Displaying 1 - 25 out of 452 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Abies concolor (Gordon) Lindl. ex Hildebr. | J. T. Rothrock 786 | 1874 | United States of America | — | — | 29132 |
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| Abronia angustifolia Greene | J. T. Rothrock 340 | 1874 | United States of America | Arizona | — | 3370294 |
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| Acer negundo L. | J. T. Rothrock 20 | 1874 | United States of America | New Mexico | Santa Fe Co. | — | 2485012 |
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| Aegiphila elata Sw. | J. T. Rothrock 158 | 17 Jan 1890 | Cayman Islands | George Town | Grand Cayman. | — | 1337142 |
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| Agave palmeri Engelm. | J. T. Rothrock 496 | 1874 | United States of America | Arizona | — | 3781010 |
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| Ageratina tristis (DC.) R.M.King & H.Rob. | J. T. Rothrock 438 | dec 1890 - mar 1891 | Jamaica | — | British West Indies. | — | 1626511 |
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| Ageratina tristis (DC.) R.M.King & H.Rob. | J. T. Rothrock 466 | 12 Dec 1890 | Jamaica | Portland | Blue Mountains. | — | 1626515 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | J. T. Rothrock s.n. | s.d. | Canada | British Columbia | North British Columbia. | — | 1555500 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | J. T. Rothrock s.n. | 1865-66 | Canada | British Columbia | — | 1555561 |
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| Agrostis perennans (Walter) Tuck. | J. T. Rothrock s.n. | 1865-66 | Canada | British Columbia | Northern British Columbia | — | 1556686 |
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| Allionia choisyi Standl. | J. T. Rothrock 107 | s.d. | United States of America | New Mexico | [Covero?] | — | 4268609 |
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| Allionia incarnata var. villosa (Standl.) B.L.Turner | J. T. Rothrock 324 | 1874 | United States of America | Arizona | Ask Ck. | — | 3371269 |
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| Allium kunthii G.Don | J. T. Rothrock 542 | 1874 | United States of America | Arizona | — | 3763541 |
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| Alnus maritima (Marshall) Muhl. ex Nutt. | J. T. Rothrock 2605s.n. | 19 Aug 1879 | United States of America | Virginia | Eastern Shore of Virginia along… | — | 752459 |
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| Alvaradoa arborescens Griseb. | J. T. Rothrock 527 | 1890 - 1891 | Bahamas | New Providence | New Providence. | — | 01404179 |
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| Ambrosia trifida L. | J. T. Rothrock 695 | 1874 | United States of America | Arizona | Southern Arizona | — | 1884465 |
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| Amorpha fruticosa L. | J. T. Rothrock s.n. | — | United States of America | Arizona | Willow Spring | — | 2559591 |
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| Aphanostephus arizonicus A.Gray | J. T. Rothrock 336 | 1874 | United States of America | Arizona | Gila Valley. | isotype | 158327 |
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| Apiosporina collinsii (Schwein.) Höhn. | J. T. Rothrock s.n. | 1887 | United States of America | Pennsylvania | Along the Juniata | — | 2989823 |
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| Arceuthobium douglasii Engelm. | J. T. Rothrock 69 | Jun 1874 | United States of America | New Mexico | Santa Fe Co. | — | 3705884 |
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| Arceuthobium douglasii Engelm. | J. T. Rothrock 64 | 1874 | United States of America | Arizona | — | 3705886 |
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| Arctostaphylos tomentosa (Pursh) Lindl. | J. T. Rothrock 440 | August | United States of America | Arizona | Mt. Graham, Arizona. | — | 2517628 |
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| Arenaria lanuginosa var. saxosa (A.Gray) Zarucchi, R.L.Hartm. & Rabeler | J. T. Rothrock 3-a | Jul 1874 | United States of America | Arizona | Willow Spring | — | 3160418 |
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| Argythamnia candicans Sw. | J. T. Rothrock 269 | 22 Nov 1890 | Bahamas | San Salvador | Watlings Island. | — | 1384200 |
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| Aristida ternipes var. floridana (Chapm.) Sánchez-Ken & Dávila | J. T. Rothrock 548 | 1890 - 1891 | Bahamas | — | Eleuthera, Eleuthera. | — | 1659661 |
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