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Five novelties in the Verbenaceae
Volume 18, Page 70
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Notes on Bromeliaceae, XXIX
Volume 18, Page 137
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Mimosa bahamensis, a Bahama-Yucatan disjunct
Volume 18, Page 143
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New tree species from Esmeraldas, Ecuador
Volume 18, Page 195
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Notes on Neotropical Euphorbiaceae 4. Monograph of the genus Actinostemon
Volume 18, Page 213
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Additional notes on the Eriocaulaceae. XX
Volume 18, Page 241
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Additional notes on the Eriocaulaceae. XXI
Volume 18, Page 295
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Ormosia schunkei, another new species from Peru
Volume 18, Page 337
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Additional notes on the Eriocaulaceae. XXII
Volume 18, Page 344
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Psilopilum mexicanum sp. nov
Volume 18, Page 401
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New tree species from Esmeraldas, Ecuador (Continued)
Volume 18, Page 404
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New tree species from Esmeraldas, Ecuador (Continued)
Volume 18, Page 457
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A synopsis of the genus Piscidia (Leguminosae)
Volume 18, Page 473