Displaying 26 - 50 out of 92 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Euphorbia missurica Raf. | J. L. Riddell 22 | 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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| Selaginella arenicola subsp. riddellii | J. L. Riddell 16 | s.d. | United States of America | Texas | — |
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| Eriogonum multiflorum Benth. | J. L. Riddell 27 | s.d. | United States of America | Texas | — |
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| Seymeria texana (A.Gray) Pennell | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Pellaea ovata (Desv.) Weath. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Bigelowia nuttallii L.C.Anderson | J. L. Riddell s.n. | — | United States of America | Texas | — |
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| Paronychia lindheimeri Engelm. ex A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Serenoa serrulata (Michx.) Hook.f. ex B.D.Jacks. | J. L. Riddell s.n. | — | United States of America | Texas | — |
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| Tillandsia recurvata (L.) L. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Solanum rostratum Dunal | J. L. Riddell 8 | s.d. | United States of America | Texas | — |
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| Buddleja racemosa Torr. | J. L. Riddell 48 | 1840 | United States of America | Texas | lectotype |
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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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| Salvia ballotiflora Benth. | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Hydrolea | J. L. Riddell 61 | s.d. | United States of America | Texas | — |
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| Heterotheca canescens (DC.) Shinners | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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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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| Centauridium drummondii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | — |
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| Melampodium leucanthum Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | type |
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| Melothria coccinea Riddell | J. L. Riddell s.n. | 1840 | United States of America | Texas | possible type |
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| Actinella scaposa var. linearis Nutt. | J. L. Riddell s.n. | s.d. | United States of America | Texas | isotype |
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| Senecio riddellii Torr. & A.Gray | J. L. Riddell s.n. | s.d. | United States of America | Texas | holotype |
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| Eriogonum tenellum var. ramosissimum Benth. | J. L. Riddell 23 | — | United States of America | Texas | syntype |
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| Linosyris texana Torr. & A.Gray | J. L. Riddell 10 | s.d. | United States of America | Texas | — |
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| Nyctaginia capitata Choisy | J. L. Riddell 51 | s.d. | United States of America | Texas | — |
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