Displaying 51 - 75 out of 92 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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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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| Centauridium drummondii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 163123 |
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| Melampodium leucanthum Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | type | 215015 |
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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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| Senecio riddellii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | holotype | 233413 |
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| Eriogonum tenellum var. ramosissimum Benth. | J. L. Riddell 23 | — | United States of America | Texas | syntype | 323577 |
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| Linosyris texana Torr. & A.Gray | J. L. Riddell 10 | s.d. | United States of America | Texas | — | 214248 |
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| Nyctaginia capitata Choisy | J. L. Riddell 51 | s.d. | United States of America | Texas | — | 3378463 |
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| Muhlenbergia expansa (Poir.) Trin. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 1748468 |
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| Acleisanthes longiflora A.Gray | J. L. Riddell 19 | s.d. | United States of America | Texas | — | 3371043 |
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| Croton monanthogynus Michx. | J. L. Riddell 7 | s.d. | United States of America | Texas | — | 3973505 |
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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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| 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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| Hypericum prolificum var. ß L. | J. L. Riddell s.n. | s.d. | United States of America | Ohio | Franklin Co. | possible type | 84837 |
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| Riddellia antiphylla Rafarin | J. L. Riddell s.n. | — | United States of America | Louisiana | Orleans Parish. | lectotype | 415522 |
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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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| Clavigera riddellii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | isotype | 167569 |
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| Acalypha virginica L. | J. L. Riddell s.n. | s.d. | United States of America | Louisiana | — | 759214 |
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| Sophora speciosa (Scheele) Benth. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — | 02628557 |
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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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| 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 lindheimeri Müll.Arg. | J. L. Riddell 34 | s.d. | United States of America | Texas | — | 759212 |
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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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