Displaying 1 - 25 out of 91 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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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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| 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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| Scutellaria saxatilis Riddell | J. L. Riddell s.n. | — | United States of America | Kentucky | Greenup Co. | isotype | 00415708 |
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| Iva caudata Small | J. L. Riddell s.n. | Nov 1838 | United States of America | Louisiana | Near New Orleans | syntype | 180266 |
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| Chamaesyce deltoidea (Engelm. ex Chapm.) Small var. deltoidea | J. L. Riddell | — | United States of America | Florida | Monroe Co. | — | 37376 |
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| Lonicera japonica Thunb. | J. L. Riddell | — | United States of America | Louisiana | Orleans Parish. | — | 785420 |
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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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| Eragrostis reptans (Michx.) Nees | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | New Orleans | — | 1700330 |
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| Dalea purpurea Vent. var. purpurea | J. L. Riddell 374 | s.d. | United States of America | Louisiana | Near Jackson [Feliciana Parish, i.… | — | 01277440 |
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| Oplismenus hirtellus subsp. setarius (Lam.) Mez ex Ekman | J. L. Riddell s.n. | s.d. | United States of America | — | Carrolton, La. [New Orleans, Louisiana.] | — | 1758580 |
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| Urochloa reptans (L.) Stapf | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | New Orl. [New Orleans]. | — | 1821268 |
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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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| Chromolaena ivifolia (L.) R.M.King & H.Rob. | J. L. Riddell s.n. | Nov 1838 | United States of America | Louisiana | Old field about New Orl.… | — | 2035988 |
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| Conyza ramosissima Cronquist | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | Orleans Parish. | — | 2054924 |
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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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| Dracopis amplexicaulis (Vahl) Cass. | J. L. Riddell 975 | s.d. | United States of America | Louisiana | Orleans Parish. | — | 2070034 |
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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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| Xyris difformis Chapm. var. difformis | J. L. Riddell 1400 | — | — | — | — | 1169920 |
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| Populus canadensis Moench | J. L. Riddell s.n. | — | — | — | "Colton Wood" | — | 2469076 |
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| Thelypteris normalis (C.Chr.) Moxley | J. L. Riddell s.n. | 1838 | United States of America | Louisiana | Swamp about New Orleans | — | 3794988 |
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| Thelypteris normalis (C.Chr.) Moxley | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | New Orleans | — | 3795009 |
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| Zizia aptera (A.Gray) Fernald var. aptera | J. L. Riddell 16 | — | United States of America | — | Red River country | — | 3519967 |
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| Helenium amarum (Raf.) H.Rock | J. L. Riddell s.n. | s.d. | United States of America | Arkansas | — | 2881664 |
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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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