Displaying 1 - 25 out of 2091 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Abies balsamea (L.) Mill. | R. T. Clausen 6506 | 08 Apr 1945 | United States of America | New York | Tompkins Co. Fir Tree Swamp,… | — |
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| Abies balsamea (L.) Mill. | R. T. Clausen 5673 | 04 Oct 1941 | United States of America | Pennsylvania | Potter Co. Susquehanna River drainage.… | — |
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| Abies concolor (Gordon) Lindl. ex Hildebr. | R. T. Clausen 8047 | 25 Feb 1951 | United States of America | New York | Tompkins Co. Slope below University… | — |
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| Abies concolor (Gordon) Lindl. ex Hildebr. | R. T. Clausen 5232 | 30 Aug 1940 | United States of America | Arizona | Cochise Co. Gila River Basin.… | — |
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| Abies fraseri (Pursh) Poir. | R. T. Clausen 3690 | 21 Sep 1938 | United States of America | North Carolina | McDowell Co. Slope of Mt.… | — |
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| Abies fraseri (Pursh) Poir. | R. T. Clausen 5583 | 04 Sep 1941 | United States of America | North Carolina | Avery Co. Near summit of… | — |
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| Abronia umbellata Lam. | R. T. Clausen 4933 | 24 Jul 1940 | United States of America | California | Del Norte Co. Smith River… | — |
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| Abutilon californicum Benth. | R. T. Clausen 5331 | 12 Sep 1940 | United States of America | Texas | Cameron Co. Northeast of Brownsville | — |
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| Acacia constricta Benth. | R. T. Clausen 7814 | 19 Jun 1949 | United States of America | New Mexico | Lincoln Co. 4.8 km. east… | — |
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| Acalypha rhomboidea Raf. | R. T. Clausen 4458 | 08 Aug 1939 | United States of America | New York | Oswego Co. Lake and Jefferson… | — |
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| Acer glabrum Torr. | R. T. Clausen 4959 | 26 Jul 1940 | United States of America | California | Siskiyou Co. | — |
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| Acer leucoderme Small | R. T. Clausen 5717 | 31 Mar 1942 | United States of America | Alabama | Bibb Co. Pratt Ferry | — |
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| Acer negundo L. | R. T. Clausen 5633 | 10 Sep 1941 | United States of America | South Carolina | Pickens Co. open woods 1/2… | — |
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| Acer negundo var. californicum (Torr. & A.Gray) Wesm. | R. T. Clausen 5253 | 02 Sep 1940 | United States of America | New Mexico | Sierra Co. about 2 miles… | — |
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| Acer pensylvanicum L. | R. T. Clausen 5608 | 07 Sep 1941 | United States of America | North Carolina | Avery Co. rocky woods on… | — |
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| Acer rubrum L. | R. T. Clausen 8405 | 24 Jul 1954 | United States of America | New York | Saratoga Co. Tree 11, along… | — |
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| Acer saccharum Marshall | R. T. Clausen 8344 | 12 Jun 1953 | United States of America | New York | Tompkins Co. SW of 1421… | — |
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| Acer spicatum Lam. | R. T. Clausen 3868 | 27 May 1939 | United States of America | New York | Tioga Co. in ravine 1… | — |
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| Achillea millefolium L. | R. T. Clausen 8391 | 01 Jul 1954 | United States of America | Pennsylvania | Pike Co. Glaciated Allegheny Plateau.… | — |
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| Achillea millefolium L. | R. T. Clausen 5249 | 02 Sep 1940 | United States of America | New Mexico | Sierra Co. along trail to… | — |
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| Achillea millefolium L. | R. T. Clausen 5892 | 08 Aug 1942 | United States of America | New York | Tompkins Co. flats at southwest… | — |
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| Achillea millefolium L. | R. T. Clausen 6336 | 01 Jul 1944 | United States of America | New York | Tompkins Co. roadside behind campus… | — |
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| Aconogonon davisiae (W.H.Brewer ex A.Gray) Soják | R. T. Clausen 5005 | 30 Jul 1940 | United States of America | Oregon | Klamath Co. Pacific Slope; Middle… | — |
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| Adiantum andicola Liebm. | R. T. Clausen 7475 | 18 Mar 1949 | Mexico | Puebla | Huauchinango Mun. south slope of… | — |
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| Adiantum capillus-veneris L. | R. T. Clausen 5131 | 21 Aug 1940 | United States of America | Nevada | Clark Co. In crevices at… | — |
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