Displaying 26 - 50 out of 280 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Arisaema dracontium (L.) Schott | Z. Pitcher s.n. | 1832 | Unknown | — | — |
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| Arundinaria | Z. Pitcher s.n. | s.d. | United States of America | — | Red River. | — |
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| Asclepias amplexicaulis L. | Z. Pitcher s.n. | 1832 | — | — | — |
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| Asclepias quadrifolia Jacq. | Z. Pitcher s.n. | s.d. | United States of America | Oklahoma | Muskogee Co. Cantonment Gibson, Arkansas | — |
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| Asclepias tuberosa var. interior (Woodson) Shinners | Z. Pitcher s.n. | s.d. | United States of America | Oklahoma | Muskogee Co. Cantonment Gibson | — |
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| Asclepias verticillata L. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Asclepias viridis Walter | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Aster dumosus var. strictior Torr. & A.Gray | Z. Pitcher s.n. | 1829 | United States of America | Michigan | Fort Gratiot | syntype |
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| Astranthium integrifolium (Michx.) Nutt. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Astranthium integrifolium (Michx.) Nutt. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Azolla filiculoides Lam. | Z. Pitcher s.n. | ealry 1800's | United States of America | — | Red River. | — |
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| Baptisia leucantha Torr. & A.Gray | Z. Pitcher s.n. | — | United States of America | Arkansas | — |
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| Baptisia leucophaea Nutt. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Barkhausia grandiflora Nutt. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | isotype |
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| Bidens bipinnata L. | Z. Pitcher s.n. | s.d. | United States of America | — | Red River [Texas, Oklahoma, Arkansas,… | — |
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| Bidens gracilenta Greene | Z. Pitcher s.n. | — | United States of America | Michigan | Fort Gratiot | — |
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| Bidens polylepis S.F.Blake | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Boltonia asteroides var. recognita (Fernald & Griscom) Cronquist | Z. Pitcher s.n. | s.d. | United States of America | — | Red River [Texas, Oklahoma, Arkansas,… | — |
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| Botrychium virginianum (L.) Sw. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | Red Riiver | — |
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| Bouteloua curtipendula (Michx.) Torr. | Z. Pitcher s.n. | s.d. | United States of America | Oklahoma | Muskogee Co. Cherokee Country near… | — |
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| Cacalia plantaginea (Raf.) Shinners | Z. Pitcher s.n. | s.d. | United States of America | — | Ark. or Mich. [Arkansas or… | — |
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| Callirhoe digitata Nutt. | Z. Pitcher s.n. | 1832 | United States of America | Arkansas | — |
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| Camassia angusta (Engelm. & A.Gray) Blank. | Z. Pitcher s.n. | 1832 | United States of America | Arkansas | — |
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| Campanulastrum americanum (L.) Small | Z. Pitcher s.n. | 1832 | United States of America | Arkansas | Red River | — |
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| Carex brunnescens (Pers.) Poir. | Z. Pitcher s.n. | — | — | — | Lake Superior. | — |
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