Displaying 1 - 50 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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| Quercus hinckleyi C.H.Müll. | A. M. Powell 2800 | 01 Nov 1974 | United States of America | Texas | Presidio Co. Ca. 50 yards… | — |
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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,… | isotype |
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| Penstemon ambiguus Torr. | A. M. Powell 2848 | 10 Jun 1976 | United States of America | Texas | Hudspeth Co. White gypsum dunes,… | — |
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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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| Perityle warnockii A.M.Powell | A. M. Powell 1311 | 11 Oct 1964 | United States of America | Texas | Val Verde Co. Ca. 40-50… | isotype |
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| Perityle fosteri A.M.Powell | A. M. Powell 3365 | 03 Jul 1978 | United States of America | Texas | Culberson Co. Apache Mts., Panther… | 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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| Dalea formosa Torr. | A. M. Powell 3070 | 25 Mar 1977 | United States of America | Texas | Val Verde Co. Langtry. | — |
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| Dalea formosa Torr. | A. M. Powell 3071 | 25 Mar 1977 | United States of America | Texas | Terrell Co. hills 3 mi… | — |
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| Dalea formosa Torr. | A. M. Powell 3067 | 21 Mar 1977 | United States of America | Texas | Terrell Co. 12 mi E… | — |
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| Dalea formosa Torr. | A. M. Powell 1561 | 10 Apr 1968 | United States of America | Texas | Hudspeth Co. ca 5 mi… | — |
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| Dalea formosa Torr. | A. M. Powell 3076 | 02 Apr 1977 | United States of America | Texas | Brewster Co. ca 9 mi… | — |
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| Dalea frutescens A.Gray | A. M. Powell 2454 | 12 Sep 1972 | United States of America | Texas | Brewster Co. ca 13 mi… | — |
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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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| Perityle rupestris (A.Gray) Shinners | A. M. Powell 1555 | 23 Sep 1967 | United States of America | Texas | Brewster Co. rock bluffs, above… | — |
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| Perityle rupestris (A.Gray) Shinners | A. M. Powell 1228 | 06 Jun 1964 | United States of America | Texas | Jeff Davis Co. ca. 2… | — |
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| Perityle rupestris (A.Gray) Shinners | A. M. Powell 1559 | 30 Sep 1967 | United States of America | Texas | Jeff Davis Co. bluffs, 15… | — |
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| Perityle staurophylla (Barneby) Shinners | A. M. Powell 1276 | 28 Aug 1964 | United States of America | New Mexico | Otero Co. ca 1.5 mi.… | — |
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| Perityle tenella (M.E.Jones) J.F.Macbr. | A. M. Powell 1267 | 31 Jul 1964 | United States of America | Utah | Washington Co. ca. 1/2 to… | — |
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| Nerisyrenia linearifolia (S.Watson) Greene | A. M. Powell 2354 | 14 Jun 1972 | United States of America | Texas | Ward Co. ca 6 mi… | — |
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| Draba cuneifolia Nutt. var. cuneifolia | A. M. Powell 1312 | 21 Jan 1965 | United States of America | Texas | Presidio Co. Near spring in… | — |
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| Draba cuneifolia Nutt. | A. M. Powell 6506 | 29 Mar 2005 | United States of America | Texas | Brewster Co. ca 9 mi… | — |
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| Calylophus | A. M. Powell 2359 | 14 Jun 1972 | United States of America | Texas | Ward Co. ca 6 mi… | — |
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| Tiquilia hispidissima (Torr. & A.Gray) A.T.Richardson | A. M. Powell 2355 | 14 Jun 1972 | United States of America | Texas | Ward Co. ca 6 mi… | — |
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| Gaura | A. M. Powell 2360 | 14 Jun 1972 | United States of America | Texas | Ward Co. ca 6 mi… | — |
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| Abronia angustifolia Greene | A. M. Powell 2846 | 10 Jun 1976 | United States of America | Texas | Hudspeth Co. White gypsum dunes,… | — |
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| Mirabilis multiflora (Torr.) A.Gray | A. M. Powell 3004 | 12 Jul 1976 | United States of America | Texas | El Paso Co. south end… | — |
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| Asclepias subverticillata (A.Gray) Vail | A. M. Powell 3002 | 12 Jul 1976 | United States of America | Texas | El Paso Co. south end… | — |
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| Mentzelia humilis (A.Gray) J.Darl. | A. M. Powell 2132 | 23 Jun 1971 | United States of America | Texas | Culberson Co. gyp hills 35… | — |
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| Mentzelia mexicana H.J.Thomps. & Zavort. | A. M. Powell 3026 | 16 Aug 1976 | United States of America | Texas | Brewster Co. roadcut in the… | — |
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| Trianthema portulacastrum L. | A. M. Powell 6001 | 12 Aug 1993 | United States of America | Texas | Presidio Co. Roadside in drainage,… | — |
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| Batesimalva violacea (Rose) Fryxell | A. M. Powell 3632 | 19 Sep 1981 | United States of America | Texas | Brewster Co. Big Bend Nat'l… | — |
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| Opuntia macrocentra Engelm. | A. M. Powell 6022 | 04 Feb 1994 | United States of America | Texas | Presidio Co. Trans-Pecos, ca. 30… | — |
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| Sphaeralcea | A. M. Powell 2353 | 14 Jun 1972 | United States of America | Texas | Ward Co. low gypsum ridges… | — |
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| Amsonia longiflora Torr. | A. M. Powell 2931 | 23 Jun 1976 | United States of America | Texas | Hudspeth Co. Mayfield Canyon, S… | — |
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| Flaveria Juss. | A. M. Powell 2611 | 22 Aug 1973 | Mexico | Coahuila | 39 miles N of San… | — |
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| Forestiera pubescens Nutt. | A. M. Powell 2851 | 11 Jun 1976 | United States of America | Texas | Hudspeth Co. saline-gypsum flats, near… | — |
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| Quercus pungens Liebm. | A. M. Powell 5772 | 12 Oct 1991 | United States of America | Texas | Hudspeth Co. Eagle Mountains, WNW… | — |
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| Melampodium hispidum Kunth | A. M. Powell 1546 | 19 Aug 1967 | United States of America | Texas | Jeff Davis Co. along creek… | — |
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| Flaveria chlorifolia A.Gray | A. M. Powell 2799 | 27 Oct 1974 | United States of America | Texas | Reeves Co. Beside a concrete… | — |
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| Eysenhardtia texana Scheele | A. M. Powell 3007 | 01 Aug 1976 | United States of America | Texas | Val Verde Co. hillsides, ca.… | — |
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| Agropyron Gaertn. | A. M. Powell 5871 | 23 Jul 1992 | United States of America | New Mexico | Otero Co. Near Cloudcroft. | — |
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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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| 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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| 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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