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The Identity of the Malpighiaceous Narcotics of South America
Vol 18, Iss 1, Page 1
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The Effects of Certain Genes on the Outer Pistillate Glume of Maize
Vol 18, Iss 2, Page 57
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Orchidaceae Neotropicales IV: Notes on the genus Caularthron Raf.
Vol 18, Iss 3, Page 77
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Studies in American Orchids III: A New Genus from the Colombian Amazonia
Vol 18, Iss 3, Page 103
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A New Lepanthopsis from Venezuela
Vol 18, Iss 3, Page 109
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Plantae Austro-Americanae X: Americae Australis Plantae Novae Vel Alia Ratione Significantes
Vol 18, Iss 4, Page 113
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How Absurd Can A Nomenclatural Proposal Be?
Vol 18, Iss 5, Page 181
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Studies in American Orchids IV
Vol 18, Iss 5, Page 186
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Two Additions To the Orchid Flora of Venezuela
Vol 18, Iss 5, Page 219
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A Little-Known Cultivated Plant from Northern South America
Vol 18, Iss 5, Page 229
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New Considerations in an Old Genus: Datura
Vol 18, Iss 6, Page 245
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The Present Distribution of Narcotics and Stimulants amongst the Indian Tribes of Colombia
Vol 18, Iss 6, Page 273
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Plantae Colombianae XV: Plantae Novae Colombianae Orientalis Descriptiones
Vol 18, Iss 6, Page 305
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On the Validity of the Generic Name Cochleanthes Raf
Vol 18, Iss 6, Page 321
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The Origin of Corn: I. Pod Corn, the Ancestral Form
Vol 18, Iss 7, Page 329
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The Origin of Corn: II. Teosinte, a Hybrid of Corn and Tripsacum
Vol 18, Iss 8, Page 357
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The Origin of Corn: III. Modern Races, the Product of Teosinte Introgression
Vol 18, Iss 9, Page 389
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The Origin of Corn: IV. Place and Time of Origin
Vol 18, Iss 10, Page 413
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The Origin of Corn: V. a Critique of Current Theories
Vol 18, Iss 10, Page 428