Displaying 26 - 50 out of 92 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Centaurium beyrichii (Torr. & A.Gray) B.L.Rob. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Chamaesyce deltoidea (Engelm. ex Chapm.) Small var. deltoidea | J. L. Riddell | — | United States of America | Florida | Monroe Co. | — |
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| Chara michauxii (A.Braun) Kütz. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | — |
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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.… | — |
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| Clavigera riddellii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | isotype |
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| Conyza ramosissima Cronquist | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | Orleans Parish. | — |
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| Coreopsis tripteris L. | J. L. Riddell s.n. | s.d. | United States of America | Ohio | Franklin Co. | — |
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| Croton monanthogynus Michx. | J. L. Riddell 7 | s.d. | United States of America | Texas | — |
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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.… | — |
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| Dracopis amplexicaulis (Vahl) Cass. | J. L. Riddell 975 | s.d. | United States of America | Louisiana | Orleans Parish. | — |
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| Dryopteris cristata (L.) A.Gray | J. L. Riddell s.n. | 1834 | United States of America | Ohio | — |
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| Eragrostis reptans (Michx.) Nees | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | New Orleans | — |
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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. | — |
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| Eriogonum multiflorum Benth. | J. L. Riddell 27 | s.d. | United States of America | Texas | — |
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| Eriogonum tenellum var. ramosissimum Benth. | J. L. Riddell 23 | — | United States of America | Texas | syntype |
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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 |
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| Euphorbia indivisa (Engelm.) Tidestr. | J. L. Riddell s.n. | 1855 | United States of America | Texas | Western Texas | — |
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| Euphorbia missurica Raf. | J. L. Riddell 22 | s.d. | United States of America | Texas | — |
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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 |
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| Gutierrezia texana var. glutinosa (S.Schauer) M.A.Lane | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Gymnosperma glutinosum (Spreng.) Less. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Hedeoma drummondii subsp. reverchonii | J. L. Riddell 60 | 1840 | United States of America | Texas | — |
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| Helenium amarum (Raf.) H.Rock | J. L. Riddell s.n. | s.d. | United States of America | Arkansas | — |
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| Heterotheca canescens (DC.) Shinners | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Hopia obtusa (Kunth) Zuloaga & Morrone | J. L. Riddell 11 | s.d. | United States of America | Texas | — |
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