Displaying 1 - 25 out of 312 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Selenia aurea Nutt. | M. C. Leavenworth s.n. | 1832 - 1833 | United States of America | Texas | San Augustine Co. Ayish Bayou… | — | 1477275 |
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| Selenia aurea Nutt. | M. C. Leavenworth s.n. | 1832 - 1833 | United States of America | Texas | San Augustine Co. Ayish Bayou… | — | 1477274 |
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| Selenia aurea Nutt. | M. C. Leavenworth s.n. | 1832 - 1833 | United States of America | Texas | San Augustine Co. Ayish Bayou… | — | 1477276 |
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| Poa arachnifera Torr. | M. C. Leavenworth 2 | 1835 | United States of America | Arkansas | — | 1784341 |
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| Chapmannia floridana Torr. & A.Gray | M. C. Leavenworth s.n. | May 1836 | United States of America | Florida | Ft. King | type | 6401 |
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| Abutilon texense Torr. & A.Gray | M. C. Leavenworth s.n. | 1836 | United States of America | Oklahoma | Choctaw Co. near Fort Tows[on] | — | 3855425 |
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| Ranunculus laxicaulis Darby | M. C. Leavenworth s.n. | Apr 1837 - May 1837 | United States of America | — | it may be near Sabine… | — | 2789013 |
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| Astragalus distortus var. engelmannii (E.Sheld.) M.E.Jones | M. C. Leavenworth s.n. | May 1837 | United States of America | Texas | Red Lands of Texas | — | 01248620 |
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| Halea ludoviciana Torr. & A.Gray | M. C. Leavenworth s.n. | 06 Jun 1837 | United States of America | Louisiana | Western Louisiana | syntype | 178891 |
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| Bouteloua rigidiseta (Steud.) Hitchc. | M. C. Leavenworth s.n. | 1837 | United States of America | — | Arkansas or Texas. | — | 1644246 |
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| Platanthera leucophaea (Nutt.) Lindl. | M. C. Leavenworth s.n. | 1837 | United States of America | Arkansas | — | 02507422 |
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| Habranthus tubispathus (L'Hér.) Traub | M. C. Leavenworth s.n. | 1837 | United States of America | Texas | — | 03775566 |
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| Heteropogon melanocarpus (Elliott) Benth. | M. C. Leavenworth s.n. | Sep 1838 | United States of America | Florida | Fort King. | — | 1727821 |
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| Sagittaria graminea Michx. | M. C. Leavenworth s.n. | 1838 | United States of America | — | — | 3729049 |
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| Carex godfreyi Naczi | M. C. Leavenworth s.n. | 1839 | United States of America | — | Tampa Bay. | — | 2277925 |
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| Mimosa strigillosa Torr. & A.Gray | M. C. Leavenworth s.n. | 1839 | United States of America | Florida | Hillsborough Co. Tampa Bay | syntype | 2508 |
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| Ampelaster carolinianus (Walter) G.L.Nesom | M. C. Leavenworth s.n. | 1839 | United States of America | Florida | Hillsborough Co. Tampa Bay | — | 1884571 |
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| Eragrostis ciliaris (L.) R.Br. | M. C. Leavenworth s.n. | 1839 | United States of America | Florida | Hillsborough Co. Tampa Bay | — | 01884906 |
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| Dryopteris ludoviciana (Kunze) Small | M. C. Leavenworth s.n. | 1839 | United States of America | Florida | Tampa Bay | — | 3552138 |
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| Mentzelia floridana Nutt. ex Torr. & A.Gray | M. C. Leavenworth s.n. | 1839 | United States of America | Florida | Hillsborough Co. Tampa Bay. | type | 112200 |
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| Muhlenbergia | M. C. Leavenworth s.n. | 1840 | United States of America | Florida | St. Marks | — | 1760023 |
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| Carex flaccosperma Dewey | M. C. Leavenworth s.n. | 1845 | United States of America | — | Camp Sabine | probable isotype | 39366 |
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| Carex complanata Torr. & Hook. | M. C. Leavenworth s.n. | 1845 | United States of America | Arkansas | — | 2259866 |
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| Carex leavenworthii Dewey | M. C. Leavenworth s.n. | 1845 | United States of America | Louisiana | holotype | 380956 | |||
| Baccharis halimifolia L. | M. C. Leavenworth s.n. | 1848 | United States of America | Florida | St. Marks | — | 1899549 |
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