Displaying 1 - 50 out of 92 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Acalypha gracilens A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | — | 759213 |
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| Acalypha lindheimeri Müll.Arg. | J. L. Riddell 34 | s.d. | United States of America | Texas | — | 759212 |
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| Acalypha ostryifolia Riddell ex J.M.Coult. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | Orleans Parish. New Orleans | type | 232986 |
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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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| Acalypha rhomboidea Raf. | J. L. Riddell 49 | s.d. | United States of America | Ohio | — | 759215 |
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| Acalypha virginica L. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | — | 759214 |
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| Acleisanthes longiflora A.Gray | J. L. Riddell 19 | s.d. | United States of America | Texas | — | 3371043 |
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| Actinella scaposa var. linearis Nutt. | J. L. Riddell s.n. | s.d. | United States of America | Texas | isotype | 149934 |
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| Anoda cristata (L.) Schltdl. | J. L. Riddell 5 | Apr 1849 | United States of America | Texas | — | 3874002 |
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| Aphanostephus riddellii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | isotype | 158333 |
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| Apocynum sibiricum Jacq. | J. L. Riddell s.n. | s.d. | United States of America | Ohio | — | 4175413 |
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| Arabis virginica (L.) Poir. | J. L. Riddell 106 | s.d. | United States of America | — | Red river country | — | 3171882 |
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| Aronia latifolia Riddell | J. L. Riddell s.n. | s.d. | United States of America | Kentucky | type | 418566 |
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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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| Baccharis halimifolia L. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | Orleans Parish. | — | 1899584 |
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| Bartramia patens Brid. | J. L. Riddell s.n. | s.d. | — | — | Kerguelen Island | — | 2083436 |
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| Bartramia patens Brid. | J. L. Riddell s.n. | s.d. | — | — | Kerguelen Island | — | 2083437 |
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| Bartramia patens Brid. | J. L. Riddell s.n. | s.d. | — | — | Kerguelen Island | — | 2083438 |
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| Bigelowia nuttallii L.C.Anderson | J. L. Riddell s.n. | — | United States of America | Texas | — | 1911554 |
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| Buddleja racemosa Torr. | J. L. Riddell 48 | 1840 | United States of America | Texas | lectotype | 990724 |
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| Bumelia lucida W.Small | J. L. Riddell | — | United States of America | Louisiana | probable syntype | 273371 |
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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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| Carlowrightia torreyana Wassh. | J. L. Riddell 2 | s.d. | United States of America | Texas | — | 3601484 |
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| Celtis mississippiensis Bosc | J. L. Riddell s.n. | — | United States of America | Louisiana | — | 2464258 |
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| Centauridium drummondii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 163123 |
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| Centaurium beyrichii (Torr. & A.Gray) B.L.Rob. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 169780 |
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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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| Chara michauxii (A.Braun) Kütz. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | — | 02019052 |
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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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| Clavigera riddellii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | isotype | 167569 |
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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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| Croton monanthogynus Michx. | J. L. Riddell 7 | s.d. | United States of America | Texas | — | 3973505 |
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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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| Dracopis amplexicaulis (Vahl) Cass. | J. L. Riddell 975 | s.d. | United States of America | Louisiana | Orleans Parish. | — | 2070034 |
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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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| Eragrostis reptans (Michx.) Nees | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | New Orleans | — | 1700330 |
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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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| Eriogonum multiflorum Benth. | J. L. Riddell 27 | s.d. | United States of America | Texas | — | 3113538 |
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| Eriogonum tenellum var. ramosissimum Benth. | J. L. Riddell 23 | — | United States of America | Texas | syntype | 323577 |
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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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| Euphorbia indivisa (Engelm.) Tidestr. | J. L. Riddell s.n. | 1855 | United States of America | Texas | Western Texas | — | 4009163 |
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| Euphorbia missurica Raf. | J. L. Riddell 22 | s.d. | United States of America | Texas | — | 4010347 |
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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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| Gutierrezia texana var. glutinosa (S.Schauer) M.A.Lane | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 2881248 |
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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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| Hedeoma drummondii subsp. reverchonii | J. L. Riddell 60 | 1840 | United States of America | Texas | — | 3031800 |
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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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| Heterotheca canescens (DC.) Shinners | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 2906119 |
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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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