Displaying 1 - 25 out of 92 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Acalypha gracilens A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | — | 759213 |
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| Acalypha lindheimeri Müll.Arg. | J. L. Riddell 34 | s.d. | United States of America | Texas | — | 759212 |
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| Acalypha ostryifolia Riddell ex J.M.Coult. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | Orleans Parish. New Orleans | type | 232986 |
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| Acalypha rhomboidea Raf. | J. L. Riddell s.n. | 1834 | United States of America | Ohio | [likely collected in Worthington County,… | — | 03349951 |
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| Acalypha rhomboidea Raf. | J. L. Riddell 49 | s.d. | United States of America | Ohio | — | 759215 |
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| Acalypha virginica L. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | — | 759214 |
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| Acleisanthes longiflora A.Gray | J. L. Riddell 19 | s.d. | United States of America | Texas | — | 3371043 |
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| Actinella scaposa var. linearis Nutt. | J. L. Riddell s.n. | s.d. | United States of America | Texas | isotype | 149934 |
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| Anoda cristata (L.) Schltdl. | J. L. Riddell 5 | Apr 1849 | United States of America | Texas | — | 3874002 |
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| Aphanostephus riddellii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | isotype | 158333 |
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| Apocynum sibiricum Jacq. | J. L. Riddell s.n. | s.d. | United States of America | Ohio | — | 4175413 |
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| Arabis virginica (L.) Poir. | J. L. Riddell 106 | s.d. | United States of America | — | Red river country | — | 3171882 |
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| Aronia latifolia Riddell | J. L. Riddell s.n. | s.d. | United States of America | Kentucky | type | 418566 |
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| Aster oolentangiensis Riddell | J. L. Riddell s.n. | s.d. | United States of America | Ohio | Franklin Co. Worthington, O. [Inferred… | isotype | 161964 |
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| Baccharis halimifolia L. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | Orleans Parish. | — | 1899584 |
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| Bartramia patens Brid. | J. L. Riddell s.n. | s.d. | — | — | Kerguelen Island | — | 2083436 |
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| Bartramia patens Brid. | J. L. Riddell s.n. | s.d. | — | — | Kerguelen Island | — | 2083437 |
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| Bartramia patens Brid. | J. L. Riddell s.n. | s.d. | — | — | Kerguelen Island | — | 2083438 |
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| Bigelowia nuttallii L.C.Anderson | J. L. Riddell s.n. | — | United States of America | Texas | — | 1911554 |
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| Buddleja racemosa Torr. | J. L. Riddell 48 | 1840 | United States of America | Texas | lectotype | 990724 |
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| Bumelia lucida W.Small | J. L. Riddell | — | United States of America | Louisiana | probable syntype | 273371 |
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| Carex crus-corvi Shuttlew. ex Kuntze | J. L. Riddell s.n. | — | United States of America | Louisiana | Orleans Parish. | — | 2261537 |
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| Carlowrightia torreyana Wassh. | J. L. Riddell 2 | s.d. | United States of America | Texas | — | 3601484 |
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| Celtis mississippiensis Bosc | J. L. Riddell s.n. | — | United States of America | Louisiana | — | 2464258 |
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| Centauridium drummondii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 163123 |
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