Displaying 1 - 42 out of 42 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Acamptopappus sphaerocephalus (Harv. & A.Gray) A.Gray | D. M. Crooks s.n. | 21 Apr 1938 | United States of America | Arizona | Yuma Co. Yuma | — | 1824371 |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Mohave Co. Burro Creek., on… | — | 1553476 |
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| Ambrosia eriocentra (A.Gray) W.W.Payne | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. Santa Maria River.… | — | 1883851 |
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| Asteraceae | D. M. Crooks s.n. | 22 Apr 1937 | United States of America | Arizona | Gila River, Dome | — | 3200140 |
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| Atriplex polycarpa (Torr.) S.Watson | D. M. Crooks s.n. | 22 Apr 1938 | United States of America | Arizona | Yuma Co. Gila River at… | — | 3334926 |
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| Brickellia atractyloides A.Gray | D. M. Crooks s.n. | 18 Apr 1938 | United States of America | Arizona | Maricopa Co. Wickenberg, 10 miles… | — | 2028029 |
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| Camissonia arenaria (A.Nelson) P.H.Raven | D. M. Crooks s.n. | 23 Apr 1938 | United States of America | Arizona | Yuma Co. Gila Mountains | — | 03169421 |
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| Camissonia brevipes (A.Gray) P.H.Raven | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Mohave Co. Wikieup, s. e.… | — | 02697880 |
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| Camissonia claviformis subsp. yumae (P.H.Raven) P.H.Raven | D. M. Crooks s.n. | 23 Apr 1938 | United States of America | Arizona | 10 miles east of Yuma | — | 3264194 |
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| Camissonia refracta (S.Watson) P.H.Raven | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | 10 miles west of Burro… | — | 3275946 |
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| Centrostegia thurberi (A.Gray ex Benth.) S.Watson | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Round Valley, 20 miles NW… | — | 3063824 |
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| Cryptantha barbigera (A.Gray) Greene | D. M. Crooks s.n. | 21 Apr 1938 | United States of America | Arizona | 5 miles north of Yuma | — | 3213693 |
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| Cryptantha tumulosa (Payson) Payson | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Mohave Co. 1 mile west… | — | 3224885 |
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| Delphinium parishii A.Gray subsp. parishii | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Mohave Co. 0 miles W… | — | 2751616 |
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| Delphinium parishii A.Gray subsp. parishii | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Mohave Co. 10 miles west… | — | 2751618 |
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| Dyssodia porophylloides A.Gray | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Maricopa Co. | — | 2070825 |
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| Eremogone macradenia (S.Watson) Ikonn. var. macradenia | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Mohave Co. 1 mile west… | — | 3226379 |
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| Ericameria linearifolia (DC.) Urbatsch & Wussow | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Congree Junction | — | 2075996 |
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| Eriogonum maculatum A.Heller | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. Santa Maria River.… | — | 3103313 |
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| Gilia inconspicua (Sm.) Sweet | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. 10 miles east… | — | 3291726 |
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| Hymenopappus filifolius var. lugens (Greene) Jeps. | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Mohave Co. 1 mile west… | — | 2915687 |
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| Hyptis emoryi Torr. | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Mohave Co. Burrow Creek, between… | — | 3039134 |
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| Keckiella antirrhinoides var. microphylla (A.Gray) N.H.Holmgren | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. Santa Maria River.… | — | 786741 |
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| Langloisia setosissima (Torr. & A.Gray) Greene | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | On road from Hillside to… | — | 3301925 |
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| Lotus humistratus Greene | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Maricopa Co. | — | 2582055 |
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| Lotus rigidus (Benth.) Greene | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. Congress Junction | — | 2585181 |
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| Mahonia haematocarpa (Wooton) Fedde | D. M. Crooks s.n. | 12 Apr 1939 | United States of America | Arizona | Cave Creek, Chiricahua Mts. | — | 3831395 |
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| Malacothrix stebbinsii W.S.Davis & P.H.Raven | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. 10 miles west… | — | 3078890 |
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| Mentzelia nitens Greene | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. 10 miles east… | — | 3600531 |
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| Mirabilis laevis var. villosa (Kellogg) Spellenb. | D. M. Crooks s.n. | 18 Apr 1938 | United States of America | Arizona | Maricopa Co. 10 miles south… | — | 3376253 |
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| Palafoxia arida B.L.Turner & M.I.Morris | D. M. Crooks s.n. | 23 Apr 1938 | United States of America | Arizona | 20 miles east of Yuma | — | 3119951 |
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| Pediastrum boryanum (Turpin) Menegh. | F. E. Drouet | D. Richards | D. M. Crooks | L. D. Benson | R. A. Darrow 2774 | 30 Oct 1939 | United States of America | Arizona | Pima Co. University of Arizona… | — | 03052211 |
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| Phacelia distans Benth. | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. 10 miles west… | — | 3193959 |
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| Physaria newberryi A.Gray | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | 1 mile west of Burrow… | — | 3188397 |
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| Salazaria mexicana Torr. | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. Santa Maria River,… | — | 3092983 |
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| Solanum umbelliferum Eschsch. | D. M. Crooks s.n. | 19 Apr 1938 | United States of America | Arizona | Yavapai Co. McCloud Mts. near… | — | 00820535 |
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| Sophora arizonica S.Watson | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Mohave Co. 20 miles north… | — | 2628341 |
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| Sphaeralcea ambigua A.Gray | D. M. Crooks s.n. | 23 Apr 1938 | United States of America | Arizona | Yuma Co. Gila Mts. | — | 3971289 |
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| Streptanthus cordatus Nutt. ex Torr. & A.Gray | D. M. Crooks s.n. | 20 Apr 1938 | United States of America | Arizona | Mohave Co. 1 mile west… | — | 3155969 |
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| Tiquilia palmeri (A.Gray) A.T.Richardson | D. M. Crooks s.n. | 23 Apr 1938 | United States of America | Arizona | 10 miles east of Yuma,… | — | 3249718 |
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| Tiquilia plicata (Torr.) A.T.Richardson | D. M. Crooks s.n. | 18 Apr 1938 | United States of America | Arizona | Maricopa Co. 10 miles south… | — | 3249765 |
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| Unspecified | D. M. Crooks s.n. | 18 Apr 1938 | United States of America | Arizona | 10 miles west of Wickenberg | — | 3876454 |
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