Displaying 1 - 25 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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