Displaying 1 - 50 out of 312 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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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] | — |
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| Acacia angustissima var. hirta (Nutt.) B.L.Rob. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — |
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| Acacia angustissima var. hirta (Nutt.) B.L.Rob. | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | — |
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| Acacia lutea Leavenw. | M. C. Leavenworth s.n. | s.d. | United States of America | Alabama | holotype |
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| Achillea millefolium L. | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | — |
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| Acmella repens (Walter) Rich. | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | E. Florida | — |
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| Acmella repens (Walter) Rich. | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | — |
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| Adiantum capillus-veneris L. | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | — |
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| Aeschynomene viscidula Michx. | M. C. Leavenworth s.n. | May | United States of America | Florida | E Florida | — |
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| Agropyron Gaertn. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — |
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| Alophia drummondii (Graham) R.C.Foster | M. C. Leavenworth s.n. | s.d. | United States of America | — | Texas + Louisiana | — |
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| Amaranthus australis (A.Gray) J.D.Sauer | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Guadaloupe River | — |
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| Amorpha herbacea var. floridana (Rydb.) Wilbur | M. C. Leavenworth s.n. | — | United States of America | Florida | Hillsborough Co. Tampa Bay, Sea… | — |
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| Amorpha herbacea Walter | M. C. Leavenworth s.n. | — | United States of America | Florida | Hillsborough Co. Tampa | — |
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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 | — |
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| Amphianthus pusillus Torr. | M. C. Leavenworth s.n. | s.d. | United States of America | — | holotype |
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| Amsonia tabernaemontana var. salicifolia (Pursh) Woodson | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — |
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| Andropogon cabanisii Hack. | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | — |
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| Anemone caroliniana Walter | M. C. Leavenworth s.n. | s.d. | United States of America | — | Ark. + La. | — |
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| Aristida purpurea var. longiseta (Steud.) Vasey | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — |
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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 |
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| Asclepias perennis Walter | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Sabine Bottoms | — |
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| Asclepias verticillata L. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — |
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| Aster dumosus var. subulifolius Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | probable syntype |
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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 |
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| Astragalus crassicarpus Nutt. var. crassicarpus | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | — |
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| Astragalus crassicarpus Nutt. var. crassicarpus | M. C. Leavenworth s.n. | April & May | United States of America | Arkansas | — |
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| Astragalus distortus var. engelmannii (E.Sheld.) M.E.Jones | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Nacogdoches Co. Near Nacogdoches | — |
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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 | — |
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| Astragalus leptocarpus Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Near the Sabine River. | type |
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| Astragalus leptocarpus Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | holotype |
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| Astragalus nuttallianus DC. var. nuttallianus | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | Prairies near Fort Towson | — |
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| Astragalus pachycarpus Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | holotype |
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| Astranthium integrifolium (Michx.) Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | — | Texas & Louisiana. | — |
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| Atrema americana DC. | M. C. Leavenworth s.n. | — | United States of America | Arkansas | possible type |
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| Baccharis halimifolia L. | M. C. Leavenworth s.n. | 1848 | United States of America | Florida | St. Marks | — |
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| Baccharis halimifolia L. | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | — |
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| Balduina angustifolia (Pursh) B.L.Rob. | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | East Florida | — |
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| Baptisia australis (L.) R.Br. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | Prairies. | — |
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| Baptisia sphaerocarpa Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | — | Vicinity of Fort Towson. | — |
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| Berlandiera subacaulis var. ß Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | possible type |
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| Berlandiera tomentosa Nutt. ex Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | possible type |
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| Bidens leucantha Willd. | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Hillsborough Co. Tampa Bay | — |
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| Boerhavia erecta L. | M. C. Leavenworth s.n. | [pre 1862] | United States of America | Florida | [no specific locality] | — |
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| Boltonia diffusa Elliott | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | — |
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| Bouteloua rigidiseta (Steud.) Hitchc. | M. C. Leavenworth s.n. | 1837 | United States of America | — | Arkansas or Texas. | — |
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| Cacalia lanceolata Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | — |
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| Cacalia ovata Walter | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | — |
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| Cacalia ovata Walter | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | — |
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| Calopogon multiflorus Lindl. | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Tampa Bay | — |
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