Displaying 1 - 25 out of 453 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Abarema barbouriana var. arenaria (Ducke) Barneby & J.W.Grimes | W. J. Hahn 5396 | 20 Feb 1989 | Guyana | Cuyuni-Mazaruni | N foothills of Roraima, between… | — | 01299563 |
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| Abarema jupunba var. trapezifolia (Vahl) Barneby & J.W.Grimes | W. J. Hahn 3951 | 17 Feb 1988 | Guyana | Demerara-Mahaica | Along Soesdyke-Linden Hwy from Timehri… | — | 01299725 |
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| Acalypha villosa Jacq. | W. J. Hahn 5713 | 14 Mar 1989 | Guyana | Potaro-Siparuni | Approximately 1 km N of… | — | 503668 |
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| Acianthera pubescens (Lindl.) Pridgeon & M.W.Chase | W. J. Hahn 1957 | 05 Feb 1984 | Paraguay | Paraguarí | Parque Nacional Ybycui. | — | 02693717 |
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| Actinostachys pennula (Sw.) Hook. | W. J. Hahn 3956 | 18 Mar 1988 | Guyana | Demerara-Mahaica | Along Soesdyke-Linden Hwy from Timehri… | — | 3882413 |
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| Adiantopsis radiata (L.) Fée | W. J. Hahn 2034 | 09 Feb 1984 | Paraguay | Cordillera | Caacupe | — | 3900105 |
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| Adiantum delicatulum Mart. | W. J. Hahn 1540 | 07 Aug 1983 | Paraguay | — | Chaco, Parque Nacional Defensores del… | — | 3920588 |
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| Adiantum leprieurii Hook. | W. J. Hahn 3677 | 05 Aug 1987 | French Guiana | — | Saul, Carbet Mays. | — | 3920972 |
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| Adiantum leprieurii Hook. | W. J. Hahn 3677 | 05 Aug 1987 | French Guiana | — | Saul, Carbet Mays. | — | 3920974 |
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| Alicia anisopetala (A.Juss.) W.R.Anderson | W. J. Hahn 1073 | 13 Jan 1983 | Paraguay | Paraguarí | Parque Nacional Ybycui | — | 476039 | ||
| Allagoptera leucocalyx (Drude) Kuntze | W. J. Hahn 1605 | 12 Oct 1983 | Paraguay | Alto Paraguay | Chovoreca | — | 02326654 |
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| Allagoptera leucocalyx (Drude) Kuntze | W. J. Hahn 1605 | 12 Oct 1983 | Paraguay | Alto Paraguay | Chovoreca | — | 02326655 |
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| Amphilophium elongatum (Vahl) L.G.Lohmann | W. J. Hahn 5119 | 22 Jan 1989 | Guyana | Cuyuni-Mazaruni | Kartabo, Willems Timber concession. | — | 412301 | ||
| Anaxagorea dolichocarpa Sprague & Sandwith | W. J. Hahn 3565 | 21 Jul 1987 | French Guiana | — | Mount Grand Matoury | — | 378757 | ||
| Aparisthmium cordatum (A.Juss.) Baill. | W. J. Hahn 4206 | 04 Apr 1988 | Guyana | Potaro-Siparuni | Moist forest west of Maikwak | — | 3931798 |
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| Aspidosperma polyneuron Müll.Arg. | W. J. Hahn 1212 | 18 Mar 1983 | Paraguay | Amambay | Parque Nacional Cerro Cora | — | 440285 |
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| Aspidosperma quebracho-blanco Schltdl. | W. J. Hahn 1382 | 4 Jun 1983 | Paraguay | Asuncion | Parque Nacional Tte. Enciso. Km… | — | 4177371 |
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| Asplenium auritum Sw. | W. J. Hahn 5341 | 12 Feb 1989 | Guyana | Cuyuni-Mazaruni | Between camp 1 and 3… | — | 4041421 |
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| Asplenium claussenii Hieron. | W. J. Hahn 753 | 20 Oct 1982 | Paraguay | Paraguarí | Parque Nacional de Ybucuí | — | 4041883 |
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| Asplenium pteropus Kaulf. | W. J. Hahn 4279 | 06 Apr 1988 | Guyana | Potaro-Siparuni | Mt. Kopinang; slopes of mountain. | — | 679373 |
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| Asplenium serratum L. | W. J. Hahn 3674 | 05 Aug 1987 | French Guiana | — | Saul, Carbet Mays. | — | 4045480 |
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| Asplenium serratum L. | W. J. Hahn 3674 | 05 Aug 1987 | French Guiana | — | Saul, Carbet Mays. | — | 4045484 |
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| Aureliana fasciculata var. tomentella (Sendtn.) Hunz. & Barboza | W. J. Hahn 900 | 15 Dec 1982 | Paraguay | Alto Paraná | 23 km N of Hernandarias | — | 04140840 |
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| Austroblechnum lehmannii (Hieron.) Gasper & V.A.O.Dittrich | W. J. Hahn 4339 | 07 Apr 1988 | Guyana | — | Potaro-Siparuni Region: Mt. Kopinang. | — | 04167227 |
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| Baccharis varians Gardner | W. J. Hahn 5709 | 14 Mar 1989 | Guyana | — | Potaro-Siparuni Region: Approximately 3km NE… | — | 788593 |