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A Synopsis of the North American Species of Sorbus
Vol 20, Iss 1, Page 1
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Studies in the Lauraceae. II. Some Critical and New Species of Cinnamomum and Neocinnamomum
Vol 20, Iss 1, Page 44
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New and Noteworthy Species of Asiatic Jasminum
Vol 20, Iss 1, Page 64
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Botanical Results of the Archbold Expeditions New Guinea Records of Annonaceae and Menispermaceae
Vol 20, Iss 1, Page 73
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Botanical Results of the Archbold Expeditions New and Noteworthy Papuan Scrophulariaceae. II
Vol 20, Iss 1, Page 75
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New Species, Varieties and Combinations from the Collections of the Arnold Arboretum
Vol 20, Iss 1, Page 85
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Additional Notes on Chinese Myrtaceae
Vol 20, Iss 1, Page 102
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A Review and Extension of Our Knowledge of Calyptospora goeppertiana Kuehn
Vol 20, Iss 1, Page 104
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Thyronectria denigrata (Winter) Seaver, the Cause of Disease in Gleditsia
Vol 20, Iss 1, Page 114
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The Vegetative Propagation of Difficult Plants
Vol 20, Iss 1, Page 116
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Bibliographical Note on "Ehrh. Plantag."
Vol 20, Iss 1, Page 137
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Note: VII. International Botanical Congress, Stockholm, 1940
Vol 20, Iss 1, Page 138
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On the Brass Collections of Pandanaceae from New Guinea
Vol 20, Iss 2, Page 139
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Palmae Gesammelt in Neu Guinea Von L. J. Brass
Vol 20, Iss 2, Page 187
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New Cyperaceae from New Guinea
Vol 20, Iss 2, Page 213
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New Ixora Species from the Solomon Islands
Vol 20, Iss 2, Page 216
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New Records of Styrax and Casuarina from the Solomon Islands
Vol 20, Iss 2, Page 220
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Two New Species of Opposite-Leaved Ilex from Borneo
Vol 20, Iss 2, Page 222
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Preliminary Notes on Asiatic-Polynesian Species of Erythrina
Vol 20, Iss 2, Page 225
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New Phanerogams from Mexico
Vol 20, Iss 2, Page 234
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New Fuchsias from Southern Peru
Vol 20, Iss 2, Page 241
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Dos Especies Nuevas Para El Norte De Chile
Vol 20, Iss 2, Page 245
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Clymenia and Burkillanthus, New Genera Also Three New Species of Pleiospermium (Rutaceae-Aurantioideae)
Vol 20, Iss 2, Page 250
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Additional Notes on Houttuyn's Binomials
Vol 20, Iss 2, Page 264
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Proposed amendments to the international rules of botanical nomenclature
Vol 20, Iss 2, Page 269
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The firs of Mexico and Guatemala
Vol 20, Iss 3, Page 281
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Plantae Krukovianae VI
Vol 20, Iss 3, Page 288
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Papuan grasses collected by L. J. Brass, II
Vol 20, Iss 3, Page 304
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Combretaceae of the 1936 Archbold Expedition (Fly River, British New Guinea)
Vol 20, Iss 3, Page 317
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Enumeration of the Araliaceae Collected by L.J. Brass in New Guinea
Vol 20, Iss 3, Page 321
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Plantae Papuanae Archboldianae. I.
Vol 20, Iss 3, Page 324
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Records of Indo-Chinese Plants
Vol 20, Iss 3, Page 346
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On Certain Malaysian Species of Meliosma Blume
Vol 20, Iss 3, Page 356
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Studies in Theaceae. IV. New and Noteworthy Species of Eurya
Vol 20, Iss 3, Page 361
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Studies in the Boraginaceae, XIII. New or otherwise noteworthy species chiefly from western United States
Vol 20, Iss 3, Page 375
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Further Notes on Jasminum
Vol 20, Iss 4, Page 403
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New Species, Varieties and Combinations from the Collections of the Arnold Arboretum
Vol 20, Iss 4, Page 409
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Einige Neue Cunoniaceen aus Neuguinea
Vol 20, Iss 4, Page 432
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Notes on Chinese Bauhinia with Description of Three New Species
Vol 20, Iss 4, Page 437
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Notes on Photinia
Vol 20, Iss 4, Page 440
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Polygonanthus, not a Genus of the Saxifragaceae
Vol 20, Iss 4, Page 443
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The Arnold Arboretum during the fiscal year ended June 30, 1939
Vol 20, Page 446
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Corrections
Vol 20, Iss 4, Page 464
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Index [vol. 20]
Vol 20, Iss 4, Page 465