Displaying 1 - 25 out of 122 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Abietinella abietina (Hedw.) M.Fleisch. | R. C. Wittmann B-113137 | 19 Oct 2002 | United States of America | Colorado | El Paso Co. Williams Canyon,… | — | ||||
| Amaranthus albus L. | R. C. Wittmann 18223 | 12 Jul 1991 | United States of America | Colorado | Baca Co. Sandy fields S… | — |
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| Amaranthus palmeri S.Watson | R. C. Wittmann 18465 | 08 Sep 1991 | United States of America | Colorado | Prowers Co. 0.5 mi N… | — |
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| Ambrosia acanthicarpa Hook. | R. C. Wittmann 18387 | 06 Sep 1991 | United States of America | Colorado | Las Animas Co. Corner of… | — |
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| Ambrosia grayi (A.Nelson) Shinners | R. C. Wittmann 18450 | 07 Sep 1991 | United States of America | Colorado | Baca Co. Roadside, Road 13,… | — |
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| Antitrichia californica Sull. | R. C. Wittmann B111633 | 28 Feb 2001 | United States of America | Washington | Clallam Co. Sequim, S Sequim… | — | ||||
| Aristida divaricata Humb. & Bonpl. ex Willd. | R. C. Wittmann 18417 | 07 Sep 1991 | United States of America | Colorado | Baca Co. S of Pritchett… | — |
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| Artemisia campestris var. caudata (Michx.) E.J.Palmer & Steyerm. | R. C. Wittmann 18389 | 06 Sep 1991 | United States of America | Colorado | Las Animas Co. Corner of… | — |
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| Artemisia carruthii Alph.Wood ex Carruth. | R. C. Wittmann 18410 | 07 Sep 1991 | United States of America | Colorado | Baca Co. 0.4 mi N… | — |
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| Astragalus wittmannii Barneby | R. C. Wittmann 1573 | 03 May 1981 | United States of America | New Mexico | Colfax Co. Vicinity of the… | — |
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| Astragalus wittmannii Barneby | R. C. Wittmann 1573 | 03 May 1981 | United States of America | New Mexico | Colfax Co. Vicinity of the… | — |
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| Astragalus wittmannii Barneby | R. C. Wittmann 256 | 21 Apr 1979 | United States of America | New Mexico | Mora Co. I-25 mile 395… | — |
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| Atriplex polycarpa (Torr.) S.Watson | R. C. Wittmann 1957 | 01 Nov 1981 - 10 Nov 1981 | United States of America | Nevada | Clark Co. Near a dry… | — |
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| Baccharis wrightii A.Gray | R. C. Wittmann 18165 | 01 Jun 1991 | United States of America | Colorado | Baca Co. Sides and bottom… | — |
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| Bebbia juncea (Benth.) Greene | R. C. Wittmann 1900 | 01 Nov 1981 - 10 Nov 1981 | United States of America | Nevada | Clark Co. Lake Mead Natl.… | — |
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| Bidens bigelovii A.Gray ex Torr. | R. C. Wittmann 18459 | 07 Sep 1991 | United States of America | Colorado | Baca Co. Carrizo Creek, in… | — |
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| Bidens cernua L. | R. C. Wittmann 18451 | 07 Sep 1991 | United States of America | Colorado | Baca Co. Road M, W… | — |
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| Bouteloua eriopoda (Torr.) Torr. | R. C. Wittmann 18419 | 07 Sep 1991 | United States of America | Colorado | Baca Co. S of Pritchett… | — |
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| Brachythecium albicans (Hedw.) Schimp. | R. C. Wittmann B-111610 | 25 Feb 2001 | United States of America | Washington | Clallam Co. Sequim, vicinity of… | — | ||||
| Brachythecium frigidum (Müll.Hal.) Besch. | R. C. Wittmann B-111682 | 26 Mar 2001 | United States of America | Washington | Clallam Co. Along Palo Alto… | — | ||||
| Brachythecium hylotapetum N.L.Higinb. & B.L.Higinb. | R. C. Wittmann B-115628 | 14 Oct 2006 | United States of America | Colorado | Boulder Co. Roosevelt National Forest,… | — | ||||
| Brickellia | R. C. Wittmann 18397 | 07 Sep 1991 | United States of America | Colorado | Baca Co. 4.5 mi E… | — |
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| Brickellia incana A.Gray | R. C. Wittmann 1961 | 01 Nov 1981 - 10 Nov 1981 | United States of America | Nevada | Clark Co. Along Nevada 60… | — |
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| Bromus japonicus Thunb. | R. C. Wittmann 18146 | 31 May 1991 | United States of America | Colorado | Kiowa Co. ca. 11 mi.… | — |
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| Bryum alpinum Huds. ex With. | R. C. Wittmann B-111735 | 29 Apr 2001 | United States of America | Colorado | Boulder Co. Eldorado Springs, S… | — |