Displaying 26 - 50 out of 92 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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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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