Displaying 1 - 50 out of 233 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Mimulus jamesii Torr. & A.Gray | C. A. Geyer 119 | 1839 | United States of America | North Dakota | Fresh water springs. Devil's Lake. | type | 90727 |
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| Euphorbia geyeri Engelm. & A.Gray | C. A. Geyer s.n. | Aug 1842 | United States of America | Illinois | Cass Co. | isotype | 263117 |
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| Euphorbia geyeri Engelm. & A.Gray | C. A. Geyer s.n. | Aug 1842 | United States of America | Illinois | Cass Co. | isotype | 263118 |
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| Penstemon confertus Douglas ex Lindl. | C. A. Geyer 464 | 1845 | United States of America | — | Rocky Mountains | — | 584834 |
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| Marsilea mucronata A.Braun | C. A. Geyer 71 | Jul | United States of America | North Dakota | not far from Devil's Lake. | probable isotype | 149806 |
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| Marsilea mucronata A.Braun | C. A. Geyer s.n. | 1839 | United States of America | — | Swamps in the prairies, near… | isotype | 149807 |
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| Marsilea mucronata A.Braun | C. A. Geyer 71 | Jul | United States of America | North Dakota | not far from Devil's Lake. | isotype | 149808 |
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| Marsilea mucronata A.Braun | C. A. Geyer s.n. | 1839 | United States of America | North Dakota | Devil's Lake | isotype | 149810 |
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| Marsilea mucronata A.Braun | C. A. Geyer s.n. | 1839 | United States of America | North Dakota | Devil's Lake | probable isotype | 149811 |
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| Carex geyeri Boott | C. A. Geyer 332 | — | United States of America | — | Rocky Mountains | isotype | 11120 |
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| Myosotis scouleri Hook. & Arn. | C. A. Geyer s.n. | 1839 | United States of America | — | — | 335593 |
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| Solidago speciosa var. rigidiuscula Torr. & A.Gray | C. A. Geyer 31 | 14 Sep 1839 | United States of America | — | Mississipi portion of the prairie… | syntype | 259960 |
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| Suaeda depressa (Pursh) S.Watson | C. A. Geyer 287 | — | United States of America | North Dakota | Between James River and Devil's… | — | 324377 |
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| Chrysopsis villosa var. minor Hook. | C. A. Geyer 7 | — | United States of America | Oregon | Granitic masses of Sweetwater River,… | isotype | 163164 |
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| Atheropogon papillosus Engelm. | C. A. Geyer s.n. | Aug 1842 | United States of America | Illinois | Cass Co. Beardstown | type | 346072 |
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| Erigeron pumilus Nutt. | C. A. Geyer s.n. | 26 Jun 1839 | United States of America | — | Sources of Platte | — | 168528 |
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| Muhlenbergia ambigua Torr. | C. A. Geyer 446 | 12 Sep 1838 | United States of America | — | Stony banks of Lake Okaman,… | probable type | 381380 |
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| Homalobus stipitatus Rydb. | C. A. Geyer 163 | July 24, 1839 | United States of America | — | holotype | 11998 |
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| Verbena perriana Moldenke | C. A. Geyer s.n. | Jul 1842 | United States of America | Illinois | Cass Co. Beardstown | type | 138190 |
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| Penstemon speciosus Douglas | C. A. Geyer 641 | Jul 1845 | United States of America | — | Along Spokane River, Rocky Mountains | — | 660703 |
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| Penstemon speciosus Douglas | C. A. Geyer 641 | Jul 1845 | United States of America | — | Along Spokane River, Rocky Mountains | — | 660704 |
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| Moehringia lateriflora (L.) Fenzl | C. A. Geyer 21 | 26 Jul 1839 | United States of America | North Dakota | Dry woods at Devil's Lake | — | 431046 |
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| Penstemon eriantherus Pursh | C. A. Geyer 126 | 1839 | United States of America | — | — | 592989 |
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| Penstemon venustus Douglas ex Lindl. | C. A. Geyer 487 | 1845 | United States of America | — | Slope of the high table… | — | 762948 |
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| Solidago incana Torr. & A.Gray | C. A. Geyer 27 | 07 Jul 1839 | United States of America | — | Missouri portion of the prairie… | type | 259882 |
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| Solidago incana Torr. & A.Gray | C. A. Geyer 27 | 07 Jul 1839 | United States of America | — | Prairies, Miss. | type | 259883 |
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| Homalobus multiflorus Torr. | C. A. Geyer 163 | 1839 | United States of America | Missouri | Upper Missouri | — | 11999 |
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| Penstemon gracilis Nutt. subsp. gracilis | C. A. Geyer 127 | 19 Jun 1839 | United States of America | South Dakota | Stanley Co. | — | 600842 |
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| Aristida geyeriana Steud. | C. A. Geyer s.n. | Aug 1842 | United States of America | Illinois | Cass Co. Beardstown | type | 345843 |
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| Aristida geyeriana Steud. | C. A. Geyer s.n. | Aug 1842 | United States of America | Illinois | Cass Co. Beardstown | type | 345842 |
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| Astragalus triphyllus Pursh | C. A. Geyer s.n. | 1839 | United States of America | North Dakota | High prairie near Devils Lake. | — | 5740 |
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| Bryum caespiticium Hedw. | C. A. Geyer 676 | — | United States of America | — | Coeur d'Alene Mountains | — | 385515 | ||
| Besseya bullii (Eaton & Wright) Rydb. | C. A. Geyer s.n. | — | United States of America | — | — | 28843 |
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| Penstemon wilcoxii Rydb. | C. A. Geyer 642 | 1845 | United States of America | — | Valley of Kooskooski River. Rocky… | — | 772195 |
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| Verbena engelmannii Moldenke | C. A. Geyer s.n. | Jul 1842 | United States of America | Illinois | Beardstown | holotype | 138171 |
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| Penstemon grandiflorus Nutt. | C. A. Geyer 248 | 1845 | United States of America | — | Rocky Mountains | — | 601134 |
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| Penstemon grandiflorus Nutt. | C. A. Geyer 125 | April | United States of America | North Dakota | not far from Devil's Lake. | — | 601133 |
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| Penstemon grandiflorus Nutt. | C. A. Geyer 125 | s.d. | United States of America | — | — | 601112 |
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| Penstemon grandiflorus Nutt. | C. A. Geyer 125 | April | United States of America | Nebraska | Upper Missouri | — | 601108 |
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| Penstemon glaber Pursh var. glaber | C. A. Geyer 124 | 19 Jun 1839 | United States of America | South Dakota | Hills of Shian River, =… | — | 595796 |
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| Polygala alba var. suspecta S.Watson | C. A. Geyer s.n. | s.d. | United States of America | — | "N.W. Exped." | — | 406833 |
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| Entodon seductrix (Hedw.) Müll.Hal. | C. A. Geyer s.n. | 22 Jul 1839 | United States of America | North Dakota | Devil's Lake | — | 479542 |
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| Eriogonum umbellatum var. majus Benth. | C. A. Geyer s.n. | — | United States of America | — | Laramie Mountains | probable syntype | 323630 |
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| Solanum triflorum Nutt. | C. A. Geyer s.n. | 1839 | United States of America | — | About Fort Pierre | — | 820388 |
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| Ranunculus alismifolius Geyer ex Benth. | C. A. Geyer 306 | 1845 | United States of America | — | Rocky Mts. | isotype | 841921 |
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| Homalobus stipitatus Rydb. | C. A. Geyer 163 | July 24, 1839 | United States of America | — | isotype | 842187 |
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| Aster sericeus var. montanus A.Gray | C. A. Geyer 273 | s.d. | — | — | St. Peter's River | — | 990602 |
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| Carex sartwellii Dewey | C. A. Geyer 206 | — | United States of America | Nebraska | Council Bluffs | — | 1060578 |
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| Eleocharis coloradoensis (Britton) Gilly | C. A. Geyer | 1839 | United States of America | South Dakota | near James river | — | 1060572 |
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| Bouteloua dactyloides (Nutt.) Columbus | C. A. Geyer | 1839 | United States of America | South Dakota | Upper Missouri | — | 1060583 |
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