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Viable Soil Algae from the Herbarium of the Missouri Botanical Garden
Vol 56, Page 113, Date 1969
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Scanning Electron Microscopy as an Aid to Pollen Taxonomy
Vol 56, Page 121, Date 1969
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On Tropical Tree Seedlings I. Seeds, Seedlings, Systems, and Systematics
Vol 56, Page 125, Date 1969
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The Genus Cienfuegosia Cav. (Malvaceae)
Vol 56, Page 179, Date 1969
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Cytological and Chromatographic Evidence for Interspecific Hybridization in Petalostemon
Vol 56, Page 261, Date 1969
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Studies in Neotropical Paleobotany. I. The Oligocene Communities of Puerto Rico
Vol 56, Page 308, Date 1969
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The California Islands
Vol 56, Page 391, Date 1969
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Vegetation of a Galapagos Island Before and After an Ice Age
Vol 56, Page 419, Date 1969
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Pollen Morphology of Saprophytic Taxa in the Gentianaceae
Vol 56, Page 420, Date 1969
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Cytotaxonomic Notes on Some Neotropical Gentianaceae
Vol 56, Iss 3, Page 439, Date 1969
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Spores of the Heterophyllous Selaginellae of Mexico and Central America
Vol 56, Page 444, Date 1969
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The Ozark Flora-Some Collections of Note
Vol 56, Page 465, Date 1969
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Chromosome Numbers of Phanerogams. 3
Vol 56, Page 471, Date 1969
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Some New Combinations in Protium (Burseraceae)
Vol 56, Page 475, Date 1969