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Studies in New World Moraceae: Trophis, Clarisia, Acanthinophyllum
Vol 49, Page 1, Date 1962
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Pollination and Variation in the Subtribe Catasetinae (Orchidaceae)
Vol 49, Page 35, Date 1962
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The Floral Morphology of Secamone and the Evolution of the Pollinating Apparatus in Asclepiadaceae
Vol 49, Page 95, Date 1962
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Flora of Panama. Part IV. Fascicle V
Vol 49, Page 137, Date 1962