Displaying 1 - 25 out of 2994 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Abronia fragrans Nutt. ex Hook. | R. C. Rollins 1402 | 16 Jul 1936 | United States of America | Colorado | Chaffee Co. 4 miles north… | — |
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| Acalypha dioica S.Watson | R. C. Rollins 5865 | 16 Nov 1958 | Mexico | Nuevo León | Chipinque Mesa, southwest of Monterrey | — |
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| Acalypha hederacea Torr. | R. C. Rollins 5838 | 15 Nov 1958 | Mexico | Nuevo León | 3 miles south of Cadereyta… | — |
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| Acer glabrum Torr. | R. C. Rollins 709 | 06 Aug 1934 | United States of America | Wyoming | Johnson Co. | — |
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| Acer glabrum Torr. | R. C. Rollins 947 | 03 Jul 1935 | United States of America | Wyoming | Along Nash's Fork at Nelson's… | — |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | R. C. Rollins 1750 | 16 Jun 1937 | United States of America | Utah | Uintah Co. 14 miles west… | — |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | R. C. Rollins 1749 | 16 Jun 1937 | United States of America | Utah | Uintah Co. 14 miles west… | — |
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| Achnatherum lemmonii (Vasey) Barkworth | R. C. Rollins 1461 | 29 Jul 1936 | United States of America | Colorado | Gunnison Co. Near Meyers Gulch… | — |
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| Achnatherum lemmonii (Vasey) Barkworth | R. C. Rollins 1596 | 04 Sep 1936 | United States of America | Colorado | Gunnison Co. 1 mile north… | — |
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| Achnatherum lemmonii (Vasey) Barkworth | R. C. Rollins 1391 | 15 Jul 1936 | United States of America | Colorado | Lake Co. Near the Arkansas… | — |
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| Aconitum columbianum Nutt. var. columbianum | R. C. Rollins 51134 | 15 Jul 1951 | United States of America | Colorado | Hinsdale Co. near Nellie Creek,… | — |
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| Agastache pallidiflora subsp. pallidiflora var. greenei | R. C. Rollins 1521 | 13 Aug 1936 | United States of America | Colorado | San Juan Co. Rocky cliffs… | — |
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| Agastache urticifolia (Benth.) Kuntze var. urticifolia | R. C. Rollins 1458 | 27 Jul 1936 | United States of America | Colorado | Gunnison Co. near main hiway,… | — |
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| Ageratina hernandezii B.L.Turner | R. C. Rollins 5856 | 16 Nov 1958 | Mexico | Nuevo León | San Pedro Garza García Mun.… | — |
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| Ageratina rollinsii B.L.Turner | R. C. Rollins 5875 | 16 Nov 1958 | Mexico | Nuevo León | Chipinque Mesa, southwest of Monterrey | isotype |
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| Agoseris glauca var. dasycephala (Torr. & A.Gray) Jeps. | R. C. Rollins 57171 | 10 Jul 1957 | United States of America | Wyoming | Sheridan Co. Rocky Mountain Region;… | — |
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| Agrostis perennans (Walter) Tuck. | R. C. Rollins 1575 | 27 Aug 1936 | United States of America | Colorado | Ouray Co. 1 mile south… | — |
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| Aliciella haydenii (A.Gray) J.M.Porter | R. C. Rollins 7131 | 22 Apr 1971 | United States of America | New Mexico | San Juan Co. San Juan… | — |
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| Aliciella pentstemonoides (M.E.Jones) J.M.Porter | R. C. Rollins 51167 | 18 Jul 1951 | United States of America | Colorado | Gunnison Co. crevices of basaltic… | — |
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| Aliciella pinnatifida (Nutt. ex A.Gray) J.M.Porter | R. C. Rollins 1335 | 08 Jul 1936 | United States of America | Colorado | Saguache Co. Near the Flying… | — |
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| Aliciella pinnatifida (Nutt. ex A.Gray) J.M.Porter | R. C. Rollins 1306 | 01 Jul 1936 | United States of America | Colorado | Saguache Co. Rocky ground on… | — |
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| Aliciella pinnatifida (Nutt. ex A.Gray) J.M.Porter | R. C. Rollins 1192 | 21 Jun 1936 | United States of America | Colorado | Arapahoe Co. near Larkspur | — |
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| Aliciella pinnatifida (Nutt. ex A.Gray) J.M.Porter | R. C. Rollins 1233 | 24 Jun 1936 | United States of America | Colorado | Fremont Co. Dry hillside north… | — |
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| Allium acuminatum Hook. | R. C. Rollins 57293 | 07 Aug 1957 | United States of America | Colorado | Eagle Co. Cottonwood Pass, 13… | — |
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| Allium brevistylum S.Watson | R. C. Rollins 920 | 30 Jun 1935 | United States of America | Wyoming | Albany Co. along the Little… | — |
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