Displaying 1 - 50 out of 601 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Acacia demostachya Benth. | K. T. Hartweg 75 | 1836-1839 | Mexico | Guanajuato | León | isotype | 1466 |
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| Acacia demostachya Benth. | K. T. Hartweg 75 | 1836-1839 | Mexico | Guanajuato | León | isotype | 1467 |
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| Acacia hartwegi Benthem | K. T. Hartweg 74 | 1839 | Mexico | — | isotype | 1475 |
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| Acalypha microstachya Benth. | K. T. Hartweg 512 | 1841 | Mexico | Oaxaca | Prope Rancho del Ojo de… | isotype | 246038 |
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| Acalypha ulmifolia Benth. | K. T. Hartweg 1387 | — | Colombia | — | Prope Popayan | isotype | 246140 |
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| Acerates cordifolia Benth. | K. T. Hartweg | s.d. | United States of America | California | Sacramento Co. | isotype | 318451 |
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| Acerates humilis Benth. | K. T. Hartweg s.n. | — | Mexico | Guanajuato | Prope León. | isolectotype | 4809 |
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| Achillea millefolium L. | K. T. Hartweg 1801 | s.d. | United States of America | California | Monterey | — | 1824747 |
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| Achimenes longiflora DC. | K. T. Hartweg 604 | s.d. | Guatemala | — | In praeruptes prope Guatemaala | not a type | 312491 |
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| Achimenes patens Benth. | K. T. Hartweg 353 | s.d. | Mexico | — | Mexico, in umbrosis inter Tiacuaro… | isotype | 312494 |
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| Achimenes pedunculata Benth. | K. T. Hartweg 546 | s.d. | Mexico | — | Mexico, in sylvis umbrosis prope… | isotype | 312495 |
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| Achimenes picta Benth. | K. T. Hartweg 1263 | s.d. | Colombia | — | In umbrosis ad hacienda de… | isotype | 312503 |
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| Achyrocline candicans DC. | K. T. Hartweg 1149 | s.d. | Colombia | — | possible type | 149881 |
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| Achyrocline rufescens (Kunth) DC. | K. T. Hartweg 1150 | — | Colombia | — | — | 663831 | |||
| Acrostichum hartwegii Fée | K. T. Hartweg 1486 | s.d. | Colombia | — | isotype fragment | 149628 |
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| Acrostichum hartwegii Fée | K. T. Hartweg 1486 | s.d. | Colombia | — | isotype fragment | 149629 |
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| Acrostichum heteromorphum Klotzsch | K. T. Hartweg 1525 | 1843 | Colombia | — | isotype | 149634 |
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| Adenostemma hirtiflorum Benth. | K. T. Hartweg 531 | 1841 | Mexico | — | Rancho de Santa Rita prope… | isotype | 158076 |
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| Alsophila elongata Hook. | K. T. Hartweg 1528 | s.d. | Colombia | — | isolectotype | 148665 |
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| Alstonia ciliata Benth. | K. T. Hartweg 366 | s.d. | Mexico | — | In loco "Banco" dicto | type | 334854 |
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| Ambrosia fruticosa var. canescens Benth. | K. T. Hartweg 121 | s.d. | Mexico | Aguascalientes | In arvis communis Aguas Calientes | isotype | 158164 |
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| Ambrosia fruticosa var. canescens Benth. | K. T. Hartweg 121 | s.d. | Mexico | Aguascalientes | In arvis communis Aguas Calientes | isotype | 158165 |
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| Andrieuxia quitensis Benth. | K. T. Hartweg 1142 | s.d. | Colombia | — | isotype | 158193 |
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| Andropogon benthamianus Steud. | K. T. Hartweg 1460 | s.d. | Ecuador | — | Colombia: Ad Hacienda de Travim… | isotype | 274706 |
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| Antennaria argentea Benth. | K. T. Hartweg 1810 | s.d. | United States of America | California | Sacramento | isotype | 23059 |
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| Anticlea fremontii Torr. | K. T. Hartweg 2009 | s.d. | United States of America | California | Monterey Co. | holotype | 247950 |
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| Antigonon platypus Hook. & Arn. | K. T. Hartweg s.n. | s.d. | Mexico | — | — | 1288255 | |||
| Antirrhinum cornutum Benth. | K. T. Hartweg 1888 | s.d. | United States of America | California | Sacramento Co. | isotype | 67841 |
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| Arbutus tessellata P.D.Sørensen | K. T. Hartweg 90 | 1839 | Mexico | — | — | 1874924 |
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| Arbutus varians Benth. | K. T. Hartweg 542 | 1841 | Guatemala | Quetzaltenango | In montibus prope Quetzaltenango | type | 8220 |
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| Arbutus xalapensis var. pubescens Benth. | K. T. Hartweg 485 | 1841 | Mexico | Oaxaca | In montibus Carmen. | isotype | 8221 |
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| Arctostaphylos longifolia Benth. | K. T. Hartweg 338 | 1840 | Mexico | — | Angangueo | isotype | 9771 |
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| Arctostaphylos pungens Kunth | K. T. Hartweg 91 | 1839 | Mexico | — | — | 1875188 |
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| Aristolochia gibbosa Duch. | K. T. Hartweg 566 | — | Guatemala | — | San Antonio; Pretaleu (?illegible) | type | 285530 |
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| Arnica discoidea Benth. | K. T. Hartweg 1805 | s.d. | United States of America | California | Monterey Co. Monterey | isotype | 158409 |
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| Asclepias eriocarpa Benth. | K. T. Hartweg | s.d. | United States of America | California | Monterey Co. | isotype | 318480 |
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| Asclepias pratensis Benth. | K. T. Hartweg 345 | 1838 | Mexico | Michoacán | In pratis humidis, Morelia | isotype | 4807 |
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| Asclepias pratensis Benth. | K. T. Hartweg 345 | 1838 | Mexico | Michoacán | Morelia | isotype | 1085611 |
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| Asclepias setosa Benth. | K. T. Hartweg 213 | 1839 | Mexico | Aguascalientes | Aguascalientes Mun. | type | 4641 |
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| Asplenium monanthes L. | K. T. Hartweg 1532 | 1843 | Colombia | — | — | 4042886 |
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| Asplenium praemorsum Sw. | K. T. Hartweg 1524 | s.d. | Colombia | — | — | 4043244 |
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| Astrogyne crotonoides Benth. | K. T. Hartweg 83 | 1839 | Mexico | — | isotype | 246264 |
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| Baccharis asperifolia Benth. | K. T. Hartweg 589 | s.d. | Mexico | — | In montibus Mexico-Guatemala | isotype | 162181 |
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| Baccharis balsamifera Benth. | K. T. Hartweg 1121 | s.d. | Colombia | — | isotype | 162179 |
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| Baccharis ilinissae Benth. | K. T. Hartweg 1114 | s.d. | Colombia | — | Ad nives aeternas montis Ilinilsa | isotype | 162253 |
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| Baccharis loxensis Benth. | K. T. Hartweg 761 | s.d. | Peru | — | In montibus Loxa | isotype | 162262 |
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| Baccharis loxensis Benth. | K. T. Hartweg 761 | s.d. | Peru | — | In montibus Loxa | isotype | 162261 |
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| Baccharis marcetiifolia Benth. | K. T. Hartweg 1118 | s.d. | Colombia | — | isotype | 162272 |
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| Baccharis marcetiifolia Benth. | K. T. Hartweg 1118 | s.d. | Colombia | — | isotype | 162273 |
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| Baccharis ustulata Benth. | K. T. Hartweg 1120 | s.d. | Colombia | — | isotype | 162405 |
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