Displaying 1 - 25 out of 312 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Portulaca pilosa L. | M. C. Leavenworth 1 | s.d. | United States of America | Arkansas | — | 3582902 |
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| Poa arachnifera Torr. | M. C. Leavenworth 2 | 1835 | United States of America | Arkansas | — | 1784341 |
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| Eriogonum multiflorum Benth. | M. C. Leavenworth 5 | s.d. | United States of America | Arkansas | — | 3113518 |
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| Coreopsis major Walter | M. C. Leavenworth 154 | s.d. | United States of America | Florida | — | 2066165 |
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| Carex microrhyncha Mack. | M. C. Leavenworth 305 | — | United States of America | Texas | — | 2291620 |
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| Thevetia peruviana var. pinifolia Standl. & Steyerm. | M. C. Leavenworth 505 | 07 Aug 1940 | Mexico | Michoacán | Apatzingán Mun. Trail from Apatzingan… | isotype | 318420 |
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| Aster phyllolepis Torr. & A.Gray | M. C. Leavenworth IIs.n. | s.d. | United States of America | — | Arkansas ? [Protologue mentioned western… | syntype | 161981 |
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| Vesicaria nuttallii Torr. & A.Gray | M. C. Leavenworth s.n. | — | United States of America | — | Praries of Red River | isolectotype | 185839 |
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| Rhynchosia torreyi Vail | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Sand hills | holotype | 26923 |
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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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| Grossularia texensis Coville & A.Berger | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Near St. Augustine | isotype | 185886 |
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| Baptisia sphaerocarpa Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | — | Vicinity of Fort Towson. | — | 6170 |
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| Melothria grandifolia Torr. & A.Gray | M. C. Leavenworth s.n. | — | United States of America | — | Bottom of the Mississippi | possible type | 172478 |
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| Chaetanthera asteroides Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | — | Arkansas | — | 163309 | ||
| Carex flaccosperma Dewey | M. C. Leavenworth s.n. | 1845 | United States of America | — | Camp Sabine | probable isotype | 39366 |
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| Vicia ludoviciana Nutt. ex Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Nacogdoches Co. "Near Nagadoches" | lectotype | 50651 |
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| Phacelia glabra Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | — | Louisiana & Georgia | — | 83930 |
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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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| Asclepias feayi Chapm. ex A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Tampa Bay | type | 4648 |
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| Vitis incisa Nutt. | M. C. Leavenworth s.n. | — | — | — | syntype | 415159 |
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| Penstemon tubiflorus Nutt. var. tubiflorus | M. C. Leavenworth s.n. | May and June | United States of America | — | Vicinity Fort Towson | — | 663249 |
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| Rudbeckia alismifolia Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | "Louisiana & Texas" | syntype | 232822 |
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| Sophora tomentosa var. truncata Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Tampa Bay | lectotype | 26995 |
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| Sophora tomentosa var. truncata Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Tampa Bay | isotype | 26996 |
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| Coreopsis leavenworthii Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Near Fort Drane, eastern Florida | syntype | 167697 |
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