Displaying 151 - 225 out of 310 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Platanthera leucophaea (Nutt.) Lindl. | M. C. Leavenworth s.n. | 1837 | United States of America | Arkansas | — | 02507422 |
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| Desmodium laevigatum (Nutt.) DC. | M. C. Leavenworth s.n. | — | United States of America | Arkansas | — | 2566855 |
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| Desmodium rigidum (Elliott) DC. | M. C. Leavenworth s.n. | Sept, Oct | United States of America | Arkansas | — | 2568229 |
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| Carex retroflexa Muhl. ex Willd. | M. C. Leavenworth s.n. | — | United States of America | Arkansas | — | 2299396 |
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| Carex complanata Torr. & Hook. | M. C. Leavenworth s.n. | 1845 | United States of America | Arkansas | — | 2259866 |
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| Ilex decidua Walter | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 2519425 |
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| Gaillardia aestivalis var. fastigiata (Greene) Waterf. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 02240192 |
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| Phacelia hirsuta Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3208643 |
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| Acacia angustissima var. hirta (Nutt.) B.L.Rob. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 2716014 |
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| Polygonella americana (Fisch. & C.A.Mey.) Small | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3140160 |
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| Toxicoscordion nuttallii (A.Gray) Rydb. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3689721 |
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| Triodanis leptocarpa (Nutt.) Nieuwl. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3750512 |
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| Eriogonum multiflorum Benth. | M. C. Leavenworth 5 | s.d. | United States of America | Arkansas | — | 3113518 |
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| Crataegus spathulata Michx. | M. C. Leavenworth s.n. | April | United States of America | Arkansas | — | 2778273 |
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| Limnosciadium pinnatum (DC.) Mathias & Constance | M. C. Leavenworth s.n. | May | United States of America | Arkansas | — | 3485863 |
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| Amsonia tabernaemontana var. salicifolia (Pursh) Woodson | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 4161208 |
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| Aristida purpurea var. longiseta (Steud.) Vasey | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 1632409 |
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| Asclepias verticillata L. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3535684 |
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| Ceanothus herbaceus Raf. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3752644 |
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| Convolvulus incanus Vahl | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3502971 |
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| Eryngium leavenworthii Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3464672 |
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| Euphorbia bicolor Engelm. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3996533 |
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| Euphorbia missurica Raf. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 4010349 |
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| Evolvulus pilosus Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3503799 |
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| Galactia mississippiensis (Vail) Rydb. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 2569290 |
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| Gratiola brevifolia Raf. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3283396 |
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| Hedeoma acinoides Scheele | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3031491 |
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| Helianthemum rosmarinifolium Pursh | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3917621 |
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| Heliotropium tenellum (Nutt.) Torr. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3238976 |
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| Hypericum drummondii (Grev. & Hook.) Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3808554 |
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| Hypericum lobocarpum Gatt. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3820015 |
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| Koeleria pyramidata (Lam.) P.Beauv. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 1733490 |
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| Krameria lanceolata Torr. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3870729 |
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| Lechea tenuifolia Michx. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3938029 |
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| Liatris pycnostachya Michx. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3043856 |
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| Lindernia dubia (L.) Pennell | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3281707 |
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| Linum lewisii Pursh | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3726470 |
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| Minuartia michauxii (Fenzl) Farw. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3267868 |
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| Mirabilis linearis (Pursh) Heimerl | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 03376329 |
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| Monarda citriodora Cerv. ex Lag. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3042148 |
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| Neptunia lutea (Leavenw.) Benth. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 2717716 |
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| Oxalis stricta L. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3767146 |
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| Polygonum tenue Michx. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3152293 |
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| Sabatia angularis (L.) Pursh | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3583336 |
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| Spermolepis inermis (Nutt. ex DC.) Mathias & Constance | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3513053 |
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| Stenosiphon linifolium Britton | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3362291 |
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| Symphyotrichum sericeum (Vent.) G.L.Nesom | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 1858067 |
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| Thalictrum dasycarpum Fisch. & Avé-Lall. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 2800725 |
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| Triadenum tubulosum (Walter) Gleason | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3822798 |
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| Triadenum walteri (J.G.Gmel.) Gleason | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3827764 |
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| Utricularia subulata L. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 3847864 |
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| Unspecified | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 01064615 |
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| Sapindus drummondii Hook. & Arn. | M. C. Leavenworth s.n. | — | United States of America | Arkansas | around Fort Towson | — | 2491066 |
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| Stellaria nuttallii Torr. & A.Gray | M. C. Leavenworth s.n. | — | United States of America | Arkansas | Camp Sabine | syntype | 353076 |
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| Oenothera linifolia Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | La Prairies Ark. | — | 3359738 |
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| Cynosciadium digitatum DC. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | near the Boggy Arkansas | — | 3457107 |
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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 | — | 01266601 |
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| Psoralea cryptocarpa Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | syntype | 26764 |
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| Stellaria macropetala Torr. & A.Gray | M. C. Leavenworth s.n. | — | United States of America | Arkansas | possible type | 353073 |
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| Desmanthus leptolobus Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | type | 2010 |
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| Gratiola tenella Pennell | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | possible type | 68486 |
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| Rhynchosia latifolia Nutt. ex Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | type | 26911 |
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| Campylocera leptocarpa Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | — | 468029 | |||
| Astragalus leptocarpus Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | holotype | 5511 |
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| Haplopappus corymbosus Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | type | 17547 |
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| Psoralea floribunda Nutt. ex Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | syntype | 26778 |
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| Rhynchospora nivea Boeckeler | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | possible type | 51449 |
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| Phyllanthus polygonoides Nutt. ex Spreng. | M. C. Leavenworth | — | United States of America | Arkansas | isotype | 273015 |
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| Hypericum apocynifolium Small | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | syntype | 84804 |
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| Dolichos multiflorus Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | type | 7798 |
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| Dolichos multiflorus Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | type | 7799 |
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| Psoralea digitata Nutt. ex Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | syntype | 26771 |
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| Astragalus pachycarpus Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | holotype | 5585 |
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| Atrema americana DC. | M. C. Leavenworth s.n. | — | United States of America | Arkansas | possible type | 405723 |
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| Vicia leavenworthii Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | holotype | 50649 |
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