Displaying 1 - 25 out of 69 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Tridax mexicana A.M.Powell | A. M. Powell 757 | 18 Aug 1961 | Mexico | Guerrero | Acapulco, east side of city | isotype | 274222 |
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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 | 231077 |
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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… | — | 24061 |
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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 | 169329 |
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| Penstemon ambiguus Torr. | A. M. Powell 2848 | 10 Jun 1976 | United States of America | Texas | Hudspeth Co. White gypsum dunes,… | — | 569751 |
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| Selinocarpus gypsophilus B.A.Fowler | A. M. Powell 2105 | 25 May 1971 | Mexico | Chihuahua | Ca. 15 miles southwest of… | isotype | 342152 |
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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 | 231047 |
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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 | 231040 |
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| Layia glandulosa (Hook.) Hook. & Arn. | A. M. Powell 1806 | 26 Mar 1970 | Mexico | Baja California | About 10 mi NE of… | — | 423164 |
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| Flaveria oppositifolia (DC.) Rydb. | A. M. Powell 2710 | 21 May 1974 | Mexico | Coahuila | 3 mi NW of Nadadores | — | 417809 |
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| Dalea formosa Torr. | A. M. Powell 3070 | 25 Mar 1977 | United States of America | Texas | Val Verde Co. Langtry. | — | 01269570 |
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| Dalea formosa Torr. | A. M. Powell 3071 | 25 Mar 1977 | United States of America | Texas | Terrell Co. hills 3 mi… | — | 01269571 |
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| Dalea formosa Torr. | A. M. Powell 3067 | 21 Mar 1977 | United States of America | Texas | Terrell Co. 12 mi E… | — | 01269574 |
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| Dalea formosa Torr. | A. M. Powell 1561 | 10 Apr 1968 | United States of America | Texas | Hudspeth Co. ca 5 mi… | — | 01269622 |
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| Dalea formosa Torr. | A. M. Powell 3076 | 02 Apr 1977 | United States of America | Texas | Brewster Co. ca 9 mi… | — | 01269625 |
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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… | — | 01269678 |
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| Calycoseris wrightii A.Gray | A. M. Powell 1761 | 24 March 1970 | Mexico | Baja California | 18 miles S of Bahia… | — | 2030701 |
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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 | 02497211 |
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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… | — | 3128149 |
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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… | — | 3128168 |
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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… | — | 3128169 |
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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.… | — | 03128214 |
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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… | — | 3128226 |
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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… | — | 3187910 |
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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… | — | 3200968 |
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