Displaying 26 - 50 out of 92 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Persea palustris (Raf.) Sarg. | J. L. Riddell s.n. | May + June | United States of America | Louisiana | — | 2511664 |
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| Chara michauxii (A.Braun) Kütz. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | — | 02019052 |
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| Triphora trianthophoros subsp. trianthophoros | J. L. Riddell 1420 | s.d. | United States of America | Louisiana | — | 4170147 |
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| Jungermannia bicuspidata L. | J. L. Riddell | Jun 1842 | United States of America | New York | Dutchess Co. Cascade Brook at… | — | 243849 | ||
| Gentiana quinqueflora var. occidentalis A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Ohio | Franklin Co. Worthington, O. [Inferred… | possible type | 297647 |
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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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| Coreopsis tripteris L. | J. L. Riddell s.n. | s.d. | United States of America | Ohio | Franklin Co. | — | 2067087 |
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| Hypericum prolificum var. ß L. | J. L. Riddell s.n. | s.d. | United States of America | Ohio | Franklin Co. | possible type | 84837 |
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| Erechtites hieraciifolius (L.) Raf. ex DC. | J. L. Riddell s.n. | s.d. [1800s] | United States of America | Ohio | Franklin Co. Columbus. | — | 1582694 |
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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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| Vernonia maxima Small | J. L. Riddell 125 | 1834 | United States of America | Ohio | syntype | 274510 |
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| Symphyotrichum lanceolatum (Willd.) G.L.Nesom | J. L. Riddell s.n. | s.d. | United States of America | Ohio | — | 1851164 |
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| Symphyotrichum shortii (Lindl.) G.L.Nesom | J. L. Riddell s.n. | s.d. | United States of America | Ohio | — | 1869084 |
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| Acalypha rhomboidea Raf. | J. L. Riddell 49 | s.d. | United States of America | Ohio | — | 759215 |
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| Trillium nivale Riddell | J. L. Riddell s.n. | 1834 | United States of America | Ohio | type | 319887 |
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| Solidago riddellii Frank | J. L. Riddell s.n. | s.d. | United States of America | Ohio | type | 259946 |
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| Senecio obovatus Muhl. ex Willd. | J. L. Riddell s.n. | s.d. | United States of America | Ohio | — | 233387 |
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| Solidago ohioensis Riddell | J. L. Riddell s.n. | s.d. | United States of America | Ohio | probable type | 259924 |
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| Dryopteris cristata (L.) A.Gray | J. L. Riddell s.n. | 1834 | United States of America | Ohio | — | 3550796 |
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| Apocynum sibiricum Jacq. | J. L. Riddell s.n. | s.d. | United States of America | Ohio | — | 4175413 |
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| Eupatorium ageratifolium var. texense Torr. & A.Gray | J. L. Riddell 43 | s.d. | United States of America | Texas | Comanche Co. Sabinas Creek | type | 168753 |
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| Carlowrightia torreyana Wassh. | J. L. Riddell 2 | s.d. | United States of America | Texas | — | 3601484 |
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| Gymnosperma glutinosum (Spreng.) Less. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 2881296 |
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| Anoda cristata (L.) Schltdl. | J. L. Riddell 5 | Apr 1849 | United States of America | Texas | — | 3874002 |
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| Euphorbia missurica Raf. | J. L. Riddell 22 | s.d. | United States of America | Texas | — | 4010347 |
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