Displaying 1 - 50 out of 92 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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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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| Trillium nivale Riddell | J. L. Riddell s.n. | 1834 | United States of America | Ohio | type | 319887 |
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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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| Iva caudata Small | J. L. Riddell s.n. | Nov 1838 | United States of America | Louisiana | Near New Orleans | syntype | 180266 |
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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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| Riddellia antiphylla Rafarin | J. L. Riddell s.n. | Nov 1838 | United States of America | Louisiana | Orleans Parish. | probable isotype | 415523 |
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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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| Buddleja racemosa Torr. | J. L. Riddell 48 | 1840 | United States of America | Texas | lectotype | 990724 |
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| Melothria coccinea Riddell | J. L. Riddell s.n. | 1840 | United States of America | Texas | possible type | 172476 |
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| Hedeoma drummondii subsp. reverchonii | J. L. Riddell 60 | 1840 | United States of America | Texas | — | 3031800 |
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| Jungermannia bicuspidata L. | J. L. Riddell | Jun 1842 | United States of America | New York | Dutchess Co. Cascade Brook at… | — | 243849 | ||
| Anoda cristata (L.) Schltdl. | J. L. Riddell 5 | Apr 1849 | United States of America | Texas | — | 3874002 |
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| Euphorbia indivisa (Engelm.) Tidestr. | J. L. Riddell s.n. | 1855 | United States of America | Texas | Western Texas | — | 4009163 |
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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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| 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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| 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. | 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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| Euphorbia missurica Raf. | J. L. Riddell 22 | s.d. | United States of America | Texas | — | 4010347 |
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| Hopia obtusa (Kunth) Zuloaga & Morrone | J. L. Riddell 11 | s.d. | United States of America | Texas | — | 1728755 |
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| Selaginella arenicola subsp. riddellii | J. L. Riddell 16 | s.d. | United States of America | Texas | — | 3505787 |
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| Eriogonum multiflorum Benth. | J. L. Riddell 27 | s.d. | United States of America | Texas | — | 3113538 |
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| Seymeria texana (A.Gray) Pennell | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 3321288 |
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| Pellaea ovata (Desv.) Weath. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 3496495 |
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| Bigelowia nuttallii L.C.Anderson | J. L. Riddell s.n. | — | United States of America | Texas | — | 1911554 |
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| Paronychia lindheimeri Engelm. ex A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 3308137 |
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| Serenoa serrulata (Michx.) Hook.f. ex B.D.Jacks. | J. L. Riddell s.n. | — | United States of America | Texas | — | 02319841 |
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| Tillandsia recurvata (L.) L. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 3732928 |
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| Solanum rostratum Dunal | J. L. Riddell 8 | s.d. | United States of America | Texas | — | 00820947 |
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| Salvia ballotiflora Benth. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 3093489 |
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| Hydrolea | J. L. Riddell 61 | s.d. | United States of America | Texas | — | 2707398 |
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| Heterotheca canescens (DC.) Shinners | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 2906119 |
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