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Novelties in the Orchid Flora of the Guayana Highlands II
Vol 20, Iss 1, Page 1
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The Hallucinogenic Mushrooms of Mexico and Psilocybin: a Bibliography
Vol 20, Iss 2, Page 25
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A New Species of Salvia from Mexico
Vol 20, Iss 3, Page 75
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A New Mexican Psychotropic Drug from the Mint Family
Vol 20, Iss 3, Page 77
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Resia--A New Genus of Gesneriaceae
Vol 20, Iss 3, Page 85
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New Orchids from Ceylon
Vol 20, Iss 4, Page 93
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Spread of Eight-Rowed Maize from the Prehistoric Southwest
Vol 20, Iss 5, Page 117
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Notes on the Present Status of Ololiuhqui and the Other Hallucinogens of Mexico
Vol 20, Iss 6, Page 161
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The Active Principles of the Seeds of Rivea corymbosa and Ipomoea violacea
Vol 20, Iss 6, Page 194
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A New Gossypium from the Cape Verde Islands
Vol 20, Iss 7, Page 213
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Plantae Colombianae XVI: Saurauiae Provinciae Putumayonis Species Nova
Vol 20, Iss 7, Page 221
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Present Status of Botanical Studies of Ambers
Vol 20, Iss 8, Page 225
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Tripsacum as a Possible Amphidiploid of Wild Maize and Manisuris
Vol 20, Iss 9, Page 289
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Plantae Colombianae XVII: De Plantis Regionis Amazonicae Notae
Vol 20, Iss 9, Page 317
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Philoglossa--A Cultivar of the Sibundoy of Colombia
Vol 20, Iss 10, Page 325
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Louis C. Bierweiler: An Appreciation
Vol 20, Iss 10, Page 334
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Plantae Colombianae XVIII. Plantarum utilium Speciei Duae Novae
Vol 20, Iss 10, Page 336