Displaying 1 - 75 out of 280 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Acacia angustissima var. hirta (Nutt.) B.L.Rob. | Z. Pitcher s.n. | s.d. | United States of America | — | Red River | — |
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| Acalypha monococca (Engelm. ex A.Gray) Lill.W.Mill. & Gandhi | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Acalypha virginica L. | Z. Pitcher s.n. | — | — | — | — |
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| Achillea millefolium L. | Z. Pitcher s.n. | 1829 | United States of America | — | Fort Gratiot | — |
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| Adenocaulon bicolor Hook. | Z. Pitcher s.n. | 24 Jun 1826 | United States of America | Michigan | Chippewa Co. Lake Superior. [St.… | — |
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| Agalinis fasciculata (Elliott) Raf. | Z. Pitcher s.n. | 1832 | United States of America | Arkansas | Red River | — |
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| Agastache scrophulariifolia (Willd.) Kuntze | Z. Pitcher s.n. | s.d. | United States of America | — | Red River | — |
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| Agrimonia eupatoria var. mollis Torr. & A.Gray | Z. Pitcher s.n. | s.d. | United States of America | — | lectotype |
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| Agrostis | Z. Pitcher 16 | 1827 | — | — | Shores of Lake Superior. | — |
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| Allium canadense L. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | [No specific locality] | — |
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| Allium canadense var. mobilense (Regel) Ownbey | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Amaranthus rudis J.D.Sauer | Z. Pitcher s.n. | 1832 | United States of America | Arkansas | — |
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| Ambrosia bidentata Michx. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Ambrosia trifida L. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | Red River | — |
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| Ammannia coccinea Rottb. | Z. Pitcher s.n. | 1832 | Unknown | — | — |
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| Amorpha fruticosa L. | Z. Pitcher s.n. | — | United States of America | Arkansas | — |
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| Amphicarpaea pitcheri Torr. & A.Gray | Z. Pitcher s.n. | s.d. | United States of America | — | Red River | type |
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| Amsonia tabernaemontana Walter | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Amsonia tabernaemontana Walter | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Anemone caroliniana Walter | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Antennaria howellii subsp. petaloidea (Fernald) R.J.Bayer | Z. Pitcher s.n. | s.d. | — | — | Lake Superior. | — |
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| Arabis canadensis L. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Arabis laevigata (Muhl. ex Willd.) Poir. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Arabis lyrata L. var. lyrata | Z. Pitcher s.n. | 1829 | — | — | Lake Superior | — |
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| Arenaria pitcheri Nutt. ex Torr. & A.Gray | Z. Pitcher s.n. | — | United States of America | Arkansas | — |
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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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| Carex echinata Murray subsp. echinata | Z. Pitcher s.n. | — | United States of America | Michigan | Chippewa Co. Sault Ste. Marie.… | — |
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| Carex muhlenbergii Schkuhr | Z. Pitcher s.n. | — | United States of America | — | Fort Gratiot, Michigan Territory | — |
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| Ceanothus americanus L. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Cerastium brachypodum (Engelm. ex A.Gray) B.L.Rob. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Chrysopsis pilosa Nutt. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | Clay barrens. | — |
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| Cirsium muticum Michx. | Z. Pitcher s.n. | s.d. | United States of America | Michigan | Fort Gratiot. | — |
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| Clematis pitcheri Torr. & A.Gray | Z. Pitcher s.n. | s.d. | United States of America | — | Red River | holotype |
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| Cnicus pitcheri Torr. | Z. Pitcher s.n. | s.d. | United States of America | — | On the great sand banks… | type |
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| Cocculus carolinus (L.) DC. | Z. Pitcher s.n. | s.d. | United States of America | — | Red River | — |
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| Collinsia violacea Nutt. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Collinsia violacea Nutt. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Collinsia violacea Nutt. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Collinsia violacea Nutt. | Z. Pitcher | s.d. | United States of America | Arkansas | possible type |
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| Commelina erecta L. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Coreopsis grandiflora Hogg ex Sweet | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Coreopsis lanceolata L. | Z. Pitcher s.n. | s.d. | Canada | — | North Shore of Lake Superior. | — |
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| Coryphantha missouriensis (Sweet) Britton & Rose | Z. Pitcher | 1830 | United States of America | Arkansas | Red River | — |
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| Crotalaria sagittalis L. | Z. Pitcher s.n. | s.d. | — | — | — |
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| Croton glandulosus L. var. glandulosus | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Croton michauxii var. elliptica (Willd.) B.W.van Ee & P.E.Berry | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Croton monanthogynus Michx. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Cuphea petiolata Pohl ex Koehne | Z. Pitcher s.n. | 1832 | Unknown | — | — |
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| Cyperus lupulinus (Spreng.) Marcks subsp. lupulinus | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Cyperus squarrosus L. | Z. Pitcher s.n. | s.d. | United States of America | Arkansas | — |
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| Cypripedium acaule Aiton | Z. Pitcher s.n. | s.d. | United States of America | Michigan | Chippewa Co. St. Mary -… | — |
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