Displaying 51 - 75 out of 125 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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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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| 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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| Marina parryi (Torr. & A.Gray) Barneby | A. M. Powell 1746 | 23 Mar 1970 | Mexico | Baja California | 24 miles S of Puertecitos | — | ||||
| Melampodium hispidum Kunth | A. M. Powell 1546 | 19 Aug 1967 | United States of America | Texas | Jeff Davis Co. along creek… | — |
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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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| 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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| 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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| Nicolletia trifida Rydb. | A. M. Powell 1739 | 23 Mar 1970 | Mexico | Baja California | 30 mi S of San… | — |
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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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| Palafoxia arida B.L.Turner & M.I.Morris | A. M. Powell 1730 | 23 Mar 1970 | Mexico | Baja California | 16 mi S San Felipe | — | ||||
| Palafoxia arida B.L.Turner & M.I.Morris | A. M. Powell 1705 | 22 Mar 1970 | Mexico | Baja California | 41.6 miles S of Mexicali | — | ||||
| Palafoxia arida B.L.Turner & M.I.Morris | A. M. Powell 1818 | 27 Mar 1970 | Mexico | Baja California Sur | 25 mi S of El… | — | ||||
| Penstemon ambiguus Torr. | A. M. Powell 2848 | 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 crassifolia (Brandegee) var. crassifolia | A. M. Powell 1849 | 31 Mar 1970 | Mexico | Baja California Sur | La Paz Mun. Punta Arena,… | — | ||||
| 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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| 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 1695 | 02 Apr 1969 | United States of America | Arizona | Pima Co. Just NW of… | — |
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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 (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 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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