Displaying 1 - 25 out of 88 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Tridax mexicana A.M.Powell | A. M. Powell 757 | 18 Aug 1961 | Mexico | Guerrero | Acapulco, east side of city | isotype |
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| Perityle turneri A.M.Powell | A. M. Powell 1858 | 02 Apr 1970 | Mexico | Chihuahua | 3.4 miles east of El… | isotype |
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| Selinocarpus gypsophilus B.A.Fowler | A. M. Powell 2105 | 25 May 1971 | Mexico | Chihuahua | Ca. 15 miles southwest of… | isotype |
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| Flaveria anomala B.L.Rob. | A. M. Powell 2568 | 20 Aug 1973 | Mexico | San Luis Potosí | Matehuala Mun. 1 mi N… | — |
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| Layia glandulosa (Hook.) Hook. & Arn. | A. M. Powell 1806 | 26 Mar 1970 | Mexico | Baja California | About 10 mi NE of… | — |
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| Flaveria oppositifolia (DC.) Rydb. | A. M. Powell 2710 | 21 May 1974 | Mexico | Coahuila | 3 mi NW of Nadadores | — |
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| Calycoseris wrightii A.Gray | A. M. Powell 1761 | 24 March 1970 | Mexico | Baja California | 18 miles S of Bahia… | — |
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| Heuchera wellsiae R.A.Folk | A. M. Powell 1860 | 02 Apr 1970 | Mexico | Durango | 3.4 miles E of El… | holotype |
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| Flaveria Juss. | A. M. Powell 2611 | 22 Aug 1973 | Mexico | Coahuila | 39 miles N of San… | — |
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| Flaveria oppositifolia (DC.) Rydb. | A. M. Powell 2551 | 20 Aug 1973 | Mexico | Coahuila | Arteaga Mun. Low places at… | — |
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| Flaveria anomala B.L.Rob. | A. M. Powell 2559 | 20 Aug 1973 | Mexico | Nuevo León | Galeana Mun. 7.5 mi S… | — |
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| Flaveria anomala B.L.Rob. | A. M. Powell 2579 | 21 Aug 1973 | Mexico | San Luis Potosí | Matehuala Mun. 28 mi S… | — |
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| Ambrosia ambrosioides (Cav.) Payne | A. M. Powell 1838 | 29 Mar 1970 | Mexico | Baja California Sur | 11 mi W Loreto and… | — |
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| Haploesthes robusta I.M.Johnst. | A. M. Powell 2619 | 23 Aug 1973 | Mexico | Coahuila | Ca. 3-4 mi SW of… | — |
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| Flaveria oppositifolia (DC.) Rydb. | A. M. Powell 2593 | 21 Aug 1973 | Mexico | Zacatecas | 55 mi N of junction… | — |
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| Machaeranthera pinnatifida (Hook.) Shinners | A. M. Powell 1757 | 24 Mar 1970 | Mexico | Baja California | 18 mi S of Bahía… | — |
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| Chaenactis stevioides Hook. & Arn. | A. M. Powell 1800 | 25 Mar 1970 | Mexico | Baja California | Ca. 27 miles W of… | — |
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| Brickellia | A. M. Powell 1805a | 25 Mar 1970 | Mexico | Baja California | 4 mi S of Bahia… | — |
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| Ambrosia dumosa (A.Gray) W.W.Payne | A. M. Powell 1735 | 23 Mar 1970 | Mexico | Baja California | 16 mi S San Felipe | — |
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| Ambrosia magdalenae (Brandegee) W.W.Payne | A. M. Powell 1769 | 24 Mar 1970 | Mexico | Baja California | Intersection of main road down… | — |
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| Ambrosia chenopodiifolia (Benth.) W.W.Payne | A. M. Powell 1816 | 26 Mar 1970 | Mexico | Baja California | 10 mi NW of El… | — |
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| Ambrosia ambrosioides (Cav.) Payne | A. M. Powell 1766 | 24 Mar 1970 | Mexico | Baja California | 18 mi S of Bahía… | — |
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| Ambrosia ilicifolia (A.Gray) W.W.Payne | A. M. Powell 1751 | 23 Mar 1970 | Mexico | Baja California | About 10 mi S of… | — |
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| Chaenactis lacera Greene | A. M. Powell 1810 | 26 Mar 1970 | Mexico | Baja California Sur | Los Cabos Mun. San Jose… | — |
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| Malacothrix glabrata (A.Gray ex D.C. Eaton) A.Gray | A. M. Powell 1765 | 24 Mar 1970 | Mexico | Baja California | 18 mi S of Bahía… | — |
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