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Additional notes on the Eriocaulaceae. XXX
Volume 20, Page 4
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Notes on Bromeliaceae. XXXI. Key to Tillandsia and simulators
Volume 20, Page 121
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A revision of the moss genus, Trichostomopsis
Volume 20, Page 184
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Studies in the Eupatorieae (Compositae)---XXIX. The genus Chromolaena
Volume 20, Page 196
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Studies in the Eupatorieae (Compositae)---XXXI. A new genus Polyanthina
Volume 20, Page 213
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Miscellaneous additions and revisions to the Flowering Plants of Jamaica
Volume 20, Page 309
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Notes on the moss genera Camptochaete, Physcomitrium and Ptychomnion in Chile
Volume 20, Page 329
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Studies in the Eupatorieae (Compositae). XXXII. A new genus, Neocuatrecasia
Volume 20, Page 332
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South American Species of Stomatanthes (Eupatorieae, Compositae)
Volume 20, Page 334
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Certamen Melastomataceis XV
Volume 20, Page 369
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Notes on Myrsinaceae. I. Generic assignment of Conomorpha sodiroana Mez, Ardisia ambigua Mart., and related species
Volume 20, Page 401
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Etaballia dubia (Leguminosae), a new combination
Volume 20, Page 426
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Names of New World cypresses (Cupressus)
Volume 20, Page 429
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Notes on the flowering plants of Muturajawela
Volume 20, Page 452
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Miscellaneous notes on Neotropical flora
Volume 20, Page 465
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Additional materials toward a monograph of the genus Callicarpa. XI
Volume 20, Page 482