Displaying 76 - 125 out of 125 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Tridax coronopifolia (Kunth) Hemsl. | A. M. Powell 754 | 17 Aug 1961 | Mexico | Guerrero | Taxco de Alarcón Mun. Along… | — | ||||
| Tridax coronopifolia (Kunth) Hemsl. | A. M. Powell 753 | 17 Aug 1961 | Mexico | Guerrero | Taxco de Alarcón Mun. Along… | — | ||||
| Tridax mexicana A.M.Powell | A. M. Powell 658 | 13 Aug 1961 | Mexico | Puebla | Tehuacán Mun. Along route 125,… | — | ||||
| Tridax balbisioides (Kunth) A.Gray | A. M. Powell 566 | 6 Aug 1961 | Mexico | San Luis Potosí | San Luis Potosí Mun. Along… | — | ||||
| Tridax procumbens L. | A. M. Powell 565 | 6 Aug 1961 | Mexico | San Luis Potosí | San Luis Potosí Mun. Along… | — | ||||
| Tridax coronopifolia (Kunth) Hemsl. | A. M. Powell 570 | 6 Aug 1961 | Mexico | San Luis Potosí | San Luis Potosí Mun. Along… | — | ||||
| Tridax balbisioides (Kunth) A.Gray | A. M. Powell 569 | 6 Aug 1961 | Mexico | San Luis Potosí | San Luis Potosí Mun. Along… | — | ||||
| Perityle turneri A.M.Powell | A. M. Powell 1857 | 2 Apr 1970 | Mexico | Sinaloa | Concordia Mun. 2.2 mi E… | — | ||||
| Perityle lemmonii (A.Gray) A.M.Powell | A. M. Powell 1695 | 02 Apr 1969 | United States of America | Arizona | Pima Co. Just NW of… | — |
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| Errazurizia megacarpa (S.Watson) I.M.Johnst. | A. M. Powell 1727 | 23 Mar 1970 | Mexico | Baja California | 16 miles S of San… | — | ||||
| Marina parryi (Torr. & A.Gray) Barneby | A. M. Powell 1746 | 23 Mar 1970 | Mexico | Baja California | 24 miles S of Puertecitos | — | ||||
| Brongniartia minutifolia S.Watson | A. M. Powell 3631 | 29 Aug 1981 | United States of America | Texas | Brewster Co. low white hills,… | — |
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| Senegalia roemeriana (Scheele) Britton & Rose | A. M. Powell 3750 | 09 Jul 1982 | United States of America | Texas | Brewster Co. limestone hills W… | — |
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| Pomaria jamesii (Torr. & A.Gray) Walp. | A. M. Powell 2849 | 10 Jun 1976 | United States of America | Texas | Hudspeth Co. white gypsum dunes,… | — |
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| Amelanchier denticulata (Kunth) K.Koch | A. M. Powell 2810 | 07 Jun 1975 | United States of America | Texas | Presidio Co. Along the Right… | — |
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| Flaveria brownii A.M.Powell | A. M. Powell 2802 | 30 Dec 1974 | United States of America | Texas | San Patricio Co. Port Aransas,… | — |
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| Flaveria chlorifolia A.Gray | A. M. Powell 3036 | 18 Sep 1976 | United States of America | Texas | Culberson Co. Rustler Springs at… | — |
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| Flaveria trinervia (Spreng.) C.Mohr | A. M. Powell 3037 | 04 Sep 1976 | United States of America | Texas | Culberson Co. Rustler Springs at… | — |
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| Haploësthes greggii A.Gray var. greggii | A. M. Powell 2787 | 19 Jul 1974 | United States of America | Texas | Crosby Co. Near roadside, just… | — |
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| Haploesthes greggii var. texana (J.M.Coult.) I.M.Johnst. | A. M. Powell 2777 | 24 Jun 1974 | United States of America | Texas | Crane Co. Gypseous Flat, on… | — |
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| Hymenoxys linearifolia Hook. | A. M. Powell 1872 | 16 Apr 1970 | United States of America | Texas | Ward Co. 2 miles W… | — |
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| Isocoma veneta (Kunth) Greene | A. M. Powell 2788 | 24 Aug 1974 | United States of America | Texas | Culberson Co. roadside, Hwy 54,… | — |
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| Poliomintha incana (Torr.) A.Gray | A. M. Powell 2844 | 10 Jun 1976 | United States of America | Texas | Hudspeth Co. White gypsum dunes,… | — |
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| Perityle congesta (M.E.Jones) Shinners | A. M. Powell 1264 | 31 Jul 1964 | United States of America | Arizona | Coconino Co. In crevices of… | — |
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| Perityle gracilis (M.E.Jones) Rydb. | A. M. Powell 1272 | 03 Aug 1964 | United States of America | Nevada | Lincoln Co. Meadow Valley wash… | — |
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| Perityle inyoensis (Ferris) A.M.Powell | A. M. Powell 1275 | 04 Aug 1964 | United States of America | California | Inyo Co. In northeast-facing crevices… | — |
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| Perityle lemmonii (A.Gray) A.M.Powell | A. M. Powell 1255 | 14 Jul 1964 | United States of America | Texas | Brewster Co. 4 mi W… | — |
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| Perityle lindheimeri var. halimifolia (A.Gray) A.M.Powell | A. M. Powell 1234 | 20 Jun 1964 | United States of America | Texas | Val Verde Co. along creek… | — |
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| Perityle lindheimeri (A.Gray) Shinners var. lindheimeri | A. M. Powell 1235 | 20 Jun 1964 | United States of America | Texas | Kendall Co. Edge Falls near… | — |
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| Perityle lindheimeri (A.Gray) Shinners var. lindheimeri | A. M. Powell 1326 | 19 Jun 1965 | United States of America | Texas | Real Co. 13 miles west… | — |
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| Perityle megalocephala var. oligophylla A.M.Powell | A. M. Powell 1612 | 28 May 1968 | United States of America | California | Inyo Co. Rock bluffs, W.… | — |
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| Perityle megalocephala var. megalocephala | A. M. Powell 1274 | 03 Aug 1964 | United States of America | Nevada | Nye Co. ca. 16 mles… | — |
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| Perityle parryi A.Gray | A. M. Powell 1396 | 20 Mar 1966 | United States of America | Texas | Presidio Co. road cut along… | — |
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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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| Malperia tenuis S.Watson | A. M. Powell 1725 | 23 Mar 1970 | Mexico | Baja California | 16 mi S San Felipe | — |
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| Hofmeisteria fasciculata (Benth.) Walp. | A. M. Powell 1747 | 23 Mar 1970 | Mexico | Baja California | 24 mi S of Puertecitos | — |
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