Displaying 1 - 25 out of 716 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Abelmoschus moschatus Medik. | J. R. Johnston 125 | 18 Feb 1912 | Puerto Rico | San Juan | Río Piedras. | — |
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| Acalypha chamaedrifolia (Lam.) Müll.Arg. | J. R. Johnston 587 | 2 Sep 1912 | Puerto Rico | San Juan | Rio Piedras | — |
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| Acalypha setosa A.Rich. | J. R. Johnston 947 | 17 Aug 1913 | Puerto Rico | Ciales | — |
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| Acisanthera erecta Gleason | J. R. Johnston 862 | 26 Jul 1913 | Puerto Rico | — | Río Piedras. Dorado. | — |
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| Adiantopsis radiata (L.) Fée | J. R. Johnston 108 | 22 Jun 1903 | Trinidad and Tobago | — | Trinidad. Fort St. Georges Hill | — |
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| Adiantopsis radiata (L.) Fée | J. R. Johnston 184 | 06 Jul 1903 | Venezuela | — | The Island of Margarita. San… | — |
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| Adiantum petiolatum Desv. | J. R. Johnston 232 | 21 Apr 1912 | Puerto Rico | San Juan | Río Piedras. | — |
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| Adiantum tetraphyllum Humb. & Bonpl. ex Willd. | J. R. Johnston 162 | 16 Jul 1903 | Venezuela | — | The Island of Margarita. | — |
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| Aecidium abscedens Arthur | J. R. Johnston s.n. | 25 Apr 1914 | Puerto Rico | — | Río Piedras. Martin Peña, Randia… | — |
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| Aegiphila martinicensis Jacq. | J. R. Johnston 1073 | 23 Nov 1913 | Puerto Rico | San Juan | Martín Peña. | — |
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| Aegiphila martinicensis Jacq. | J. R. Johnston 669 | 22 Sep 1912 | Puerto Rico | San Juan | Río Piedras. | — |
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| Aegiphila martinicensis var. oligoneura (Urb.) Moldenke | J. R. Johnston 703 | 24 Nov 1912 | Puerto Rico | San Juan | Río Piedras. | — |
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| Aeschynomene portoricensis Urb. | J. R. Johnston 520 | 20 Jul 1912 | Puerto Rico | San Juan | Río Piedras | — |
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| Aeschynomene sensitiva Sw. var. sensitiva | J. R. Johnston 175 | 10 Mar 1962 | Puerto Rico | San Juan | Río Piedras. | — |
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| Aeschynomene villosa Poir. | J. R. Johnston 59 | 29 Jun 1912 | Puerto Rico | San Juan | Río Piedras. | — |
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| Agalinis fasciculata (Elliott) Raf. | J. R. Johnston 194 | 05 Apr 1912 | Puerto Rico | — | Rio Piedras | — |
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| Agaricus johnstonii Murrill | J. R. Johnston 135 | 25 Dec 1911 | Puerto Rico | — | Rio Piedras. | paratype |
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| Agaricus johnstonii Murrill | J. R. Johnston 1945 | 11 Jun 1914 | Puerto Rico | — | Rio Piedras. | holotype |
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| Ageratum conyzoides L. subsp. conyzoides | J. R. Johnston 132 | 18 Feb 1912 | Puerto Rico | — | Río Piedras. | — |
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| Albugo | J. R. Johnston s.n. | 25 Dec 1913 | Puerto Rico | — | Rio Piedras | — | ||||
| Albugo bliti (Biv.) J.E.Kuntze | J. R. Johnston 455 | 23 Jun 1912 | Puerto Rico | — | Rio Pedras | — |
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| Albugo candida (Pers.) Roussel | J. R. Johnston 1186 | 25 Dec 1913 | Puerto Rico | — | Rio Piedras | — |
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| Albugo ipomoaea-panduratae (C.Schweinf.) D.B.Swingle | J. R. Johnston 1367 | 14 Feb 1914 | Puerto Rico | — | Cataño | — |
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| Allamanda cathartica L. | J. R. Johnston 445 | Jun 1912 | Puerto Rico | — | Near Carolina. | — |
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| Allotoonia agglutinata (Jacq.) J.F.Morales & J.K.Williams | J. R. Johnston 2054 | 29 Jun 1914 | Puerto Rico | Moca | Río Piedras | — |
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