Displaying 1 - 25 out of 91 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Carlowrightia torreyana Wassh. | J. L. Riddell 2 | s.d. | United States of America | Texas | — | 3601484 |
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| Anoda cristata (L.) Schltdl. | J. L. Riddell 5 | Apr 1849 | United States of America | Texas | — | 3874002 |
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| Croton monanthogynus Michx. | J. L. Riddell 7 | s.d. | United States of America | Texas | — | 3973505 |
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| Solanum rostratum Dunal | J. L. Riddell 8 | s.d. | United States of America | Texas | — | 00820947 |
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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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| Hopia obtusa (Kunth) Zuloaga & Morrone | J. L. Riddell 11 | s.d. | United States of America | Texas | — | 1728755 |
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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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| Selaginella arenicola subsp. riddellii | J. L. Riddell 16 | s.d. | United States of America | Texas | — | 3505787 |
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| Acleisanthes longiflora A.Gray | J. L. Riddell 19 | s.d. | United States of America | Texas | — | 3371043 |
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| Euphorbia missurica Raf. | J. L. Riddell 22 | s.d. | United States of America | Texas | — | 4010347 |
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| Eriogonum tenellum var. ramosissimum Benth. | J. L. Riddell 23 | — | United States of America | Texas | syntype | 323577 |
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| Rhus virens Lindh. ex A.Gray subsp. virens | J. L. Riddell 26 | s.d. | — | — | — | 02555897 |
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| Eriogonum multiflorum Benth. | J. L. Riddell 27 | s.d. | United States of America | Texas | — | 3113538 |
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| Acalypha lindheimeri Müll.Arg. | J. L. Riddell 34 | s.d. | United States of America | Texas | — | 759212 |
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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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| Buddleja racemosa Torr. | J. L. Riddell 48 | 1840 | United States of America | Texas | lectotype | 990724 |
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| Acalypha rhomboidea Raf. | J. L. Riddell 49 | s.d. | United States of America | Ohio | — | 759215 |
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| Nyctaginia capitata Choisy | J. L. Riddell 51 | s.d. | United States of America | Texas | — | 3378463 |
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| Hedeoma drummondii subsp. reverchonii | J. L. Riddell 60 | 1840 | United States of America | Texas | — | 3031800 |
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| Hydrolea | J. L. Riddell 61 | s.d. | United States of America | Texas | — | 2707398 |
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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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| Vernonia maxima Small | J. L. Riddell 125 | 1834 | United States of America | Ohio | syntype | 274510 |
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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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| Xyris difformis Chapm. var. difformis | J. L. Riddell 1400 | — | — | — | — | 1169920 |
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