostis canina L. | F. K. Butters 689691 | 22 Jul 1911 | Canada | British Columbia | North M[orrain, Sir] Sandford El. | — | 1554528 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | F. K. Butters 37 | 07 Jul 1938 | United States of America | Minnesota | Cook Co. On top of… | — | 1555915 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | F. K. Butters 55 | 07 Jul 1938 | United States of America | Minnesota | Cook Co. Along base of… | — | 1555918 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | F. K. Butters 465 | 17 Jul 1932 | United States of America | Minnesota | Cook Co. S. of Clearwater… | — | 1556185 |
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| Alnus incana subsp. rugosa (Du Roi) R.T.Clausen | F. K. Butters 324a | 07 Jul 1937 | Canada | Ontario | Thunder Bay Distr. Island in… | — | 2471723 |
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| Alnus viridis subsp. crispa (Aiton) Turrill | F. K. Butters 665 | 01 Jul 1940 | United States of America | Minnesota | Cook Co. Steep slope at… | — | 2473116 |
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| Alnus viridis subsp. crispa (Aiton) Turrill | F. K. Butters 4486 | 30 Jun 1924 | United States of America | Minnesota | Near mouth of Carribean River… | — | 2473165 |
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| Alnus viridis subsp. crispa (Aiton) Turrill | F. K. Butters s.n. | 09 Sep 1918 | United States of America | Minnesota | Saint Louis Co. Rocky island,… | — | 2473166 |
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| Alnus viridis subsp. sinuata (Regel) Á.Löve & D.Löve | F. K. Butters 428 | 26 Jul 1908 | Canada | British Columbia | Selkirk Mountains. | — | 2475040 |
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| Antennaria howellii subsp. canadensis (Greene) R.J.Bayer | F. K. Butters 69 | June 20, 1936 | United States of America | Minnesota | Cook Co. Clearwater Lake. | — | 1890091 |
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| Antennaria howellii subsp. neodioica (Greene) R.J.Bayer | F. K. Butters 10811 | July 1, 1939 | United States of America | Minnesota | Cook Co. On North side… | — | 1890272 |
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| Antennaria howellii subsp. neodioica (Greene) R.J.Bayer | F. K. Butters 39 | July 7, 1938 | United States of America | Minnesota | Cook Co. Top of the… | — | 1890279 |
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| Arnica latifolia Bong. | F. K. Butters 233 | 27 Jul 1907 | Canada | British Columbia | Selkirk Mountains; Grizzly Creek, Prairie… | — | 1881909 |
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| Asplenium montanum Willd. | F. K. Butters 2030 | 24 Jan 1940 | United States of America | Connecticut | High Rock State Park | — | 3519120 |
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| Asplenium trichomanes L. | F. K. Butters 136 | 13 Jul 1938 | United States of America | Minnesota | Cook Co. East-facing cliff overlooking… | — | 3523069 |
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| Astragalus alpinus L. var. alpinus | F. K. Butters 1322 | 12 Jun 1906 | Canada | Alberta | Old road, Banff | — | 01215287 |
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| Astragalus australis (L.) Lam. | F. K. Butters 15 | 04 Jul 1907 | Canada | Alberta | Banff | — | 01244478 |
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| Astragalus miser var. serotinus (A.Gray ex Cooper) Barneby | F. K. Butters 12 | 04 Jul 1907 | Canada | Alberta | Banff | — | 01261862 |
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| Astragalus robbinsii var. minor (Hook.) Barneby | F. K. Butters 1384 | 11 Jun 1906 | Canada | Alberta | Banff. Candian Rocky Mountains | — | 01282386 |
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| Athyrium filix-femina subsp. angustum R.T.Clausen | F. K. Butters 3982 | 20 Jul 1920 | United States of America | Minnesota | Houston Co. Mayville Twp. | — | 3797551 |
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| Athyrium filix-femina subsp. angustum R.T.Clausen | F. K. Butters 448 | 16 Jul 1932 | United States of America | Minnesota | Cook Co. North of Clearwater… | — | 3797567 |
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